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Small Engine
EMS Service Manual r e v 1 . 0
Rev. 1.0
1
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Preface
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Table of Contents
1. Introduction
1.1. What is EMS
1.2. Typical Components
1.3. Comparison of EMS
of EMS and Carburetor
1.4. Layout of EMS components
2. Components of EMS
2.1. Electronic Control Unit (MT05)
2.1.1. Part List
2.1.2. Description and Working Principle
2.1.3. Appearance
2.1.4. Dimension
2.1.5. Identification and Markings
2.1.6. ECU Connector Pin Configuration
2.1.7. Handling – DOs & DONTs
2.1.8. Installation Requirements
2.1.9. Power Requirements
2.1.10. Temperature Requirements
2.1.11. Maintenance, Service and Repair
2.2. Electronic Control Unit (MC21)
2.2.1. Part List
2.2.2. Description and Working Principle
2.2.3. Appearance
2.2.4. Identification and Markings
2.2.5. ECU Connector Pin Configuration
2.2.6. Handling – DOs & DONTs
2.2.7. Installation Requirements
2.2.8. Power Requirements
2.2.9. Temperature Requirements
2.2.10. Maintenance, Service and Repair
2.3. Multec 3 and Multec 3.5 Injectors
2.3.1. Part list
2.3.2. Description and Working Principle
2.3.3. Appearance
2.3.4. Seal Rings
2.3.5. Seal Rings Replacement
2.3.6. Lubricant Recommendation
2.3.7. Over Voltage
2.3.8. Temperature
2.3.9. Fuel Contamination
2.3.10. Wire Routing
2.3.11. Handling – DOs & DONTs
2.3.12. Installation guidelines
2.3.13. Adjustments
2.3.14. Interchangeability
2.3.15. Plugging
2.3.16. Cleaning Procedure
2.4. Throttle Body Assembly(with Stepper Motor)
2.4.1. Part list
2.4.2. Description and Working Principle
2.4.3. Appearance
2.4.4. Technical Parameters
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2.10.6. Fuel Quality Requirements
2.11. Ignition Coil
2.11.1. Part List
2.11.2. Description and Working principle
2.11.3. Appearance
2.11.4. Technical Parameters
2.11.5. Installation Requirements
2.11.6. Handling – DOs and DONTs
2.12. Evaporative Canister Purge Valve (ECP)
2.12.1. Part List
2.12.2. Description and Working principle
2.12.3. Appearance
2.12.4. Technical Parameters
2.12.5. Installation Requirements
2.13. Fuel Pump Module
2.13.1. Part List
2.13.2. Description and Working principle
2.13.3. Appearance & Components of Fuel Module
2.13.4. Dimensions
2.13.5. Identification and Markings
2.13.6. Operating Conditions
2.13.7. Service Parts
2.13.8. Service Procedure
2.13.9. Handling – DOs and DONTs
3. Diagnostic Tools
3.1. Motor Scanner(for MT05 EMS)
3.1.1. Precautions
3.1.2. Configurations
3.1.3. Preparations
3.1.4. Functions
3.2. Diag Tool Software(for MC21 EMS)
3.2.2. General
3.2.1. Description
Diagnostic Connector Pin Definition
3.2.3. Diag Tool Software Instruction
3.3. PCHUD Software(for MT05 EMS)
3.3.1. General Description
3.3.2. Diagnostic Connector Pin Definition
3.3.3. PCHUD Software Instruction
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Document Revision Record
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1. Introduction
In simplest terms, the purpose of fuel injection is to deliver fuel to achieve the
desired air/fuel mass ratio to the engine. Fuel atomization and injector targeting
play critical roles in achieving this ratio. The accuracy of the air/fuel mass ratio has
a direct effect on emissions, fuel economy, power and drivability, start quality and
idle quality.
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Figure 1 below shows the layout of typical EMS for a two cylinder engine. The
actual layout may slightly differ based on the application and users are advised to
contact the vehicle manufacturer for the actual layout. The solid lines in the figure
1 below indicate the output signals from the Engine Controller and the dotted lines
indicate the input signals to the controller from various sensors and switches.
Legend:
Figure 1 Dotted line indicates inputs
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2. Components of EMS
2.1. Electronic Control Unit (MT05)
The ECU continuously monitors the operating conditions of the engine through the
system sensors. It also provides the necessary computation, adaptability, and
output control in order to minimize the tailpipe emissions and fuel consumption,
while optimizing vehicle drivability for all operating conditions. The ECU also
provides diagnosis when system malfunctions occur.
2.1.3. Appearance
The MT05 ECU has a polyester header, with an aluminum base plate. Figure 2
below shows the top and bottom view of the MT05 ECU.
Figure 2
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2.1.4. Dimensions
The maximum physical envelope of the ECU is 103 x 92.6 x 27.1 mm. These
dimensions include the mounting feature on the ECU, but do not include the
assembled connector harness and pipe joint. Refer to Figure 3 below for the
Figure 3
Each ECU is identified with a product label for traceability that includes the Delphi
and Customer Part number, Customer Vehicle Platform Number, ECU Model
Description and Manufacture Date. These details should not be defaced or soiled
when the ECU is returned to the vehicle manufacturer for investigation. If these
details are not available or defaced, Delphi shall not be hold responsible for the
ECU investigation and replacement. Refer to Figure 4 below for more details.
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Figure 5B
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2.1.7. Handling – DOs & D ONTs
The ECU shall be mounted using M5 machined screws with a torque of 3.9Nm ±
10%. The mounting surface should also be flat to avoid subjecting the base plate
to unnecessary force and warping the PCB.
