Manual de Fallas MBE4000 PDF

DDEC VI MBE 4000 TROUBLESHOOTING GUIDE
ENGINE EXHAUST
Consider the following before servicing engines:
PERSONAL INJURY
Diesel engine exhaust and some of its constituents are
known to the State of California to cause cancer, birth
defects, and other reproductive harm.
Always start and operate an engine in a well ventilated
area.
If operating an engine in an enclosed area, vent the
exhaust to the outside.
Do not modify or tamper with the exhaust system or
emission control system.
HOT EXHAUST
During stationary regeneration the exhaust gases will
be extremely HOT and could cause a fire if directed at
combustible materials. Ensure that the vehicle is in a well
ventilated area and do not park where the exhaust will
discharge in a manner that could create a fire.
TRADEMARK INFORMATION
DDC, Detroit Diesel, DDEC, Diagnostic Link, Optimized Idle, Optimized Idle,
Pro-Link, and Series 60 are registered trademarks of Detroit Diesel Corporation. All other
trademarks used are the property of their respective owners.
All information subject to change without notice. (Rev. )

6SE568 Copyright PRELIMINARY 2007 DETROIT DIESEL CORPORATION i
MCM/CPC WARNING
Figure 1 MCM/CPC Replacement Warning
SOFTWARE UPGRADES
NOTE:
These engines are equipped with DaimlerChrysler software. This software generally
assures optimal engine performance. The installation of software upgrades may cause
minor changes in features and engine performance.
ABSTRACT
This manual provides instruction for troubleshooting the 2007 Electronic Controls engines.
Specifically covered in this manual are troubleshooting and repair steps that apply to DDEC VI.
SAFETY INSTRUCTIONS
To reduce the chance of personal injury and/or property damage, the instructions contained in this
Troubleshooting Manual must be carefully observed. Proper service and repair are important to
the safety of the service technician and the safe, reliable operation of the engine.
If part replacement is necessary, the part must be replaced with one of the same part number or
with an equivalent part number. Do not use a replacement part of lesser quality. The service
procedures recommended and described in this manual are effective methods of performing
repair. Some of these procedures require the use of specially designed tools. Accordingly, anyone
who intends to use a replacement part, procedure or tool which is not recommended, must first
determine that neither personal safety nor the safe operation of the engine will be jeopardized by
the replacement part, procedure or tool selected.
(Rev. ) All information subject to change without notice.

ii 6SE568 Copyright PRELIMINARY 2007 DETROIT DIESEL CORPORATION
It is important to note that this manual contains various "Cautions" and "Notices" that must be
carefully observed in order to reduce the risk of personal injury during repair, or the possibility
that improper repair may damage the engine or render it unsafe. It is also important to understand
that these "Cautions" and "Notices" are not exhaustive, because it is impossible to warn personnel
of the possible hazardous consequences that might result from failure to follow these instructions.
A LETTER TO THE TECHNICIANS
Technicians today are required to have computer skills, excellent comprehension of the written
word and possess an extensive diagnostic understanding of the various technological systems and
components. Technicians today must perform at a higher level of efficiency and competency than
their predecessors and at the same time furnish professional quality support.
As the leader in engine computer systems and technology, Detroit Diesel Corporation remains
focused on providing excellence in products, service support and training. As products become
more and more advanced, technicians must become specialized in multiple areas. This manual is
designed with that thought in mind. The DDEC VI MBE900 and MBE4000 Troubleshooting
Guide will provide you with concentrated information that will allow you to excel in DDEC VI
technology.

6SE568 Copyright PRELIMINARY 2007 DETROIT DIESEL CORPORATION iii
REVISION NOTIFICATION
Modifications to this manual are announced in the form of Service Information Bulletins. The
bulletins include attachment pages and are posted on the DDC extranet.
Revisions to this manual will be sent marked with a revision bar (see Example 2). Sections
containing revisions will have added information in the page footer (compare Examples 1 and 2).

iv 6SE568 Copyright PRELIMINARY 2007 DETROIT DIESEL CORPORATION
TABLE OF CONTENTS
1 INTRODUCTION
1.1 OVERVIEW .............................................................................................. 1-3
1.2 SCOPE AND USE OF THIS GUIDE ........................................................ 1-4
1.3 SAFETY PRECAUTIONS ........................................................................ 1-6
2 DDEC VI SYSTEM
2.1 DDEC VI SYSTEM--HOW IT WORKS ..................................................... 2-3
2.2 MOTOR CONTROL MODULE ................................................................ 2-4
2.3 COMMON POWERTRAIN CONTROLLER ............................................. 2-13
2.4 WIRES AND WIRING .............................................................................. 2-25
2.5 CONDUIT AND LOOM ............................................................................. 2-39
2.6 TAPE AND TAPING ................................................................................. 2-40
2.7 SENSORS ................................................................................................ 2-41
2.8 INSTRUMENT PANEL LAMPS ................................................................ 2-54
3 SPN 27 - EGR VALVE POSITION CIRCUIT FAULT
3.1 SPN 27/FMI 3 ........................................................................................... 3-3
3.2 SPN 27/FMI 4 ........................................................................................... 3-4
3.3 SPN 27/FMI 0/1/2/14 ............................................................................... 3-5
4 SPN 84 VEHICLE SPEED SENSOR
4.1 SPN 84/FMI 3 ........................................................................................... 4-3
4.2 SPN 84/FMI 4 ........................................................................................... 4-4
5 SPN 86 ADAPTIVE CRUISE CONTROL FAULT
5.1 SPN 86/FMI 14 ......................................................................................... 5-3
6 SPN 91 ACCELERATOR PEDAL SENSOR FAULT
6.1 SPN 91/FMI 2 ........................................................................................... 6-3
6.2 SPN 91/FMI 3 ........................................................................................... 6-4
6.3 SPN 91/FMI 4 ........................................................................................... 6-6
7 SPN 100 ENGINE OIL PRESSURE OUTSIDE NORMAL OPERATING
RANGE
7.1 SPN 100/FMI 1 ......................................................................................... 7-3
7.2 SPN 100/FMI 2 ......................................................................................... 7-5
7.3 SPN 100/FMI 3 ......................................................................................... 7-6
7.4 SPN 100/FMI 4 ......................................................................................... 7-8
7.5 SPN 100/FMI 14 ....................................................................................... 7-10
8 SPN 103 TURBO NO REVOLUTION
8.1 SPN 103/FMI 0 ......................................................................................... 8-3
8.2 SPN 103/FMI 1 ......................................................................................... 8-4
8.3 SPN 103/FMI 3 ......................................................................................... 8-5
8.4 SPN 103/FMI 4 ......................................................................................... 8-7
8.5 SPN 103/FMI 7 ......................................................................................... 8-9

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9 SPN 110 COOLANT TEMPERATURE ABOVE OR BELOW NORMAL

OPERATING RANGE
9.1 SPN 110/FMI 0 ......................................................................................... 9-3
9.2 SPN 110/FMI 2 ......................................................................................... 9-4
9.3 SPN 110/FMI 3 ........................................................................................ 9-5
9.4 SPN 110/FMI 4 ......................................................................................... 9-7
9.5 SPN 110/FMI 14 ....................................................................................... 9-9
10 SPN 111 COOLANT LEVEL OUTSIDE NORMAL OPERATING
RANGE
10.1 SPN 111/FMI 1 ......................................................................................... 10-5
10.2 SPN 111/FMI 3 ......................................................................................... 10-7
10.3 SPN 111/FMI 4 ......................................................................................... 10-9
11 SPN 158 BATTERY CHARGING FAULT
11.1 SPN 158/FMI 0 ......................................................................................... 11-3
11.2 SPN 158/FMI 1 ......................................................................................... 11-4
11.3 SPN 158/FMI 2 ......................................................................................... 11-6
12 SPN 168 BATTERY VOLTAGE OUTSIDE NORMAL OPERATING
RANGE
12.1 SPN 168/FMI 0 ......................................................................................... 12-3
12.2 SPN 168/FMI 1 ......................................................................................... 12-4
13 SPN 174 SUPPLY FUEL TEMPERATURE FAULT
13.1 SPN 174/FMI 3 ......................................................................................... 13-3
13.2 SPN 174/FMI 4 ......................................................................................... 13-5
14 SPN 175 ENGINE OIL TEMPERATURE OUTSIDE NORMAL RANGE
14.1 SPN 175/FMI 2 ......................................................................................... 14-3
14.2 SPN 175/FMI 3 ......................................................................................... 14-5
14.3 SPN 175/FMI 4 ......................................................................................... 14-7
15 SPN 411 EGR DIFFERENTIAL PRESSURE OR DELTA P SENSOR
CIRCUIT OUTSIDE OF NORMAL OPERATING RANGE
15.1 SPN 411/FMI 0 ......................................................................................... 15-3
15.2 SPN 411/FMI 1 ......................................................................................... 15-5
15.3 SPN 411/FMI 3 ......................................................................................... 15-6
15.4 SPN 411/FMI 4 ......................................................................................... 15-7
16 SPN 558 - IDLE VALIDATION SWITCH
16.1 SPN 558/FMI 1 ......................................................................................... 16-3
16.2 SPN 558/FMI 3 ......................................................................................... 16-3
16.3 SPN 558/FMI 4 ......................................................................................... 16-5
17 SPN 599 - CRUISE CONTROL SWITCHES NOT FUNCTIONING
PROPERLY
17.1 SPN 599/FMI 12 ....................................................................................... 17-3

vi 6SE568 Copyright PRELIMINARY 2007 DETROIT DIESEL CORPORATION
18 SPN 601 - CRUISE CONTROL SWITCHES NOT FUNCTIONING

PROPERLY
18.1 SPN 601/FMI 12 ....................................................................................... 18-3
19 SPN 609 - MCM FAULT (ERRONEOUS DATA)
19.1 SPN 609/FMI 12 ....................................................................................... 19-3
19.2 SPN 609/FMI 14 ....................................................................................... 19-4
20 SPN 615 - ELECTROSTATIC OIL SEPARATOR OUTSIDE OF NORMAL
OPERATING RANGE
20.1 SPN 615/FMI 3 ......................................................................................... 20-3
20.2 SPN 615/FMI 4 ......................................................................................... 20-4
21 SPN 615 - INTAKE AIR DELTA PRESSURE OUTSIDE OF NORMAL
OPERATING RANGE
21.1 SPN 615/FMI 3 ......................................................................................... 21-3
21.2 SPN 615/FMI 4 ......................................................................................... 21-5
22 SPN 625 - CAN FAULT
22.1 SPN 625/FMI 2, 9, 10, 13, 14 ................................................................... 22-3
22.2 SPN 625/FMI 4 ......................................................................................... 22-5
23 SPN 636 CRANKSHAFT POSITION SENSOR OUTSIDE OF
NORMAL OPERATING CONDITIONS
23.1 SPN 636/FMI 1 ......................................................................................... 23-3
23.2 SPN 636/FMI 3 ......................................................................................... 23-5
23.3 SPN 636/FMI 4 ......................................................................................... 23-7
23.4 SPN 636/FMI 7 ......................................................................................... 23-9
23.5 SPN 636/FMI 8 ......................................................................................... 23-10
24 SPN 651 INJECTOR #1 NOT OPERATING NORMALLY
24.1 SPN 651/FMI 5 ......................................................................................... 24-3
24.2 SPN 651/FMI 10 ....................................................................................... 24-5
25.1 SPN 652/FMI 5 ......................................................................................... 25-3
25.2 SPN 652/FMI 10 ....................................................................................... 25-5
26.1 TROUBLESHOOTING SPN 653/FMI 5 ................................................... 26-3
26.2 TROUBLESHOOTING SPN 653/FMI 10 ................................................. 26-5
28.1 SPN 655/FMI 5 ......................................................................................... 28-3
28.2 SPN 655/FMI 10 ....................................................................................... 28-5
29.1 SPN 656/FMI 5 ......................................................................................... 29-3

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29.2 SPN 656/FMI 10 ....................................................................................... 29-5

30 SPN 701 - CONSTANT THROTTLE VALVE (AUX PWM #7) NOT
OPERATING NORMALLY
30.1 SPN 701/FMI 3 ......................................................................................... 30-3
30.2 SPN 701/FMI 4 ......................................................................................... 30-4
30.3 SPN 701/FMI 5 ......................................................................................... 30-6
31 SPN 704 - WASTEGATE VALVE CONTROL (AUX PWM #10)
31.1 SPN 704/FMI 3 ......................................................................................... 31-3
31.2 SPN 704/FMI 4 ......................................................................................... 31-4
31.3 SPN 704/FMI 5 ......................................................................................... 31-6
32 SPN 706 - ELECTRONIC PROPORTIONING VALVE CONTROL #2
NOT OPERATING NORMALLY
32.1 SPN 706/FMI 3 ......................................................................................... 32-3
32.2 SPN 706/FMI 4 ......................................................................................... 32-5
32.3 SPN 706/FMI 5 ......................................................................................... 32-7
33 SPN 709 - SINGLE-SPEED FAN (LOW-SIDE DIGITAL OUTPUT #3)
FAULT
33.1 SPN 709/FMI 3 ......................................................................................... 33-3
33.2 SPN 709/FMI 4 ......................................................................................... 33-5
33.3 SPN 709/FMI 5 ......................................................................................... 33-6
34 SPN 710 - ELECTRONIC PROPORTIONING VALVE 1 (ENTRY
SHUTOFF FLAP) NOT OPERATING NORMALLY
34.1 SPN 710/FMI 3 ......................................................................................... 34-3
34.2 SPN 710/FMI 4 ......................................................................................... 34-4
34.3 SPN 710/FMI 5 ......................................................................................... 34-6
35 SPN 729 - GRID HEATER NOT OPERATING NORMALLY
35.1 SPN 729/FMI 3 ......................................................................................... 35-3
35.2 SPN 729/FMI 4 ......................................................................................... 35-5
36 SPN 723 CAMSHAFT POSITION SENSOR FAULT
36.1 SPN 723/FMI 3 ......................................................................................... 36-3
36.2 SPN 723/FMI 4 ......................................................................................... 36-5
36.3 SPN 723/FMI 8 ......................................................................................... 36-6
36.4 SPN 723/FMI 14 ....................................................................................... 36-7
37 SPN 975 - TWO-SPEED FAN (AUX PWM #6) FAULT
37.1 SPN 975/FMI 3 ......................................................................................... 37-3
37.2 SPN 975/FMI 4 ......................................................................................... 37-5
37.3 SPN 975/FMI 5 ......................................................................................... 37-6
38 SPN 1172 -TURBO COMPRESSOR IN TEMP HIGH OR LOW
38.1 SPN 1172/FMI 3 ....................................................................................... 38-3
38.2 SPN 1172/FMI 4 ....................................................................................... 38-5

viii 6SE568 Copyright PRELIMINARY 2007 DETROIT DIESEL CORPORATION
39 SPN 1176 - TURBO COMPRESSOR INLET PRESSURE OUTSIDE

NORMAL RANGE
39.1 SPN 1176/FMI 3 ....................................................................................... 39-3
39.2 SPN 1176/FMI 4 ....................................................................................... 39-5
40 SPN 1636 INTAKE MANIFOLD TEMPERATURE OUTSIDE OF
NORMAL OPERATING RANGE
40.1 SPN 1636 /FMI 2 ...................................................................................... 40-3
40.2 SPN 1636/FMI 3 ....................................................................................... 40-4
40.3 SPN 1636/FMI 4 ....................................................................................... 40-6
40.4 SPN 1636/FMI 14 ..................................................................................... 40-7
41 SPN 2791 EGR VALVE (AUX PWM #1) FAILED OR OPEN CIRCUIT
41.1 SPN 2791/FMI 3 ....................................................................................... 41-3
41.2 SPN 2791/FMI 4 ....................................................................................... 41-5
41.3 SPN 2791/FMI 5 ....................................................................................... 41-6
42 SPN 3510 ACCELERATOR PEDAL SUPPLY OUTSIDE OF
42.1 SPN 3510/FMI 2 ....................................................................................... 42-3
42.2 SPN 3510/FMI 3 ....................................................................................... 42-5
42.3 SPN 3510/FMI 4 ....................................................................................... 42-6
43 SPN 3563 INTAKE MANIFOLD PRESSURE OUTSIDE NORMAL
RANGE
43.1 SPN 3563/FMI 0/1/2 ................................................................................. 43-3
43.2 SPN 3563/FMI 3 ....................................................................................... 43-6
43.3 SPN 3563/FMI 4 ....................................................................................... 43-8
44 SPN 3659 ELECTRONIC UNIT PUMP #1 NOT OPERATING
NORMALLY
44.1 SPN 3659/FMI 5 ....................................................................................... 44-3
44.2 SPN 3659/FMI 10 ..................................................................................... 44-5
45 SPN 3660 - ELECTRONIC UNIT PUMP #2 NOT OPERATING
NORMALLY
45.1 SPN 3660/FMI 5 ....................................................................................... 45-3
45.2 SPN 3660/FMI 10 ..................................................................................... 45-5
NORMALLY
46.1 SPN 3661/FMI 5 ....................................................................................... 46-3
46.2 SPN 3661/FMI 10 ..................................................................................... 46-5
NORMALLY
47.1 SPN 3662/FMI 5 ....................................................................................... 47-3
47.2 SPN 3662/FMI 10 ..................................................................................... 47-5

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NORMALLY
48.1 SPN 3663/FMI 5 ....................................................................................... 48-3
48.2 SPN 3663/FMI 10 ..................................................................................... 48-5
NORMALLY
49.1 SPN 3664/FMI 5 ....................................................................................... 49-3
49.2 SPN 3664/FMI 10 ..................................................................................... 49-5
50 CPC DIGITAL OUTPUTS SPN/FMI
50.1 CPC DIGITAL OUTPUT FAULT CODES ................................................. 50-3
50.2 TROUBLESHOOTING THE CPC DIGITAL OUTPUTS ........................... 50-3

x 6SE568 Copyright PRELIMINARY 2007 DETROIT DIESEL CORPORATION
1 INTRODUCTION
Section Page
1.1 OVERVIEW .............................................................................................. 1-3

1.2 SCOPE AND USE OF THIS GUIDE ........................................................ 1-4
1.3 SAFETY PRECAUTIONS ........................................................................ 1-6
1-2 6SE568 Copyright PRELIMINARY 2007 DETROIT DIESEL CORPORATION
1.1 OVERVIEW
Detroit Diesel Corporation is the world leader in diesel engines and diesel engine electronics.
DDC has made technological leaps in engine performance and fuel economy. Today, we build the
most dependable electronically controlled diesel engine in the industry.
2007 Electronic Controls provides two industry standard serial data links: SAE Standards J1587
and J1939. SAE Standard J1587 provides two way communications for the diagnostic equipment
and vehicle displays. SAE Standard J1939 provides control data to other vehicle systems such
as transmissions and traction control devices.
As the leader in engine computer systems and technology, Detroit Diesel Corporation remains
focused on providing excellence in products, service support and training. As products become
more and more advanced, todays technicians must become specialized in multiple areas. This
manual is designed with that thought in mind.
Our goal at Detroit Diesel is to be the most customer focused and most responsive engine
manufacturer in the world.

6SE568 Copyright PRELIMINARY 2007 DETROIT DIESEL CORPORATION 1-3
1.2 SCOPE AND USE OF THIS GUIDE
1.2 SCOPE AND USE OF THIS GUIDE
The first half of the manual contain mechanical troubleshooting procedures. The second half
contains instructions for troubleshooting the electronic controls.
This manual is divided into numbered chapters. Each chapter begins with a table of contents.
Pages and illustrations are numbered consecutively within each chapter.
Information can be located by using the table of contents at the front of the manual or the table
of contents at the beginning of each chapter.
Instructions to "Contact Detroit Diesel Customer Service Center" indicate that at the time of this
publication, all known troubleshooting checks have been included. Review any recent Service
Information Bulletins (SIB) or Service Information letters before calling.
It is also suggested that other DDC outlets be contacted. e.g. if you are a dealer or user, contact
your closest DDC Distributor.
Ensure you have the engine serial number when you call. The phone number for Detroit Diesel
Customer Service Center is 313-592-5800.
Instructions in this manual may suggest replacing a non DDC component. It may be required
to contact the supplier of the component, e.g. truck manufacturer for a TPS concern, to obtain
approval to replace the component.
Important: To ensure you receive updates to this manual should the need arise, you must fill out
the Information Card in the front of this manual. Service Information Bulletins are issued via the
DDC extranet. Visit DDCDIRECT at www.accessfreightliner.com.
NOTE:
It is absolutely critical that you understand the EGR system to be qualified to offer any
type of proper diagnostics. Do not waste time trying to troubleshoot a DDC product, you
are not qualified to troubleshoot. Your company may incur wasted labor hours. If you are
qualified to perform a troubleshooting task and have spent more than one hour on that
task, STOP, and contact the Detroit Diesel Customer Support Center at (313) 5925800.
Once you have discussed your options with a customer support center person, you can
perform the required tests and evaluations. Please keep in contact with your customer
support person. Doing so allows you to stay on track.
1.2.1 Mechanical Troubleshooting
Each chapter has a fault as the title (i.e. Excessive White Smoke). The next level within the
chapter is the probable cause/symptom of the fault. Following this are the resolution and
verification of the resolution. The mechanical troubleshooting should be used before the
electronic troubleshooting.

1.2.2 Electronic Troubleshooting
The 2007 Electronic Controls system allows for an increased processor speed and increased
memory.
Instructions for repair in this manual are generic. For example, "Repair Open" is used to advise
the technician that a particular wire has been determined to be broken. In some cases it may
not be best to try and locate the open. It may be that the best repair technique is to replace a
complete harness. The technician should make the determination of the proper repair, with the
best interest of the customer in mind.
Instructions to check terminals and connectors should include checking for proper contact tension.
Using a mating terminal, a modest force should be required to remove a terminal from its mate.
Replace terminals with poor tension.
After completing any repair, always clear fault codes that may have been generated during the
troubleshooting process.
NOTE:
Be aware that troubleshooting in this manual is mostly concerned with DDEC related
codes. Codes associated with other components, e.g. transmissions, ECUs, ABS, etc.
can be found in the related publication.

1.3 SAFETY PRECAUTIONS
The following safety precautions must be observed when working on a Detroit Diesel engine:
PERSONAL INJURY
area.
HOT EXHAUST
PERSONAL INJURY
To avoid injury from accidental engine startup while
servicing the engine, disconnect/disable the starting
system.
All engine installations, especially those within enclosed spaces, should be equipped with an
exhaust discharge pipe so that exhaust gases are delivered into the outside air.

PERSONAL INJURY
To avoid injury from the sudden release of a high-pressure
hose connection, wear a face shield or goggles. Bleed the
air from the air starter system before disconnecting the air
supply hose.

1.3.1 Ether Start
The DDEC Ether Start System is a fully-automatic engine starting fluid system used to assist
a DDEC equipped diesel engine in cold starting conditions. The amount of ether is properly
controlled to optimize the starting process and prevent engine damage. DDEC will control ether
injection using standard sensors to control the ether injection hardware.
FIRE AND TOXICITY

Some pressurized fluid may be trapped in the system. To
avoid personal injury, loosen all connections slowly to
avoid contact with fluid. When required, spray fluid into a
proper container. The engine starting fluid used in DDEC
Ether Start Systems contains extremely flammable and
toxic substances.
FIRE AND TOXICITY

To avoid personal injury, spray the fluid from the bottom of
the valve into an appropriate container. The engine starting
fluid used in DDEC Ether Start Systems contains extremely
flammable and toxic substances.

1.3.2 Exhaust (Start/Run Engine)
Before starting and running an engine, adhere to the following safety precautions:
PERSONAL INJURY
To avoid injury before starting and running the engine,
ensure the vehicle is parked on a level surface, parking
brake is set, and the wheels are blocked.
PERSONAL INJURY
area.
HOT EXHAUST
1.3.3 Glasses
Select appropriate safety glasses for the job. It is especially important to wear safety glasses when
using tools such as hammers, chisels, pullers or punches.

EYE INJURY
To avoid injury from flying debris when using compressed
air, wear adequate eye protection (face shield or safety
goggles) and do not exceed 276 kPa (40 psi) air pressure.

1.3.4 Welding
Wear welding goggles and gloves when welding or using an acetylene torch. Ensure that a metal
shield separates the acetylene and oxygen tanks. These must be securely chained to a cart.
PERSONAL INJURY
To avoid injury from arc welding, gas welding, or
cutting, wear required safety equipment such as an arc
welders face plate or gas welders goggles, welding
gloves, protective apron, long sleeve shirt, head
protection, and safety shoes. Always perform welding
or cutting operations in a well ventilated area. The gas
in oxygen/acetylene cylinders used in gas welding and
cutting is under high pressure. If a cylinder should fall
due to careless handling, the gage end could strike an
obstruction and fracture, resulting in a gas leak leading
to fire or an explosion. If a cylinder should fall resulting
in the gage end breaking off, the sudden release of
cylinder pressure will turn the cylinder into a dangerous
projectile. Observe the following precautions when using
oxygen/acetylene gas cylinders:
Always wear required safety shoes.
Do not handle tanks in a careless manner or with greasy
gloves or slippery hands.
Use a chain, bracket, or other restraining device at all
times to prevent gas cylinders from falling.
Do not place gas cylinders on their sides, but stand
them upright when in use.
Do not drop, drag, roll, or strike a cylinder forcefully.
Always close valves completely when finished welding
or cutting.

FIRE
To avoid injury from fire, check for fuel or oil leaks before
welding or carrying an open flame near the engine.
1.3.5 Pressurized Fluids
Be extremely careful when dealing with fluids under pressure. Fluids under pressure can have
enough force to penetrate the skin. These fluids can infect a minor cut or opening in the skin. If
injured by escaping fluid, see a doctor at once. Serious infection or reaction can result without
immediate medical treatment.
PERSONAL INJURY
To avoid injury from the sudden release of a high-pressure
hose connection, wear a face shield or goggles.
PERSONAL INJURY
To avoid injury from penetrating fluids, do not put your
hands in front of fluid under pressure. Fluids under
pressure can penetrate skin and clothing.

1.3.6 Fuel
Keep the hose and nozzle or the funnel and container in contact with the metal of the fuel tank
when refueling.
FIRE
To avoid injury from fire, keep all potential ignition sources
away from diesel fuel, including open flames, sparks, and
electrical resistance heating elements. Do not smoke when
refueling.
The following cautions should be followed when filling a fuel tank:
FIRE
To avoid injury from fire caused by heated diesel-fuel
vapors:
Keep those people who are not directly involved in
servicing away from the engine.
Stop the engine immediately if a fuel leak is detected.
Do not smoke or allow open flames when working on
an operating engine.
Wear adequate protective clothing (face shield,
insulated gloves and apron, etc.).
To prevent a buildup of potentially volatile vapors, keep
the engine area well ventilated during operation.

FIRE
To avoid injury from fire, contain and eliminate leaks of
flammable fluids as they occur. Failure to eliminate leaks
could result in fire.
1.3.7 Batteries
Electrical storage batteries emit highly flammable hydrogen gas when charging and continue to
do so for some time after receiving a steady charge.
Battery Explosion and Acid Burn

To avoid injury from battery explosion or contact with
battery acid, work in a well ventilated area, wear protective
clothing, and avoid sparks or flames near the battery. If
you come in contact with battery acid:
Flush your skin with water.
Apply baking soda or lime to help neutralize the acid.
Flush your eyes with water.
Get medical attention immediately.
Always disconnect the battery cable before working on the electrical system.
PERSONAL INJURY
To avoid injury from accidental engine startup while
servicing the engine, disconnect/disable the starting
system.

1.3.8 Fire
Keep a charged fire extinguisher within reach. Ensure you have the proper type of extinguisher on
hand.
FIRE
To avoid injury from fire, keep a fire extinguisher near the
grinding machine in case excessive heat should ignite the
oil.
1.3.9 Cleaning Agent
Avoid the use of carbon tetrachloride as a cleaning agent because of the harmful vapors that it
releases. Ensure the work area is adequately ventilated. Use protective gloves, goggles or face
shield, and apron.
PERSONAL INJURY
To avoid injury from harmful vapors or skin contact, do not
use carbon tetrachloride as a cleaning agent.
1.3.10 Diagnostic Equipment
For mobile applications, Detroit Diesel Diagnostic Link (DDDL) must be used by personnel other
than the vehicle operator. The vehicle operator must maintain control of the vehicle while an
assistant performs the diagnostic evaluations.
PERSONAL INJURY
To avoid injury from loss of vehicle/vessel control, the
operator of a DDEC equipped engine must not use or read
any diagnostic tool while the vehicle/vessel is moving.

1.3.11 Working on a Running Engine
When working on an engine that is running, accidental contact with the hot exhaust manifold
can cause severe burns. Remain alert to the location of the rotating fan, pulleys and belts.
Avoid making contact across the two terminals of a battery which can result in severe arcing,
or battery explosion.
PERSONAL INJURY
To avoid injury from rotating belts and fans, do not remove
and discard safety guards.
PERSONAL INJURY
To avoid injury when working near or on an operating
engine, remove loose items of clothing and jewelry. Tie
back or contain long hair that could be caught in any
moving part causing injury.