• Power Supply: The controller’s power supply module will power up the
microprocessor if the battery voltage is greater than 6.3 Volts. The power on is
controlled by the controller hardware only.
• Operating Range: All planned functions are executed in this range. Battery
and/or Ignition voltage: 9.0 to 16V DC
• Power Off: The controller will turn its power off when the ignition voltage: < 6.2
V DC. The controller prepares for entry into Power Down mode. The
preparation involves storing important information into EEPROM.
• Reset: During reset, all outputs shall be set to a predefined state. The
controller shall be
internal errors monitor itself The
detected. for proper operation
controller and restart
shall then enter reset should
normal any
operations
after the computer has properly reset
• Over Voltage: the controller will survive no permanent damage if the ignition
voltage do not exceed 26V for more than 1 minute
• Reverse Voltage: The controller will survive with no permanent damage: Battery
and/or Ignition voltage < -13V DC for 1 minute
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2.1.10. Temperature Requirements
ECU is a non-serviceable part. Once there are problems, it’s important to first
determine if the problem is caused by software/calibration. If it is caused by
software/calibration, please refer to software/calibration reflashing procedure. In
the event of ECU hardware failure or malfunction (during warranty period only) the
ECU should be sent back to the vehicle manufacturer giving complete details of
the ECU Part No, Serial number, Vehicle Model & Make, manufacturing Date,
Total kms run on the vehicle, Location of use, Vehicle No, Date of return.
Refer to the form 1 shown below. The form should be completely filled by the
dealer and the original form and the ECU should be sent to the vehicle
manufacturer for further investigation. These actions should be taken only during
the warranty period. Else ECU has to be replaced by the dealer at the vehicle
owner’s cost.
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Form 1
××× motor
ECU Failure Initiation Form
Dealer Name: Vehicle Make and Model Name: company
Incident Date:
Address:
Engine Size:
MFD for the Vehicle:
Kilometers Run during the Incident:
Description of the Part:
Contact No: Part No of the ECU:
Mobile phone: Serial No of the ECU:
Contact person: Manufacturer date of the ECU:
Description of the incident when the failure took place:
Actions taken by the vehicle owner and the dealer on the part and the vehicle during and after the
incident:
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MC21 is the older generation 16-bits control unit on limited small engine
applications. ECU monitors the data includes engine temperature, intake air
pressure, crank angle, oxygen in exhaust gas etc, and deliver the accurate fuel
with spark timing to achieve best fuel economy and engine performance.
2.2.3. Appearance
MC21 housing uses plastic and glass fiber with potting glue to achieve various
shock protection and waterproof. The drawing of appearance is figure 6 as below.
ECU Size
Figure 6
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2.2.4. Identification and Markings
ECU has label for traceability as figure 7 below. The information includes ECU
type, part number, customer number, hardware number, manufacture number,
software version and bar-code. If the label information is erased or soiled, it will
affect warranty.
Figure 7
The drawing below is the 34pins connector configuration. Please make sure I/O
loading is as the list specs. They are shown in figure 8 and figure 9.
Figure 8
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Figure 9
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The figure 10 as below is the mech drawing of MC21 1050, please make sure the
power and ground line are as the reference design.
Figure 10
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2.2.6. Handling – DOs & D ONTs
Do: When re-installation ECU, fix the MAP pipe Prevent performance deterioration of the vehicle.
tighten without leakage. Make sure clip, MAP pipe
and specs are provided by vehicle manufacture for
the same type.
Do: Always connect the MAP pipe from the ECU to Prevent the dust to enter the engine and safety the
the intake manifold vehicle.
Do: Release the clip in MAP nipple when take off Prevent the L-type inside ECU loosed or waterproof
MAP pipe from ECU. And careful cannot make an glue broken
effort to force the MAP pipe to be separated from
ECU.
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Figure 11
• Power on:
In normal situation, battery input should be steady state. When IGN-KEY
is on and battery voltage over 6.5V, ECU will enter normal operation.
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• Operation:
Under EMS loading, battery voltage must keep in 9~16V for system
operating normally.
• Power off:
When IGN-KEY off, ignition voltage is under 6.2V, ECU will start to
process power down. ECU memorizes learning information in EEPROM.
Such as malf-code, freeze frame, closed loop learning value, air flow
correction value and TPS learning value etc. The learning value can be
used for more accurate calculation in next key cycle.
• Reset mode:
When ECU request reset command or has serious problem, system
should enter reset mode. All I/O port should be set the predefined state
and then restart normal operations after properly reset.
• Over voltage / reverse voltage:
ECU will survive 24V over voltage for 1 minute and with no permanent
damage.
ECU will survive 14V inverse voltage for 1 minute and with no permanent
damage.
ECU is a non-serviceable part. Once there are problems, it’s important to first
determine if the problem is caused by software/calibration. If it is caused by
software/calibration, please refer to software/calibration reflashing procedure. In
the event of ECU hardware failure or malfunction (during warranty period only) the
ECU should be sent back to the vehicle manufacturer giving complete details of
the ECU Part No, Serial number, Vehicle Model & Make, manufacturing Date,
Total kms run on the vehicle, Location of use, Vehicle No, Date of return.
Refer to the form 1 was shown above. The form should be completely filled by the
dealer and the
manufacturer originalinvestigation.
for further form and the ECU
These should
actions be sent
should to the
be taken only vehicle
during
the warranty period. Else ECU has to be replaced by the dealer at the vehicle
owner’s cost.
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The Multec 3 injector was developed to provide high levels of performance and
durability to meet increasingly stringent emissions-control legislation. The Multec
3 Fuel Injector is an electromechanical device. A magnetic field is generated as
voltage is applied to the solenoid coil. The resulting magnetic force lifts the core
assembly, overcoming manifold vacuum, spring force, and fuel pressure, allowing
fuel to pass through the ball and seat interface to the director. As the fuel passes
through the director, an atomized spray is developed. The injector closes when
the voltage is removed, cutting off the fuel flow.
The working principle of the Multec 3.5 injector is more or less the same with the
Multec 3 injector. The difference is that the Multec 3.5 injector has better durability
and response than the Multec 3 injector due to its high efficiency solenoid.
2.3.3. Appearance
In ector to manifold
Figure 12
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The standard Multec 3.5 injector has a different appearance with Multec 3 injector.
The "mini" Multec 3.5 version was developed to provide fuel system packaging
advantages. They are shown in figure 13 as below.
Figure 13
Seal rings for injectors (refer to Figure 12) are made to withstand temperatures
ranging from -40℃ to 150℃ (-40 to 302℉) without leakage or seeping. They must
also be resistant to varying amounts of fuel additives to fuel (i.e., ethanol, etc.). The
following are currently available seal rings designs. Please contact a Delphi
representative if the specific sealing requirements are not met by these designs:
Injector to fuel rail seal ring
• Dimensions:
• ID. : 6.35 mm
• OD. : 14.85 mm
• Cross-section: 4.25 mm
• Materials
• Viton GLT (blue color). For low temperature applications
• Viton A (black). All other applications.
Injector to manifold
• Dimensions:
• ID: 9.61 mm
• OD: 14.49 mm
• Cross-section: 2.44 mm
• Materials:
• Viton A (black or brown other applications.)
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• Lubricate the seal rings with an approved lubricant or equivalent. The lubricant
application process must prevent lubricant from contacting the director plate,
which could possibly restrict the injector flow.
• It is preferred to not reuse the seal rings when re-installing an injector. If re-use
is necessary, carefully inspect each seal ring for any signs of damage, as even
minor defects can lead to fuel / vacuum leakage. Always install injectors and
seal rings using the recommended service procedures to avoid the possibility of
a safety hazard.
• When installing seal rings to the injector inlet, take extra care not to damage the
seal on the injector top flange.
Lubrication should be applied to the O-rings only for ease of injector installation.
The table 4 is a list of lubricant oils that were tested and approved for O-ring
lubrication. These lubricants have shown to have no effect on injector performance
(plugging, sticking).
2.3.7. Over-Voltage
The Multec 3 injectors and the Multec 3.5 injectors can withstand a voltage of 26v
for a maximum of one minute at a duty cycle of 100 ms pulse width and 200 ms
period. The injector will be pressurized with calibration test fluid at normal
operating pressure during the test. This will not result in any permanent physical
damage to the injector or coil assembly, or any degradation in electrical
performance.
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2.3.8. Temperature Requirements:
The injector fuel inlet filter protects the fuel injector from initial build fuel
contamination as well as from fuel system assembly contamination. Filtration is
extremely important because particle contaminants can cause an injector to stick
open, flow shift or tip leak.
The injector inlet filter is not a serviceable component and is designed only to trap
potential built-in contamination between the chassis fuel filter and injector.
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DO NOT: Contact or apply load to the injector tip Apply load to 45 deg angle on nylon over
for installation. mold see
DO NOT: Pound injectors into manifold during Can damage injectors or seal rings.
assembly to engine.
DO NOT: Apply excessive side loads to electrical May cause loss of electrical continuity.
connectors.
DO NOT: Use any dropped unit. Internal damage may have occurred.
DO NOT: Store injectors, rails, or subassemblies External contamination can damage the
including engines on which the injectors have injector electrically and/or mechanically.
been installed in an unprotected environment.
DO NOT: Use the injector as a handle. Do not use the injector to lift assemblies
DO NOT: Rack, stage, or handle parts in a Damage will occur.
manner that allows contact between parts.
DO NOT: Remove packing in a way that allows Damage could occur due ton contact
contact between parts. between parts.
DO NOT: Tap on fuel injectors to correct any Can damage injector.
malfunction.
DO NOT: Replace the injector with other part Will severely affect the performance of the
number not recommended for this application injector
DO: Take extra care when installing new fuel seal Prevent tearing seal ring during
ring over injector inlet flange. installation.
DO: Use proper lubricants on seal ring surfaces Avoid damage to seal ring during
to install injector in engine. Minimize time installation.
between applying lubricant and inserting injector / Avoid contamination at seal.
rail.
DO: Pulse (actuate) stuck closed or tip-leak To verify the injector failure
suspected injector (Actuate consists of one pulse
<5 sec duration at 9 to 15V).
DO: Pulse (actuate) injectors prior to a dry fuel Injector valves may not reseat without fuel
system leak test at engine/vehicle assembly to after shipping and handling resulting in
reseat injector valves. false leakage.
DO: Avoid any liquid contamination in the injector Coil could short circuit.
area.
DO: Use care during connection of harness to Avoid terminal damage.
injector.
DO: Use recommended terminal lubricant on Minimize potential for terminal fretting
mating connector. corrosion.
DO: Return any dropped, damaged, or suspect Ensure fast and correct diagnosis of root
material with a tag that describes the problem. cause.
Follow these guidelines to prevent damage to the injector and its electrical
interface during the replacement or re-installation process.
• Lubrication: Apply a light coating of lubricant to the lower injector seal ring. ISO
10 light mineral oil or equivalent is recommended.