1.3.12 Optimized Idle
Optimized Idle must be turned on by the factory via order entry or mainframe setup.
UNEXPECTED ENGINE START

To avoid injury from an unexpected startup of an engine
equipped with the Optimized Idle system, remove the
starter relay from the relay holder.
PERSONAL INJURY
To avoid injury from accidental engine startup, replace a
defective ECM with an ECM programmed with identical
inputs and outputs.
1.3.13 Fluoroelastomer
Fluoroelastomer (Viton) parts such as O-rings and seals are perfectly safe to handle under
normal design conditions.
CHEMICAL BURNS
To avoid injury from chemical burns, wear a face
shield and neoprene or PVC gloves when handling
fluoroelastomer O-rings or seals that have been degraded
by excessive heat. Discard gloves after handling degraded
fluoroelastomer parts.
A potential hazard may occur if these components are raised to a temperature above 600F (316C)
(in a fire for example). Fluoroelastomer will decompose (indicated by charring or the appearance
of a black, sticky mass) and produce hydrofluoric acid. This acid is extremely corrosive and, if
touched by bare skin, may cause severe burns (the symptoms could be delayed for several hours).


2 DDEC VI SYSTEM
Section Page
2.1 DDEC VI SYSTEM--HOW IT WORKS ..................................................... 2-3

2.2 MOTOR CONTROL MODULE ................................................................ 2-4
2.3 COMMON POWERTRAIN CONTROLLER ............................................. 2-13
2.4 WIRES AND WIRING .............................................................................. 2-25
2.5 CONDUIT AND LOOM ............................................................................. 2-39
2.6 TAPE AND TAPING ................................................................................. 2-40
2.7 SENSORS ................................................................................................ 2-41
2.8 INSTRUMENT PANEL LAMPS ................................................................ 2-54
2.1 DDEC VI SYSTEMHOW IT WORKS
DDEC VI is a system that monitors and determines all values required for the operation of the
engine. A diagnostic interface is provided to connect to an external diagnosis tester. Besides
the engine related sensors and the engine-resident control unit, the Motor Control Module
(MCM), this system has a cab-mounted control unit for vehicle engine management, the Common
Powertrain Controller (CPC). The connection to the vehicle is made via a CAN interface which
digitally transmits the nominal values (e.g. torque, engine speed specification, etc.) and the actual
values (e.g. engine speed, oil pressure, etc.).
2.1.1 Harnesses
There are two major harness: the Engine Harness (EH) and the Vehicle Interface Harness (VIH).
The Engine Harness is installed at the factory and is delivered connected to all engine sensors, the
fuel injection system, and the MCM.
The OEM supplied Vehicle Interface Harness connects the ECU to other vehicle systems.

2.2 MOTOR CONTROL MODULE
The engine mounted Motor Control Module (MCM) includes control logic to provide overall
engine management. See Figure 2-1.
Figure 2-1 Motor Control Module

2.2.1 MBE4000 Engine Harness
The MCM has a 120pin connector Engine Harness which is factory installed. It also has a
21pin connector which is the responsibility of the OEM. The pinouts for the 120pin connector
for the MBE4000 engine are listed in Table 2-1, Table 2-2, Table 2-3, and Table 2-4.
Pin Function Connector

1 NC
2 NC
3 NC
4 Unit Pump (cyl 4) pin 2
5 Unit Pump Common (cyl 4) pin 1
7 Unit Pump Common (cyl 6)1 pin 1
16 Injector (cyl 4) pin 2
17 Injector Common (cyl 4) pin 1
28 NC
29 DOC Outlet Temp Sensor
30 DPF Delta Pressure Sensor
Table 2-1 MCM Connector MBE4000 (1 of 4) C Sample


31 NC
32 Constant Throttle Valve
33 Two-speed Fan or Variable Speed Fan
34 NC
35 Wastegate
36 NC
37 NC
38 Ground
39 Electrostatic Oil Separator
40 NC
41 Electrostatic Oil Separator
42 NC
43 CKP (+)
44 NC
45 CMP (+)
46 NC
47 Fan Speed
48 CMP (-)
49 NC
50 Sensor Ground
51 Turbo Speed Sensor
52 Sensor Ground
53 NC
54 Engine Oil Pressure Sensor
55 Sensor Ground
56 NC
57 NC
58 Sensor Power Supply
59 NC
60 EGR Throttle Position


61 EGR Valve
62 Power Supply
63 NC
64 Power Supply
65 HC Doser
66 Volute Connection Valve
67 Ground
68 NC
69 Fuel Cutoff Valve
70 NC
71 NC
72 NC
73 CKP (-)
74 NC
75 NC
76 NC
77 Supply Fuel Temperature Sensor
78 NC
79 Grid Heater
80 NC
81 NC
83 NC
84 NC
86 Turbo Compressor In Temperature Sensor
87 Intake Manifold Pressure Sensor
88 Sensor Ground
89 DOC Temp In Sensor
90 Intake Air Throttle Position


91 Power Supply
92 High Tech Grid Heater
93 Power Supply
94 Power Supply
95 Ground
96 Volute Shutoff Valve
97 NC
98 Single-speed Fan or Two-speed Fan
99 NC
100 Intake Air Throttle 5 kHz (+)
101 Intake Air Throttle 5 kHz (-)
102 Sensor Ground
103 Sensor Ground
104 Sensor Ground
105 Sensor Ground
106 Intake Air Temperature Sensor
107 Diagnostic Electrostatic Oil Separator
108 Engine Oil Temperature Sensor
109 EGR Delta Pressure Sensor
110 Engine Coolant Temp Sensor
111 Doser Pressure Sensor
112 NC
113 NC
114 Sensor Ground
115 DPF Temp Out Sensor
116 NC
118 DPF Backpressure Sensor
119 Charge Air Temp Sensor
120 Turbo Compressor Inlet Pressure Sensor

2.2.2 Connector Brackets
The harnesses on MCM must be bracketed and held secure. The bracket design will change for
different engines as the routing is different. The 120pin connector and the 21-pin connector
must be tie-wrapped to the brackets as shown in the following drawing for the MBE engines
(see Figure 2-2).
Figure 2-2 MBE4000 120pin Connector and 21pin Connector Tie-wrapped

to Brackets

2.2.3 MCM 21pin and 31pin Connectors
The wiring for the VIH 21pin to the MCM is listed in Table 2-5. The side of the connector
shown is looking into the pins.
Pin Signal Type Function Connector

21/1 CAN2L Not Used
21/2 CAN2GND Not Used
21/3 CAN2H Not Used
21/4 CAN2GND Not Used
21/5 KL31 Battery (-)
21/7 KL15 IGN
21/10 CAN1GND Engine CAN Shield
21/11 KL30 Battery (+)
21/13 CAN1H Engine CAN +
21/16 CAN1GND Not Used Front
Looking into the Pins on the Harness
21/17 Not Used
21/18 KDiag_S Not Used
21/19 CAN1L Engine CAN
21/20 KL50 Crank Start Input
21/21 START_B Crank Activation Output
Table 2-5 21Pin Connector to the MCM
Part Tyco/Amp Part Number

Connector 115341271
Terminal (strip form) 19688551
Terminal (single) 19688751
Seal 8289042
Backshell 913940501
Table 2-6 21Pin Connector to the MCM Part Numbers
The pinout for the 31pin pigtail on the Engine Harness is listed in Table 2-7. The OEM is
responsible for wiring to this connector.

Pin Function Series 60 MBE900 MBE4000 HDE

31/1 Power Supply #1 EGR Actuator* X X
31/2 Power Supply #2 VNT* X
31/3 Fuel Heater Supply #1 X - X
31/4 AC Compressor Supply (FL) X X X X
31/5 Full Heater Supply #2 X X
31/6 Power Supply #1 Ground* X X
31/7 Power Supply #2 Ground* X
31/8 Ether Start X
Fan Control #2 High of Two-speed Fan
31/9 X X X X
or Variable Speed Fan
31/10 Single Speed Fan or Low for Two-speed Fan X X X X
31/11 Fuel Heater Ground #1 X X
31/12 AC Compressor Ground (FL) X X X X
31/13 Alternator Remote Sense (FL) X X X X
31/14 Spare
31/15 Spare
31/16 Engine Brake Solenoid Control X
DPF Sensor Temperature Exhaust Gas
31/17 X X X X
in Front of Particulate Filter
DPF Sensor Temperature Diesel Oxidation
31/18 X X X X
Catalyst Inlet Temperature
31/19 X X X X
After Particulate Filter
31/20 Full Heater Ground #2 X X
31/21 Alternator Charge Indicator Lamp (FL) X X X X
31/22 Power Supply X X X X
31/23 Fan Speed X X X X
31/24 Sensor Ground (3V) X X X X
31/25 Spare
31/26 Spare
31/27 TCI Temp X
31/28 Sensor Ground (5V) X X X X
31/29 Sensor Supply (2V) X X X X
31/30 X X X X
After Particulate Filter
31/31 X X X X
Before Particulate Filter
*Fused at 15 amps
Optional for MBE900 and HDE. Must use 14 AWG wire and fuse at 20A.
Table 2-7 31pin MCM Pigtail Connector

The part numbers for the 31pin MCM pigtail connector are listed in Table 2-8.

Connector 9673631
Terminal 19299744
Seals (GXL insulation) 8289211
Cavity Plugs 8289221
Backshell 9656361
Table 2-8 31pin MCM Pigtail Connector Part Numbers

2.3 COMMON POWERTRAIN CONTROLLER
The Common Powertrain Controller (CPC) has three 18pin connectors and one 21pin
connector. The following sections contain the connector pin-outs for truck. vocational, transit
bus and crane applications.
The CPC is the interface between the MCM and the vehicle/equipment for engine control and
manages other vehicle/equipment functions. See Figure 2-3.
Figure 2-3 The Common Powertrain Controller

The OEM is responsible for mounting this part in an enclosed, protected environment. The
mounting bracket is the responsibility of the OEM. There must be maximum physical separation
of the VIH from other vehicle/equipment electrical systems. Other electrical system wires should
ideally be at least three feet away from the VIH and should not be parallel to the VIH. This will
eliminate coupling electromagnetic energy from other systems into the VIH.See Figure 2-4 for
the CPC dimensions.
Figure 2-4 CPC Dimensions
NOTE:
The CPC should be mounted with the connectors pointing down.

The CPC communicates over the J1587 and J1939 Data Links to the vehicle (see Figure 2-5).
Figure 2-5 NAFTA Architecture On-highway
Within the CPC, sets of data for specific applications are stored. These include idle speed,
maximum running speed, and speed limitation. Customer programmable parameters are also
stored here.
The CPC receives data from the operator (accelerator pedal position, switches, various sensors)
and other electronic control units (for example, synchronization controllers for more than one
genset, air compressor controls).
From this data, instructions are computed for controlling the engine and transmitted to the MCM
via the proprietary data link.
2.3.1 Environmental Conditions
Temperature, vibration, and water intrusion must be considered.
2.3.1.1 Temperature
The ambient operating temperature range is 40F to 185F (-40C to 85C).
2.3.1.2 Water Intrusion
The CPC is not water tight and cannot be subject to water spray. It must be mounted in an
enclosed, protected environment.

2.3.2 CPC Vehicle Interface Harness
The OEM supplied Vehicle Interface Harness (VIH) connects the CPC to the MCM and other
vehicle systems (see Figure 2-6).
Figure 2-6 Vehicle Interface Harness

The following criteria are to be used when designing the VIH:

The four vehicle connectors are designed to accept 18 AWG wires for all circuits.
The conductor must be annealed copper, not aluminum, and must comply with the industry
standard SAE J1128 document.
Color code the wires as shown in the schematics. If the wires used are the same color,
hot stamp the cavity number on the wires.
NOTE:
The Vehicle Speed Sensor (VSS) must be a twisted pair. The twists are a minimum of 12
turns per foot (305 mm) and are required to minimize electromagnetic field coupling.
NOTE:
J1939 cable is required for the J1939 datalink wires. Refer to SAE J193911 spec
for specific requirements.
The low speed propriety Engine-CAN link between the MCM and the CPC must be a twisted
shielded cable with 0.75 mm diameter wire (approximately 20 AWG), bundle shielded with drain
wire and 30 twists per meter. The insulation is rated to 105C. Termination resistors for the
Engine-CAN link are located in the CPC and MCM.
2.3.2.1 Frequency Input
The CPC has one frequency input on the VIH that can accept a variable reluctance sensor. A
typical frequency input functions is the Vehicle Speed Sensor (VSS). Requirements for a variable
reluctance signal interface are listed in Table 2-9.
Parameter Range
Input Amplitude Range V Peak to Peak
Input Frequency Range 0 to 10,000 Hz
Table 2-9 Variable Reluctance Signal Interface
2.3.3 Power Supply 12 Volt System
Normal operating voltage on a 12 V system for the CPC and MCM is 11-16 VDC.
NOTICE:
Operating the CPC or MCM over the voltage limits of 16 volts
will cause damage to the CPC or MCM.
Operating the CPC and/or MCM between 8 and 11 volts may result in degraded engine operation.
(Transient operation in this range during engine starting is considered normal for 12 volt systems.)

NOTICE:
Reversing polarity will cause damage to the CPC and/or MCM if
the Power Harness is not properly fused.
NOTE:
All output loads, ignition and CPC power must be powered from the same battery
voltage source.
2.3.3.1 Average Current Draw
The maximum average current draw is listed in Table 2-10. This information should be used
to size the alternator.
Maximum Average Current Draw

System (12 V Nominal Supply)
Crank Idle Full Load/Rated Speed
MCM Engine Loads 1.0 A avg 21.0 A avg 25.0 A avg
CPC Vehicle Loads* 18.0 A peak 55.0 A peak 55.0 A peak
* Vehicle loads are controlled by the OEMs who can best determine the total maximum current draw for their installation.
Table 2-10 Maximum Average Current Draw
The current draw for a CPC configuration is listed in Table 2-11.
Configuration Condition Current

Ignition Off 300 A
CPC
Ignition On and Engine Stopped 175 mA
Table 2-11 Current Draw for CPC Configuration
The current draw for a MCM is listed in Table 2-12.
Configuration Condition Current

Ignition Off <1 mA
MCM
Ignition On and Engine Stopped 400 mA
Table 2-12 Current Draw for MCM Configuration
2.3.3.2 Battery Isolator
A battery isolator is not required. However, some applications require a battery that is dedicated
to the engine and completely isolated from the rest of the vehicle. Commercially available battery
isolators can be used.

2.3.3.3 Main Power Shutdown
The main power supply shutdown schematic shows the DDC approved method for main power
switch implementation. See Figure 2-7.
Figure 2-7 Main Power Supply Shutdown
NOTE:
Switches must remain closed for 30 seconds after ignition is off for the MCM and CPC to
write non-volatile data.
NOTE:
It is recommended that both the positive (+) and negative (-) battery leads be
disconnected.

NOTE:
Disconnecting positive power is not sufficient to isolate the CPC for welding purposes.
NOTICE:
When welding, the following must be done to avoid damage to
the electronic controls or the engine:
Both the positive (+) and negative (-) battery leads must be
disconnected before welding.
The welding ground wire must be in close proximity to
welding location - the engine must never be used as a
grounding point.
Welding on the engine or engine mounted components is
NEVER recommended.
NOTE:
The alternator should be connected directly to the battery for isolation purposes.
2.3.4 Fuses
A Battery (+) fuse and an ignition circuit fuse must be provided by the vehicle wiring harness.
Blade-type automotive fuses are normally utilized; however, manual or automatic reset circuit
breakers which meet the following requirements are also acceptable. The fuse voltage rating must
be compatible with the CPC MCM's maximum operating voltage of 16 volts.
FIRE
To avoid injury from fire, additional loads should not be
placed on existing circuits. Additional loads may blow the
fuse (or trip the circuit breaker) and cause the circuit to
overheat and burn.

FIRE
To avoid injury from fire, do not replace an existing fuse
with a larger amperage fuse. The increased current
may overheat the wiring, causing the insulation and
surrounding materials to burn.
The ignition fuse current rating must be sized for the loads utilized in each application; however,
a rating of between 5 and 10 amps is usually sufficient.
The Battery (+) fuse current rating must satisfy two criteria:
Must not open during normal operation
Must open before the MCM or CPC is damaged during a reverse battery condition
Bussmann ATC-30 and Delphi Packard Electric Systems MaxiFuse 30 amp rated fuses or
equivalent will satisfy these requirements. Acceptable blow times versus current and temperature
derating characteristics are listed in Table 2-13 and Table 2-14.
% of Rated Fuse Current Minimum Blow Time Maximum Blow Time

100% 100 hours -
135% 1 minutes 30 minute
200% 6 seconds 40 seconds
Table 2-13 Fuse Current and Blow Time
Temperature % of Rated Fuse Current

-40C 110% max
+25C 100%
+120C 80% min
Table 2-14 Fuse Temperature and Current
2.3.5 Connectors
There are three 18pin connectors and one 21pin connector to the CPC. The OEM is responsible
for the four connectors at the CPC, the 21pin connector at the MCM, the 31pin MCM pigtail
connector and the 10pin DPF connector.
NOTE:
The CPC connectors are not water tight and cannot be subject to water spray.
The part numbers for the CPC connectors, the 21pin connector at the MCM, the 31pin MCM
pigtail connector and the 10pin DPF connector are listed in the following tables.

Part Tyco/Amp Part Number DDC Part Number

CPC - 18 Pin Connector - B Key 7-968974-2 A 018 545 67 26
CPC - socket 0.5-1.0mm wire (single) A 013 545 76 26
CPC - socket 1.0-2.5mm wire (single) 1-968873-3 A 013 545 78 26
CPC - socket 1.0-2.5mm wire (strip) 1-968851-3
Table 2-15 Connector #1, 18pin Connector, B Key

CPC - 18 Pin Connector - A Key 8-968974-2 A 013 545 64 26
Table 2-16 Connector #2, 18pin Connector, A Key

CPC - 21 Pin Connector - A Key 8-968975-2 A 013 545 65 26
Table 2-17 Connector #3, 21pin Connector, Key A

CPC - 18 Pin Connector - C Key 69689742 A 018 545 68 26
CPC - socket 1.0-2.5mm wire (single) 19688733 A 013 545 78 26
Table 2-18 Connector #4, 18pin Connector, Key C

Connector 115341271
Terminal (strip form) 19688551
Terminal (single) 19688751
Seal 8289042
Backshell 913940501
Table 2-19 21Pin Connector to the MCM


Connector 9673631
Terminal 19299744
Seals (GXL insulation) 8289211
Cavity Plugs 8289221
Backshell 9656361
Table 2-20 31pin MCM Pigtail Connector
Part FCI Part Numbers

Connector 54201016
Terminal LSP 1811 58AU
Plug 54200005
Table 2-21 FCI Part Numbers for the DPF 10-pin Connector
2.3.5.1 Data Link Connector
The SAE J1708/J1587 nine-pin data link connector is required. DDC recommends that the
OEM-supplied Data Link Connector be conveniently positioned in a well protected location
facilitating subsequent DDDL usage (i.e., reprogramming, diagnostics, etc.).
NOTE:
REQUIRED: The J1939 data link must be wired to this connector.
The components listed in Table 2-22 are required to incorporate a SAE J1939/J1587 Data Link in
a VIH for diagnostic and reprogramming devices.
Component DDC Part Number Deutsch Part Number

Nine-pin Deutsch Connector 23529496 HD10-9-1939P
Connector Cover 23529497 HDC 169
Two (2) Cavity Plugs 23507136 114017
Seven (7) Terminals 23507132 0460-202-16141
Table 2-22 VIH Components to Incorporate an SAE J1939/J1587 Data Link

The following illustration shows the wiring for the nine-pin connector (see see Figure 2-8).
Figure 2-8 Wiring for 9-pin Data Link Connector
The SAE J1587/J1708 Data Link must be twisted pairs. The twists are a minimum of 12 turns per
foot (305 mm). The maximum length for the SAE J1587/J1708 Data Link is 130 ft (40 m).

2.4 WIRES AND WIRING
Detroit Diesel Corporation recommends color coding and hot stamping wire numbers in
contrasting colors at intervals of four inches or less.
2.4.1 General Requirements
NOTE:
Avoid renumbering DDC circuits since all troubleshooting guides reference the circuit
numbers shown in the schematic. DDC suggests including a prefix or suffix with the
DDC circuit numbers when conflicts exist.
2.4.2 General Wire
All wires used in conjunction with DDEC VI must meet the following criteria:
NOTICE:
DDC does not recommend using any type of terminal lubricant
or grease compounds. These products may cause dirt or other
harmful substances to be retained in the connector. DDC has
not tested these products and cannot stand behind their use.
NOTICE:
Insulation must be free of nicks.
Tape, conduit, loom or a combination thereof must be used to protect the wires.
Refer to section 2.6 and refer to section 2.5.
All wires must be annealed copper wire (not aluminum).
All wires must comply with SAE J1128.
All wires must be insulated with cross-link polyethylene (XLPE) such as GXL, or any
self-extinguishing insulation having a minimum rating of -40C (-40F) to 125C (257F).

2.4.3 Crimp tools
The part numbers for the crimp tools for working with the MCM and CPC connectors are
listed in Table 2-23.
Description Part Number

Extraction Tool 7265031
Hand Crimp Tool 1694000
Crimp Dies for 0.5 mm 1.0 mm Terminals 7342620
Crimp Dies for 1.0 mm 2.5 mm Terminals 1699170
Table 2-23 Crimp Tools
2.4.4 Deutsch Terminal Installation And Removal
The method of terminal installation and removal varies. The following sections cover Deutsch
terminal installation and removal.
2.4.4.1 Deutsch Terminal Installation Guidelines
Deutsch connectors have cable seals molded into the connector. These connectors are push-to-seat
connectors with cylindrical terminals. The diagnostic connector terminals are gold plated for
clarity.
NOTICE:
Improper selection and use of crimp tools have varying adverse
effects on crimp geometry and effectiveness. Proper installation
of terminals require specialized tools. Do not attempt to use
alternative tools.
The crimp tool to use in Deutsch terminal installation is J34182 (Kent-Moore part number).
NOTICE:
Terminal crimps must be made with the Deutsch crimp tool
P/N: HDT-48-00 to assure gas tight connections.
NOTICE:
If a separate seal is required, be sure to install the seal onto the
wire before stripping the insulation.

Use the following instructions for installing Deutsch terminals:

1. Strip approximately .25 inch (6 mm) of insulation from the cable.
2. Remove the lock clip, raise the wire gage selector, and rotate the knob to the number
matching the gage wire that is being used.
3. Lower the selector and insert the lock clip.
4. Position the contact so that the crimp barrel is 1/32 of an inch above the four indenters.
See Figure 2-9. Crimp the cable.
Figure 2-9 Setting Wire Gage Selector and Positioning the Contact
5. Grasp the contact approximately one inch behind the contact crimp barrel. Hold the
connector with the rear grommet facing you. See Figure 2-10.
Figure 2-10 Pushing Contact Into Grommet

6. Push the contact into the grommet until a positive stop is felt. See Figure 2-10. A slight
tug will confirm that it is properly locked into place. See Figure 2-11.
Figure 2-11 Locking Terminal Into Connector
2.4.4.2 Deutsch Terminal Removal
The appropriate size removal tool should be used when removing cables from connectors. The
proper removal tools are listed in Table 2-24.
Tool Kent-Moore Part Number

Removing (12 AWG) J37451
Removing (16-18 AWG) J34513-1
Table 2-24 Removal Tools for Deutsch Terminals

Remove Deutsch terminals as follows:

1. With the rear insert toward you, snap the appropriate size remover tool over the cable of
contact to be removed. See Figure 2-12.
Figure 2-12 Removal Tool Position
2. Slide the tool along the cable into the insert cavity until it engages and resistance is felt.
Do not twist or insert tool at an angle. See Figure 2-13.
Figure 2-13 Removal Tool Insertion
3. Pull contact cable assembly out of the connector. Keep reverse tension on the cable and
forward tension on the tool.

2.4.5 Splicing Guidelines
The following are guidelines which may be used for splices. The selection of crimpers and
splice connectors is optional. Select a high quality crimper equivalent to the Kent-Moore tool,
J38706, and commercially available splice clips.
The recommended technique for splicing and repairing circuits (other than power and ignition
circuits) is a clipped and soldered splice. Alternatively, any method that produces a high quality,
tight (mechanically and electronically sound) splice with durable insulation is considered to
be acceptable.
2.4.5.1 Clipped and Soldered Splicing Method
The tools required are listed in Table 2-25.
Tool Part Number

Heat Gun --
Sn 60 solder with rosin core flux --
Wire Stripper Kent-Moore J35615 or equivalent
Splice Clips (commercially available) Wire size dependent
Heat Shrink Tubing Raychem HTAT or equivalent
Table 2-25 Recommended Splicing Tools
The criteria for splicing straight leads is:

No more than one strand in a 16 strand wire may be cut or missing.
Use Sn 60 solder with rosin core flux.
The exposed wire must be clean before the splice is soldered.

Soldering splice connectors is optional. To solder splice connectors:

1. Position the leads, so one overlaps the other. See Figure 2-14.
Figure 2-14 Positioning the Leads
2. Secure the leads with a commercially available clip and hand tool. See Figure 2-15.
Figure 2-15 Securing the Leads With a Clip
3. Use a suitable electronic soldering iron to heat the wires. Apply the solder to the heated
wire and clip (not to the soldering iron) allowing sufficient solder flow into the splice joint.

4. Pull on wire to assure crimping and soldering integrity. The criteria listed in Table 2-26
must be met.
Wire Gage Must Withstand Applied Load

14 AWG 45 lb (200 N)
16 AWG 27 lb (120 N)
18 AWG 20 lb (90 N)
Table 2-26 Applied Load Criteria for Terminals
5. Loop the lead back over the spliced joint and tape. See Figure 2-16.
Figure 2-16 Recommended Strain Relief of Spliced Joint
2.4.5.2 Splicing and Repairing Straight Leads-Alternate Method 1
The tools required are listed in Table 2-27.
Tool Part Number

Heat Gun --
Terminal Crimper for Metri-Pack 280 (12 AWG) Kent-Moore J38125-6
Terminal Crimper for Metri-Pack 280 (18 AWG) Kent-Moore J39848
Terminal Crimper for Weather Pack Kent-Moore J35606
Terminal Crimper for Deutsch Kent-Moore J34182
Terminal Crimper for Metri-Pack 150 Kent-Moore J35123

NOTE:
When splicing straight leads, no more than one strand in a 16 strand wire may be cut or
missing.
The recommended method to splice straight leads follows:

1. Locate broken wire.
2. Remove insulation as required; be sure exposed wire is clean and not corroded.
3. Insert one wire into the splice clip until it butts against the clip. Stop and crimp (see
Figure 2-17, A).
4. Insert the other wire into the splice clip until it butts against the clip stop (see Figure
2-17, B).
NOTICE:
Any terminal that is cracked or ruptured is unacceptable as
malfunctions may occur.
5. Visually inspect the splice clip for cracks, rupture, or other crimping damage. Remove and
replace damaged clips before proceeding.
6. Pull on wire to ensure the splice integrity. The criteria listed in Table 2-28 must be met.
Wire Gage Must Withstand Applied Load

14 AWG 45 lb (200 N)
16 AWG 27 lb (120 N)
18 AWG 20 lb (90 N)
Table 2-28 Applied Load Criteria for Terminals
7. Shrink the splice clip insulative casing with a heat gun to seal the splice (see Figure
2-17, C).

NOTICE:
Splices may not be closer than 12 in. (.3 m) apart to avoid
degradation in circuit performance. Replace wire to avoid having
splices closer than 12 in. (.3 m) apart.
Figure 2-17 Splicing Straight Leads - Alternate Method 1

2.4.5.3 Splicing and Repairing Straight Leads - Alternate Method 2
This method is not allowed or recommended for power or ignition circuits. The tools required are
listed in Table 2-29.
Tool Part Number

Heat Gun --
Terminal Crimper for Metri-Pack 280 (12 AWG) Kent-Moore J38125-6
Terminal Crimper for Metri-Pack 280 (18 AWG) Kent-Moore J39848
Terminal Crimper for Weather Pack Kent-Moore J35606
Terminal Crimper for Deutsch Kent-Moore J34182
Terminal Crimper for Metri-Pack 150 Kent-Moore J35123
NOTE:
When splicing straight leads, no more than one strand in a 16 strand wire may be cut or
missing.
An acceptable option for splicing straight leads is:

1. Locate broken wire.
2. Remove insulation as required; be sure exposed wire is clean and not corroded.
3. Slide a sleeve of glue lined, shrink tubing (Raychem HTAT or equivalent) long enough to
cover the splice clip on the wire and overlap the wire insulation, about .25 in. (6 mm) on
both sides (see Figure 2-18, A).
4. Insert one wire into splice clip until it butts against the splice clip. Stop and crimp (see
Figure 2-18, B).
5. Insert the remaining wires into the splice clip one at a time until each butts against the
splice clip; stop and crimp (see Figure 2-18, B).
NOTICE:
Any terminal that is cracked or ruptured is unacceptable as
malfunctions may occur.
6. Visually inspect the terminal for cracks, rupture, or other crimping damage. Remove and
replace damaged terminal before proceeding.
7. Slide the shrink tubing over the crimped splice clip (see Figure 2-18, C).
8. Shrink tubing with a heat gun to seal the splice (see Figure 2-18, D).