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• The preferred technique is to apply the lubricant to the sockets the injectors are
being installed into, rather than directly to the seal ring itself. This will help
minimize the possibility of injector contamination.
• Avoid applying lubricant over the director plate holes – this may restrict injector
flow. Do not dip the injector tip in lubricant.
• All Multec 3 and Multec 3.5 injectors come from the factory with the seal rings
attached. The re-use of seal rings is not preferred when replacing an injector. If
an injector is to be re-used, and no new seal rings are available, take care to
inspect each seal ring for signs of damage. Even minor defects in the seal ring
can lead to leakage. Take extra care in installing seal ring over flange of
injector inlet.
• Carefully installing the harness connector will prevent terminal damage. Listen
for a positive audible click from the connector retention device — this ensures
that it is fully engaged.
• Avoid unnecessarily disconnecting/reconnecting the harness connector.
•
Wires routed can
components in a result
mannerin athat cancircuit
short allowand
them
a to become
stuck open pinched
injector. between
• For injectors that require orientation for spray pattern, do not rotate the injector
in the fuel rail assembly to install the injector electrical connector. This may
dislodge the retaining clip, and result in improper spray orientation
The following procedure outlines standard Multec 3 and Multec 3.5 Fuel Injectors
removal and replacement.
Warning: The injector and all associated hardware may be extremely hot.
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• Tighten the injector mounting to the desired torque as mentioned in the
manufacturer manual
• Tighten the fuel line
• Re-install the injector electrical connector
• Check for fuel leaks with the key “on” and the engine “off”
• Start engine and verify proper operation.
2.3.14. Interchangeability
The injector should be replaced in service only with an equivalent injector of the
same part number. On occasion, a new part number may supersede part
numbers. Consult the appropriate vehicle service manual and part number guide
for the latest replacement injector part number information.
2.3.15. Plugging
Fuel deposits cause plugging resulting in flow shifts over the life of the injector.
Fuel varnish or gumming, a type of injector deposit, is created when certain types
of fuel are heated by high injector tip temperatures at soak (no fuel flow). Deposit
build up in the director holes causes the flow shifts
• Plugging can cause flow restrictions, frictional changes and the collection of
other particles attracted by the tacky surface. The flow restrictions can degrade
emissions and drivability.
• Other fuel and environmental conditions may cause crystal or corrosion growth
in the injector and cause a flow shift.
• Oxidation stability of the gasoline affects the potential for deposit formation and
must be controlled by the fuel supplier.
• Increased levels of detergent additives reduce the rate of injector plugging.
• Incase of plugging of injector follow the injector cleaning procedure mentioned
in the section below
• Electrically disable the fuel pump by removing the fuel pump connection.
•
Relieve the fuel
the injector. Plugpressure in theline.
the fuel feed system and disconnect the fuel connection at
• Injector cleaner with the specific ratio of the cleaner and gasoline to be mixed in
the Injector cleaning tank.
• Connect the injector-cleaning tank to injector in the vehicle.
• Pressurize the injector-cleaning tank to system pressure.
• Start and idle the engine for 15- 20 minutes.
• Disconnect the injector-cleaning tank from the system and install the fuel pump
connections. Connect the fuel feed line to injector.
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• Start and idle the vehicle for an additional 2 minutes to ensure the residual
injector cleaner is flushed from system.
2.4.3. Appearance
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Figure 14
The appearance of the throttle body with stepper motor is shown in the figure 14
as above.
Throttle Body:
• 28mm bore size: Max flow: ≥30g/s @ 2.7kPa Vacuum;
• 34mm bore size: Max flow: ≥50g/s @ 2.7kPa Vacuum
• Throttle body opening torque:
Idle status: 0.12±0.03Nm
Full open: 0.32±0.05Nm
Throttle Position Sensor:
• Reference voltage: 5±0.1VDC
• Resistance between T1 and T2: 3k~12kΩ
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Figure 15
•
Operating voltage: 7.5~14.2
Solenoid resistance: 53Ω±10%VDC
• Solenoid inductance: 33mH±20%
•
Disconnect negative terminal of the battery
• Disconnect electric lead wire of throttle position sensor coupler, stepper motor
coupler and MAP/MAT sensor coupler ( if this sensor is mounted on the throttle
body)
• Disconnect accelerator cable from throttle body
• Remove air cleaner outlet hose and throttle body outlet hose
If there is cover on the bottom, it may be removed and cleaned using carburetor
cleaner (3M make recommended). Once the throttle body cover is removed, spray
the throttle-body cleaner inside the shipping air passage, and use the brushes to
gently dislodge the dirt, gum and varnish that are present. Do not let the bye pass
holes be blocked by dirt or foreign particles.
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• Check to ensure that all removed parts are back in place.
• Reinstall any necessary part which have not been reinstalled
2.4.9. Precautions
DO: clean the by pass passage after removing bottom cover To ensure good idle stability
DO NOT: Store units without protective caps in place. Contamination may impair correct operation.
Corrosion buildup may impact proper
DO NOT: Ship or store near saltwater without protection.
operation.
DO NOT: Exposed to environmental conditions (Moisture) Corrosion buildup may impact proper
prior to complete vehicle installation. operation.
DO NOT: Apply any voltage other than system voltage for
Damage could occur.
testing.
DO NOT: Apply excessive band clamp loading Damage could occur.
DO NOT: Remove packing in a way that allows contact Minimum air leakage could be affected and/or
between parts. other damage could occur.
DO NOT: Release the throttle cam abruptly from any position
Damage could occur.
without the throttle linkage attached.
DO NOT: Let the by pass holes be blocked by dirt or This could effect idle stability
foreign particles.
DO NOT: Rake, stage, or handle parts in a manner that
Damage will occur.
allows contact between parts.
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2.5.3. Appearance
Figure 16
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The appearance of the throttle body without stepper motor is shown in the figure
16 as above.
Figure 17
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If there is graphite coating, the graphite coating (black coating on the inside on the
throttle body bore and valve) on the throttle bore should not be removed or
cleaned on the vehicle. However the cover on the bottom may be removed and
cleaned using carburetor cleaner (3M make recommended). Once the throttle
body cover is removed, spray the throttle-body cleaner inside the shipping air
passage, and use the brushes to gently dislodge the dirt, gum and varnish that are
present. Do not let the bye pass holes be blocked by dirt or foreign particles.
If idle screw assembly is also removed for cleaning, then follow the below
procedure for Idle screw assembly:
• Assemble the O-ring1 to Idle By-pass screw
• Assemble the spring, washer & O-ring 2 to Idle By-pass screw
• Assemble the above Idle By-pass screw sub-assy. to Throttle Body
After cleaning and idle screw assembly, use the diagnostic tool to set the idle rpm.
2.5.9. Precautions
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DO: Unload and install units one at a time from packing trays. Damage may be done to critical components.
DO: Return any dropped, damaged, or suspect material with Ensure fast and correct diagnosis of root
a tag that describes the problem. (Only warranty cases) cause.
DO: Remove and discard protective caps just before Protects system from contamination, which
assembling mating components. can prevent proper operation.
DO: clean the bye pass passage after removing bottom cover To ensure good idle stability
To ensure there is no air leakage from the
DO: replace ‘o’ rings on the idle screw if it is dismantled
worn or damaged ‘o’ rings
Internal damage may have occurred or
DO NOT: Use any dropped or impacted unit.
emissions settings may have been upset.
DO NOT: Store units without protective caps in place. Contamination may impair correct operation.
Corrosion buildup may impact proper
DO NOT: Ship or store near saltwater without protection.
operation.
DO NOT: Exposed to environmental conditions (Moisture) Corrosion buildup may impact proper
prior to complete vehicle installation. operation.
DO NOT: Apply any voltage other than system voltage for
Damage could occur.
testing.
DO NOT: Apply excessive band clamp loading Damage could occur.
DO NOT: Remove packing in a way that allows contact Minimum air leakage could be affected and/or
between parts. other damage could occur.
DO NOT: Release the throttle cam abruptly from any position
Damage could occur.
without the throttle linkage attached.
DO NOT: Let the bye pass holes be blocked by dirt or
This could effect idle stability
foreign particles.
DO NOT: Rake, stage, or handle parts in a manner that
Damage will occur.
allows contact between parts.
This sensor is used in water cooled engines. It provides a resistance that varies as
a function of temperature within prescribed tolerance limits. The sensor has a
negative temperature coefficient of resistance. This is a non-serviceable part.
2.6.3. Appearance
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Figure 18
The appearance of the Engine Coolant Temperature Sensor is shown in the figure
18 as above.
• Dynamic Torque Requirement: The sensor shall be hand into the application
and then driven by a driver with a maximum no load speed of 400 rpm or
installed to the desired torque by a hand torque wrench (5/8” hex). The
recommended installation torque is:
• Minimum: 20 N·m
• Maximum: 25 N·m
• Static Torque Requirement: The torque required to remove the sensor from the
mating hole shall be within 200% of the installation torque mentioned above.
• This device is intended for use in engine coolant and air cooled applications
and shall withstand such an under hood environment.
• Normal Operating Temperature: -40°C ~ 135°C (continuously).
• Relative Humidity: 0 to 100% RH.
• Typical Pressure: When installed at the minimum torque the sensor shall be
capable of sealing engine coolant with a positive pressure of 206.8 kPa (30 psi)
at 135°C applied to the probe tip end of the sensor.
• Extreme Operating Environment: Maximum temperature excursion to 150°C for
1 hour.
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2.6.7. Electrical Environment
• When necessary the samples may be cleaned in isopropyl alcohol for one
minute with mating connectors in place and then air-dried
This sensor is used in air cooled engines. It provides a resistance that varies as a
function of temperature
negative temperature within prescribed
coefficient tolerance
of resistance. This is alimits. The sensor
non-serviceable part.has a
2.7.3. Appearance
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Figure 19
• Recommend to put the washer and spring gasket between bolt and sensor
before assembly.
• Mounting Torque Requirement: 4~6Nm.
• When necessary the samples may be cleaned in isopropyl alcohol for one
minute with mating connectors in place and then air-dried
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2.8.3. Appearance
Sensor end
Connector End
Figure 20
•
Operating Temperature:
Relative Humidity: -40 ~RH.
0 to 100% 150°C
• When necessary the samples may be cleaned in isopropyl alcohol for one
minute with mating connectors in place and then air-dried
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0.1 VDC.
2.9.7. Sample Cleaning
This sensor is a device for monitoring the residual oxygen in the exhaust of an
internal combustion engine. It consists of the wide range sensor and stoichiometric
sensor. Usually we use stoichiometric sensor on the small engine. It is the
feedback element for engine closed loop control.
2.10.3. Appearance
The appearance of the Engine Oxygen Sensor is shown in the figure 22 as below.
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Figure 22
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Figure 23
•
Tightening Torque Requirement: 40-60 Nm
2.10.6. Fuel Quality Requirements
• Pb≤0.005g/L
• P≤0.0002g/L
• S≤0.04% (weight proportion)x
• MMT≤0.0085g/L
• Si≤4ppm
This coil provides energy to the spark plug in the combustion chamber. The coil
itself doesn’t have a driver. The high voltage tower of the coil is connected to the
spark plug using a high voltage cable assembly. This is a non-serviceable
component.