NOTICE:
A minimum of two layers of heat shrink tubing must be applied
to splices that have more than one lead in or out.
Figure 2-18 Splicing Straight Leads - Alternate Method 2

2.4.5.4 Shrink Wrap
Shrink wrap is required when splicing non insulated connections. Raychem HTAT or any
equivalent heat shrink dual wall epoxy encapsulating adhesive polyolefin is required. Shrink wrap
must extend at least .25 in. (6 mm) over wire insulation past splice in both directions.
To heat shrink wrap a splice:
NOTICE:
The heat shrink wrap must overlap the wire insulation about
.25 in. (6 mm) on both sides of the splice.
1. Select the correct diameter to allow a tight wrap when heated.

2. Heat the shrink wrap with a heat gun; do not concentrate the heat in one location, but
apply the heat over the entire length of shrink wrap until the joint is complete.
3. Repeat step 2 to apply a second layer of protection (if required by splicing guidelines).

2.4.5.5 Staggering Wire Splices
Position spliced wires properly as follows:
NOTICE:
You must stagger positions to prevent a large bulge in the
harness and to prevent the wires from chafing against each
other.
1. Stagger the position of each splice (see Figure 2-19) so there is at least a 2.5 in. (65
mm) separation between splices.
Figure 2-19 The Correct and Incorrect Method of Staggering Multiple Splices
NOTICE:
A minimum of two layers of heat shrink tubing extending .25 in.
(6 mm) past the splice must be used to complete the splice.
2. Heat shrink a minimum of two layers of heat shrink tubing.

3. Tape the spliced wires to each other. Refer to section 2.5.

2.5 CONDUIT AND LOOM
Conduit must be used to protect the harness cable and cable splices.
NOTICE:
The conduit must not cover any connectors, switches, relays,
fuses, or sensors.
The following guidelines should be used when designing a harness:
NOTICE:
Wires should be sized and cut to near equal length prior to
installing conduit.
The distance between the back of the connector or other listed devices to the end of the
conduit should not exceed:
0.5 in. (12.7 mm) for a single connector/device
1.0 in. (25.4 mm) for a double connector/device
1.5 in. (38.1 mm) for multiple (three or more) connectors/devices
All cable breakouts and conduit ends must be secured in place with conduit outlet rings or
tape.
2.5.1 Criteria for Conduit and Loom
Due to the wide variety of operating conditions and environments, it is the responsibility of the
OEM to select a conduit that will survive the conditions of the specific applications. Flame
retardant convoluted polypropylene conduit or equivalent may be used for most installations.
Heat retardant nylon conduit or oil, water, acid, fire, and abrasion resistant non-metallic loom
conforming to SAE J562A* is also acceptable. The diameter of conduit should be selected based
on the number of wires being protected.
* If non-metallic loom is used, secure the ends with tightly wrapped nylon straps to prevent
unraveling.
Conduit should cover the wires without binding and without being excessively large.

2.6 TAPE AND TAPING
2.6 TAPE AND TAPING
Tape must be used when conduit is utilized. Be sure to follow the tape manufacturers' guidelines.
The harness manufacturer may use tape under the harness covering (conduit or loom) to facilitate
harness building. Tape must be tightly wrapped at all conduit interconnections with a minimum of
two layers. Be sure to firmly secure the start and finish ends of tape.
2.6.1 Tape Criteria
In applications where the temperature doesn't exceed 176F (80C), black vinyl electrical tape
that is flame retardant and weather resistant may be used.
NOTICE:
Black vinyl electrical tape should not be used in applications
where the temperature exceeds 176F (80C).
In applications where temperature exceeds 176F (80C), vinyl electrical tape should not be used.
For these applications, adhesive cloth backed, flame retardant polyethylene or fiber glass tape
(Delphi #PM-2203, Polikan #165 or equivalent) is recommended.
2.6.2 Taping Criteria
The tape must extend a minimum of 1 in. (25 mm) past the conduit.
The tape must be crossed over butted conduit ends.
The tape must be extended a minimum of 1 in. (25 mm) in each direction at all branches.

2.7 SENSORS
DDEC is designed to operate with several types of sensors as listed in Table 2-30.
Sensor Type Description

Used to monitor the crankshaft position, engine speed, turbo
Variable Reluctance/Magnetic Pick-up
speed, and vehicle speed.
Thermistor Used to monitor temperatures.
Variable Capacitance Used to monitor manifold, and oil gallery pressures.
Variable Resistance (Potentiometer) Used to sense throttle position.
Switch Used to signal coolant level.
Table 2-30 Sensor Types
The sensors integrated into the Engine Harness are factory-installed (refer to section 2.7.1). The
sensors integrated into the Vehicle Interface Harness are installed by the OEM (refer to section
2.7.2).

2.7 SENSORS
2.7.1 Factory-installed Sensors
The sensors integrated into the factory-installed Engine Harness are listed in Table 2-31.
Sensor Function
Senses crankshaft position and engine speed for functions such
Camshaft Position Sensor (CMP Sensor)
as fuel control strategy.
Crankshaft Position Sensor
Indicates a specific cylinder in the firing order.
(CKP Sensor)
Sensor measures pressure on the outlet of the after-treatment
DPF Inlet Pressure Sensor device in the exhaust system of the vehicle. Located after the DPF
that is within the after-treatment device.
Sensor measures pressure between the Diesel Oxidation Catalyst
DPF Outlet Pressure Sensor (DOC) and the Diesel Particulate Filter (DPF) in the after-treatment
assembly located in the exhaust system of the vehicle.
Temperature measured at the outlet of the after-treatment system
DPF Outlet Temperature Sensor that is installed within the exhaust system of the vehicle. It's
located after the DPF that is within the after-treatment unit.
Temperature measured at the inlet of the after-treatment device in
DOC Inlet Temperature the exhaust system of the vehicle. Located before the DOC that is
within the after-treatment device.
Temperature measured between the DOC and the DPF in the
DOC Outlet Temperature after-treatment assembly located in the exhaust system of the
vehicle.
Engine Coolant Temperature Sensor Senses coolant temperature for functions such as engine
(ECT Sensor) protection, fan control and engine fueling.
Senses EGR exhaust temperature after EGR cooler. Used for
EGR Temperature Sensor
EGR system diagnosis.
Engine Oil Pressure Sensor
Senses gallery oil pressure for functions such as engine protection.
(EOP Sensor)
Engine Oil Temperature Sensor Senses oil temperature for functions such as reducing variation
(EOT Sensor) in fuel injection and fan control.
Intake Manifold Pressure Sensor Senses turbo boost for functions such as smoke control and engine
(IMP Sensor) protection.
Intake Manifold Temperature Sensor
Senses boost temperature
(IMT Sensor)
Supply Fuel Temperature Sensor
Senses fuel temperature for functions such as engine fueling.
(SFT Sensor)
Turbo Compressor Temperature
Senses turbo out air temperature.
Out Sensor
Turbo Speed Sensor Monitors turbo speed.
Table 2-31 Function of Factory-installed Sensors

See Figure 2-20 for the location of the sensors for the DOC and DPF.
Figure 2-20 Sensor Location for the DOC and DPF

2.7 SENSORS
2.7.2 OEM-installed Sensors
All sensors must be of the proper type and continuously monitor vehicular and environmental
conditions, so the MCM can react to changing situations.
The OEM is responsible for installing the sensors listed in Table 2-32.
Sensor Part Number Function

23526906
Engine Coolant Level Sensor Senses coolant level for engine protection. Refer to section
23526905
(ECL Sensor) 2.7.3.
23526907
Turbo Compressor In Senses the temperature of the turbo compressor inlet.
23527831
Temperature Sensor Refer to section 2.7.4.
Senses vehicle speed for Cruise Control and Vehicle Speed
Vehicle Speed Sensor (VSS) -
Limiting. Refer to section 2.7.5.
* Available in some applications
Table 2-32 Function and Guidelines for OEM-installed Sensors
NOTE:
The OEM harness must be securely fastened every six (6) in. It is required that the
harness be fastened within six (6) in. of the sensor.

2.7.3 Engine Coolant Level Sensor
The ECL Sensor provides an input to the engine protection system and warn the operator if a
low coolant level has been reached.
The main component of the ECL Sensor consists of a conductivity probe, which connects to
the CPC (see Figure 2-21).
NOTICE:
The probe has an operational temperature range of -40 to 257F
(-40 to 125C). Exposure to temperatures beyond this range
may result in unacceptable component life, or degraded sensor
accuracy.
Figure 2-21 Engine Coolant Level Sensor Specifications
The connector listed in Table 2-33 is a Metri-Pack 280 series push-to-seat connector.
Coolant Level Sensor Connector

Connector P/N: 15300027
Terminal P/N: 12077411
Seal P/N: 12015323
Secondary Lock P/N: 15300014
Table 2-33 Metri-Pack 280 Connectors and Part Numbers

2.7 SENSORS
The OEM must connect the ECL Sensor probe as shown in the next illustration (see Figure 2-22).
Polarity of the ground and signal must be correct for proper operation.
Figure 2-22 Engine Coolant Level Sensor Installation for CPC

The probe should be located in either the radiator top tank or a remote mounted surge tank. It
should be mounted horizontally in the center of the tank and must be in a position to signal low
coolant before aeration occurs. Typically, this is a height representing 98% of the drawdown
quantity. The probe should be located so that it is not splashed by deaeration line, stand pipe or
coolant return line flows. The insulated portion of the probe should be inserted into the coolant
1/2 in. or more past the inside wall of the tank. See Figure 2-23.
Figure 2-23 Engine Coolant Level Sensor Location - Top of Radiator Tank
Determine proper location for low coolant level sensor while running the drawdown test. It must
actuate a warning before the satisfactory drawdown level is reached.
The ECL Sensor components are OEM supplied hardware and can be purchased as kits or
individual components, depending on OEM requirements.

2.7 SENSORS
The following kits listed in Table 2-34 and Table 2-35 provide all the necessary hardware for
proper installation of the ECL Sensor. Kits are available through the DDC parts distribution
network.
Component Part Number

ECL Sensor 23526905
Metri-Pack Connector Kit 15300027
Metri-Pack Terminals 12077411
Secondary Lock 15300014
wire Seal 12015323
Terminal 12103881
Table 2-34 ECL Sensor Installation Kit 1/4 in. NPTF P/N: 23515397
Component Part Number

ECL Sensor 23526906
Metri-Pack Connector Kit 15300027
Metri-Pack Terminals 12077411
Secondary Lock 15300014
Wire Seal 12015323
Terminal 12103881
Table 2-35 ECL Sensor Installation Kit 3/8 in. NPTF P/N: 23515398
The sensor must be enabled with VEPS or the DRS as listed in Table 2-36.
Parameter Options Default

0 = Disabled
1 = Dual Level Probe Sensor (IMO)
Cool Level Sensor Input Enable 2
2 = Single Level Probe Sensor
3 = Dual Level Float Sensor (FTL)
Table 2-36 Enabling the Engine Coolant Level Sensor

2.7.4 Turbo Compressor In Temperature Sensor
The Turbo Compressor In Temperature Sensor (TCI Sensor) produces a signal representing the
temperature of the turbo compressor inlet. See Figure 2-24.
Figure 2-24 Turbo Compressor In Temperature Sensor
This sensor is required for the Series 60.

The maximum vibration for the sensor is 5 g. The sensor must be torqued between 10 ft lb
and 20 ft lb. The harness must be fastened within 6 in of the sensor. The maximum operating
temperature for this sensor is 248F (120C).
Install the Turbo Compressor In Temperature Sensor in the filtered air side of the air filter canister.
Otherwise it must be mounted between the air cleaner and the turbocharger compressor inlet.
This sensor has a pigtail on the Engine Harness. It it does not fit your application, this circuit
is also available in the 31pin Engine Harness connector. The OEM is responsible for wiring
this sensor to either location.

2.7 SENSORS
2.7.5 Vehicle Speed Sensor
The CPC can calculate vehicle speed providing that it is properly programmed and interfaced
with a Vehicle Speed Sensor (VSS) that meets requirements. The VSS (see Figure 2-25) provides
a vehicle speed signal for use in Cruise Control and Vehicle Speed Limiting. The VSS signal
type can be changed v
NOTE:
DDC does not approve of the use of signal generator sensors.
Figure 2-25 Vehicle Speed Sensor
To obtain accurate vehicle mileage, the parameters listed in Table 2-37 must be programmed
with VEPS, DRS, or DDDL for DDEC VI.
Parameter Range Default

0 = No Sensor
1 = C3 Sensor
2 = Square Wave (Hall Sensor)
Vehicle Speed Sensor 3 = Vehicle Speed over J1939 (ECT1) 4 = Magnetic
4 = Magnetic Pickup
5 = Vehicle Speed via J1939 (TCO1, SPN 1624)
8 = Vehicle Speed via J1939 (CCVS, SPN 84)
Axle Ratio 1 20.0 5.29
Number of Output Shaft Teeth 0 250 16
Tire Revs per Unit Distance 160 1599 312
Top Gear Ratio 0.1 2.55 1
Second Highest Gear Ratio 0.1 2.55 1
Two Spd Axle Second Axle Ratio 1 20.0 5.29
0 = Disable
1 = Enable VSS ABS Anti Tampering Function
Anti Tamper 0 = Disable
2 = Enable VSS without ABS Anti
Tampering Function
Table 2-37 Vehicle Speed Sensor Parameters

2.7.5.1 Magnetic Pickup
The magnetic pickup requirements are listed in Table 2-38. Magnetic Pickup size is determined
by installation requirements.
Parameters Range
Frequency Range 0 - 10 kHz
Low Threshold Voltage >1.8 Volts Peak to Peak
Table 2-38 Magnetic Pickup Vehicle Speed Sensor Requirements
The Vehicle Speed Sensor is wired to the 21pin #3 connector of the CPC as listed in Table 2-39.
CPC Connector/Pin Function

3/13 VSS (+)
3/14 VSS (-)
Table 2-39 Vehicle Speed Sensor Wiring

2.7 SENSORS
See Figure 2-26 for the installation of the Magnetic VSS.
Figure 2-26 Magnetic Vehicle Speed Sensor Installation CPC

2.7.5.2 SAE J1939 Data Link
A VSS wired to the CPC is not required if the transmission output shaft speed message is being
transmitted over the SAE J1939 Data Link. To obtain accurate vehicle mileage, the parameters
listed in Table 2-40 must be programmed with VEPS.
Parameter Range Default

0 = No Sensor
1 = C3 Sensor
2 = Square Wave (Hall Sensor)
Vehicle Speed Sensor 3 = Vehicle Speed over J1939 4 = Magnetic
4 = Magnetic Pickup
5 = Vehicle Speed via J1939 (TCO1, SPN 1624)
8 = Vehicle Speed via J1939 (CCVS, SPN 84)
Axle Ratio 1 20.0 5.29
Tire Revs per Unit Distance 160 1599 312
Top Gear Ratio 0.1 2.55 1
Second Highest Gear Ratio 0 5.75 2.55
Two Spd Axle Second
1 20.0 5.29
Axle Ratio
0 = Disable
Anti Tamper 1 = Enable VSS ABS Anti Tampering Function 0 = Disable
2 = Enable VSS without ABS Anti Tampering Function
Table 2-40 Vehicle Speed Sensor Parameters for Transmission Output Shaft
Speed
2.7.5.3 VSS Anti-tamper
If the sensor appears to be working improperly, but the vehicle speed is not zero, VSS
Anti-Tamper will log a VSS fault.

2.8 INSTRUMENT PANEL LAMPS
2.8 INSTRUMENT PANEL LAMPS
The instrument panel lamps are listed in Table 2-41.
Lamp Lamp Name Description Driver Action
Amber Warning Lamp Indicates a fault with the Truck can be driven to end
(AWL) engine controls. of shift. Call for service.
Indicates a major engine

fault that may result in Move the truck to the
engine damage nearest safe location and
Red Stop Lamp (RSL)
Engine derate and / or shutdown the engine. Call
shutdown sequence will be for service
initiated.
Solid yellow indicates a

manual regeneration is
required.
Truck may be driven to end
Blinking yellow and
of shift. Call for service.
DPF Regeneration Lamp derate or shutdown are
Blinking light indicates
possible if back pressure
attention required now.
exceeds limits. Blinking
yellow during stationary
regeneration
Lamp may be red or
yellow. Indicates exhaust
Truck may be driven. If
temperature is above a
lamp remains illuminated
High Exhaust Temperature preset limit. Illuminates
for an extended period
Lamp (HET) during regeneration
longer than 40 minutes call
process if speed below 30
for service.
mph and during stationary
regeneration
Yellow lamp Indicates a

failure of an Emission
Malfunction Indicator Control device. May Truck may be driven to end
Lamp (MIL) illuminate at the same time of the shift. Call for service
as the Amber Warning
Lamp
Table 2-41 Instrument Panel Lamps

3 SPN 27 - EGR VALVE POSITION CIRCUIT FAULT
Section Page
3.1 SPN 27/FMI 3 ........................................................................................... 3-3

3.2 SPN 27/FMI 4 ........................................................................................... 3-4
3.3 SPN 27/FMI 0/1/2/14 ............................................................................... 3-5
3.1 SPN 27/FMI 3
This diagnostic condition is typically a short to ground.
3.1.1 Short to Ground Check
Check for a short to ground as follows:

1. Disconnect the EGR valve connector.
2. Disconnect the MCM 120pin connector.
3. Measure the resistance from pin 4 of the EGR valve connector to ground.
[a] If the resistance is less than 5 , repair the short to ground in the wire between
pin 4 of the EGR valve connector and pin 60 of the MCM 120pin connector.
Refer to section 3.1.1.1.
[b] If the resistance is greater than 5 , measure the resistance again. If you receive the
same results, contact the Detroit Diesel Customer Support Center (3135925800).
3.1.1.1 Verify Repairs
Perform the following steps to verify repairs.

1. Turn the ignition OFF.
2. Reconnect all connectors. Turn ignition ON.
3. Clear codes with diagnostic tool.
4. Start and run the engine for one minute. Stop engine.
5. Check diagnostic tool for codes.
[a] If no codes are displayed, troubleshooting is complete.
[b] If SPN 27/3 is not logged and other codes are logged, troubleshoot the logged codes.
[c] If SPN 27/3 and other codes are logged, review this section to find the error. If no
error is found, call the Detroit Diesel Customer Support Center (3135925800).

3.2 SPN 27/FMI 4
3.2 SPN 27/FMI 4
This diagnostic condition is typically a short in the wires.
3.2.1 Short Circuit Check
Check for a short in the wires as follows:

3. Measure the resistance between pin 2 and pin 4 of the EGR valve connector.
[a] If the resistance is less than 5 , repair the short in wires between pins 2 and 4
of the EGR valve connector and pins 60 and 62 of the 120pin MCM connector.
[b] If the resistance is greater than 5 , repair the short to power in the wire between
pin 4 of the EGR valve connector and pin 60 of the 120pin MCM connector.

[b] If SPN 27/4 is not logged and other codes are logged, troubleshoot the logged codes.

3.3 SPN 27/FMI 0/1/2/14
This diagnostic condition is typically a valve plausibility error (the valve is not working properly).
3.3.1 Valve Function Check
Check the valve function as follows:

1. Turn the ignition ON.
2. Check for multiple codes. If other codes are present, service them first.
3. Disconnect the EGR valve electrical connector. Inspect the connector for corrosion, bent
or spread pins.
[a] If connector damage is found, repair as necessary. Refer to section 3.3.1.1.
[b] If there is no connector damage, go to step 4.
5. Reconnect the EGR valve electrical connector.
6. Connect diagnostic tool for DDEC VI.
8. Monitor the EGR valve actual position.
9. Does the EGR valve actual position read less than 3%?
[a] If yes, go to step 10.
[b] If no, go to step 14.
10. Command the EGR pulse width to 50%.
11. Does the EGR valve actual position read between 46% and 54%?
12. Command the EGR pulse width to 100%.
13. Does the EGR valve actual position read above 95%?
[a] If yes, repeat steps 3 through 13. If the results are the same, call the Detroit Diesel
Customer Support Center.
14. Remove the EGR valve.
15. Visually inspect the EGR valve for Physical damage or excessive carbon/sludge buildup.
[a] If the EGR valve is damaged, replace it. Refer to section 3.3.1.1.
[b] If excessive carbon/sludge buildup is found, replace the EGR valve and inspect the
EGR cooler for internal failure.

3.3 SPN 27/FMI 0/1/2/14

4. Start and run the engine for one minute. Stop the engine.
[b] If SPN 27/0/1/2/14 is not logged and other codes are logged, troubleshoot the logged
codes.
[c] If SPN 27/0/1/2/14 and other codes are logged, review this section to find the error. If
no error is found, call the Detroit Diesel Customer Support Center (3135925800).

4 SPN 84 VEHICLE SPEED SENSOR
Section Page
4.1 SPN 84/FMI 3 ........................................................................................... 4-3

4.2 SPN 84/FMI 4 ........................................................................................... 4-4
4.1 SPN 84/FMI 3
This diagnostic condition is typically VSS open circuit.
4.1.1 Open Circuit Check
Check for an open as follows:

1. Disconnect the VSS.
3. Measure the voltage between pins 1 and 2 of the VSS harness connector.
[a] If the voltage is between 4.5 and 5.5 volts, refer to section 4.1.2.
[b] If the voltage is less than 4.5 volts, go to step 4.
4. Measure the voltage between pin 1 of the VSS harness connector and a good ground..
[a] If the voltage is greater than 4.5 volts, repair the open wire between pin 14 of the
CPC #3 connector (21pin) and pin 2 of the VSS harness connector. Refer to section
4.1.2.1.
[b] If the voltage is less than 4.5 volts, repair the open wire between pin 13 of the CPC #3
connector (21pin) and pin 1 of the VSS harness connector. Refer to section 4.1.2.1.
Check the VSS circuit as follows:

2. Disconnect the CPC #3 connector (21pin).
3. Measure the resistance between
[a] If the resistance measurement is less than 5 , repair the short in the harness between
pin 13 and pin 14 of the CPC #3 connector (21pin). Refer to section 4.1.2.1.
[b] If the resistance measurement is greater than 5 , replace the VSS. Refer to section
4.1.2.1.


4.2 SPN 84/FMI 4

[b] If code 84/3 is not logged, and other codes are logged, troubleshoot the logged codes.
[c] If code 84/3 and other codes are logged, review this section to find the error. If no
4.2 SPN 84/FMI 4
This diagnostic condition is typically VSS short circuit.
Check for a short as follows:

1. Disconnect the VSS connector.
2. Disconnect the CPC #3 connector (21pin).
3. Measure the resistance between pin 1 and pin 2 of the VSS harness connector.
[a] If the resistance measurement is less than 5 , repair the short pin 13 and pin 14 of
the CPC #3 connector (21pin).Refer to section 4.2.1.1.
[b] If the resistance measurement is greater than 5 , go to step 4.
4. Measure the resistance between pin 1 of the VSS harness connector and ground.
[a] If the resistance measurement is less than 5 , repair the short to ground between
pin 13 of the CPC #3 connector (21pin) and pin 1 of the VSS harness connector.
[b] If the resistance measurement is greater than 5 , go to step 5.
5. Measure the resistance between pin 2 of the VSS harness connector and ground.
[a] If the resistance measurement is less than 5 , repair the short to ground between
pin 14 of the CPC #3 connector (21pin) and pin 2of the VSS harness connector.
[b] If the resistance measurement is greater than 5 , replace the VSS. Refer to section
4.2.1.1.




4.2 SPN 84/FMI 4

5 SPN 86 ADAPTIVE CRUISE CONTROL FAULT
Section Page
5.1 SPN 86/FMI 14 ......................................................................................... 5-3

5.1 SPN 86/FMI 14
If Eaton Smart Cruise is installed on the vehicle the parameter for Adaptive Cruise Control
must be enabled. This code appears if the parameter for Adaptive Cruise Control is enabled and
the vehicle is not equipped with Eaton Smart Cruise.

5.1 SPN 86/FMI 14

6 SPN 91 ACCELERATOR PEDAL SENSOR FAULT
Section Page
6.1 SPN 91/FMI 2 ........................................................................................... 6-3

6.2 SPN 91/FMI 3 ........................................................................................... 6-4
6.3 SPN 91/FMI 4 ........................................................................................... 6-6
6.1 SPN 91/FMI 2
A typical diagnosis for the fault is erratic data.
6.1.1 Erratic Data Check
Check for erratic data as follows:

1. Disconnect the Accelerator Pedal (AP).
3. Measure the voltage between pins 1 and 3 of the AP harness connector.
[a] If the voltage is between 4.5 and 5.5 volts, go to step 5.
[b] If the voltage is less than 4.5, go to step 4.
4. Measure the voltage between pins 1 of the AP harness connector and ground.
[a] If the voltage is between 4.5 and 5.5 volts, repair the open circuit between pin 3
of the AP harness connector and pin 4 of the CPC #1 connector. See Figure 6-1.
[b] If the voltage is less than 4.5, repair the open circuit between pin 1 of the AP harness
connector and pin 8 of the CPC #1 connector. See Figure 6-1. Refer to section 6.1.1.1.
Figure 6-1 Accelerator Pedal Assembly Installation
5. Turn the ignition switch to the OFF position.

6. Disconnect the CPC #1 connector.

6.2 SPN 91/FMI 3
7. Measure the resistance between pin 2 of the AP harness connector and pin 7 of the CPC
#1 connector.
[a] Measure the resistance between pin 2 of the AP harness connector and pin 7 of the
CPC #1 connector. Refer to section 6.1.1.1.
[b] If the resistance is less than 3 , replace the Accelerator Pedal. Refer to section
6.1.1.1.

6.2 SPN 91/FMI 3
The typical diagnosis for this fault is high voltage.
6.2.1 High Voltage Check
heck for high voltage as follows:

[b] If the voltage is less than 4.5, 4.
of the AP harness connector and pin 4 of the CPC #1 connector. See Figure 6-2.

connector and pin 8 of the CPC #1 connector. See Figure 6-2. Refer to section 6.2.1.1.

#1 connector.
6.2.1.1.


6.3 SPN 91/FMI 4
6.3 SPN 91/FMI 4
The typical diagnosis for this fault is voltage low.
6.3.1 Low Voltage Check
Perform the following steps to troubleshoot low voltage.

1. Disconnect the Accelerator Pedal (AP) connector.
3. Measure the resistance between pin 1 and pin 3 of the AP connector.
[a] If the resistance is less than 5 , repair the short between wires 8 and 4 of the CPC
#1 connector. See Figure 6-3. Refer to section 6.3.1.1.
[b] If the resistance is greater than 5 , go to step 4.
4. Measure the resistance between pin 2 and 3 of the AP connector.

#1 connector. Refer to section 6.3.1.1.

5. Measure the resistance between pin 1 of the AP connector and ground.

[a] If the resistance is less than 5 , repair the short circuit between pin 1 of the AP
connector and ground. Refer to section 6.3.1.1.
[b] If the resistance is greater than 5 , replace the Accelerator Pedal. Refer to section
6.3.1.1.


6.3 SPN 91/FMI 4

7 SPN 100 ENGINE OIL PRESSURE OUTSIDE
Section Page
7.1 SPN 100/FMI 1 ......................................................................................... 7-3

7.2 SPN 100/FMI 2 ......................................................................................... 7-5
7.3 SPN 100/FMI 3 ......................................................................................... 7-6
7.4 SPN 100/FMI 4 ......................................................................................... 7-8
7.5 SPN 100/FMI 14 ....................................................................................... 7-10
7.1 SPN 100/FMI 1
SPN 100/FMI 1 is typically low engine oil pressure.

The following procedures will troubleshoot SPN 100.
7.1.1 Low Oil Pressure Check
Perform the following steps to troubleshoot a low oil pressure fault code:
2. Check for multiple codes.
[a] If fault codes 100/1 and 100/3 are both active, refer to section 7.4.2.
[b] If fault codes 100/1 and 100/4 are both active, refer to section 7.3.1
[c] If only fault code 100/1 is active, go to step 3.
3. Observe the stability of the oil pressure.
[a] If the oil pressure is in normal operating range and stable, go to step 4.
[b] If the oil pressure is fluctuating, go to step 5.
4. Check the oil level.
NOTE:
An increase in the engine oil level indicates fuel may be leaking into the engine oil.
[a] If the oil level is high, check for fuel entering into the engine oil system and repair as
required. Change the engine oil. Refer to section 7.1.1.1.
[b] If the engine oil level is low, fill oil to proper level. Refer to section 7.1.1.1.
5. Check the operation of the oil gage.
[a] If the oil gage readings are erratic, repair or replace the oil gage as
required.Refer to section 7.1.1.1.
[b] If the oil gage readings are fine, go to step 6.
6. Check the condition of the oil pump suction pipe.
[a] If the pipe is loose or cracked, replace a cracked pipe and reinstall a loose pipe.
[b] If there is no problem with the oil pump suction pipe, go to step 7.
7. Check the condition of the oil pump drive and driven gears.
[a] If either gear is loose, repair or replace loose gears as required. Refer to section
7.1.1.1.
[b] If neither gear is loose, go to step 8.
8. Check for a faulty oil pressure relief valve.

7.1 SPN 100/FMI 1
[a] If the relief valve does not open at the set pressure or sticks open, repair or replace a
faulty oil pressure relief valve as required. Refer to section 7.1.1.1.
[b] If the relief valve is fine, refer to section 7.1.1.1.