2.11.3. Appearance
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The appearance of the Ignition coil is shown in the figure 24 as below.
Figure 24
• The vehicle frame provides the mounting surface and mounting holes.
• Mount coil close to the spark plug and keep the plug wire length very short (less
than 6 “).
• Mount coil away from any pick coil device. Especially, a VR type Crank / Cam
sensor. Keep a Min distance of 150 mm (around 6”) between coil and any VR
sensor device.
• Never route the coil C- wire with the same bundle as the Crank sensor wires.
There is around 200 V peak potential between C- wire and engine ground. This
voltage potential could cause a noise on sensor cables.
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2.11.6. DOs and DONTs
DO: Use approved connector breakouts when Connector and/or component damage may occur.
testing the ignition system.
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DO: Insure the appropriate seals are included in Liquid intrusion into the terminal connection area
the connector system. might occur causing an electrical intermittent or short
condition. In the event of severe terminal corrosion, an
open condition might occur.
DO: Operate with gasoline based internal Other fuels or combustion designs may require
combustion engines. additional design considerations.
DO: The power feed line should be fused. This could protect the system in the event of an
electrical short
DO: The module heat sink and back plate must not The high level of voltage and current which the
be used as a connection point when jump starting module could be subjected to, could cause module
the engine performance degradation or failure.
DO: Connection of the module back plate to vehicle This greatly reduce potential ground loops and acts as
ground is desirable whenever possible a heat transfer source from the module.
DO: The ignition system ground wire should be This would greatly reduce the possible of unwanted
kept as short as possible. And, when permissible, electrical ground loops.
should be grounded at the same engine block
position as the engine controller
DO: The electrical wiring to the ignition system Helps prevent electrical intermittent, open or shorted
should be routed so that the conductors are operating conditions.
protected from excessive heat, damage, and wear.
DO: Ignition secondary leads should not be routed Voltage spikes can be transmitted from the secondary
with the ignition primary harness or any other cables into other leads which are in close. This could
electrical harness. create a component performance degradation or
failure condition
DO: Spark plug wires(secondary leads) & primary - Spark plug wires carry very high voltage (30,000
wiring: volt). If the secondary lead loses its dielectric
- must not contact sharp surface characteristics thru being nicked, cut , chaffed, then
- must not be under tension between fixed points an arc thru to a near by ground could take place. This
- must be clear of moving parts (belts, fan, etc…) kind of condition could lead to misfire, no start, or
- must be protected from or kept at least 125 mm premature failure of ignition system.
away from radiant heat source exceeding 400 F.
- must be protected from environmental damage
(dirt, splash, oils, fluids, etc….)
- must be retained, secured or insulated to prevent
pinching, mis-routing, rattles, and squeaks
DO: Not all fasteners are designed for repeat use. Adequate retention force might not be achieved if
Beware of fastener specifications. All harnesses the fastener is not designed to be reused. Mating
should be supported within 6" of a mating connections are not designed to support the weight of
connection. the harness assembly.
DO: For removing spark plugs follow the following To remove spark plugs from Aluminum heads, allow
steps: the engine to cool. The heat of the engine, in
1- Grasp the spark plug boot and gently rotate combination with a spark plug that is still hot, may
90°; and then pull the spark plug boot and cause the spark plug threads to strip the cylinder head
cable away from the spark plug upon removal
2- Before removing spark plug, brush or air blast Use goggles to protect eyes from dirt when applying
dirt away from the well areas compressed air to spark plug wells
3- Use correct size deep socket wrench to loosen
each spark plug one or two turns
DO: Cleaning a spark plug could be done as follow: - Cleaning a spark plug will reduce the voltage
1- wipe all spark plug surfaces clean….remove required for an electrical arc(spark) across the
oil, water, dirt and moist residues. electrodes
2- If the firing end of spark plug has oily or wet - Cleaning & re-gapping will not restore a used
deposit, brush the spark plug in an approved, spark plug to a new condition. It may be more
non-flammable and non-toxic solvent. Then economical and efficient to replace used spark
dry the spark plug thoroughly with compressed plugs with new plugs instead of cleaning.
air - Sooted plugs should be replaced
3- Use a propane torch to dry wet-fuel fouled - Do not cool by using water or any liquid
plugs. - Clean threads permit easier installation and
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Allow the torch flame to enter up the center proper seating which will maximize transfer heat away
electrode insulator. Allow plug to cool down from the plug
4- If the spark plug threads have carbon & scale
deposits, clean with wire brush, taking care not
to injure the electrode or the insulator tip
DO: Regap spark plugs to the exact measurement - Too wide a gap could cause the plug to
specified by the engine manufacturer to keep the misfire(higher required
best fuel economy and proper engine performance ignition voltage).