2. Reconnect all connectors.
3. Turn ignition ON.
5. Start and run the engine for one minute.
6. Stop engine.

7.2 SPN 100/FMI 2
The diagnosis for this code is typically erratic data from the Engine Oil Pressure Sensor.
7.2.1 Erratic Data From the Engine Oil Pressure Sensor Check
Check for erratic data from the Engine Oil Pressure Sensor as follows:
1. With the engine shut down, all oil drained into the oil pan, and the vehicle on a level
surface, check the oil level.
[a] If the oil level is not within the normal operating range on the dipstick, add the
recommended oil to bring it to the proper level. Refer to section 7.2.1.1.
[b] If the oil level is within the normal operating range on the dipstick, go to step 2.
2. Check for additional active fault codes.
[a] If fault code 100/3 is active in addition to code 100/2, refer to section 7.4.2.
[b] If fault code 100/4 is active in addition to code 100/2, refer to section 7.3.1.
[c] If only fault code 100/2 is active, check and clean sensor contacts (remove any
corrosion). Refer to section 7.2.1.1.

6. Stop engine.

7.3 SPN 100/FMI 3
7.3 SPN 100/FMI 3
This diagnosis is typically an Engine Oil Pressure Sensor short-to-power fault. Perform the
following steps to troubleshoot an Engine Oil Pressure Sensor short-to-power fault.
7.3.1 Short to Power Check

[a] If 100/3, 175/3, 1172/3 and 1176/3 are present, repair the open between pin 105 of
the 120pin connector and the associated sensors. Refer to section 7.3.1.1.
[b] If 100/3 and 175/3 are present, go to step 7.
[c] If only 100/3 is present, go to step 4.
4. Disconnect the Engine Oil Pressure/Temp Sensor.
5. Disconnect the 120pin MCM connector.
6. Measure the resistance between pins 3 and 4 of the combination sensor harness connector.
[a] If resistance is less than 5 , repair short circuit between 120-pin MCM connector
wires 54 and 82. Refer to section 7.3.1.1.
[b] If resistance is greater than 5 , repair the short to power on the circuit between pin
54 of the 120pin MCM connector and pin 4 of the Engine Oil Pressure/Temp Sensor
harness connector. See Figure 7-1. Refer to section 7.3.1.1.
8. Measure the resistance between pin 1 and 3 of the Engine Oil Pressure/Temp Sensor.
[a] If resistance is less than 140 , go to step 9.
[b] If resistance is greater than 140 , replace the sensor. Refer to section 7.3.1.1.
10. Measure the voltage between pin 3 of the combination sensor and ground.

[a] If the voltage is less than 2.75 volts, repair the open circuit between pin 82 of
the 120pin MCM connector and pin 3 of the Engine Oil Pressure/Temp Sensor.
See Figure 7-1. Refer to section 7.3.1.1.
Figure 7-1 Engine Oil Pressure/Temp Sensor
[b] If the voltage is less than 2.75 volts, repair the open circuit between pin 105 of


7.4 SPN 100/FMI 4
7.4 SPN 100/FMI 4
A typical diagnosis is an Engine Oil Pressure Sensor open short to ground.
7.4.1 Multiple Code Check
Check for multiple codes as follows:

2. Plug in diagnostic tool and check for multiple codes.
[a] If 175/4 and 3480/4 are present with 100/4, repair the open between pin 82 of the
MCM 120pin connector and the associated sensors. Refer to section 7.4.2.1.
[b] If 175/4 is present with 100/4, repair the open between pin 82 of the MCM 120pin
connector and pin 3 of the Engine Oil Temperature/Pressure Sensor. Refer to section
7.4.2.1.
3. If only 100/4 is present, refer to section 7.4.2.
7.4.2 Open Short to Ground Check
Check for an Engine Oil Temperature/Pressure Sensor open short to ground as follows:
1. Disconnect the Engine Oil Temperature/Pressure Sensor.
2. Measure the resistance between pins 1 and 3 of the Engine Oil Temperature/Pressure
Sensor.
[a] If the resistance is greater than 130k , replace the Engine Oil Temperature/Pressure
Sensor. Refer to section 7.4.2.1.
[b] If the resistance is less than 130k , go to step 3.
3. Measure the resistance between pins 1 and 4 of the combination sensor.
[a] If the resistance is greater than 130k , replace the sensor. Refer to section 7.4.2.1.
5. Measure the resistance between pins 1 and 4 of the sensor harness connector.
[a] If the resistance is greater than 5 , go to step 6.
[b] If the resistance is less than 5 , repair the short between wires 105 and 54 of the
MCM 120pin connector. Refer to section 7.4.2.1.
6. Measure the resistance between pin 4 of the sensor harness connector and ground.
[a] If the resistance is greater than 5 , repair the open between pin 4 of the sensor and
pin 54 of the MCM 120pin connector. See Figure 7-2. Refer to section 7.4.2.1.

[b] If the resistance is less than 5 , repair the short to ground circuit between pin 54 of
the MCM 120pin connector and ground. See Figure 7-2. Refer to section 7.4.2.1.
Figure 7-2 Engine Oil Temperature/Pressure Sensor

6. Stop engine.

7.5 SPN 100/FMI 14
7.5 SPN 100/FMI 14
This diagnosis is typically oil pressure very low. Perform the following steps to troubleshoot an
oil pressure very low fault

2. Check for additional active fault codes.
[a] If fault code 100/3 is active in addition to code 100/14, refer to section 7.4.2.
[b] If fault code 100 /4 is active in addition to code 100/14, refer to section 7.3.1.
3. If only fault code 100/14 is active, refer to section 7.5.2.
7.5.2 Oil Pressure, Oil Pump and Oil Gauges Check
Check as follows
1. Start engine and check oil pressure.
[a] If pressure is fluctuating, go to step 2.
[b] If pressure is low but stable, go to step 3.
2. Stop the engine and allow sufficient time for the oil to drain into the oil pan. Perform
the following steps:
[a] Check the oil level. Add recommended oil to bring it to the proper level, if required.
[b] Check for faulty oil gage. Replace, if required.
[c] Check for loose or cracked oil pump suction pipe. Repair or replace, as required.
[d] Check for loose drive or driven oil pump gear. Repair or replace, as required.
[e] Check for faulty oil pressure relief valve. Repair or replace, as required.
[f] Refer to section 7.5.2.1
3. Stop the engine and allow sufficient time for the oil to drain into the oil pan. Check the
oil level.
[a] If oil is above maximum level with no oil previously added, go to step 4.
[b] If oil is not above maximum level, contact Detroit Diesel Customer Support Center
(3135925800).
4. Check for possible fuel in oil.
[a] If fuel is found, locate and repair source of fuel leak. Change the oil. Refer to section
7.5.2.1.
[b] If fuel is not found, contact Detroit Diesel Customer Support Center (3135925800).


6. Stop engine.
[b] If code 100/14 is not logged, and other codes are logged, troubleshoot the logged
codes.

7.5 SPN 100/FMI 14

8 SPN 103 TURBO NO REVOLUTION
Section Page
8.1 SPN 103/FMI 0 ......................................................................................... 8-3

8.2 SPN 103/FMI 1 ......................................................................................... 8-4
8.3 SPN 103/FMI 3 ......................................................................................... 8-5
8.4 SPN 103/FMI 4 ......................................................................................... 8-7
8.5 SPN 103/FMI 7 ......................................................................................... 8-9
8.1 SPN 103/FMI 0
This diagnosis is typically turbocharger speed above threshold.
8.1.1 Equipment Check
Check equipment as follows:

1. Disconnect the Turbo Speed Sensor.
2. Measure the resistance across pins 1 and 2 of the Turbo Speed Sensor.
[a] If the resistance is 0 or greater than 1k , replace the Turbo Speed Sensor.
3. Visually inspect the turbocharger for damage.
[a] If damage is found, repair as necessary. When the repairs are done, refer to section
8.1.1.1.
[b] If no visible damage is found, go to step 4.
4. Using Artisan, perform the turbocharger self test.
[a] If the self test fails, repair the turbo/actuator as necessary. When the repairs are
done, refer to section 8.1.1.1.
[b] If the self test results are satisfactory, go to step 5.
5. Perform the fuel pressure test.
[a] If the fuel pressure is not within specifications, repair the fuel system as necessary.
When the repairs are done, refer to section 8.1.1.1.
[b] If the fuel pressure is within specifications, contact the Detroit Diesel Customer
Support Center (3135925800).

8.2 SPN 103/FMI 1

8.2 SPN 103/FMI 1
This diagnosis is typically turbocharger speed below threshold
8.2.1 Equipment Check
Check equipment as follows:

1. Disconnect the Turbo Speed Sensor.
2. Measure the resistance across pins 1 and 2 of the Turbo Speed Sensor.
[a] If the resistance is 0 or greater than 1k , replace the Turbo Speed Sensor.
3. Visually inspect the turbocharger for damage.
[a] If damage is found, repair as necessary. When the repairs are done, refer to section
8.2.1.1.
[b] If no visible damage is found, go to step 4.
4. Using Artisan, perform the turbocharger self test.
[a] If the self test fails, repair the turbo/actuator as necessary. When the repairs are
done, refer to section 8.2.1.1.
[b] If the self test results are satisfactory, go to step 5.
5. Perform the engine oil pressure.
[a] If the fuel pressure is not within specifications, repair the lubrication system as
necessary. When the repairs are done, refer to section 8.2.1.1.

[b] If the oil pressure is within specifications, contact the Detroit Diesel Customer

8.3 SPN 103/FMI 3
This diagnosis is typically circuit failed high (open circuit).

1. Disconnect the Turbo Speed Sensor (TSS).
2. Measure the resistance across pins 1 and 2 of the sensor (see Figure 8-1).
[a] If the resistance is greater than 1k , replace the sensor. Refer to section 8.3.2.1.
3. Turn the ignition switch to the ON position.
4. Measure the voltage between pins 1 and 2 of the TSS harness connector.
[a] If the voltage is between 4.5 and 5.5 volts, refer to section 8.3.2.
5. Measure the voltage between pin 2 of the TSS harness connector and ground.
[a] If the voltage is between 4.5 and 5.5 volts, repair the open circuit between pin 1 of
the TSS harness connector and pin 50 of the 120pin MCM connector. See Figure
8-1. Refer to section 8.3.2.1.

8.3 SPN 103/FMI 3
[b] If the voltage is less than 4.5 volts, repair the open circuit between pin 2 of the
TSS harness connector and pin 51 of the 120pin MCM connector. See Figure
Figure 8-1 Turbo Speed Sensor Terminal and Wire Locations
8.3.2 Resistance and Voltage Check
The resistance and voltage check performed indicate that you should not be getting a code. The
following is a recheck before requesting a new MCM.
2. Reconnect the TSS.
3. Clear codes. Run engine for one minute. Stop engine.
4. Recheck codes.
[a] If there are no codes, troubleshooting is finished.
[b] If code 103/ 3 is logged, go to step 5.
6. Measure the resistance across pins 1 and 2 of the sensor.
[a] If the resistance is greater than 1.1k , replace the sensor. Refer to section 8.3.2.1.
[b] If the resistance is less than 1.1k , go to step 7.
8. Measure the voltage between pins 1 and 2 of the TSS harness connector.

[a] If the voltage is between 4.5 and 5.5 volts, contact the Detroit Diesel Customer
Support Center (3135925800) for authorization to replace the MCM.
[b] If the voltage is less than 4.5 volts, refer to section 8.3.1, step 5.

1. Turn vehicle ignition OFF.
8.4 SPN 103/FMI 4
This diagnosis is typically short to ground.
Check for short as follows:

3. Measure the resistance across pins 1 and 2 of the TSS connector.
[a] If the resistance is less than 5 , repair the short between the 120pin MCM
connector wires 50 and 51. Refer to section 8.4.2.1.
4. Measure the resistance between pin 1 of the TSS harness connector and ground.
[a] If the resistance is less than 5 , repair the short between pin 1 of the TSS harness

8.4 SPN 103/FMI 4
[b] If the resistance is greater than 5 , refer to section 8.4.2.1.
8.4.2 Resistance Check
The resistance checks performed in the previous section indicated that you should not be getting a
code. The following is a recheck before requesting a new MCM.
4. Recheck codes.
[a] If there are no codes, troubleshooting is finished.
[b] If code 103/4 is logged, go to step 5.
5. Disconnect the TSS and the 120pin MCM connector.
6. Measure the resistance across pins 1 and 2 of the TSS connector.
[a] If the resistance is less than 5 , repair the short between the 120pin MCM
connector wires 50 and 51. Refer to section 8.4.2.1.
[b] If the resistance is greater than 5 , contact the Detroit Diesel Customer Support
Center (3135925800) for authorization to replace the MCM.


8.5 SPN 103/FMI 7
Certain engines equipped with a turbo brake require turbo speed monitoring during the braking
mode in order to control engine brake power. The speed is controlled through the TSS installed
on the turbo shaft housing. SPN 103 (SPN 103/FMI 7) is logged when the MCM on the engine
fails to receive the monitoring signal from the sensor.
There are two possible causes for this fault code:
Failed sensor.
Sensor too close to the turbo shaft (not enough air gap).
8.5.1 Turbo Speed Sensor Check
Troubleshoot a Turbo No Revolution fault as follows:

1. With the engine stopped and at ambient temperature, unplug the TSS from the TSS
connector.
2. Measure the resistance between the sensor terminals.
[a] If resistance is approximately 900 , refer to section 8.5.2.
[b] If resistance is zero or higher than 950 , replace the sensor. Refer to section 8.5.2.1.
8.5.2 Adjust the Turbo Speed Sensor Air Gap
Adjust the TSS air gap a follows:

1. Remove the TSS from the turbo shaft housing.
2. Adjust the air gap by adding a 0.020 in. washer between the sensor body and the housing.
3. Install the sensor into the turbo shaft housing. Refer to section 8.5.2.1.


8.5 SPN 103/FMI 7

9 SPN 110 COOLANT TEMPERATURE ABOVE OR
BELOW NORMAL OPERATING RANGE
Section Page
9.1 SPN 110/FMI 0 ......................................................................................... 9-3

9.2 SPN 110/FMI 2 ......................................................................................... 9-4
9.3 SPN 110/FMI 3 ........................................................................................ 9-5
9.4 SPN 110/FMI 4 ......................................................................................... 9-7
9.5 SPN 110/FMI 14 ....................................................................................... 9-9
9.1 SPN 110/FMI 0
The diagnostic condition is typically engine coolant temperature high.
Perform the following steps to check for multiple codes

2. Plug in the diagnostic tool.
3. Read active codes.
[a] If fault 110/3 is active in addition to 110/0, refer to section 9.3.
[b] If fault 110/4 is active in addition to 110/0, refer to section 9.4.
[c] If fault 111/1 is active in addition to 110/0, refer to section 10.1.
[d] If only fault code 110/0 is active, refer to section 9.1.2.
9.1.2 System Checks to Resolve Fault
Perform the following steps to resolve a coolant temperature high fault. Repair or replace, as
required.
1. Check for coolant loss.
2. Check for blockage in radiator and charge air cooler.
3. Check fan belt condition (slippage).
4. Check for proper location of fan shroud.
5. Check for proper radiator hose condition (no collapsed hoses).
6. Check for proper viscous fan operation.
7. Once checks and repairs are finished, refer to section 9.1.2.1.

1. Turn vehicle ignition OFF and reconnect all connectors.
2. Turn vehicle ignition ON. Clear the codes.
3. Start and run the engine for eight minutes. Stop the engine.
4. Check for codes.
[a] If no codes are logged, troubleshooting is complete.
[b] If other codes are logged, review this section to find the error. If no error is found,
contact Detroit Diesel Customer Support Center (3135925800).

9.3 SPN 110/FMI 3
9.2 SPN 110/FMI 2
This condition is typically coolant temperature out of range (drifted low/high).
NOTE:
When diagnosing rationality erratic data faults (FMI 2) always refer to SILs or SIBs for
any known issues first.
9.2.1 Rationality Check for Temperature Drift
Troubleshoot SPN 110/2 as follows:

1. Check cooling system integrity (lack of heat complaints).
2. Connect the diagnostic tool and monitor the engine oil temperature and the engine coolant
temperature.
3. With the engine running at idle and the engine oil temperature above 160, is the coolant
temperature within X degrees of the oil temperature?
[b] If no, disconnect the ECT Sensor and the MCM connector. Bridge pins X and
X of the sensor, measure the resistance at the MCM between pins X and X. If the
resistance is greater than 3 , repair the harness. If the resistance is less than 3 ,
replace the sensor. Refer to section 9.2.1.1.
4. With the engine running at 1500 rpm and oil temperature above 160, check the coolant
temperature. Is it within X degrees of the oil temperature?
[a] If yes, contact the Detroit Diesel Customer Support Center (3135925800).
[b] If no, disconnect the ECT Sensor and the MCM connector. Bridge pins X and
X of the sensor and measure resistance at the MCM between pins X and X. If the
resistance is greater than 3 repair the harness. If the resistance is less than 3 ,
replace the sensor. Refer to section 9.2.1.1.

4. Check for codes.

9.3 SPN 110/FMI 3
SPN 110/FMI 3 indicates that the Engine Coolant Temperature Sensor (ECT Sensor) input to
the MCM has exceeded 95% of the sensor supply voltage. The diagnostic condition is typically
engine coolant temperature open circuit (110/3).

3. Read the active codes.
[a] If codes 110/3, 174/3 and 175/3 are active at the same time, repair the open circuit
between pin 73 of the 120pin MCM connector and pin 1 of the ECT Sensor, the
EOT Sensor and the Supply Fuel Temperature Sensor. Refer to section 9.3.2.1.
[b] If only fault 110/3 is active, refer to section 9.3.2.
Perform the following steps to troubleshoot an ECT Sensor open circuit fault:
1. Disconnect the ECT Sensor.
2. Measure the resistance across pins 1 and 2 of the ECT Sesnor.
[a] If the resistance is greater than 4 k, replace the sensor. Refer to section 9.3.2.1.
[b] If the resistance is less than 4 k, go to step 3.
4. Measure the voltage between pins 1 and 2 of the ECT Sensor harness connector.
5. Measure the voltage between pin 2 of the ECT Sensor harness connector and ground.
of the ECT Sensor harness connector and pin 73 of the 120pin MCM connector
(see Figure 9-1). Refer to section 9.3.2.1.

9.3 SPN 110/FMI 3
[b] If the voltage is less than 2.75 volts, repair the open circuit between pin 2 of the ECT
Sensor harness connector and pin 110 of the 120pin MCM connector (see Figure
9-1). Refer to section 9.3.2.1.
Figure 9-1 Engine Coolant Temperature Sensor
6. Disconnect the 120pin MCM connector. Measure the resistance between pins 1 and
2 of the ECT Sensor harness connector.
[a] If the resistance is greater than 5 , replace the ECT Sensor. Refer to section 9.3.2.1.
[b] If the resistance is less than 5 , repair the short between pins 73 and 110 of the
120pin MCM connector. Refer to section 9.3.2.1.

1. Turn the ignition OFF and reconnect all connectors.
2. Turn the ignition ON. Clear the codes.
4. Check for codes.
[b] If code 110/3 or 110/4 and any other codes are logged, review this section to find
the error. If no error is found, contact Detroit Diesel Customer Support Center
(3135925800) for authorization to replace the MCM. Set parameters on the new
MCM.

9.4 SPN 110/FMI 4
The diagnostic condition is typically engine coolant temperature short to ground.
Perform the following steps to troubleshoot an ECT Sensor short-to-ground fault.

1. Disconnect the ECT Sensor.
3. Measure the resistance across pins 1 and 2 of the ECT Sensor connector. See Figure 9-2.
Figure 9-2 Engine Coolant Temperature Sensor
[a] If resistance is greater than 5 , go to step 4.

[b] If resistance is less than 5 , repair short to ground between pins 73 and 110 of the
120-pin MCM connector. Refer to section 9.4.1.1.
4. Measure the resistance between pin 1 of the ECT Sensor harness connector and ground.
[a] If resistance is greater than 5 , go to step 5.
[b] If resistance is less than 5 , repair the short circuit pin 1 of the ECT Sensor harness
5. Measure the resistance between pin 2 of the ECT Sensor harness connector and ground.
[a] If resistance is greater than 5 , repeat steps 3 through 5. If the results are the same,
call the Detroit Diesel Customer Support Center (3135925800).
[b] If resistance is less than 5 , repair the short circuit between pin 2 of the ECT Sensor
harness connector and ground. Refer to section 9.4.1.1.

9.4 SPN 110/FMI 4

4. Check for codes.
[b] If code 110/3 or 110/4 and any other codes are logged, review this section to find
the error. If no error is found, contact Detroit Diesel Customer Support Center
MCM.

9.5 SPN 110/FMI 14
The diagnostic condition is typically engine coolant temperature very high.
Perform the following steps to troubleshoot an engine coolant temperature very high fault.
1. Turn the ignition switch ON.
2. Plug in the Diagnostic Data Reader (DDR).
3. Read active codes:
[a] If only fault code 110/14 is active, refer to section 9.5.2.
[b] If fault code 110/3 is active in addition to fault code 110/14, refer to section 9.3.2.
[c] If fault code 110/4 is active in addition to fault code 110/14, refer to section 9.4.1.
9.5.2 System Checks to Resolve Fault
Perform the following checks and any corrections necessary to resolve a coolant temperature
very high fault. Repair or replace, as required.
1. Check for coolant loss.
2. Check for blockage in radiator and charge air cooler.
3. Check fan belt condition (slippage).
4. Check for proper location of fan shroud.
5. Check for proper radiator hose condition (no collapsed hoses).
6. Check for proper viscous fan operation.
7. Once checks and repairs are finished, refer to section 9.5.2.1.

4. Check for codes.

9.5 SPN 110/FMI 14

10 SPN 111 COOLANT LEVEL OUTSIDE NORMAL
OPERATING RANGE
Section Page
10.1 SPN 111/FMI 1 ......................................................................................... 10-5

10.2 SPN 111/FMI 3 ......................................................................................... 10-7
10.3 SPN 111/FMI 4 ......................................................................................... 10-9

10.1 SPN 111/FMI 1
Perform the following steps to troubleshoot 111/1:
10.1.1 Coolant Level Check

[a] If other faults are active in addition to fault 111/1, troubleshoot the other faults first.
[b] If only fault 111/1 is active, go to step 3.
3. Check the coolant level in the reservoir. See Figure 10-1.
Figure 10-1 Engine Coolant Level Sensor Mounted in Radiator Top Tank
[a] If the coolant level in the reservoir is not within limit, refer to section 10.1.2.

10.1 SPN 111/FMI 1
[b] If the coolant level in the reservoir is within limit, replace the sensor (see Figure
10-2). Refer to section 10.1.2.1.
10.1.2 Coolant Leak or Faulty Radiator Cap Check
Perform the following steps to resolve a coolant level low fault. Repair as required.
1. Check for coolant leak at cylinder head gasket.
2. Check for coolant leak at air compressor head gasket.
3. Check for external coolant leak at hose connections.
4. Check for coolant in oil.
5. Check for loose or faulty radiator cap.
6. When these checks and subsequent repairs are finished, Refer to section 10.1.2.1.

Perform the following steps to test the repair:

1. Connect all the removed connectors.
2. Start and run the engine for 5 minutes.
[a] If no codes display, the repairs are complete.
[b] If code 111/1 displays, review these steps to find the error. If you cannot find the
error, call the Detroit Diesel Customer Support Center (3135925800).
[c] If any codes other than code 111/1 display, troubleshoot those codes.
10.2 SPN 111/FMI 3
This condition is typically an open circuit fault.
10.2.1 Multiple Codes Check
Perform the following steps to check for multiple codes:

2. Read the diagnostic codes displayed.
Perform the following steps to troubleshoot an ECL Sensor open circuit fault:

10.2 SPN 111/FMI 3
1. Check the voltage between the CPC #3 connector (21-pin ) wire 3/11 on the ECL Sensor.
See Figure 10-3.
[a] If voltage is about 5 volts, replace ECL sensor. Refer to section 10.2.2.1.
[b] If voltage is the same as battery voltage, repair short to wire in ECL Sensor wire
3/11. Refer to section 10.2.2.1.
[c] If voltage is 0 volts, go to step 2.
2. Bridge wire 3/11 to battery ground.
[a] If fault 111/3 is active, repair open circuit in ECL Sensor wire 3/11. Refer to section
10.2.2.1.
[b] If fault 111/4 is active, repair open circuit in ECL Sensor wire 3/2. Refer to section
10.2.2.1.


10.3 SPN 111/FMI 4
This fault is typically a short to ground. Perform the following steps to troubleshoot.
Perform the following steps to check for multiple codes:

2. Read the diagnostic codes displayed.

10.3 SPN 111/FMI 4
1. Disconnect the ECL Sensor. See Figure 10-4.
[a] If fault 111/4 is not active after disconnecting the sensor, replace the ECL Sensor.
[b] If fault 111/4 is active after disconnecting the sensor, go to step 2.
2. Disconnect the #3 connector (21-pin).
3. Measure the resistance across pins 1 and 2 of the ECL Sensor connector.
[a] If the resistance is less than 5 , repair the short between the wires 2 and 11 of the
4. Measure the resistance between pin 1 of the ECL Sensor harness connector and ground.
[a] If the resistance is less than 5 , repair the short circuit between pin 1 of the ECL
Sensor harness connector and ground. Refer to section 10.3.2.1.


5. Measure the resistance between pin 2 of the ECL Sensor harness connector and ground.
[a] If the resistance is less than 5 , repair the short circuit between pin 2 of the ECL
Sensor harness connector and ground. Refer to section 10.3.2.1.
[b] If the resistance is greater than 5 , review steps 10.3.2.1 through 5. If the results are
the same, call the Detroit Diesel Customer Support Center (3135925800).


10.3 SPN 111/FMI 4

11 SPN 158 BATTERY CHARGING FAULT
Section Page
11.1 SPN 158/FMI 0 ......................................................................................... 11-3

11.2 SPN 158/FMI 1 ......................................................................................... 11-4
11.3 SPN 158/FMI 2 ......................................................................................... 11-6
11.1 SPN 158/FMI 0
The diagnostic condition is typically high system voltage.
11.1.1 Battery High Voltage Check
Check for high voltage as follows:

1. Start the engine and rev at rated speed.
2. Measure the voltage across the battery terminals. .
[a] If the voltage is greater than 16 V, troubleshoot the charging system for an
overvoltage condition. Refer to the OEM Vehicle Manual.
[b] If the voltage is between 16 and 11.0 V and fault code 158/0 is still active, replace the
MCM. Refer to section 11.1.1.1.


11.2 SPN 158/FMI 1
11.2 SPN 158/FMI 1
The diagnostic condition is typically low system voltage.
11.2.1 Battery Voltage Switched Low
Check for low voltage as follows:

2. Measure the voltage across the battery terminals. See Figure 11-1.
Figure 11-1 Power Wiring
[a] If the voltage is less than 11.0 V, troubleshoot the battery, starting, and charging
system for an under voltage condition. Refer to the OEM Vehicle Manual.
[b] If the voltage is not less than 11.0 V, go to step 3.

3. Measure the voltage between pins 2/2 and 2/3 of the CPC #2 connector (18-pin).
See Figure 11-1.
[a] If the voltage is between 11.0 and 16 V, replace the CPC. Refer to section 11.2.1.1.
[b] If the voltage is 16 V, go to step 4.
4. Start and run the engine. Measure the voltage drop between pin 2/3 of the CPC #2
connector and the positive battery terminal.
[a] If the voltage was less than 11.0 V (ignition on and engine not running) and voltage
drop between pin 2/3 of the CPC #2 connector and the positive battery terminal
is greater than 0.5 V (engine running), replace or repair the supply side wires and
connectors between pin 2/3 of the CPC #2 connector and battery. Refer to section
11.2.1.1.
[b] If the voltage was not less than 11.0 V (ignition on and engine not running) and the
voltage drop was not greater than 0.5 V, go to step 5.
5. With the engine still running, measure the voltage drop between pin 2/3 of the CPC #2
connector and the negative battery terminal.
[a] If the voltage is less than 11.0 V and voltage drop between pin 2/3 of the CPC #2
connector and the negative battery terminal is greater than 0.5 V, replace or repair
the ground side wires and connectors between pin 2/3 of the CPC #2 connector and
battery ground. Refer to section 11.2.1.1.
[b] If the voltage is less than 11.0 V and voltage drop between pin 2/3 of the CPC #2
connector and the negative battery terminal is less than 0.5 V, contact the Detroit
Diesel Customer Support Center (3135925800).


11.3 SPN 158/FMI 2
11.3 SPN 158/FMI 2
This diagnostic is typically unmatched MCM and CPC signals.
Check MCM and CPC signals as follows:

1. Turn the the switch ON.
2. Plug in your diagnostic tool.
3. Check for active codes.
[a] If fault codes 158/2 and 168/0 are both still active, refer to section 12.1.
[b] If fault codes 158/2 and 158/1 are both still active, refer to section 11.2.1
[c] If fault codes 158/2 and 158/0 are both still active, refer to section 11.1.1.
[d] If fault codes 158/2 and 168/1 are both still active, refer to section 12.2.
11.3.2 MCM and CPC Signals Check
Check MCM and CPC signals as follows:

1. Measure the difference in voltage inputs between the CPC and the MCM. See Figure 11-2.
[a] If the voltage difference is less than 1.0 V, contact the Detroit Diesel Customer
[b] If the voltage difference is greater than 1.0 V with the CPC indicating the low
voltage, go to step 2.

[c] If the voltage difference is greater than 1.0 V with the MCM indicating the low
voltage, go to step 3.
2. Replace or repair the bad contacts and/or voltage supply for pins 2/3 (ignition) and 2/2
(ground) of the CPC #2 connector. Refer to section 11.3.2.1.
3. Replace or repair the bad contacts and/or voltage supply for pin M21/7 (power) and
pins M21/5, M21/6, M21/8, and M21/9 (ground) on the MCM 21-pin connector.

11.3 SPN 158/FMI 2


12 SPN 168 BATTERY VOLTAGE OUTSIDE NORMAL
OPERATING RANGE
Section Page
12.1 SPN 168/FMI 0 ......................................................................................... 12-3

12.2 SPN 168/FMI 1 ......................................................................................... 12-4
12.1 SPN 168/FMI 0
SPN 168/FMI 0 is a battery voltage high fault.
12.1.1 Measure Battery Voltage
Measure the battery voltage as follows:

1. Measure battery voltage with the engine running at maximum rpm.
2. If greater than 16 volts, check for proper alternator operation and repair or replace, as
required. Refer to section 12.1.1.1.
Verify repairs as follows:

2. Turn the ignition ON, and clear codes.
4. Check for codes
[a] If no codes are present, troubleshooting is complete.
[b] If code 168/0 is not logged but other codes are logged, troubleshoot the other codes.
[c] If code 168/0 and other codes are logged repeat troubleshooting procedure. If no
error is found, contact the Detroit Diesel Customer Support Center (3135925800).

12.2 SPN 168/FMI 1
12.2 SPN 168/FMI 1
SPN 168/FMI 1 is a battery voltage low fault.
12.2.1 Check the Alternator and the Battery
Check the alternator and battery as follows:

1. Check the condition of the alternator drive belt and replace, if required.
[a] If fault is no longer active, refer to section 12.2.2.1.
[b] If fault is still active, go to step 2.
2. Check for loose alternator mounting and retighten or repair, as required.
3. Check for proper alternator operation and repair or replace, as required.
[a] If fault is no longer active, erase fault code memory.
4. Check the condition of the battery (does it hold the charge?) and replace, if required.
12.2.2 Measure the Resistance
Measure the resistance as follows:

1. Measure the resistance of the individual wires in the ground circuit (MCM 21/5, 21/6,
21/8, 21/9 and CPC 2/2). See Figure 12-1.
[a] If resistance is greater than 0.5 in any wire, repair or replace the wire and
connector.Refer to section 12.2.2.1.

[b] If resistance is less than 0.5 in all wires, go to step 2.
2. Measure the resistance of the individual wires in the power circuit (MCM 21/11, 21/12,
21/14, 21/15 and CPC 2/1) with the engine running and battery voltage greater than 12.5
V. See Figure 12-1.
[a] If resistance is greater than 0.5 in any wire, repair or replace the power circuit
wires and connector. Refer to section 12.2.2.1.
[b] If resistance is less than 0.5 in any wire, go to step 3.
3. Measure the current drop of the individual wires in the ground circuit (MCM 21/5, 21/6,
21/8, 21/9 and CPC 2/2). See Figure 12-1.
[a] If the current drop is more than 0.2 volts in any wire, repair or replace the ground
circuit wires and connector. Refer to section 12.2.2.1.
[b] If the current drop is less than 0.2 volts in any wire, go to step 4.

12.2 SPN 168/FMI 1
4. Measure the current drop of the individual wires in the power circuit (MCM 21/11, 21/12,
21/14, 21/15 and CPC 2/1).See Figure 12-1
[a] If the current drop is more than 0.2 volts in any wire, repair or replace the power
circuit wires and connector. Refer to section 12.2.2.1.
[b] If the current drop is more than 0.2 volts in any wire, refer to section 12.2.2.1.

4. Check for codes

13 SPN 174 SUPPLY FUEL TEMPERATURE FAULT
Section Page
13.1 SPN 174/FMI 3 ......................................................................................... 13-3

13.2 SPN 174/FMI 4 ......................................................................................... 13-5
13.1 SPN 174/FMI 3
SPN 174/FMI 3 indicates an Supply Fuel Temperature Sensor (SFT Sensor) open circuit.

[a] If faults 174/3 and 110/3 are active at the same time, repair the open circuit between
pin 55 of the 120pin MCM Connector and pin 1 of the Engine Oil Temperature
(EOT) Sensor and the Supply Fuel Temperature (SFT) Sensor. Refer to section
13.1.2.1.
Check for an open circuit fault as follows:

1. Disconnect the Supply Fuel Temperature Sensor.
2. Measure the resistance across pins 1 and 2 of the SFT Sensor. See Figure 13-1.
Figure 13-1 Supply Fuel Temperature Sensor
[a] If the resistance is greater than 4k , replace SFT Sensor. Refer to section 13.1.2.1.
4. Measure the voltage between pins 1 and 2 of the SFT Sensor harness connector.

13.1 SPN 174/FMI 3

5. Measure the voltage between pin 2 of the SFT Sensor harness connector and ground.
[a] If the voltage is between 2.75 and 3.25 volts, repair the open circuit between
pin 1 of the SFT Sensor harness connector and pin 55 of the 120pin MCM
connector.See Figure 13-2. Refer to section 13.1.2.1.
[b] If the voltage is less than 2.75 volts, repair the open circuit between pin 2 of the SFT
Sensor harness connector and pin 77 of the 120pin MCM connector. See Figure
Figure 13-2 MCM 120pin Connector
6. Disconnect the 120pin MCM connector and measure the resistance between pins 1
and 2 of the SFT Sensor harness connector.
[a] If the resistance is less than 5 , repair the short between pins 55 and 77 of the
[b] If the resistance is greater than 5 , replace the sensor. Refer to section 13.1.2.1.

2. Turn ignition ON. Clear codes.

3. Start and run the engine for eight minutes. Stop engine.
[a] If no codes are logged, no further troubleshooting is required.
[b] If code 174/3 and any other codes are logged, review this section from the first step
to find the error. If not error is found, call the Detroit Diesel Customer Support
Center (3135925800).
[c] If code 174/3 is not logged but other codes are logged, troubleshoot the other codes.
13.2 SPN 174/FMI 4
SPN 174/FMI 4 indicates a SFT Sensor short to ground.
Perform the following steps to troubleshoot an SFT Sensor short-to-ground fault.

1. Disconnect the SFT Sensor.
2. Disconnect the 120-pin MCM connector.
3. Measure the resistance across pins 1 and 2 of the SFT Sensor connector.
[a] If resistance is less than 5 , repair short between wires 55 and 77 of the 120-pin
MCM connector. Refer to section 13.2.1.1.
[b] If resistance is greater than 5 , go to step 4.
4. Measure the resistance between pin 1 of the SFT Sensor harness connector and ground.
See Figure 13-3.
Figure 13-3 Supply Fuel Temperature Sensor
[a] If resistance is less than 5 , repair the short circuit between pin 1 of the SFT Sensor

13.2 SPN 174/FMI 4
[b] If resistance is greater than 5 , go to step 5.

5. Measure the resistance between pin 2 of the SFT Sensor harness connector and ground.
[a] If resistance is less than 5 , repair the short circuit between pin 2 of the SFT Sensor
[b] If resistance is greater than 5 , review steps 3 through 5. If the results are the same,

2. Turn ignition ON. Clear codes.
3. Start and run the engine for eight minutes. Stop engine.
[a] If no codes are logged, no further troubleshooting is required.
[b] If code 174/4 and any other codes are logged, review this section from the first step
to find the error. If not error is found, call the Detroit Diesel Customer Support
Center (3135925800).
[c] If code 174/4 is not logged but other codes are logged, troubleshoot the other codes.

14 SPN 175 ENGINE OIL TEMPERATURE OUTSIDE
NORMAL RANGE
Section Page
14.1 SPN 175/FMI 2 ......................................................................................... 14-3

14.2 SPN 175/FMI 3 ......................................................................................... 14-5
14.3 SPN 175/FMI 4 ......................................................................................... 14-7
14.1 SPN 175/FMI 2
This diagnosis is typically engine oil temperature out of range (drifted low/high).
NOTE:
When diagnosing rationality erratic data faults (FMI 2) always refer to SILs or SIBs or
any known issues first.
14.1.1 Rationality Check for Temperature Drift
Check for temperature drift as follows:

1. Check engine oil level. Add oil if needed and recheck for fault codes. If SPN 175/FMI 2
is still active, go to step 2.
2. Connect the diagnostic tool. Monitor the engine oil temperature and engine coolant
temperature.
3. With the engine running at idle and coolant temperature above 160, is the oil temperature
within X degrees of the coolant temperature?
[b] If no, disconnect the Engine Oil Pressure/Temp Sensor and the MCM connector.
Bridge pins 1 and 2 of the sensor harness. Measure the resistance at the MCM

14.1 SPN 175/FMI 2
between pins 55 and 108. If the resistance is greater than 3 , repair the harness. If
the resistance is less than 3 , replace the sensor. Refer to section 14.1.1.1.
Figure 14-1 Engine Oil Pressure/Temp Sensor Wiring
NOTE:
Steps 4 and 5 are for cold start applications only.
4. Using the diagnostic tool, monitor the engine oil temperature and the fuel consumed.
5. With the engine running at idle, when the fuel consumed is greater than 0.X gallons
is the oil temperature greater than 140?
[b] If no, disconnect the Engine Oil Pressure/Temp Sensor and the 120pin MCM
connector. Bridge pins 1 and 2 of the sensor harness. Measure the resistance at the
MCM between pins 55 and 108. If the resistance is greater than 3 , repair the
harness. If the resistance is less than 3 , replace the sensor. Refer to section 14.1.1.1.

4. Check for codes.


14.2 SPN 175/FMI 3
This diagnosis is typically engine oil temperature short to power.
14.2.1 Check for Short to Power
Check for a short to power as follows:

1. Check for multiple codes..
[a] If codes 100/3, 175/3 and 3480/3 are active at the same time, repair the open between
pin 82 of the 120pin MCM connector and associated sensors. Refer to section
14.2.1.1.
[b] If 100/3 and 175/3 are active, repair the open between pin 82 of the 120pin MCM
connector and pin 3 of the Engine Oil Temperature Sensor. Refer to section 14.2.1.1.
[c] If only fault 175/3 is active, go to step 2.
4. Measure the resistance between pins 1 and 2 of the Engine Oil Pressure/Temp Sensor.
[a] If the resistance is greater than 130k , replace the Engine Oil Pressure/Temp Sensor.
[b] If he resistance is less than 130k , go to step 5.
6. Measure the voltage between pins 2 of the Engine Oil Pressure/Temp Sensor harness
and ground.
[a] If the voltage is greater than 2.75 volts, go to step 7.

14.2 SPN 175/FMI 3
Figure 14-2 Engine Oil Pressure/Temp Sensor Wiring

9. Measure the resistance between pins 1 and 2 of the Engine Oil Pressure/Temp Sensor
harness connector.
[a] If the resistance is greater than 5, repapir the short to power on the circuit between
pin 108 of the 120pin MCM connector and pin 2 of the Engine Oil Pressure/Temp
Sensor harness connector. Refer to section 14.2.1.1.
[b] If he resistance is less than 5, repair the short between wires 105 and 108 of the

4. Check for codes.


14.3 SPN 175/FMI 4
This diagnosis is typically oil temperature sensor open short to ground.
14.3.1 Check for Short to Ground

3. Measure the resistance between pins 1 and 2 of the Engine Oil Pressure/Temp Sensor.
[a] If the resistance is greater than 5, repair the short to ground on the circuit between
pin 108 of the 120pin MCM connector and pin 2 of the Engine Oil Pressure/Temp
Sensor harness connector.Refer to section 14.3.1.1.
[b] If the resistance is less than 5, repair the short between pins 105 and 108 of 120pin
Figure 14-3 120pin MCM Connector

14.3 SPN 175/FMI 4

4. Check for codes.

15 SPN 411 EGR DIFFERENTIAL PRESSURE OR
DELTA P SENSOR CIRCUIT OUTSIDE OF NORMAL
OPERATING RANGE
Section Page
15.1 SPN 411/FMI 0 ......................................................................................... 15-3

15.2 SPN 411/FMI 1 ......................................................................................... 15-5
15.3 SPN 411/FMI 3 ......................................................................................... 15-6
15.4 SPN 411/FMI 4 ......................................................................................... 15-7
15.1 SPN 411/FMI 0
This diagnosis is typically EGR differential pressure failed high.
15.1.1 Check for Coolant Loss and Multiple Codes
Begin by checking for coolant loss as follows:

1. Inspect to see of the coolant level is low.
[a] If the coolant level is low, inspect the EGR cooler.
[b] If the coolant level is OK, go to step 2.
2. Check for multiple diagnostic trouble codes.
[a] If codes other than 411/0 are present, service them first.
[b] If only 411/0 is present, refer to section 15.1.2.
15.1.2 Check EGR Components
Check the EGR components as follows:

1. Connect DDDL for DDEC VI and monitor the coolant temperature, EGR Delta P, EGR
PW, EGR valve position and EGR temperature.
2. Start the engine and increase the RPM to 1200.
3. Activate EGR PW to 60%.
NOTE:
Do not exceed three minutes.
4. Is the EGR Delta P count greater than 170 and the EGR temperature greater than 90
above coolant temperature?
[a] If yes, repeat all the steps in section 15.1.1 and steps 1 through 4 in this section.
If the same results occur, contact the Detroit Diesel Customer Support Center
(3135925800).
5. Turn the engine OFF.
6. Inspect the EGR delivery pipes for damage and proper assembly.
[a] If damaged, repair as necessary. Refer to section 15.1.2.1.
[b] If OK, go to step 7.
7. Disconnect the EGR Delta P Sensor and inspect the EGR venturi tubes for blockage.
[a] If the tubes are blocked, clean them. Refer to section 15.1.2.1.
[b] If the tubes are not blocked, replace the EGR Delta P Sensor. Refer to section
15.1.2.1.

15.1 SPN 411/FMI 0

1. Turn the ignition OFF. Reconnect all connectors.
2. Turn the vehicle ignition ON, and clear codes.
4. Check for codes

15.2 SPN 411/FMI 1
This diagnosis is typically EGR differential pressure failed low.
15.2.1 Check for Multiple Codes

1. Connect DDDL for DDEC VI to check for codes.
2. Are codes other than 411/1 present?
[a] If codes other than 411/1 are present, service them first.
[b] If only 411/1 is present, refer to section 15.2.2.
15.2.2 Check EGR Components
Check the EGR components as follows:

1. Using DDDL for DDEC VI, monitor the coolant temperature, EGR Delta P, EGR PW,
EGR valve position and EGR temperature.
2. Idle the engine with the EGR PW less than 3% and the EGR position less than 5% (NO
EGR FLOW COMMANDED).
3. Is the EGR Delta P greater than 130 counts and the EGR temperature greater than 40
above the coolant temperature?
[a] If yes, replace the EGR valve. Refer to section 15.2.2.1.
4. Turn the engine OFF.
5. Disconnect the EGR Delta P Sensor and inspect the EGR tubes for blockage.
[a] If the tubes are blocked, clean them. Refer to section 15.2.2.1.
[b] If the tubes are not blocked, replace the EGR Delta P Sensor. Refer to section 15.2.2.1

4. Check for codes

15.3 SPN 411/FMI 3
15.3 SPN 411/FMI 3
This diagnosis is typically EGR Delta P Sensor short circuit.
15.3.1 Check for Short
Check the circuit for the EGR Delta P Sensor as follows:

1. Disconnect the EGR Delta P Sensor.
3. Measure the resistance across pins 1 and 3of the EGR Delta P Sensor. See Figure 15-1.
Figure 15-1 EGR Delta P Sensor
[a] If the resistance is greater than 5, repair the short to power on wire 109 of the
120pin MCM connector . Refer to section 15.3.1.1.
[b] If the resistance is less than 5, repair the short between pins 109 and 117 of the

4. Check for codes


15.4 SPN 411/FMI 4
This diagnosis is typically EGR Delta P Sensor open circuit.
15.4.1 Check for Open Circuit

1. Disconnect the EGR Delta P Sensor.
2. Measure the resistance across pins 1 and 3 of the EGR Delta P Sensor. See Figure 15-2.
Figure 15-2
[a] If the resistance is greater than 130 k, replace the EGR Delta P Sensor.
[b] If the resistance is less than 130 k, go to step 3.
3. Measure the resistance between pins 1 and 2 of the EGR Delta P Sensor.
[a] If the resistance is greater than 130 k, replace the EGR Delta P Sensor.
[b] If the resistance is less than 130 k,, go to step 4.
5. Measure the voltage between pins 1 and 3 of the EGR Delta P Sensor harness connector.

15.4 SPN 411/FMI 4

6. Measure the voltage between pin 1 of the EGR Delta P Sensor harness connector and
ground.
of the EGR Delta P Sensor harness connector and pin 109 of the 120pin MCM
connector. Refer to section 15.4.1.1.
[b] If the voltage is less than 4.5 volts, repair the open circuit between pin 1 of the EGR
Delta P Sensor harness connector and pin 117 of the 120pin MCM connector.
9. Measure the resistance between pins 1 and 3 of the EGR Delta P Sensor harness connector.
[a] If the resistance is less than 5 , repair the short in wires between pins 1 and 3 of
the EGR Delta P Sensor harness connector and pins 117 and 109 of the 120pin
10. Measure the resistance across pins 2 and 3 of the EGR Delta P Sensor harness connector.
[a] If the resistance is less than 5 , repair the short in wires between pins 109 and 103
of the 120pin MCM connector. Refer to section 15.3.1.1
11. Measure the resistance between pin 1of the EGR Delta P Sensor harness connector and
ground.
[a] If the resistance is less than 5 , repair the short circuit between pin 117 of the
120pin MCM connector and ground. Refer to section 15.3.1.1.
12. Measure the resistance between pin 3 of the EGR Delta P Sensor harness connector and
ground..
[a] If the resistance is less than 5 , repair the short between pin 109 of the 120pin
MCM connector and ground. Refer to section 15.4.1.1.
[b] If the resistance is greater than 5 , repair the open circuit between pin 3 of the
EGR Delta P Sensor harness connector and pin 109 of the 120pin MCM connector.


4. Check for codes

15.4 SPN 411/FMI 4

16 SPN 558 - IDLE VALIDATION SWITCH
Section Page
16.1 SPN 558/FMI 1 ......................................................................................... 16-3

16.2 SPN 558/FMI 3 ......................................................................................... 16-3
16.3 SPN 558/FMI 4 ......................................................................................... 16-5
16.1 SPN 558/FMI 1
This fault is a typically incorrect wiring of the Idle Validation Switch (IVS).
16.1.1 Idle Validation Switch Wiring Check
Check Idle Validation Switch (IVS) wiring as follows:

1. Connect the diagnostic tool
3. Monitor IVS #1 and IVS #2 with the throttle pedal in the idle position.
4. If IVS #1 reads OFF and IVS #2 reads ON, verify the proper wire pin outs.
IVS #1 should be routed from Idle Validation Switch pin 5 to pin 6 of the CPC #1
connector.
IVS #2 should be routed from Validation Switch pin 6 to pin 3 of the CPC #1 connector.
5. If wiring checks OK, contact the Detroit Diesel Customer Support Center (3135925800).
16.2 SPN 558/FMI 3
This diagnostic condition is typically an open circuit.
Check for open as follows:

1. Disconnect the Idle Validation Switch.
3. Measure the voltage between the Idle Validation Switch pins 4 and 6.
4. Measure the voltage between the Idle Validation Switch pin 4 and ground.
[b] If the voltage is less than 11.5 volts, repair the open wire between pin 6 of the CPC
#1 connector and pin 4 of the Idle Validation Switch. Refer to section 16.2.1.1.
6. Measure the resistance between pin 2 of the CPC #2 connector and pin 6 of the Idle
Validation Switch.
[a] If the resistance is greater than 5, repair the open the wire between pin 2 of the CPC
#2 connector and pin 6 of the Idle Validation Switch. Refer to section 16.2.1.1.
[b] If the resistance is less than 5, replace the Idle Validation Switch. Refer to section
16.2.1.1.

16.2 SPN 558/FMI 3
7. Measure the voltage between the Idle Validation Switch pins 5 and 6.
[a] If the voltage is greater than 11.5 volts, replace the Idle Validation Switch.
[b] If the voltage is less than 11.5 volts, repair the open the wire between pin 3 of the
CPC #1 connector and pin 5 of the Idle Validation Switch. Refer to section 16.2.1.1.

4. Check for codes

16.3 SPN 558/FMI 4
Check for short to ground as follows:

1. Disconnect the Idle Validation Switch. See Figure 16-1.
Figure 16-1 Idle Validation Switch, Part of the Accelerator Pedal Assembly

3. Measure the resistance between pin 4 of the Idle Validation Switch connector and ground.
[a] If the resistance is less than 5 , repair the short to ground between pin 6 of the CPC
#1 connector and pin 4 of the Idle Validation Switch connector. Refer to section
16.3.1.1.
4. Measure the resistance between pin 5 of the Idle Validation Switch connector and ground.
[a] If the resistance is less than 5 , repair the short to ground between pin 3 of the CPC
#1 connector and pin 5 of the Idle Validation Switch connector. Refer to section
16.3.1.1.
[b] If the resistance is greater than 5 , replace the Idle Validation Switch.

16.3 SPN 558/FMI 4

4. Check for codes

17 SPN 599 - CRUISE CONTROL SWITCHES NOT
FUNCTIONING PROPERLY
Section Page
17.1 SPN 599/FMI 12 ....................................................................................... 17-3

17.1 SPN 599/FMI 12
This diagnosis is typically both Cruise Control switches, SET and RES, are shorted to ground.

1. Turn the ignition ON and place the Cruise Control Switch in the OFF position. DO NOT
start the engine.
2. Check the driver console display.
[a] If Cruise Control switch status RES is displayed, go to step 3.
[b] If Cruise Control switch status SET is displayed, go to step 4.
3. Unplug the RES Cruise Control Switch.
[a] If RES status is no longer displayed, replace the Cruise Control RES Switch.
[b] If RES status is still displayed, repair the short to ground in the wire from the RES
switch to pin 16 of the CPC #1 connector. Refer to section 17.1.1.1.
4. Unplug the SET Cruise Control Switch.
[a] If SET status is no longer displayed, replace the Cruise Control SET Switch.
[b] If SET status is still displayed, repair the short to ground in the wire from the SET

4. Check for codes.

17.1 SPN 599/FMI 12

18 SPN 601 - CRUISE CONTROL SWITCHES NOT
FUNCTIONING PROPERLY
Section Page
18.1 SPN 601/FMI 12 ....................................................................................... 18-3

18.1 SPN 601/FMI 12
This diagnosis is typically both Cruise Control switches, SET and RES, are shorted to ground.
18.1.1 Short to Ground

1. Turn the ignition ON and place the Cruise Control Switch in the OFF position. DO NOT
start the engine.
2. Check the driver console display.
[a] If Cruise Control switch status RES is displayed, go to step 3.
[b] If Cruise Control switch status SET is displayed, go to step 4.
3. Unplug the RES Cruise Control Switch.
[a] If RES status is no longer displayed, replace the Cruise Control RES Switch.
[b] If RES status is still displayed, repair the short to ground in the wire from the RES
4. Unplug the SET Cruise Control Switch.
[a] If SET status is no longer displayed, replace the Cruise Control SET Switch.
[b] If SET status is still displayed, repair the short to ground in the wire from the SET

4. Check for codes.

18.1 SPN 601/FMI 12

19 SPN 609 - MCM FAULT (ERRONEOUS DATA)
Section Page
19.1 SPN 609/FMI 12 ....................................................................................... 19-3

19.2 SPN 609/FMI 14 ....................................................................................... 19-4
19.1 SPN 609/FMI 12
This diagnostic condition is typically MCM failed or programmed incorrectly.
19.1.1 MCM Parameter Check
Check the parameters as follows:

1. Using your diagnostic tool, reset the parameters on the MCM.
[a] If fault code 233/12 is not active after resetting parameters, troubleshooting is
finished.
[b] If fault code 233/12 is still active after resetting parameters, go to step 2.
2. Check the MCM parameters to ensure they are correct for the vehicle configuration.
[a] If parameters are not correct, reset parameters on the MCM.
[b] If parameters are correct, contact Detroit Diesel Customer Support Center
MCM.

19.2 SPN 609/FMI 14
19.2 SPN 609/FMI 14
This diagnostic condition is typically MCM incorrectly programmed.
19.2.1 MCM Check
Check the MCM as follows:

1. Check to ensure the MCM is correct for the engine.
[a] If MCM is correct for the engine, go to step 2.
[b] If MCM is not correct for the engine, contact Detroit Diesel Customer Support
Center (3135925800) for authorization to replace the MCM. Set parameters on
the new MCM.
2. Reset the MCM parameters.
[a] If fault code 233/14 is not active after the MCM parameters are reset, troubleshooting
is complete.
[b] If fault code 233/14 is still active after the MCM parameters are reset, go to step 3.
3. Check the MCM parameters to ensure they are correct for the vehicle configuration.
[a] If the MCM parameters are not correct, reset the parameters.
[b] If the MCM parameters are correct, contact Detroit Diesel Customer Support Center
(3135925800) for authorization to replace the MCM. Set the parameters on the
new MCM.

20 SPN 615 - ELECTROSTATIC OIL SEPARATOR
OUTSIDE OF NORMAL OPERATING RANGE
Section Page
20.1 SPN 615/FMI 3 ......................................................................................... 20-3

20.2 SPN 615/FMI 4 ......................................................................................... 20-4
20.1 SPN 615/FMI 3
This is typically a short to power.
Check as follows:
1. Plug in diagnostic tool.
[a] If 615/3 and 2791/3 are present, repair the open between pin 67 of the 120pin MCM
connector and pin 1 of the Electrostatic Oil Separator connector and pin 3 of the EGR
valve connector. Refer to section 20.1.2.1.
[b] If only 615/3 is present, turn the ignition OFF and refer to section 20.1.2.
4. Turn ignition OFF.
Check as follows:
1. Disconnect the Electrostatic Oil Separator connector.
3. Measure the voltage between pins 1 and 2 of the Electrostatic Oil Separator connector.
[b] If the voltage is less than 11.5 volts, repair the open between pin 1 of the Electrostatic
Oil Separator connector and pin 67 of the 120pin MCM connector. See Figure
Figure 20-1 Electrostatic Oil Separator Wiring

20.2 SPN 615/FMI 4

6. Measure the resistance between pins 2 and 3 of the Electrostatic Oil Separator connector.
[a] If the resistance is greater than 5 , repair the open between pin 2 of the Electrostatic
Oil Separator connector and pin 39 of the 120pin MCM connector. Refer to section
20.1.2.1.
[b] If the resistance is less than 5 , repair the short between pin 2 and 3 of the
Electrostatic Oil Separator connector and pins 39 and 107 of the 120pin MCM

4. Check for codes.
20.2 SPN 615/FMI 4
This is typically an open/short to ground.
20.2.1 Open/Short to Ground Check
Check as follows:
1. Disconnect the Electrostatic Oil Separator connector.
2. Measure the resistance between pins 1 and 2 of the Electrostatic Oil Separator.

[a] If the resistance is greater than 150 , replace the Electrostatic Oil Separator.
Figure 20-2 Electrostatic Oil Separator Wiring
[b] If the resistance is less than 150 , go to step 3.

3. Measure the resistance between pins 1 and 3 of the Electrostatic Oil Separator.
[a] If the resistance is greater than 150 , replace the Electrostatic Oil Separator.
6. Measure the resistance between pin 3 of the Electrostatic Oil Separator connector and
ground.
[a] If the resistance is greater than 5 , repair the open between pin 3 of the Electrostatic
Oil Separator connector and pin 107 of the 120pin MCM connector. Refer to section
20.2.1.1.
[b] If the resistance is less than 5 , repair the short to ground between pin 3 of the
Electrostatic Oil Separator connector and pin 107 of the 120pin MCM connector.


20.2 SPN 615/FMI 4
4. Check for codes.


21 SPN 615 - INTAKE AIR DELTA PRESSURE OUTSIDE
OF NORMAL OPERATING RANGE
Section Page
21.1 SPN 615/FMI 3 ......................................................................................... 21-3

21.2 SPN 615/FMI 4 ......................................................................................... 21-5
21.1 SPN 615/FMI 3
This diagnosis is typically an open circuit.
Check as follows:
[a] If 51/3 and 615/3 are present, repair the open between pin 103 of the 120pin MCM
connector and pin 2 of the Intake Air Delta P Sensor and the Intake Throttle Valve.
Figure 21-1 Intake Air Delta P Sensor
[b] If only 615/3 is present, go to step 2.