- Use round wire-type gauge for an accurate - Too narrow of a gap could affect idle stability
measure of gap on all used spark plugs - A flat gauge can’t accurately measure the spark
- when gapping a spark plug only the side electrode plug on used plugs
is moved. The center electrode must not be moved
DO: When replacing spark plugs with new ones, - Higher heat range plug(hotter plug) could lead to
always use equivalent plugs with same heat range, pre-ignition & possible piston damage
thread, size, etc…. - Lower heat range (colder plug) could lead to cold
fouling & emission problem
DO: For installing spark plugs follow the following - If the thread is damage, it prevents a good heat
steps: transform from the shell to the cylinder head
1- make sure the cylinder head threads and spark - Do not use any type of anti-seize compound on
plug threads are clean. Make sure the spark spark plug threads. Doing this will decrease the
plug thread is free of dings and burrs. If amount of friction between the threads. The result
necessary, use a thread chaser and seat of the lowered friction is that when the spark plug
cleaning tool. is torqued to the proper specification, the spark
2- Make sure the spark plug gasket seat is clean, plug is turned too far into the cylinder head. This
then thread the gasket to fit flush against the increases the likelihood of pulling or stripping the
gasket seat. Tapered seat plugs do not require threads in the cylinder head
gaskets - Over-tightening of a spark plug can cause
3- Screw the spark plugs finger-tight into the stretching of the spark plug shell and could allow
cylinder head. Then, use a torque wrench to blowby to pass thru the gasket seal between the
tighten spark plugs following manufacturer’s shell and insulator. Over-tightening also results in
recommendation). extremely difficult removal
Torque is different for various plug type & cylinder
head material
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ECP
Part Part
Name List Remarks Table: 19
Evaporative Canister Purge
The evaporative canister purge system controls the release of fuel vapors from the
vapor collection canister into the engine intake manifold, so that they are burned in
the combustion process. We can reduce the evaporative emission through this
system.
2.12.3. Appearance
Figure 25
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• Flow curve as below figure 26:
Figure 26
Fuel Pump Module supplies fuel to engine at system pressure. Fuel Pump Module is
mounted to fuel tank at bottom and supplies fuel to engine through hoses.
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Fuel Pump module consists of Fuel Pump to generate the fuel flow and pressure
regulator to regulate the fuel pressure.
Fuel Pump
When power is supplied to fuel pump, motor in pump assembly rotates the impeller.
Impeller in turn draws the fuel from strainer and pumps the flow to generate the system
pressure.
Pressure Regulator
Pressure Regulator is a diaphragm type mechanical device. Fuel flow from filter enters in
the inlet of pressure regulator. Pressure regulator regulates the fuel pressure at a set
pressure by releasing the excessive fuel flow to fuel tank.
9
8 11
1. Fuel Pump
1 2. Strainer
2 3. Gasket, Fuel Module
4. Clamp, Fuel Tube
7 5. Module Bracket
6. Fuel Module Harness
7. Pump Harness
8. Pressure Regulator
6 9. Regulator Retainer
3
10. Fuel Tube
4 11. Retainer & Isolator, Fuel Pump
5 Figure 27
2.13.4. Dimensions
Fuel Module Cover in elliptical shape with outer edge dimensions as 115mm x 70mm.
Fuel Module Height from Cover to the Fuel Tube top portion is 135mm (reference value).
Fuel Module, Fuel Pump and Regulator are marked with batch code in Julian Date Code.
On Fuel Module, batch code in mentioned on the label available on fuel module cover.
On Fuel Pump Batch code is engraved on pump body (shell).
On Fuel Pressure Regulator, batch code is engraved on regulator dome area.
• Fuel Pump Module needs to be mounted on Fuel Tank Bottom according to the
installation instructions.
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• Fuel Pump Module is intended to use with gasoline. However if the fuel contains
ethanol, please contact vehicle manufacture to check whether the fuel pump module
itself can survive or not.
• Make sure there is at least 3 liters of gasoline in the fuel tank before priming for first
time (do not run the pump dry)
• Fuel Hose connections needs to be installed according to the fuel flow diagram shown
in Figure 28
Figure 28
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2.13.7. Service Parts:
2. (Fuel
Clamp,Pump
Fuel +Tube
Strainer + Fuel Tube)
3. Gasket, Fuel Module
4.
Figure 29 Figure 30
Figure 31 Figure 32
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2.13.8. Service Procedure:
Precautions:
Before attempting any service on fuel system, following cautions should be always
followed for personal safety and to avoid system damages.
• Disconnect negative cable at battery.
• DO NOT smoke, and place ‘No SMOKING” sign near work area
• Make sure to have fire extinguisher handy.
• Make sure to perform work in well ventilated area and away from any open fire/flames.
• Wear Safety glasses
• To relieve fuel vapor pressure in fuel tank, remove fuel filler cap fuel filler neck and
then reinstall it.
• As fuel lines are at high pressures when the engine is stopped, loosening or
disconnecting fuel line will cause dangerous spout of fuel. Before loosening/
disconnecting fuel lines, please follow the “Fuel Pressure Relief Procedure” described
in this section.
• Small amount of fuel may drip after the fuel lines are disconnected. In order to reduce
the risk of personal injury, cover the pipe/ hose ends with suitable blind with no rust or
contamination.
• After servicing, make sure that the fuel hoses and clamps are connected according to
the hose fitment instructions given in vehicle instruction manual.
• After servicing, please follow the ‘Fuel Leakage Check Procedure’ described in this
section.
• After servicing make sure to fill at least 3 liters gasoline before pump is primed
(ignition key should be turned on only after ensuring there is minimum 3 liters of fuel in
the fuel tank)
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Check fuel system pressure at Injector
inlet (with a T-joint) while engine is
running in idle condition. Fuel Module Operation
4 Go to Step 5
Normal
Is the pressure between 220 ~
• Relieve fuel pressure in fuel lines referring to the ‘Fuel Pressure Relief Procedure’
provided in this section.
• Disconnect negative cable at battery.
• Disconnect fuel module wire coupler.
• Drain the fuel in fuel tank thru fuel filler with help of hand pump (siphon). Collect the
fuel in approved container for contamination and safety.
• Disconnect the fuel hoses from fuel module by using standard tools
• Remove the fuel tank from vehicle.