2. Disconnect the Intake Air Delta P Sensor.
3. Measure the resistance across pins 1 and 2 of the Intake Air Delta P Sensor.
[a] If the resistance is greater than 200k , replace the Intake Air Delta P Sensor.
4. Measure the resistance across pins 1 and 3 of the Intake Air Delta P Sensor.
[a] If the resistance is greater than 50k , replace the Intake Air Delta P Sensor.
6. Measure the voltage between pins 1 and 2 of the Intake Air Delta P Sensor harness
connector.

21.1 SPN 615/FMI 3
7. Measure the voltage between pin 1 of the Intake Air Delta P Sensor harness connector
and ground.
[a] If the voltage is between 4.5 and 5.5 volts, repair the open circuit between pin 2 of
the Intake Air Delta P Sensor harness connector and pin 103 of the 120pin MCM
connector. See Figure 21-2. Refer to section 21.1.1.1.
[b] If the voltage is less than 4.5 volts, repair the open circuit between pin 1 of the Intake
Air Delta P Sensor harness connector and pin 117 of the 120pin MCM connector.
10. Measure the resistance between pins 1 and 3 of the Intake Air Delta P Sensor harness
connector.
[b] If the resistance is less than 5 , repair the short in wires between pins 1 and 3 of
the Intake Air Delta P Sensor harness connector and pin 109 of the 120pin MCM
11. Measure the resistance between pin 3 of the Intake Air Delta P Sensor harness connector
and pin 109 of the 120pin MCM connector.
[a] If the resistance is greater than 3 , repair the open between pin 3 of the Intake
Air Delta P Sensor harness connector and pin 109 of the 120pin MCM connector.

[b] If the resistance is less than 3 , repeat steps 2 through 11. If the results are the same,
contact the Detroit Diesel Customer Support Center (3135925800).

4. Check for codes
21.2 SPN 615/FMI 4
This diagnosis is typically a short to ground.
Check as follows:
1. Disconnect the Intake Air Delta P Sensor.
3. Measure the resistance between pins 1 and 2 of the Intake Air Delta P Sensor. See Figure
21-3.
Figure 21-3 Intake Air Delta P Sensor

21.2 SPN 615/FMI 4
[a] If the resistance is less than 5, repair the short between pins 117 and 103 of the
120pin MCM connector. See Figure 21-4. Refer to section 21.2.1.1.
[b] If the resistance is greater than 5, go to step 4.

4. Measure the resistance between pins 2 and 3 of the Intake Air Delta P Sensor.
[a] If the resistance is less than 5, repair the short between pins 109 and 103 of the
and ground.
[a] If the resistance is less than 3, repair the short circuit between pin 1 of the Intake
Air Delta P Sensor harness connector and ground. Refer to section 21.2.1.1.
and ground.
[a] If the resistance is less than 3, repair the short circuit between pin 3 of the Intake
Air Delta P Sensor harness connector and ground. Refer to section 21.2.1.1.
[b] If the resistance is greater than 3, repeat steps 3 through 6. If the results are the
same, contact the Detroit Diesel Customer Support Center (3135925800).


4. Check for codes

21.2 SPN 615/FMI 4

22 SPN 625 - CAN FAULT
Section Page
22.1 SPN 625/FMI 2, 9, 10, 13, 14 ................................................................... 22-3

22.2 SPN 625/FMI 4 ......................................................................................... 22-5
22.1 SPN 625/FMI 2, 9, 10, 13, 14
This fault is typically erratic data or the CAN propriety data link has failed due to no
communication between the MCM and the CPC.
NOTE:
The following diagnostics pertain to faults received from the MCM and /or the CPC.
22.1.1 Data Link Check
Check as follows:
1. Have the MCM and/or the CPC been recently changed or reprogrammed?
[a] If yes, verify the that the correct MCM calibration and/or the correct CPC parameter
list has been installed. If the correct calibration and correct parameter list have been
installed, go to step 2.
4. Measure the battery voltage at pin 7 on the MCM 21pin connector.
[a] If the battery voltage is less than 10.5 volts, restore the battery voltage at pin 7 on the
MCM 21pin connector.
NOTE:
Poor battery grounds can be a possible cause of low battery voltage.
[b] If the battery voltage is greater than 10.5 volts, go to step 5.

5. Turn ignition OFF, leave the 21pin MCM connector disconnected.
7. Measure the resistance between pins 1 and 3 of the CPC #4 connector.
[b] If the resistance is less than 5 , repair the short in the wires between pins 1 and
3 of the CPC #4 connector and pins 13 and 19 of the 21pin MCM connector.
8. Measure the resistance between pin 1 of the CPC #4 connector and ground.
[b] If the resistance is less than 5 , repair the short to ground between pin 1 of the CPC
#4 connector and ground. Refer to section 22.1.1.1.

22.1 SPN 625/FMI 2, 9, 10, 13, 14
10. Measure the resistance between pin 1 of the CPC #4 connector and pin 19 of the 21pin
MCM connector.
[a] If the resistance is greater than 5 , repair the open between pin 1 of the CPC #4
connector and pin 19 of the 21pin MCM connector. Refer to section 22.1.1.1.
MCM connector.
[b] If the resistance is less than 5 , call the DDC Customer Support Center
(3135925800).

4. Check for codes
[b] If code 625/2,9,10,13,14 is not logged but other codes are logged, troubleshoot the
other codes.
[c] If code 625/2,9,10,13,14 and other codes are logged repeat troubleshooting
procedure. If no error is found, contact the Detroit Diesel Customer Support Center
(3135925800).

22.2 SPN 625/FMI 4
This fault indicates that the CAN propriety data link to the CPC has shorted.
NOTE:
The following diagnostic pertains to a fault reported from the CPC.
22.2.1 Check for Short Circuit
Check as follows:
1. Turn ignition OFF, disconnect the 21pin MCM connector.
3. Measure the resistance between pins 1 and 3 of the CPC #4 connector.
[b] If the resistance is less than 5 , repair the short in the wires between pins 1 and
3 of the CPC #4 connector and pins 13 and 19 of the 21pin MCM connector.
MCM connector.
MCM connector.
[b] If the resistance is less than 5 , call the DDC Customer Support Center
(3135925800).

22.2 SPN 625/FMI 4

4. Check for codes

23 SPN 636 CRANKSHAFT POSITION SENSOR
OUTSIDE OF NORMAL OPERATING CONDITIONS
Section Page
23.1 SPN 636/FMI 1 ......................................................................................... 23-3

23.2 SPN 636/FMI 3 ......................................................................................... 23-5
23.3 SPN 636/FMI 4 ......................................................................................... 23-7
23.4 SPN 636/FMI 7 ......................................................................................... 23-9
23.5 SPN 636/FMI 8 ......................................................................................... 23-10
23.1 SPN 636/FMI 1
The diagnostic condition is typically CKP Sensor Signal Voltage Too Low.
23.1.1 Low Signal Voltage Check
Check low signal voltage as follows:

1. If fault occurs only when cranking the engine (and engine will not start), check that the
CKP and Camshaft Position (CMP) sensors are correctly wired to the MCM. See Figure
23-1.
Figure 23-1 Crankshaft Position Sensor Wiring
[a] If wires are not correctly wired, repair or replace wires as required. Refer to section
23.1.1.1.
[b] If wires are correctly wired, go to step 2.
2. If fault occurs at other times then when cranking the engine, check that the CKP Sensor
position is correct (the sensor is seated in all the way).
[a] If fault is not active after checking CKP Sensor position, repair the CKP Sensor
clamping sleeve. Refer to section 23.1.1.1.
[b] If fault is still active after checking the CKP Sensor position, go to step 3.
3. Check the flywheel position through the inspection window of the timing case using
turning tool. Look for timing marks and damage.
[a] If the flywheel is out of position, repair or replace, as required. Refer to section
23.1.1.1.
[b] If sthe flywheel is not out of position, go to step 4.
4. Check crankshaft axial play.

23.1 SPN 636/FMI 1
[a] If axial play is not within specifications, repair or replace crankshaft thrust bearings,
as required. Refer to section 23.1.1.1.
[b] If axial play is within specifications, replace the MCM. Refer to section 23.1.1.1.


23.2 SPN 636/FMI 3
The diagnostic condition is typically CKP Sensor has an open circuit.
Check for a CKP Sensor open circuit as follows:

1. Disconnect the CKP Sensor.
2. Measure the resistance across pins 1 and 2 of the CKP Sensor. See Figure 23-2.
[a] If the resistance is greater than 140 , replace CKP Sensor. Refer to section 23.2.2.1.
4. Measure the resistance across pins 1 and 2 of the CKP Sensor harness connector.
[b] If the resistance is less than 5 , repair the short between pins 1 and 2 of the CKP
Sensor harness connector and pins 42 and 43 of the 120pin MCM connector.
5. Measure the resistance between pin 1 of the CKP Sensor harness connector and pin 42
of the 120pin MCM connector.
[a] If the resistance is greater than 5 , repair the open between pin 1 of the CKP Sensor
harness connector and pin 42 of the 120pin MCM connector. Refer to section
23.2.2.1.

23.2 SPN 636/FMI 3
[a] If the resistance is greater than 5 , repair the open between pin 2 of the CKP Sensor
23.2.2.1.
[b] If the resistance is less than 5 , refer to section 23.2.2.
23.2.2 Crankshaft Position Sensor Gap Check
Check the crankshaft position sensor gap as follows:

1. Bar the engine until the CKP Sensor is over a CKP tooth of the pulse wheel.
2. Check the gap between the CKP Sensor and the tooth of the pulse wheel (0.020 to 0.040
in.). A depth micrometer can be used.
[a] If the gap setting is correct, repeat steps 1 and 2. If the results are the same, call the
Detroit Diesel Customer Support Center (3135925800).
[b] If the gap setting is not correct, adjust the CKP Sensor until the gap setting is correct
and refer to section 23.2.2.1. If the problem returns, the pulse wheel may be loose or
bad or damaged.


23.3 SPN 636/FMI 4
This diagnostic condition is typically the CKP Sensor shorted to ground.
Troubleshoot a CKP Sensor short to ground fault as follows:

1. Disconnect the CKP Sensor.
2. Measure the resistance between pin 1 of the CKP Sensor and ground.
[b] If the resistance is less than 5 , replace the sensor. Refer to section 23.3.1.1.
3. Measure the resistance between pin 2 of the CKP Sensor and ground.
5. Measure the resistance across pins 1 and 2 of the CKP Sensor harness connector.
See Figure 23-3.

[b] If the resistance is less than 5 , repair the short between the CKP Sensor harness
connector pins 1 and 2 and pins 42 and 43 of the 120pin MCM connector.
6. Measure the resistance between pin 1 of the CKP Sensor harness connector and ground.

23.3 SPN 636/FMI 4
[b] If the resistance is less than 5 , repair the short to ground between pin 1 of the CKP
Sensor harness connector and pin 42 of the 120pin MCM connector. Refer to section
23.3.1.1.
[a] If the resistance is greater than 5 , reconnect the 120pin MCM connector and
review steps 2 through 7. If the results are the same, call the Detroit Diesel Customer
[b] If the resistance is less than 5 , repair the short to ground between pin 2 of the CKP
Sensor harness connector and pin 43 of the 120pin MCM connector. Refer to section
23.3.1.1.


23.4 SPN 636/FMI 7
This diagnostic condition is typically camshaft and crankshaft signals not matching.
23.4.1 Camshaft and Crankshaft Signals Not Matching Check
Troubleshoot a no match of camshaft and crankshaft signals fault as follows:

1. Remove CKP and CMP sensors.
2. Reseat the CKP Sensor until it touches the flywheel and reseat the CMP Sensor until it
touches the cam gear. Check codes.
[a] If 636/7 is not active, refer to section 23.4.1.1.
[b] If 636/7 is active, go to step 3.
3. Remove CKP and CMP sensors.
4. Remove O-ring in CMP Sensor opening.
5. Reseat CKP Sensor until it touches the flywheel and reseat the CMP Sensor without the
O-ring until the sensor touches the cam gear.
[a] If 636/7 is not active, replace the O-ring with a smaller O-ring. Refer to section
23.4.1.1.
[b] If 636/7 is active, go to step 6.
6. Disconnect the CKP Sensor connector and measure the sensor reisitance.
[a] If the sensor resistance is not between 1000 and 1385 , replace the sensor.
refer to section 23.4.1.1.
[b] If the sensor resistance is between 1000 and 1385 , go to step 7.

23.5 SPN 636/FMI 8
7. Verify that all flywheel holes or slots are present by viewing through the access hole
on the flywheel housing.
[a] If the flywheel holes or slots are missing or damaged, replace the flywheel as needed.
refer to section 23.4.1.1.
[b] If the flywheel holes or slots are all present, go to step 8.
8. Replace the MCM. Refer to section 23.4.1.1.

23.5 SPN 636/FMI 8
The diagnostic condition is typically CKP Sensor Time Out.

1. Turn ON ignition and engine.
2. Plug in your diagnostic tool.
3. Read active codes.
[a] If fault 636/3 is active in addition to fault 636/8 with the engine running,
refer to section 23.2.1.
[b] If fault 636/4 is active in addition to fault s 636/8 with the engine running,
refer to section 23.3.1.
[c] If only fault s 636/8 is active with the engine running, refer to section 23.5.2.

23.5.2 Sensor Time Out Check
Check for a sensor time out as follows:

1. Check the CKP Sensor position.
[a] If fault 636/8 is not active after checking position, replace CKP Sensor clamping
sleeve. Refer to section 23.5.2.1.
[b] If fault 636/8 is active after checking position, go to step 2.
2. Replace the Vehicle Speed Sensor.
[a] If fault s 636/8 is not active, refer to section 23.5.2.1.
[b] If fault s 636/8 is still active, go to step 3.
3. Check the flywheel position in the timing case through the inspection window using
the turning tool.
[a] If sensors are out of position, repair or replace the spring bushing, as required. Erase
fault code memory. See Figure 23-4.
Figure 23-4 Crankshaft Position Sensor
[b] If sensors are not out of position, go to step 4.

4. Check crankshaft axial play.
[a] If axial play is not within specifications, repair or replace crankshaft thrust bearings,
as required. Refer to section 23.5.2.1.
[b] If axial play is within specifications, contact the Detroit Diesel Customer Support
Center (313-592-5800).

23.5 SPN 636/FMI 8


24 SPN 651 INJECTOR #1 NOT OPERATING
NORMALLY
Section Page
24.1 SPN 651/FMI 5 ......................................................................................... 24-3

24.2 SPN 651/FMI 10 ....................................................................................... 24-5
24.1 SPN 651/FMI 5
This diagnosis is typically the injector current is below normal or an open circuit fault.

[a] If fault code 168/0 is active in addition to 651/5, service 168/0 first. Refer to section
12.1.
[b] If fault 652/5 and 653/5 are active in addition to 651/5, call the Detroit Diesel
Customer Support Center (3135925800) for MCM replacement.
[c] If only fault code 651/5 is active, refer to section 24.1.2.
Check as follows:
2. Remove valve cover.
3. Turn the ignition ON
4. Measure the voltage between pins 1and 2 of injector #1. See Figure 24-1.
Figure 24-1 Injector #1
[a] If the voltage is less than 11.5 volts, go to step 5.

24.1 SPN 651/FMI 5
[b] If the voltage is greater than 11.5 volts, replace injector #1. After the replacing the
injector,refer to section 24.1.2.1.
5. Measure the voltage between pin 1 of injector #1 and ground.
[a] If the voltage is less than 11.5 volts, repair the open between pin 27 of the 120pin
MCM connector and pin 1 of injector #1. Refer to section 24.1.2.1.
[b] If the voltage is greater than 11.5 volts, repair the open between pin 26 of the 120pin

4. Check for codes

24.2 SPN 651/FMI 10
Check as follows:
3. Remove the valve cover.
4. Disconnect pins 1 and 2 of injector #1.
5. Measure the resistance between pin 1 of injector #1 and ground. See Figure 24-2.
[a] If the resistance is less than 5 , replace injector #1. After the replacing the
6. Measure the resistance between pins 1 and 2 of the injector #1 harness.
[a] If the resistance is less than 5 , repair the short between pin 1 and pin 2 of injector
#1 and pins 27 and 26 of the 120pin MCM connector. Refer to section 24.2.1.1.
7. Measure the resistance between pin 1 of the injector #1 harness and ground.
[a] If the resistance is less than 5 , repair the short to ground between pin 1 of the
injector #1 harness and pin 27 of the MCM 120pin connector. Refer to section
24.2.1.1.

24.2 SPN 651/FMI 10
[b] If the resistance is greater than 5 , repair the short to ground between pin 2 of the
24.2.1.1.

4. Check for codes

NORMALLY
Section Page
25.1 SPN 652/FMI 5 ......................................................................................... 25-3

25.2 SPN 652/FMI 10 ....................................................................................... 25-5
25.1 SPN 652/FMI 5
Check as follows:
12.1.
Check as follows:

25.1 SPN 652/FMI 5

4. Check for codes

25.2 SPN 652/FMI 10
Check as follows:
25.2.1.1.

25.2 SPN 652/FMI 10
25.2.1.1.

4. Check for codes

NORMALLY
Section Page

26.1 TROUBLESHOOTING SPN 653/FMI 5

12.1.
Check as follows:


4. Check for codes

Check as follows:
26.2.1.1.

26.2.1.1.

4. Check for codes

NORMALLY
Section Page


12.1.
Check as follows:

injector, refer to section 27.1.2.1.

1. Turn the vehicle ignition OFF and reconnect all connectors.
4. Check for codes

Check as follows:
27.2.1.1.

27.2.1.1.

4. Check for codes

NORMALLY
Section Page
28.1 SPN 655/FMI 5 ......................................................................................... 28-3

28.2 SPN 655/FMI 10 ....................................................................................... 28-5
28.1 SPN 655/FMI 5
Check as follows:
12.1.
Check as follows:

28.1 SPN 655/FMI 5

4. Check for codes

28.2 SPN 655/FMI 10
Check as follows:
28.2.1.1.

28.2 SPN 655/FMI 10
28.2.1.1.

4. Check for codes

NORMALLY
Section Page
29.1 SPN 656/FMI 5 ......................................................................................... 29-3

29.2 SPN 656/FMI 10 ....................................................................................... 29-5
29.1 SPN 656/FMI 5

12.1.
Check as follows:

29.1 SPN 656/FMI 5

4. Check for codes

29.2 SPN 656/FMI 10
Check as follows:
29.2.1.1.

29.2 SPN 656/FMI 10
29.2.1.1.

4. Check for codes

30 SPN 701 - CONSTANT THROTTLE VALVE (AUX
PWM #7) NOT OPERATING NORMALLY
Section Page
30.1 SPN 701/FMI 3 ......................................................................................... 30-3

30.2 SPN 701/FMI 4 ......................................................................................... 30-4
30.3 SPN 701/FMI 5 ......................................................................................... 30-6
30.1 SPN 701/FMI 3
This diagnosis is typically a short to power.
Check as follows:
1. Disconnect the Constant Throttle Valve connector.
3. Measure the voltage between pin 1 of the Constant Throttle Valve connector and ground.
[a] If the voltage is greater than 11.5 volts, repair the short to power between pin 1 of
the Constant Throttle Valve connector and pin 32 of the 120pin MCM connector.
Figure 30-1 Constant Throttle Valve

6. Measure the resistance between pins 1 and 2 of the Constant Throttle Valve connector.
[a] If the resistance is greater than 5, repeat steps 2 through 6. If the results are the
[b] If the resistance is less than 5, repair the short between pins 1 and 2 of the Constant
Throttle Valve and pins 32 and 64 of the 120pin MCM connector. Refer to section
30.1.1.1.

30.2 SPN 701/FMI 4

[b] If code 701/3 is not logged and other codes are logged, troubleshoot the logged codes.
30.2 SPN 701/FMI 4
Check as follows:
[a] If 3471/4 and 3482/4 are active with 701/4, repair the short to ground on pin 64 of the
120pin MCM connector and pin 2 of the Constant Throttle Valve and pin 2 of the
Electronic Dosing Valve connector and pin 2 of the Fuel Shutoff Valve. See Figure
[b] If only 701/4 is active, go to step 2.
4. Measure the resistance between pins 1 and 2 of the Constant Throttle Valve connector.
[a] If the resistance is greater than 5, go to step 5.

[b] If the resistance is less than 5, repair the short between wires 32 and 64 of the
5. Measure the resistance between pin 1 of the Constant Throttle Valve connector and ground.
[a] If the resistance is greater than 5, repeat steps 4 and 5. If the results are the same,
[b] If the resistance is less than 5, repair the short between pin 1 of the Constant
Throttle Valve connector and ground. Refer to section 30.2.1.1.


30.3 SPN 701/FMI 5
30.3 SPN 701/FMI 5
This diagnosis is typically an open circuit
Check as follows:
[a] If 3471/5 and 3482/5 are active with 701/5, repair the open between pin 64 of the
120pin MCM connector and pin 2 of the Constant Throttle Valve and pin 2 of the
Electronic Dosing Valve connector and pin 2 of the Fuel Shutoff Valve. See Figure

4. Measure the voltage between pins 1 and 2 of the Constant Throttle Valve connector.
[a] If the voltage is between 11 and 13 volts, replace the Constant Throttle Valve.
[b] If the voltage is less than 11 volts, go to step 5.
5. Measure the voltage between pin 2 of the Constant Throttle Valve connector and ground.
[a] If the voltage is between 11 and 13 volts, repair the open in the wire between pin 32
of the 120pin MCM connector and pin 1 of the Constant Throttle Valve connector.
[b] If the voltage is less than 11 volts, repair the open in the wire between pin 64 of
the 120pin MCM connector and pin 2 of the Constant Throttle Valve connector.



30.3 SPN 701/FMI 5

31 SPN 704 - WASTEGATE VALVE CONTROL (AUX
PWM #10)
Section Page
31.1 SPN 704/FMI 3 ......................................................................................... 31-3

31.2 SPN 704/FMI 4 ......................................................................................... 31-4
31.3 SPN 704/FMI 5 ......................................................................................... 31-6
31.1 SPN 704/FMI 3
Check for short to power as follows:

1. Disconnect the wastegate valve connector.
3. Measure the voltage between pin 3 of the wastegate valve connector and ground.
[a] If the voltage is greater than 11.5 volts, repair the short to power between pin 3 of the
wastegate valve connector and pin 35 of the 120pin MCM connector.
[b] If the voltage is less than 11.5 volts, go to step 4. See Figure 31-1.
Figure 31-1 Wastegate

6. Measure the resistance between pins 3 and 4 of the wastegate valve connector.
wastegate valve connector and pins 35 and 93 of the 120pin MCM connector.
[b] If the resistance is greater than 5 , review steps 1 through 6. If the results are the


31.2 SPN 704/FMI 4

[b] If code SPN 704/3 is not logged and other codes are logged, troubleshoot the logged
codes.
31.2 SPN 704/FMI 4

[a] If 706/4 is active with 704/4, repair the short to ground on pin 93 of the MCM
120pin connector and pin 4 of the wastegate valve and pin 2 of the EPV2 solenoid.

4. Measure the resistance between pins 1 and 3 of the wastegate valve connector. See Figure
31-2.
5. Measure the resistance between pin 3 of the wastegate valve connector and ground.
[a] If the resistance is less than 5 , repair the short between pin 3 of the wastegate valve
[b] If the resistance is greater than 5 , repeat steps 4 and 5. If the results are the same,

codes.

31.3 SPN 704/FMI 5
31.3 SPN 704/FMI 5
Check for an open circuit as follows:

[a] If 706/5 is active with 704/5, repair the open circuit between pin 93 of the MCM
120pin connector and pin 4 of the wastegate valve and pin 2 of the EPV2 solenoid.

4. Measure the voltage between pins 1 and 4 of the wastegate valve connector.
[a] If the voltage is between 11 and 13 volts, go to step 6.
5. Measure the voltage between pin 4 of the wastegate valve connector and ground.
[a] If the voltage is between 11 and 13 volts, then repair the open in the wire between
pin 38 of the 120pin MCM connector and pin 1 of the wastegate valve connector.
[b] If the voltage is less than 11 volts, Repair the open in the wire between pin 93 of the
120pin MCM connector and pin 4 of the wastegate valve connector.


8. Measure the resistance between pin 3 of the wastegate valve connector and pin 35 of the
120pin MCM connector.
[a] If the resistance is less than 3 , repair the open circuit in the wire between pin
3 of the wastegate valve connector and pin 35 of the 120pin MCM connector.
[b] If the resistance is greater than 5, replace the EPV3 solenoid.

codes.

31.3 SPN 704/FMI 5

32 SPN 706 - ELECTRONIC PROPORTIONING VALVE
CONTROL #2 NOT OPERATING NORMALLY
Section Page
32.1 SPN 706/FMI 3 ......................................................................................... 32-3

32.2 SPN 706/FMI 4 ......................................................................................... 32-5
32.3 SPN 706/FMI 5 ......................................................................................... 32-7
32.1 SPN 706/FMI 3
Check as follows:
1. Disconnect the Electronic Proportioning Valve #2 (EPV2) connector.
3. Measure the voltage between pin 1 of the EPV2 connector for the volute valve and
ground. See Figure 32-1.
Figure 32-1 EPV2 (Volute) and Wastegate
EPV2 connector and pin 66 of the 120pin MCM connector. Refer to section 32.1.1.1.
6. Measure the resistance between pins 1 and 2 of the EPV2 connector.
[a] If the resistance is greater than 5 , refer to section 32.1.1.1.
[b] If the resistance is less than 5 , repair the short between pins 1 and 2 of the EPV2
connector and pins 66 and 93 of the 120pin MCM connector. Refer to section
32.1.1.1.

32.1 SPN 706/FMI 3

4. Check for codes

32.2 SPN 706/FMI 4
Check as follows:
[a] If 704/4 is active with 706/4, repair the short to ground between pin 93 of the
120pin MCM connector and pin 2 of the EPV2 connector and pin 4 of the wastegate

2. Disconnect the EPV2 connector.
4. Measure the resistance between pins 1 and 2 of the EPV2 connector.
[a] If the resistance is less than 5 , repair the short between wires 66 and 93 of the
5. Measure the resistance between pin 1 of the EPV2 connector and ground.
[a] If the resistance is less than 5 , repair the short circuit between pin 1 of the EPV2
[b] If the resistance is greater than 5 , refer to section 32.2.1.1.

32.2 SPN 706/FMI 4

4. Check for codes

32.3 SPN 706/FMI 5
Check as follows:
1. Disconnect the EPV2 connector.
3. Measure the voltage between pins 1 and 2 of the EPV2 connector.
[a] If the voltage is between 11 and 13 volts, replace the EPV2. Refer to section 32.3.1.1.
4. Measure the voltage between pin two of the EPV2 connector and ground.
[a] If the voltage is between 11 and 13 volts, repair the open in the wire between pin
66 of the 120pin MCM connector and pin 1 of the EPV2 connector. See Figure
[b] If the voltage is less than 11 volts, repair the open in the wire between pin 93 of the
120pin MCM connector and pin 1 of EPV2 connector. Refer to section 32.3.1.1.

32.3 SPN 706/FMI 5

4. Check for codes

33 SPN 709 - SINGLE-SPEED FAN (LOW-SIDE DIGITAL
OUTPUT #3) FAULT
Section Page
33.1 SPN 709/FMI 3 ......................................................................................... 33-3

33.2 SPN 709/FMI 4 ......................................................................................... 33-5
33.3 SPN 709/FMI 5 ......................................................................................... 33-6
33.1 SPN 709/FMI 3
This fault code indicates that there is a short to power.

1. Put the ignition switch in the OFF position
2. Disconnect the fan control solenoid connector.
4. Measure the voltage between pin 1 of the fan control solenoid connector and ground.
[a] If the voltage is greater than 11.5 volts, repair the short to power between pin 1
of the fan control solenoid connector and pin 98 of the 120pin MCM connector.
[b] If the voltage is less than 11.5 volts, refer to section 33.1.2.
33.1.2 Voltage Check
The voltage check performed indicate that you should not be getting a code. The following
is a recheck before requesting a new MCM.
1. Turn vehicle ignition OFF. Reconnect all connectors.
2. Turn ignition ON. Clear codes with diagnostic tool.
[b] Of the voltage is less than 11.5 volts, contact the Detroit Diesel Customer Support


33.1 SPN 709/FMI 3
4. Check for codes

33.2 SPN 709/FMI 4
This fault code indicates that there is a short to ground.
Check for short to ground as follows:

4. Measure the resistance between pin 1 of the fan control solenoid connector and ground.
[a] If the resistance is less than 5 , repair the short to ground between pin 1 of
the fan control solenoid connector and pin 98 of the 120pin MCM connector.
[b] If the resistance is greater than 5 , repair the short to ground between pin 2 of
the fan control solenoid connector and pin 91 of the 120pin MCM connector.

4. Check for codes

33.3 SPN 709/FMI 5
33.3 SPN 709/FMI 5
This fault code indicates that there is an open circuit.

[a] If SPN 704/5, SPN 708/5, and SPN 709/5 are active, repair the open in between
pin 91 of the 120pin MCM connector and the fan and the Jake Brake solenoids.
[b] If only SPN 709/5 is active, go to step 2.
3. Turn the ignition to the ON position.
4. Measure the voltage between pin 1 and 2 of the fan control solenoid connector.
[b] If the voltage is between 11.5 and 13.5 volts, replace the fan control solenoid.
5. Measure the voltage between pin 2 of the fan control solenoid connector and pin 91 of
the 120pin MCM connector. Refer to section 33.3.1.1.
[a] If the voltage is less than 11.5 volts, repair the open between pin 2 of the fan control
solenoid connector and ground. Refer to section 33.3.1.1.
[b] If the voltage is greater than 11.5, repair the open between pin 1 of the fan control
solenoid connector and pin 98 of the 120pin MCM connector. Refer to section
33.3.1.1.

4. Check for codes

34 SPN 710 - ELECTRONIC PROPORTIONING VALVE
1 (ENTRY SHUTOFF FLAP) NOT OPERATING
NORMALLY
Section Page
34.1 SPN 710/FMI 3 ......................................................................................... 34-3

34.2 SPN 710/FMI 4 ......................................................................................... 34-4
34.3 SPN 710/FMI 5 ......................................................................................... 34-6
34.1 SPN 710/FMI 3
Check as follows:
1. Disconnect the EPV1 connector for the Entry Shutoff Flap.
3. Measure the voltage between pin 1 of the EPV1 connector for the Entry Shutoff Flap
and ground.
[a] If the voltage is greater than 11.5 volts, repair the short to power between pin 1 of
the EPV1 connector for the Entry Shutoff Flap and pin 96 of the 120pin MCM
Figure 34-1 EPV1 (Entry Shutoff Flap)

6. Measure the resistance between pins 1 and 2 of the EPV1 connector for the Entry Shutoff
Flap.
[a] If the resistance is greater than 5, reconnect the 120pin MCM connector and
repeat steps 2 through 6. If the results are the same, contact the Detroit Diesel
Customer Support Center (3135925800).
[b] If the resistance is less than 5, repair the short between pins 1 and 2 of the EPV1
connector for the Entry Shutoff Flap and pins 91 and 96 of the 120pin MCM

34.2 SPN 710/FMI 4

34.2 SPN 710/FMI 4
Check as follows:
[a] If 716/4 is active with 716/4, repair the short to ground between pin 91 of the 120pin
MCM connector and pin 2 of the EPV1 connector for the Entry Shutoff Flap and pin
21 of the 31pin connector. See Figure 34-2. Refer to section 34.2.1.1.


4. Measure the resistance between pins 1 and 2 of the EPV1 connector for the Entry Shutoff
Flap.
[a] If the resistance is less than 5 , repair the short between wires 91 and 96 of the
120pin connector. Refer to section 34.2.1.1.
5. Measure the resistance between pin 1 of the EPV1 connector for the Entry Shutoff Flap
and ground.
[a] If the resistance is less than 5 , repair the short between pin 1 of the EPV1 connector
for the Entry Shutoff Flap and ground. Refer to section 34.2.1.1.
[b] If the resistance is greater than 5 , repeat steps 4 and 5. If the results are the same,


34.3 SPN 710/FMI 5
34.3 SPN 710/FMI 5
Check as follows:
[a] If 716/3 is active with 716/3, repair the short to ground between pin 91 of the 120pin
MCM connector and pin 2 of the EPV1 connector for the Entry Shutoff Flap and pin
22 of the 31pin connector. Refer to section 34.3.1.1.
[b] If only code 710/5 is present, go to step 2.
3. Measure the resistance across pins 1 and 2 of the EPV1 connector for the Entry Shutoff
Flap.
[a] If the resistance is greater than 5, replace the EPV1 for the Entry Shutoff Flap.

5. Measure the voltage between pins 1 and 2 of the EPV1 connector for the Entry Shutoff
Flap.
[a] If the voltage is between 11.5 and 12.5, check the resistance again and then verify the
results. Refer to section 34.3.1.1.
[b] the EPV1 connector for the Entry Shutoff Fla go to step 6.

6. Measure the voltage between pin 2 of the EPV1 connector for the Entry Shutoff Flap
and ground.
[a] If the voltage is between 11.5 and 12.5, repair the open circuit between pin 1 of
the EPV1 connector for the Entry Shutoff Flap and pin 96 of the 120pin MCM
[b] If the voltage is less than 11.5 volts, repair the open circuit between pin 2 of the EPV1
connector for the Entry Shutoff Flap and pin 91 of the 120pin MCM connector.


34.3 SPN 710/FMI 5

35 SPN 729 - GRID HEATER NOT OPERATING
NORMALLY
Section Page
35.1 SPN 729/FMI 3 ......................................................................................... 35-3

35.2 SPN 729/FMI 4 ......................................................................................... 35-5
35.1 SPN 729/FMI 3
This diagnosis is typically a short to power/open.
35.1.1 Short to Power/Open Check
Check as follows:
1. Disconnect the Grid Heater connector.
3. Measure the voltage between pins 2 and 4 of the Grid Heater connector. See Figure 35-1.
Figure 35-1 Grid Heater Wiring

4. Measure the voltage between pin 2 of the Grid Heater connector and ground.
[a] If the voltage is greater than 11.5 volts, repair the open between pin 4 of the Grid
Heater connector and pin 95 of the 120pin MCM connector. Refer to section
35.1.1.1.
[b] If the voltage is less than 11.5 volts, repair the open between pin 2 of the Grid Heater
7. Measure the resistance between pins 2 and 3 of the Grid Heater connector.
[b] If the resistance is less than 5 , repair the short between Grid Heater pins 2 and 3
and pins 41 and 92 of the 120pin MCM connector. Refer to section 35.1.1.1.

35.1 SPN 729/FMI 3
8. Measure the resistance between pin 3 of the Grid Heater connector and pin 92 of the
[a] If the resistance is greater than 5 , repair the open between pin 3 of the Grid Heater
[b] If the resistance is less than 5 , replace the Grid Heater.


35.2 SPN 729/FMI 4
Check as follows:
1. Disconnect the Grid Heater connector.
3. Measure the resistance between pins 3 and 4 of the Grid Heater connector.
Grid Heater connector and pins 92 and 95 of the 120pin MCM connector.
4. Measure the resistance between pin 3 of the Grid Heater connector and ground.
[a] If the resistance is less than 5 , repair the short between pin 3 of the Grid Heater
[b] If the resistance is greater than 5 , replace the Grid Heater.


35.2 SPN 729/FMI 4

36 SPN 723 CAMSHAFT POSITION SENSOR FAULT
Section Page
36.1 SPN 723/FMI 3 ......................................................................................... 36-3

36.2 SPN 723/FMI 4 ......................................................................................... 36-5
36.3 SPN 723/FMI 8 ......................................................................................... 36-6
36.4 SPN 723/FMI 14 ....................................................................................... 36-7
36.1 SPN 723/FMI 3
The diagnostic condition is typically an open circuit.
Perform the following steps to troubleshoot an open circuit.
Figure 36-1 MCM Camshaft Position Sensor Schematic
1. Disconnect CMP Sensor

2. Measure the resistance across pins 1 and 2 of the CMP Sensor.See Figure 36-1.
[a] If the resistance is less than 140 , go to step 3.
[b] If the resistance is greater than 140 , replace the CMP Sensor. Refer to section
36.1.1.1.
4. Measure the resistance across pins 1 and 2 of the CMP harness connector.
[a] If the resistance is less than 5 , repair short between pins 1 and 2 of the CMP harness
connector and the pins 44 and 45 of the MCM 120 pin connector. Refer to section
36.1.1.1.
5. Measure the resistance between pin 1 of the CMP harness connector and pin 44 of the
MCM 120 pin connector
[a] If the resistance is greater then 5 , repair open between pin 1 of the CMP harness
connector and pin 44 of the MCM 120 pin connector. Refer to section 36.1.1.1.

36.1 SPN 723/FMI 3
MCM 120 pin connector.
[a] If the resistance is greater then 5 ohms, repair open between pin 2 of the CMP harness
connector and pin 45 of the MCM 120pin connector. Refer to section 36.1.1.1.
[b] If the resistance is less than 5 , review steps 2 through 6. If the results are the same,

2. Turn vehicle ignition ON.
4. Check the diagnostic tool for codes.
[b] If code 723/3 and any other codes are logged, and the CMP was not replaced,
replace the sensor and retest.
[c] If code 723/3 and any other codes are logged and the CMP was replaced, review
this section to find the error or contact Detroit Diesel Customer Support Center
(3135925800) for authorization to replace the MCM.
[d] If any codes except code 723/3 are logged, troubleshoot those codes.

36.2 SPN 723/FMI 4
A typical diagnosis is a short to ground.
Perform the following step to troubleshoot a short to ground.

1. Disconnect the CMP Sensor.
2. Measure the resistance between pin 1 of the CMP Sensor and ground. See Figure 36-2.
Figure 36-2 MCM Camshaft Position Sensor Schematic

[b] If the resistance is less than 5 , replace the CMP Sensor.Refer to section 36.2.1.1.
3. Measure the resistance between pin 2 of the CMP Sensor and ground.
[b] If the resistance is less than 5 , replace the CMP Sensor.Refer to section 36.2.1.1.
4. Disconnect 120-pin MCM connector.
5. Measure the resistance across pins 1 and 2 of the CMP harness connector.
CMP harness connector and pins 44 and 45 of the 120pin MCM connector.
6. Measure the resistance between pin 1 of the CMP harness connector and ground.

36.3 SPN 723/FMI 8
[b] If the resistance is less than 5 , repair the short to ground between pin 1 of the CMP
36.2.1.1.
[a] If the resistance is greater than 5 , review steps 2 through 7. If the results are the
same, contact Detroit Diesel Customer Support Center (3135925800).
[b] If the resistance is less than 5 , repair the short to ground between pin 2 of the CMP
36.2.1.1.

[b] If code 723/4 and any other codes are logged, and the Engine Oil Pressure Sensor
was not replaced, replace the sensor and retest.
[c] If any codes except code 723/4 are logged, troubleshoot those codes.
36.3 SPN 723/FMI 8
A typical diagnosis is time out.
36.3.1 Time Out Check
Perform the following steps to troubleshoot a time out.

1. Start and run the engine.
2. Check for active fault codes.
[a] If fault codes 723/3 and 723/8 are active, troubleshoot active fault code 723/3.
Refer to section 36.1.
[b] If fault codes 723/4 and 723/8 are not active, go to step 3.
[c] If fault codes 723/4 and 723/8 are active, refer to section 36.3.2.
3. Shutdown the engine.
4. Ensure that the sensor is correctly positioned and check for active codes.

[a] If the sensor position is correct and fault code 723/8 is active, refer to section 36.3.2.
[b] If the sensor position is incorrect and fault code 723/8 is not active, remove and
replace the camshaft sensor sleeve. Refer to section 36.3.2.1.
36.3.2 Camshaft Position Sensor Check
Perform the following steps to check the sensor.

1. Remove the Camshaft Position Sensor and ensure that the sensor bores are not damaged.
If damaged is present, repair as necessary. Refer to section 36.3.2.1.
2. Check the Camshaft Position Sensor for proper axial play. Repair as necessary if the axial
play is incorrect. Refer to section 36.3.2.1.

[b] If any codes except code s 723/8 are logged, troubleshoot those codes.
36.4 SPN 723/FMI 14
A typical diagnosis is swapped pins.
36.4.1 Swapped Pins Check
Perform the following step to troubleshoot pins swapped.

1. If fault code 723/14 is active, check the engine speed sensor for reversed polarity.
2. Reseat the camshaft and crankshaft sensors.

36.4 SPN 723/FMI 14
3. Ensure that the 120-pin connector wires are not crossed. If crossed, repair as necessary.
Figure 36-3 Camshaft Position Sensor

[b] If any codes except code s 723/14 are logged, troubleshoot those codes.

37 SPN 975 - TWO-SPEED FAN (AUX PWM #6) FAULT
Section Page
37.1 SPN 975/FMI 3 ......................................................................................... 37-3

37.2 SPN 975/FMI 4 ......................................................................................... 37-5
37.3 SPN 975/FMI 5 ......................................................................................... 37-6
37.1 SPN 975/FMI 3
This fault code indicates that there is a short to power.

[b] If the voltage is less than 11.5 volts, refer to section 37.1.2.
37.1.2 Voltage Check
The voltage check performed indicate that you should not be getting a code. The following
is a recheck before requesting a new MCM.
[b] Of the voltage is less than 11.5 volts, contact the Detroit Diesel Customer Support


37.1 SPN 975/FMI 3
4. Check for codes

37.2 SPN 975/FMI 4
This fault indicates that there is a short to ground.

1. Turn the vehicle ignition switch to the OFF position.
2. Disconnect the fan control solenoid.
4. Measure the resistance between pin 1 of the fan control solenoid and ground.
[a] If the resistance is less than 5 , repair the short to ground between pin 1 of the fan
control solenoid and pin 33 of the 120pin MCM connector. Refer to section 37.2.1.1.
[b] If the resistance is greater than 5 , repair the short to ground between pin 2 of the fan
control solenoid and pin 91 of the 120pin MCM connector. Refer to section 37.2.1.1.

4. Check for codes

37.3 SPN 975/FMI 5
37.3 SPN 975/FMI 5
This fault code indicates that there is an open circuit.

[a] If SPN 704/5, SPN 708/5, SPN 711/5 and SPN 975/5 are active repair the open in
between the pin 91 of the 120pin MCM connector and the fan and the Jake Brake
solenoids. Refer to section 37.3.1.1.
[b] If only SPN 711/5 is active, go to step 2.
3. Turn the ignition to the ON position.
4. Measure the voltage between pin 1 and 2 of the fan control solenoid connector.
[b] If the voltage is between 11.5 and 13.5 volts, replace the fan control solenoid.
[a] If the voltage is less than 11.5 volts, repair the open between pin 2 of the fan control
37.3.1.1.
[b] If the voltage is greater than 11.5, repair the open between pin 1 of the fan control
37.3.1.1.

4. Check for codes

38 SPN 1172 -TURBO COMPRESSOR IN TEMP HIGH
OR LOW
Section Page
38.1 SPN 1172/FMI 3 ....................................................................................... 38-3

38.2 SPN 1172/FMI 4 ....................................................................................... 38-5
38.1 SPN 1172/FMI 3
This code is typically sensor or circuit failed high.

1. Place ignition switch in the OFF position.
2. Disconnect the 31pin connector.
3. Measure the resistance between pin 27 and pin 28 of the 31pin connector on the truck
side.
[a] If the resistance is less than 55 , go to step 7.
4. Disconnect the Turbo Compressor In Temperature Sensor (TCI Sensor).
5. Measure the resistance between pin 1 and pin 2 of the TCI Sensor.
[a] If the resistance is greater than 50 , replace the sensor. Refer to section 38.1.2.1.
6. Measure the resistance between pin 1 of the TCI Sensor connector and pin 27 of the
31pin connector.
[a] If the resistance is greater than 3 , repair the open between pin 1 of the TCI Sensor
connector and pin 27 of the 31pin connector. Refer to section 38.1.2.1.
[b] If the resistance is less than 3 , repair the open between pin 2 of the TCI Sensor
connector and pin 28 of the 31pin connector. Refer to section 38.1.2.1.
8. Measure the voltage between pin 27 and pin 28 of the 31pin connector on the engine side.
[b] If the voltage is greater than 4.5 volts, refer to section 38.1.2.
9. Measure the voltage between pin 27 of the 31pin connector and ground.
[b] If the voltage is between 4.5 volts and 5.5 volts, repair the open between pin 28 of
the 31pin connector and pin 114 of the 120pin MCM connector. Refer to section
38.1.2.1.

38.1 SPN 1172/FMI 3

3. Measure the voltage between pin 27 and pin 28 of the 31pin connector on the engine side.
[a] If the voltage is less than 4.5 volts, refer to section 38.1.1, step 9.
[b] If the voltage is greater than 4.5 volts, contact the Detroit Diesel Customer Support

codes.

38.2 SPN 1172/FMI 4
This code is typically sensor or circuit failed low.

1. Place ignition switch in the OFF position.
2. Disconnect the 31pin connector.
3. Disconnect the TCI Sensor.
4. Measure resistance between pin 27 and pin 28 of the 31pin connector on the vehicle side.
[a] If the resistance is less than 10 , repair the short between pin 27 and pin 28 of the
31pin connector. Refer to section 38.2.1.1.
5. Measure resistance between pin 27 of the 31pin connector and ground on the vehicle side.
31pin connector and pin 1 of the TCI Sensor. Refer to section 38.2.1.1.
6. Measure resistance between pin 28 and ground on the vehicle side.
31pin connector and pin 2 of the TCI Sensor. Refer to section 38.2.1.1.
8. Measure resistance between pin 27 and pin 28 of the 31pin connector on the engine side.
[a] If the resistance is less than 10 , repair the short between pin 27 and pin 28 between
the 31pin connector and the 120pin MCM connector. Refer to section 38.2.1.1.
9. Measure resistance between pin 27 of the 31pin connector and ground on the engine side.
31pin connector and ground. Refer to section 38.2.1.1.
10. Measure resistance between pin 28 of the 31pin connector and ground on the engine side.
31pin connector and ground. Refer to section 38.2.1.1.
[b] If the resistance is greater than 5 , contact the Detroit Diesel Customer Support

38.2 SPN 1172/FMI 4

codes.

39 SPN 1176 - TURBO COMPRESSOR INLET
PRESSURE OUTSIDE NORMAL RANGE
Section Page
39.1 SPN 1176/FMI 3 ....................................................................................... 39-3

39.2 SPN 1176/FMI 4 ....................................................................................... 39-5
39.1 SPN 1176/FMI 3
Check for a short to power as follows:

[a] If 1176/3, 1172/3, 100/3 and 175/3 are present, repair the open between pin 105 on
the 120pin MCM connector and the associated sensors. Refer to section 39.1.1.1.
[b] If 1176/3 and 1172/3 are present, go to step 7.
3. Turn the ignition switch OFF.
4. Disconnect the Turbo Pressure/Temp Sensor.
6. Measure the resistance between pins 1 and 2 of the Turbo Pressure/Temp Sensor harness
connector.
[a] If the resistance is greater than 5 , repair the short to power on the circuit between
pin 120 of the 120pin MCM connector and pin 1 of the Turbo Pressure/Temp Sensor
harness connector. Refer to section 39.1.1.1.
8. Measure the resistance between pins 2 and 4 of the Turbo Pressure/Temp Sensor.
[a] If the resistance is greater than 140 , replace the Turbo Pressure/Temp Sensor.
10. Measure the voltage between pin 2 of the Turbo Pressure/Temp Sensor and ground.
[a] If the voltage is greater than 2.75 volts, repair the open circuit between pin 105
of the 120pin MCM connector and pin 4 of the Turbo Pressure/Temp Sensor.
the 120pin MCM connector and pin 2 of the Turbo Pressure/Temp Sensor.

39.1 SPN 1176/FMI 3

6. Stop engine.
codes.

39.2 SPN 1176/FMI 4
This diagnosis is typically an open short to ground.
39.2.1 Open or Short Circuit Check
Check for an open short to ground as follows:

[a] If 1176/4, 1172/4, 3610/4, 3609/4, 3250/4, 3242/4 and 3246/4 are present, repair the
open between pin 85 on the 120pin MCM connector and the associated sensors.
[b] If 1176/4 and 1172/4 are present, repair the open between pin 85 on the 120pin MCM
connector and pin 2 on the Turbo Pressure/Temp Sensor. Refer to section 39.2.1.1.
3. Turn the ignition switch OFF.
[a] If the resistance is greater than 130k , replace the Turbo Pressure/Temp Sensor.
[a] If the resistance is greater than 130k , replace the Turbo Pressure/Temp Sensor.
8. Measure the resistance between pins 1 and 4 of the Turbo Pressure/Temp Sensor harness
connector.
9. Measure the voltage between pin 1 of the Turbo Pressure/Temp Sensor and ground.

39.2 SPN 1176/FMI 4
[a] If the resistance is greater than 5 , repair the open between pin 1 of the Turbo
Pressure/Temp Sensor and pin 120 of the 120pin MCM connector. See Figure
Figure 39-1 Turbo Pressure/Temp Sensor Wiring
[b] If the resistance is less than 5 , repair the short to ground circuit between pin 120 of
the 120pin MCM connector and ground. See Figure 39-1. Refer to section 39.2.1.1.

codes.

40 SPN 1636 INTAKE MANIFOLD TEMPERATURE
Section Page
40.1 SPN 1636 /FMI 2 ...................................................................................... 40-3

40.2 SPN 1636/FMI 3 ....................................................................................... 40-4
40.3 SPN 1636/FMI 4 ....................................................................................... 40-6
40.4 SPN 1636/FMI 14 ..................................................................................... 40-7
40.1 SPN 1636 /FMI 2
This diagnostic condition is typically erratic data.
40.1.1 Erratic Data Source Check
Check for the source of erratic data as follows:
NOTE:
When diagnosing rationality erratic data faults always refer to any SIBs first for any
known issues.
1. Check the air intake, CAC EGR system integrity and the intake throttle system integrity.
2. Connect the diagnostic tool.
3. Monitor the engine RPM, engine coolant temperature, intake manifold temperature, EGR
temperature, EGR PW and EGR Delta P counts.
4. With the engine at idle and the coolant temperature above 160, are the EGR PW less than
7% and the EGR Delta P counts less than 135 (NO EGR FLOW)? Is the intake manifold
temperature within __ of the EGR temperature?
5. Disconnect the Intake Manifold Pressure/Temp Sensor and the 120pin MCM connector.
6. Bridge pins 1 and 2 of the Intake Manifold Pressure/Temp Sensor, measure the resistance
at pins 52 and 106 of the 120pin MCM connector.
[a] If the resistance is greater than 3 , repair the harness. Refer to section 40.1.1.1.
7. With the engine running at 1500 rpm and coolant temperature above 160, command
EGR PW to 50% (EGR Delta P counts will also rise because of EGR flow). Is the intake
manifold temperature within __ of the EGR temperature?
[b] If no, replace the sensor. Refer to section 40.1.1.1.


40.2 SPN 1636/FMI 3

codes.
40.2 SPN 1636/FMI 3
The diagnostic condition is typically Intake Manifold Temperature Sensor Open Circuit. The
following procedures will troubleshoot SPN 1636/3.
Perform the following steps to troubleshoot a short to power fault:

1. With the Intake Manifold Pressure/Temperature Sensor connected, check for multiple
codes.
[a] If fault codes 1636/3 and 3563/3 are active, repair open circuit between pin 102 of
the 120-pin MCM connector and pin 4 of the sensor. Refer to section 40.2.1.1.
[b] If only fault code 1636/3 is active, go to step 2.
2. Disconnect the Intake Manifold Pressure/Temperature Sensor.
4. Measure the resistance between pins 3 and 4 of the Intake Manifold Pressure/Temperature
Sensor harness connector.

[b] If the resistance is more than 5 , repair the short to power on the circuit between
pin 119 of the 120pin MCM connector and pin 3 of the Intake Manifold
Pressure/Temperature Sensor. See Figure 40-1. Refer to section 40.2.1.1.
Figure 40-1 Intake Manifold Pressure/Temp Sensor Wiring

6. Stop engine.
codes.

40.3 SPN 1636/FMI 4
40.3 SPN 1636/FMI 4
A typical diagnosis is Intake Manifold Pressure/Temp Sensor Open Short to Ground.
40.3.1 Intake Manifold Pressure/Temp Sensor Open or Short to Ground

Check
Perform the following steps to troubleshoot an Intake Manifold Pressure/Temp Sensor open or
short to ground fault:
[a] If fault code 1636/4 and 3563 are both active, repair the open between pin 58 of the
120pin MCM connector and pin 2 of the Intake Manifold Pressure/Temp Sensor.
2. Disconnect the Intake Manifold Pressure/Temp Sensor.
3. Measure the resistance between pins 3 and 4 of the Intake Manifold Pressure/Temp Sensor.
[a] If resistance is greater than 130k , replace the sensor. Refer to section 40.3.1.1.
[b] If resistance is less than 130k , go to step 5.
5. Measure the voltage between pin 3 of the Intake Manifold Pressure/Temp Sensor and
ground.
[b] If the voltage is less than 2.75 volts, repair the open between pin 3 of the Intake
Manifold Pressure/Temp Sensor and pin 119 of the 120pin MCM connector.
Figure 40-2 Intake Manifold Pressure/Temp Sensor Wiring


8. Measure the resistance between pins 3 and 4 of the Intake Manifold Pressure/Temp Sensor
harness connector.
[a] If resistance is greater than 5 , repair the short to power on the circuit between pin
119 of the 120pin MCM connector and pin 3 of the Intake Manifold Pressure/Temp
Sensor harness connector. Refer to section 40.3.1.1.
[b] If resistance is less than 5 , repair the short between wires 102 and 119 of the

6. Stop engine.
codes.
40.4 SPN 1636/FMI 14
This code indicates that the Intake Manifold Temperature Sensor has failed a self test.
40.4.1 Temperature Check
Check the temperature as follows:
NOTE:
Prior to performing this diagnostic procedure the engine must have a minimum of a three
hour soak (cool down).
1. Connect DDDL.

40.4 SPN 1636/FMI 14
3. Monitor the intake manifold, engine oil, engine coolant, EGR and turbo outlet temperature
parameters.
4. Are any of the temperature readings 15F greater or less than that of the other sensors?
[a] If yes, inspect the suspect temperature sensors electrical connector for corrosion,
bent or spread pins, repair as necessary. If there are no repairs, replace suspect
temperature sensor. Refer to section 40.4.1.1.
5. Prepare DDDL for a snapshot.
6. Start the engine, idle for 30 seconds, then TURN THE ENGINE OFF.
7. Review the the intake manifold, engine oil, engine coolant, EGR and turbo outlet
temperature parameters on snapshot.
8. Are any of the temperature readings 20F greater or less than that of the other sensors?
[a] If yes, inspect the suspect temperature sensors electrical connector for corrosion,
bent or spread pins, repair as necessary. If there are no repairs, replace suspect
temperature sensor. Refer to section 40.4.1.1.
[b] If no, review steps 3 through 8. If the results are the same, contact the Detroit Diesel
Customer Support Center (3135925800).

codes.

41 SPN 2791 EGR VALVE (AUX PWM #1) FAILED OR
OPEN CIRCUIT
Section Page
41.1 SPN 2791/FMI 3 ....................................................................................... 41-3

41.2 SPN 2791/FMI 4 ....................................................................................... 41-5
41.3 SPN 2791/FMI 5 ....................................................................................... 41-6
41.1 SPN 2791/FMI 3
This diagnostic condition is typically a short to power fault.

3. Measure the voltage between pin 1 of the EGR valve connector and ground.
EGR valve connector and pin 61 of the 120pin MCM connector. Refer to section
41.1.2.1.
[a] If the resistance is less than 5 , repair the short between pin 1 and pin 2 of the EGR
valve connector and pin 61 and 62 of the 120pin MCM connector. Refer to section
41.1.2.1
[b] If the resistance is less than 5 , refer to section 41.1.2.
1. Turn ignition ON. Reconnect all connectors.
4. Measure the voltage between pin 1 of the EGR valve connector and ground.
EGR valve connector and pin 61 of the 120pin MCM connector. Refer to section
41.1.2.1.

41.1 SPN 2791/FMI 3
[a] If the resistance is less than 5 , repair the short between pin 1 and pin 2 of the EGR
valve connector and pin 61 and 62 of the 120pin MCM connector. Refer to section
41.1.2.1.
[b] If the resistance is less than 5 , call the Detroit Diesel Customer Support Center

1. Turn the vehicle OFF. Reconnect all connectors.
4. Check for codes

41.2 SPN 2791/FMI 4
This diagnosis is typically short to ground.

1. Disconnect EGR valve connector.
2. Disconnect 120pin MCM connector.
3. Measure the resistance between pin 1 of the EGR valve connector and ground.
[a] If the resistance is less than 5 , repair the short circuit between pin 1 of the EGR
valve connector and ground. Refer to section 41.2.2.1.
[b] If the resistance is greater than 5 , Refer to section 41.2.2.1.
3. Disconnect EGR valve connector.
4. Disconnect 120pin MCM connector.
[b] If the resistance is greater than 5 , call the Detroit Diesel Customer Support Center

41.3 SPN 2791/FMI 5

4. Check for codes
41.3 SPN 2791/FMI 5
This diagnostic condition is typically an open circuit fault.

3. Measure the voltage between pin 2 and pin 3 of the EGR valve connector.
[a] If the voltage is between 11 and 13 volts, go to step 6.
4. Measure voltage between pin 2 of EGR valve connector and ground.
[a] If the voltage is between 11 and 13 volts, repair the open in the wire between
pin 95 of the 120pin MCM connector and pin 3 of the EGR valve connector.
5. Turn the ignition OFF and measure the resistance between pin 2 of EGR valve connector
and pin 62 of the 120pin MCM connector.
[a] If the resistance is greater than 3 , repair the open circuit in the wire between pin 62
of the 120pin MCM connector and pin 2 of EGR valve connector. Refer to section
41.3.1.1.
[b] If the resistance is less than 3 , replace the MCM.
6. Turn the ignition OFF and measure the resistance between pin 1 of the EGR valve
connector and pin 61 of the 120pin MCM connector.

[a] If the resistance is greater than 3 , repair the open circuit in the wire between pin 61
of the 120pin MCM connector and pin 1 of EGR valve connector. Refer to section
41.3.1.1.
[b] If the resistance is less than 3 , replace the EGR valve.

4. Check for codes

41.3 SPN 2791/FMI 5

42 SPN 3510 ACCELERATOR PEDAL SUPPLY
Section Page
42.1 SPN 3510/FMI 2 ....................................................................................... 42-3

42.2 SPN 3510/FMI 3 ....................................................................................... 42-5
42.3 SPN 3510/FMI 4 ....................................................................................... 42-6
42.1 SPN 3510/FMI 2
This fault indicates that the throttle pedal supply is receiving erratic data.
Check for erratic data as follows:

3. Measure the voltage between pins 1 and 3 of the AP harness connector. See Figure 42-1.

[a] If the voltage is between 4.5 and 5.5 volts, repair the open circuit between pin 3 of the
AP harness connector and pin 4 of the CPC #1 connector. Refer to section 42.1.1.1.
connector and pin 8 of the CPC #1 connector. Refer to section 42.1.1.1.

42.1 SPN 3510/FMI 2
#1 connector.
[a] If the resistance is greater than 3 , repair the open between pin 2 of the AP harness
42.1.1.1.

codes.

42.2 SPN 3510/FMI 3
The typical diagnosis for this fault is high voltage.
42.2.1 High Voltage Check
Check for high voltage as follows:

[a] If the voltage is between 4.5 and 5.5 volts, repair the open circuit between pin 3 of the
AP harness connector and pin 4 of the CPC #1 connector. Refer to section 42.2.1.1.
#1 connector.
42.2.1.1.

codes.

42.3 SPN 3510/FMI 4
42.3 SPN 3510/FMI 4
The typical diagnosis for this fault is voltage low.
42.3.1 Low Voltage Check
Perform the following steps to troubleshoot low voltage.

1. Disconnect the Accelerator Pedal (AP) connector.
2. Disconnect the #1 connector of the CPC.
3. Measure the resistance between pin 1 and pin 3 of the AP connector.
#1 connector. Refer to section 42.3.1.1.
4. Measure the resistance between pin 2 and 3 of the AP connector.
#! connector. Refer to section 42.3.1.1.
[b] If the resistance is greater than 5 , replace the Accelerator Pedal. Refer to section
42.3.1.1.


codes.

42.3 SPN 3510/FMI 4

43 SPN 3563 INTAKE MANIFOLD PRESSURE
OUTSIDE NORMAL RANGE
Section Page
43.1 SPN 3563/FMI 0/1/2 ................................................................................. 43-3

43.2 SPN 3563/FMI 3 ....................................................................................... 43-6
43.3 SPN 3563/FMI 4 ....................................................................................... 43-8
43.1 SPN 3563/FMI 0/1/2
The following procedures will troubleshoot SPN 3563/FMI 0/1/2, intake manifold pressure
high or low or erratic data.
43.1.1 Code Check
Perform the following steps to check for codes:

1. Turn the vehicle ON.
2. Using the diagnostic tool, check for codes
3. Check for historic fault codes in addition to 3563/0/1/2.
[a] If other historic fault codes are present, troubleshoot other fault codes first.
[b] If only fault code 3563/0 or 3563/1 or 3563/2 is present, refer to section 43.1.2.
43.1.2 Low (Boost) Pressure Check
Perform the following steps to troubleshoot an intake manifold (boost) pressure low fault:
1. Check for a restricted air filter or air intake system.
[a] If the air filter or air intake system is restricted, replace the air filter and/or eliminate
the restriction in the air intake system. Refer to section 43.1.3.1.
[b] If the air filter or air intake system is not restricted, go to step 2.
2. Check the condition of the boost air sensor.
[a] If sensor is not in good condition, replace sensor. Refer to section 43.1.3.1.
[b] If sensor is in good condition, go to step 3.
3. Visually inspect the CAC (charge air cooler) and the CAC hoses for leaks.
[a] If leaks are found, repair or replace the CAC and/or CAC hoses. Refer to section
43.1.3.1.
[b] If no leaks are found, go to step 4.
4. Check for a faulty turbocharger (compressor wheel does not spin freely or is rubbing
on side walls).
[a] If the turbocharger is faulty, replace it. Refer to section 43.1.3.1.
[b] If the turbocharger is not faulty, go to step 5.
5. Verify that fuel delivery is within specifications (no restrictions to fuel flow).
[a] If fuel delivery is not within specifications, eliminate restrictions in fuel delivery
system. Refer to section 43.1.3.1.
[b] If fuel delivery is within specifications, check for erratic data. Refer to section 43.1.3.

43.1 SPN 3563/FMI 0/1/2
Perform the following steps to check for erratic data:

1. Turn the vehicle ignition switch ON with the engine OFF.
2. Find the altitude for your local area and use Table 1 to determine the kPa value for the
local altitude.
3. Open DDDL and change the units to metric. (Tool menu > Options > Metric).
4. Using DDDL, read the value of the Barometric Pressure Sensor. The value should be
within X kPa of the value in Table 1.
[a] If the value is greater than X kPa, replace the Intake Manifold Pressure/Temp Sensor.
[b] If the value is less than X kPa,, go to step 5.
5. Using DDDL, read the value of the Barometric Pressure Sensor. The value should be
within X kPa of the value in Table 1.
[a] If the value is greater than X kPa, replace the Barometric Pressure Sensor. Due to its
location in the MCM, replacing the Barometric Pressure Sensor means replacing the
MCM.Refer to section 43.1.3.1.
[b] If the value is less than X kPa,, go to step 6.
6. Start the engine and run at idle.
7. Using DDDL, read the value of the Intake Manifold Pressure/Temp Sensor (boost
pressure). The value should be within X kPa of 0.00.
[a] If the value is not within X kPa, replace the Intake Manifold Pressure/Temp Sensor.
[b] If the value is within X kPa, go to step 8.
8. Using DDDL, read the value of the Barometric Pressure Sensor.
[a] If the value is not within X kPa, replace the Barometric Pressure Sensor. Due to its
[b] If the value is within X kPa,, go to step 9.
9. Run the engine to 1500 rpm.
10. Using DDDL, read the value of the Intake Manifold Pressure/Temp Sensor (boost
pressure). The value should be X kPa at 1500 rpm.
[a] If the value is not within 2 kPa, replace the sensor.
[b] If the value is within 2 kPa, go to step 11.
11. Using DDDL, read the value of the Barometric Pressure Sensor.

[a] If the value is not within X kPa, replace the Barometric Pressure Sensor. Due to its
[b] If the value is within X kPa, contact Detroit Diesel Customer Support Center
(3135925800).

[b] If code 3563/0/1/2 is not logged, and other codes are logged, troubleshoot the logged
codes.
[c] If code 3563/0/21 and other codes are logged, review this section to find the error. If
no error is found, call the Detroit Diesel Customer Support Center (3135925800).

43.2 SPN 3563/FMI 3
43.2 SPN 3563/FMI 3
The following procedures will troubleshoot SPN 3563/FMI 3, Intake Manifold Pressure/Temp
Sensor short to power.
Perform the following steps to check for a short to power:

[a] If fault code 3563/3 and 1636/3 are present, repair open circuit between pin 102 of
the 120-pin MCM connector and pin 4 of the Intake Manifold Pressure/Temp Sensor.
[b] If only fault code 3563/3 is present, go to step 2.
3. Disconnect the 120-pin MCM connector.
harness connector. See Figure 43-1.
Figure 43-1 Intake Manifold Pressure/Temp Sensor
[a] If the resistance is greater than 5 , repair short to power in the circuit between pin
87 of the 120-pin MCM connector and pin 1 of the Intake Manifold Pressure/Temp
Sensor. See Figure 43-1. Refer to section 43.2.1.1.
[b] If the resistance is less than 5 , repair the short between wire 58 and 87 of the
120-pin MCM connector. See Figure 43-1. Refer to section 43.2.1.1.


codes.

43.3 SPN 3563/FMI 4
43.3 SPN 3563/FMI 4
The following procedures will troubleshoot SPN 3563/FMI 4, Intake Manifold Pressure/Temp
Sensor short to ground.
43.3.1 Open or Short to Ground Check
Perform the following steps to check for an open short to ground:

[a] If faults 3563/4 and 1636/4 are present, go to step 2.
[b] If only 3563/4 is present, go to step 7.
3. Measure the resistance between pins 1 and 2 of the Intake Manifold Pressure/Temp
Sensor. See Figure 43-2.
Figure 43-2 Intake Manifold Pressure/Temp Sensor
[a] If resistance is greater than 130k , replace the sensor.Refer to section 43.3.1.1.
4. Measure the resistance between pins 2 and 4 of the Intake Manifold Pressure/Temp
Sensor. See Figure 43-2.
[a] If resistance is greater than 130k , replace the sensor.Refer to section 43.3.1.1.
6. Measure the voltage between pin 2 of the Intake Manifold Pressure/Temp Sensor and
ground.

[a] If the voltage is greater than 2.75 volts, repair the open between pin 4 of the Intake
[b] If the voltage is less than 2.75 volts, repair the open between pin 2 of the Intake
8. Disconnect the Intake manifold Pressure/Temp Sensor.
harness connector.
[a] If the resistance is greater than 5 , repair the short to power on the circuit
between pin 87 of the 120pin MCM connector and pin 1 of the Intake Manifold
Pressure/Temp Sensor harness connector. Refer to section 43.3.1.1.

codes.

43.3 SPN 3563/FMI 4

44 SPN 3659 ELECTRONIC UNIT PUMP #1 NOT
OPERATING NORMALLY
Section Page
44.1 SPN 3659/FMI 5 ....................................................................................... 44-3

44.2 SPN 3659/FMI 10 ..................................................................................... 44-5
44.1 SPN 3659/FMI 5
This diagnosis is typically the Electronic Unit Pump current is below normal or an open circuit
fault.

12.2.
[b] If fault 3660/5 and 3661/5 are active in addition to 3659/5, contact the Detroit Diesel
Check as follows:
1. The ignition should still be ON.
2. Measure the voltage between pins 1 and 2 of Electronic Unit Pump #1. See Figure 44-1.
Figure 44-1 Electronic Unit Pump #1
[a] If the voltage is greater than 11.5 volts, replace Electronic Unit Pump #1.
3. Measure the voltage between pin 1 of Electronic Unit Pump #1 and ground.

44.1 SPN 3659/FMI 5
[a] If the voltage is greater than 11.5 volts, repair the open between pin 14 of the 120pin
MCM connector and pin 2 of Electronic Unit Pump #1. Refer to section 44.1.2.1.
[b] If the voltage is less than 11.5 volts, repair the open between pin 15 of the 120pin

4. Check for codes

44.2 SPN 3659/FMI 10
Check as follows:
3. Disconnect pins 1 and 2 of Electronic Unit Pump #1.
4. Measure the resistance between pins 1 and 2 of the Electronic Unit Pump #1 harness.
See Figure 44-2.
Electronic Unit Pump #1 harness and pins 15 and 14 of the 120pin MCM
5. Measure the resistance between pin 1 of the Electronic Unit Pump #1 harness and ground.
[a] If the resistance is less than 5 , repair the short to ground between pin 1of the
Electronic Unit Pump #1 harness and pin 15 of the MCM 120pin connector.
the Electronic Unit Pump #1 harness and pin 14 of the MCM 120pin connector.

44.2 SPN 3659/FMI 10

4. Check for codes

45 SPN 3660 - ELECTRONIC UNIT PUMP #2 NOT
OPERATING NORMALLY
Section Page
45.1 SPN 3660/FMI 5 ....................................................................................... 45-3

45.2 SPN 3660/FMI 10 ..................................................................................... 45-5
45.1 SPN 3660/FMI 5
fault.

1. Turn the vehicle ignition switch ON.
12.2.
Check as follows:
3. Measure the voltage between pin 1 of the Electronic Unit Pump #2 and ground.

45.1 SPN 3660/FMI 5

4. Check for codes

45.2 SPN 3660/FMI 10
Check as follows:
3. Disconnect pins 1 and 2 of Electronic Unit Pump #2. See Figure 45-2.
Electronic Unit Pump #2 harness and pins 11 and 10 of the 120pin MCM connector.

45.2 SPN 3660/FMI 10

4. Check for codes

OPERATING NORMALLY
Section Page
46.1 SPN 3661/FMI 5 ....................................................................................... 46-3

46.2 SPN 3661/FMI 10 ..................................................................................... 46-5
46.1 SPN 3661/FMI 5
fault.

12.2.
46.1.2 Check for Open Circuits
Check as follows:
[a] If the voltage is greater than 11.5 volts, replace Electronic Unit Pump # 3.

46.1 SPN 3661/FMI 5

4. Check for codes

46.2 SPN 3661/FMI 10
This diagnostic condition is typically a short.
Check as follows:
Electronic Unit Pump #3 harness and pins 13 and 102 of the 120pin MCM

46.2 SPN 3661/FMI 10

4. Check for codes

OPERATING NORMALLY
Section Page
47.1 SPN 3662/FMI 5 ....................................................................................... 47-3

47.2 SPN 3662/FMI 10 ..................................................................................... 47-5
47.1 SPN 3662/FMI 5
fault.

1. Turn the vehicle ignition switch ON.
12.2.
Check as follows:

47.1 SPN 3662/FMI 5

4. Check for codes

47.2 SPN 3662/FMI 10
Check as follows:

47.2 SPN 3662/FMI 10

4. Check for codes

OPERATING NORMALLY
Section Page
48.1 SPN 3663/FMI 5 ....................................................................................... 48-3

48.2 SPN 3663/FMI 10 ..................................................................................... 48-5
48.1 SPN 3663/FMI 5
fault.

12.2.
Check as follows:

48.1 SPN 3663/FMI 5

4. Check for codes

48.2 SPN 3663/FMI 10
Check as follows:

48.2 SPN 3663/FMI 10

4. Check for codes

OPERATING NORMALLY
Section Page
49.1 SPN 3664/FMI 5 ....................................................................................... 49-3

49.2 SPN 3664/FMI 10 ..................................................................................... 49-5
49.1 SPN 3664/FMI 5
fault.

12.2.
Customer Support Center (3135925800) for MCM replacement. Refer to section
49.1.2.1.
Check as follows:

49.1 SPN 3664/FMI 5

4. Check for codes

49.2 SPN 3664/FMI 10
Check as follows:

49.2 SPN 3664/FMI 10

4. Check for codes

50 CPC DIGITAL OUTPUTS SPN/FMI
Section Page
50.1 CPC DIGITAL OUTPUT FAULT CODES ................................................. 50-3

50.2 TROUBLESHOOTING THE CPC DIGITAL OUTPUTS ........................... 50-3
50.1 CPC DIGITAL OUTPUT FAULT CODES
These CPC digital outputs have the same SPN as some MCM faults. DDDL for DDEC VI makes
the distinction between the MCM and CPC when diagnosing a fault.
50.2 TROUBLESHOOTING THE CPC DIGITAL OUTPUTS
These faults deal with procedures that must be supplied by the OEMs. The CPC digital output
SPNs and FMIs are listed in Table 50-1.
Module SPN FMI Description

ASG2 BACKUP LAMP - indicates a short to power/open circuit on pin 9 of the
CPC 703 3
CPC #3 connector. For wiring schematic information refer to OEM literature.
ASG2 BACKUP LAMP - indicates a short to ground on the pin 9 circuit of the
CPC 703 4
HIGH EXHAUST TEMP LAMP - indicates a short to power/open circuit on
CPC 704 3 pin 7 of the CPC #4 connector. For wiring schematic information refer to
OEM literature.
HIGH EXHAUST TEMP LAMP - indicates a short to ground on the pin 7
CPC 704 4 circuit of the CPC #4 connector. For wiring schematic information refer to
OEM literature.
MIL LAMP - indicates a short to power/open circuit on pin 13of the CPC #1
CPC 705 3
connector. For wiring schematic information refer to OEM literature.
MIL LAMP - indicates a short to ground on the pin 13 circuit of the CPC #1
CPC 705 4
connector. For wiring schematic information refer to OEM literature.
ASG2 CHECK TRANS TEMP LAMP - indicates a short to power/open circuit
CPC 706 3 on pin 10 of the CPC #3 connector. For wiring schematic information refer to
OEM literature.
ASG2 CHECK TRANS TEMP LAMP - indicates a short to ground on the pin
CPC 706 4 10 circuit of the CPC #3 connector. For wiring schematic information refer to
OEM literature.
Amber Warning Lamp (AWL) - indicates a short to power/open circuit on
OEM literature.
Amber Warning LAMP (AWL) - indicates a short to ground on the pin 10
OEM literature.
ASG2 CHECK TRANS LAMP - indicates a short to power/open circuit on
OEM literature.
ASG2 CHECK TRANS LAMP - indicates a short to ground on the pin 12
OEM literature.
RED STOP LAMP (RSL) - indicates a short to power/open circuit on pin 16
CPC 709 3 of the CPC #3 connector. For wiring schematic information refer to OEM
literature.

50.2 TROUBLESHOOTING THE CPC DIGITAL OUTPUTS
Module SPN FMI Description

RED STOP LAMP (RSL) - indicates a short to ground on the pin 16 circuit
literature.
DPF REGEN LAMP - indicates a short to power/open circuit on pin 5 of the
CPC 711 3
DPF REGEN LAMP - indicates a short to ground on the pin 5 circuit of the
CPC 711 4
TOP2 LOCKOUT SOLENOID - indicates a short to power on the pin 7
OEM literature.
TOP2 LOCKOUT SOLENOID - indicates a short to ground circuit on pin 7
literature.
TOP2 LOCKOUT SOLENOID - indicates a open circuit on the pin 7 circuit
literature.
TOP2 SHIFT SOLENOID - indicates a short to power on the pin 8 circuit CPC
CPC 714 3
#3 connector. For wiring schematic information refer to OEM literature.
TOP2 SHIFT SOLENOID - indicates a short to ground circuit on pin 8 of the
CPC 714 4
TOP2 SHIFT SOLENOID - indicates a open circuit on the pin 8 circuit of the
CPC 714 5 CPC #3 connector. For wiring schematic information refer to OEM literature.
VEHICLE POWER SHUTDOWN - indicates a short to power on the pin 10

OEM literature.
VEHICLE POWER SHUTDOWN - indicates a short to ground circuit on
OEM literature.
VEHICLE POWER SHUTDOWN - indicates a open circuit on the pin 10
OEM literature.
Table 50-1 CPC Digital Output Faults

INDEX
C
Common Powertrain Controller, 2-13
Connectors, 2-21
Common Powertrain Controller (CPC)
environmental conditions, 2-15
Conduit and Loom, 2-39
Criteria, 2-39
Connectors
deutsch connector, 2-23
D
Deutsch Connectors, 2-26
Deutsch Terminals
installation, 2-26
removal, 2-28
E
Engine Harness (EH)
120pin connector, mbe4000, 2-5
I
Introduction, 1-3
M
Motor Control Module (MCM)
120pin connector, mbe4000, 2-52-8
21pin connector, 2-10
S
Safety Precautions, 1-6
Batteries, 1-14
Cleaning Agent, 1-15
Detroit Diesel Diagnostic Link, 1-15
Ether Start, 1-8
Exhaust (Start/Run Engine), 1-9
Fire, 1-15

6SE568 Copyright PRELIMINARY 2007 DETROIT DIESEL CORPORATION Index-1
INDEX
Fuel, 1-13
Glasses, 1-9
Optimized Idle, 1-17
Pressurized Fluids, 1-12
Welding, 1-11
Working on a Running Engine, 1-16
SPN 100/FMI 1, 7-3
Check Low Oil Pressure, 7-3
SPN 100/FMI 14, 7-10
Check for Multiple Codes, 7-10
Check Oil Pressure, Oil Pump and Oil Gauges, 7-10
SPN 100/FMI 2, 7-5
Check for Erratic Data From the Engine Oil Pressure Sensor, 7-5
SPN 100/FMI 3, 7-6
Check for Short to Ground, 7-6
SPN 100/FMI 4, 7-8
Check for an Open Short to Ground, 7-8
SPN 103/FMI 0, 8-3
Check Equipment, 8-3
SPN 103/FMI 1, 8-4
Check Equipment, 8-4
SPN 103/FMI 3, 8-5
Check for Open, 8-5
Resistance and Voltage Check, 8-6
SPN 103/FMI 4, 8-7
Check for Short, 8-7
Resistance Check, 8-8
SPN 103/FMI 7, 8-9
Adjust the Turbo Speed Sensor Air Gap, 8-9
Check the Turbo Speed Sensor, 8-9
SPN 110, 9-3
Multiple Code Check, 9-3
SPN 110/FMI 14, 9-9
System Checks to Resolve Fault, 9-9

Index-2 6SE568 Copyright PRELIMINARY 2007 DETROIT DIESEL CORPORATION
SPN 110/FMI 3
Open Circuit Check, 9-5
SPN 110/FMI 4, 9-7
SPN 1172/FMI 3, 38-3
Check for Open, 38-3
SPN 1172/FMI 4, 38-5
Short Circuit Check, 38-5
SPN 1176/FMI 3, 39-3
Check for a Short to Power, 39-3
SPN 1176/FMI 4, 39-5
Open or Short Circuit Check, 39-5
SPN 1636 /FMI 2, 40-3
Erratic Data Source Check, 40-3
SPN 1636/FMI 14, 40-7
Temperature Check, 40-7
SPN 1636/FMI 3, 40-4
Short to Power Check, 40-4
SPN 1636/FMI 4, 40-6
Intake Manifold Pressure/Temp Sensor Short to Ground, 40-6
SPN 168/FMI 0, 12-3
Measure Battery Voltage, 12-3
SPN 174/FMI 3, 13-3
Check for Open Circuit, 13-3
SPN 174/FMI 4, 13-5
SPN 175/FMI 2, 14-3
Rationality Check, 14-3
SPN 175/FMI 3, 14-5
Check for Short to Power, 14-5
SPN 175/FMI 4, 14-7
SPN 27/FMI 0/1/2/14, 3-5

INDEX
Valve Function Check, 3-5

SPN 27/FMI 3, 3-3
Short to Ground Check, 3-3
SPN 27/FMI 4, 3-4
SPN 2791/FMI 3, 41-3
SPN 2791/FMI 4, 41-5
SPN 2791/FMI 5, 41-6
SPN 3510/FMI 2, 42-3
Erratic Data Check, 42-3
SPN 3510/FMI 3, 42-5
High Voltage Check, 42-5
SPN 3510/FMI 4, 42-6
Low Voltage Check, 42-6
SPN 3563/FMI 0/1/2, 43-3
Code Check, 43-3
Erratic Data Check, 43-4
Low (Boost) Pressure Check, 43-3
SPN 3563/FMI 3, 43-6
SPN 3563/FMI 4, 43-8
Open or Short to Ground Check, 43-8
SPN 3659/FMI 10
SPN 3659/FMI 5, 44-3
Check for Open Circuits, 44-3
SPN 3660/FMI 10, 45-5
SPN 3660/FMI 5


SPN 3661/FMI 10, 46-5
SPN 3661/FMI 5, 46-3
SPN 3662/FMI 10, 47-5
SPN 3662/FMI 5, 47-3
SPN 3663/FMI 10, 48-5
SPN 3663/FMI 5, 48-3
SPN 3664/FMI 10, 49-5
SPN 3664/FMI 5, 49-3
SPN 558/FMI 12
SPN 558/FMI 3, 16-3
SPN 558/FMI 4, 16-5
SPN 599/FMI 12, 17-3
SPN 601/FMI 12, 18-3
SPN 609/FMI 12, 19-3
MCM Parameter Check, 19-3
SPN 609/FMI 14, 19-4
MCM Check, 19-4

INDEX
SPN 615/FMI 3, 20-3

Multiple Codes Check, 20-3
SPN 615/FMI 4, 20-4
Open/Short to Ground Check, 20-4
SPN 625/FMI 2,9,10,13,14, 22-3
Data Link Check, 22-3
SPN 625/FMI 4, 22-5
SPN 636/FMI 1, 23-3
Low Signal Voltage Check, 23-3
SPN 636/FMI 3, 23-5
Crankshaft Position Sensor Gap Check, 23-6
SPN 636/FMI 4, 23-7
SPN 636/FMI 7, 23-9
Signal Check, 23-9
SPN 636/FMI 8, 23-10
Sensor Time Out Check, 23-11
SPN 651/FMI 10, 24-5
SPN 651/FMI 5, 24-3
SPN 652/FMI 10, 25-5
SPN 652/FMI 5, 25-3
Check for Open Circuits with the Ignition OFF, 25-3
SPN 653/FMI 10, 26-5
SPN 653/FMI 5, 26-3


SPN 654/FMI 10, 27-5
SPN 654/FMI 5, 27-3
SPN 655/FMI 10, 28-5
SPN 655/FMI 5, 28-3
SPN 656/FMI 10, 29-5
SPN 656/FMI 5, 29-3
SPN 704/FMI 3, 31-3
SPN 704/FMI 4, 31-4
SPN 704/FMI 5, 31-6
SPN 709/FMI 3, 33-3
Voltage Check, 33-3
SPN 709/FMI 4, 33-5
SPN 709/FMI 5, 33-6
SPN 723
Swapped Pins Check, 36-7
Time Out Check, 36-6
SPN 723/FMI 3
SPN 723/FMI 4

INDEX

SPN 729/FMI 3, 35-3
Short to Power/Open Check, 35-3
SPN 729/FMI 4, 35-5
SPN 84/FMI 3, 4-3
Check for Open, 4-3
SPN 84/FMI 4, 4-4
SPN 86/FMI 14, 5-3
SPN 91/FMI 2, 6-3
Check for Erratic Data, 6-3
SPN 91/FMI 3, 6-4
Check for High Voltage, 6-4
SPN 91/FMI 4, 6-6
Check for Low Voltage, 6-6
SPN 975/FMI 3, 37-3
Voltage Check, 37-3
SPN 975/FMI 5, 37-6
T
Tape and Taping, 2-40
Tape Criteria, 2-40
Taping Criteria, 2-40
Terminal Installation
Deutsch connectors, 2-26
Terminal Removal
Deutsch terminals, 2-28
Troubleshooting Add Engine Coolant Level Sensor
Test Repair, 10-9
Troubleshooting SPN 110/FMI 2, 9-4
Rationality Check, 9-4

Troubleshooting SPN 158

158 01 Battery Voltage Switched Low, 11-4
Troubleshooting SPN 3660/FMI 5, 45-3
Troubleshooting SPN 588/FMI 1
IVS Wiring Check, 16-3
Check
Verify Repairs, 18-3
Troubleshooting SPN 723, 36-3
Check
Verify Repairs, 4-3
W
Wires
recommendations, 2-25
requirements, 2-25


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DDEC VI MBE 4000 TROUBLESHOOTING GUIDE

Consider the following before servicing engines:

All information subject to change without notice. (Rev. )

Figure 1 MCM/CPC Replacement Warning

(Rev. ) All information subject to change without notice.

A LETTER TO THE TECHNICIANS

All information subject to change without notice. (Rev. )

(Rev. ) All information subject to change without notice.

All information subject to change without notice. (Rev. )

9 SPN 110 COOLANT TEMPERATURE ABOVE OR BELOW NORMAL

(Rev. ) All information subject to change without notice.

18 SPN 601 - CRUISE CONTROL SWITCHES NOT FUNCTIONING

All information subject to change without notice. (Rev. )

29.2 SPN 656/FMI 10 ....................................................................................... 29-5

(Rev. ) All information subject to change without notice.

39 SPN 1176 - TURBO COMPRESSOR INLET PRESSURE OUTSIDE

All information subject to change without notice. (Rev. )

48 SPN 3663 - ELECTRONIC UNIT PUMP #5 NOT OPERATING

(Rev. ) All information subject to change without notice.

1.1 OVERVIEW .............................................................................................. 1-3

All information subject to change without notice. (Rev. )

1.2 SCOPE AND USE OF THIS GUIDE

1.2.1 Mechanical Troubleshooting

(Rev. ) All information subject to change without notice.

1.2.2 Electronic Troubleshooting

All information subject to change without notice. (Rev. )

1.3 SAFETY PRECAUTIONS

(Rev. ) All information subject to change without notice.

All information subject to change without notice. (Rev. )

1.3.1 Ether Start

FIRE AND TOXICITY

FIRE AND TOXICITY

(Rev. ) All information subject to change without notice.

1.3.2 Exhaust (Start/Run Engine)

All information subject to change without notice. (Rev. )

(Rev. ) All information subject to change without notice.

All information subject to change without notice. (Rev. )

1.3.5 Pressurized Fluids

(Rev. ) All information subject to change without notice.

The following cautions should be followed when filling a fuel tank:

All information subject to change without notice. (Rev. )

Battery Explosion and Acid Burn

(Rev. ) All information subject to change without notice.

1.3.9 Cleaning Agent

1.3.10 Diagnostic Equipment

All information subject to change without notice. (Rev. )

1.3.11 Working on a Running Engine

(Rev. ) All information subject to change without notice.

1.3.12 Optimized Idle

UNEXPECTED ENGINE START

All information subject to change without notice. (Rev. )

(Rev. ) All information subject to change without notice.

2.1 DDEC VI SYSTEM--HOW IT WORKS ..................................................... 2-3

2.1 DDEC VI SYSTEMHOW IT WORKS

All information subject to change without notice. (Rev. )

2.2 MOTOR CONTROL MODULE

Figure 2-1 Motor Control Module

(Rev. ) All information subject to change without notice.

2.2.1 MBE4000 Engine Harness