• Place the fuel tank with bottom up condition. Care to be taken not to cause any
scratches/ damages on fuel tank.
• Open the fuel module mounting bolts.
• Take out fuel module assembly from fuel tank with care
• Care to be taken not to damage the strainer while removing fuel module from tank.
• Replace the fuel module gasket in fuel module assembly with a new one. Old/ used
gaskets can cause leakages.
• Fold strainer towards fuel pump and insert fuel module in tank opening with care. Care
should be taken not to cause any damages on strainer.
Fuel Module Orientation: Fuel module bolts not symmetrical and can be mounted
only in the intended direction. Regulator side should be facing the Fuel Tank rear
side.
Make sure that the fuel tank surface at module mounting area is clean and free of
surface defects.
• Place the bolts on module cover and tighten the bolts gradually in star pattern
sequence to apply equal compression on gasket. It is shown in figure 33 as below.
Bolt Tightening Torque: 3~4 Nm.
Fuel module is installed with special bolts (step bolts). Use designated bolts only.
Follow the tightening torque and tightening sequence instruction. Over torque and
miss-sequence can cause unequal compression of gasket and leakage.
• Install the fuel tank to vehicle.
• Connect for fuel hoses with suitable hose clamps.
• Connect fuel module coupler.
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• Follow “Fuel Leakage Check Procedure’ to check any leakage before the engine is
started.
1
3 6
4
5
2
Mounting Bolts – Star Tightening Pattern Figure 33
Caution: This work must not be done when engine is hot. If done so, it may cause
adverse effect to catalyst (if equipped)
After making sure that engine is cold, relieve fuel pressure as follows.
• Place vehicle gear in ‘Neutral’.
• Disconnect fuel module electrical coupler from vehicle harness.
• Start engine and run till it stops due to lack of fuel. Repeat ignition key ON and OFF
for 2 ~ 3 times of about 3 seconds each time to relieve fuel pressure in lines. Fuel
Connections are now safe for servicing.
• Upon the completion of servicing, Connect Fuel Module Connector to Vehicle Harness.
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After performing any service on fuel system, check to make sure that there are no fuel
leakages as below.
• Fill about 3 ~ 5 liters of fuel in tank.
• Turn Ignition key to ON position for 3 seconds (to operate fuel pump) and then turn to
OFF position. Repeat this for 3 ~ 4 times to apply fuel pressure in fuel lines.
• In this state, check to see that there are no fuel leakage from any part of fuel system
(Fuel Tank, Hoses, Hose Joints, etc)
DO NOT: Use damaged/ distorted hose clamps. Can cause fuel seepage/ leakage.
DO NOT: Use Fuel Module if the strainer with Contamination enters fuel pump thru damaged
excessive damage/ cut. strainer damages the Fuel Pump
DO NOT: Use Fuel Pump for draining duel in fuel Not intended function of fuel module.
tank.
DO NOT: Use module mounting bolts for mounting Affects fuel module sealing.
other components.
DO NOT: Damage fuel pump harness while Damaged terminals will cause intermittent/ No
servicing fuel module. contact for power supply.
DO NOT: Force hand pump towards fuel module To avoid any damages on fuel module.
while draining fuel from tank.
DO : Ensure that there are no damages to fuel Can cause fuel seepage/ leakage.
pipes while servicing fuel module
DO: Use genuine module gasket only. Spurious gaskets can cause leakages.
DO: Use designated hose clamps. To ensure no leakages/ seepages thru hose
joint.
DO: Clamp fuel module harness to vehicle chassis Clamp provides mechanical support for wiring
harness in vibrations.
DO: Use only standard gasoline for operating Fuel Module is intended to run in standard
vehicle/ module. gasoline. Adulterated fuel can cause fuel
module premature failures which are not
covered under warranty.
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DO: Change the fuel filter at recommended Clogged fuel filter will cause restriction in fuel
intervals. flow and can cause flow reduction.
DO: Use fuel filters supplied/ recommended fuel Spurious fuel filters causes damages to
filters only. injector, regulator and fuel pump performance.
DO: Ensure that the hoses are routed properly Improper routing, kinks and fouling of hoses
and there are no kinks / rubbing with other with other components causes hose damage
components.
DO : Ensure that always sufficient fuel till the Avoids Pump running in dry
strainer height
DO: Replace two O-rings along with replacement/ For proper functioning of regulator.
re-installation of pressure regulator.
DO: Use care during connection of harness to Avoid terminal damage.
module coupler.
DO: Return any dropped, damaged, or suspect Ensure fast and correct diagnosis of root
material with a tag that describes the problem. cause.
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3. Diagnostic Tools
3.1. Motor Scanner(for MT05 EMS)
3.1.1. Precautions
• Motor-Scanner is a precision instrument and should be protected from vibration
and impact.
• If the unit does not run correctly or the screen is unstable when first turned on,
disconnect it from the main lead and try again.
• Make sure the DLC is always firmly inserted into the diagnostic socket.
• Never test electrical signals that exceed the limit of specifications.
• Test cannot be performed by the person who is driving the car.
• This unit should be used and stored in the following conditions:
℃
Ambient temperature:
Relative humidity: 0~50
<90%
3.1.2.Configurations
Delphi Motor scanner consists of 2 main part: the main units (with diagnostic main
cable) and diagnostic connector link (one end is 6PIN connector; the other is the
interface for connecting diagnostic main cable). They are shown in figure 34 as
below.
Figure 34
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Figure 35
The 6PIN diagnostic connector link cable and USB type main unit’s software
update cable are in the delivered package.
Screen:
128 × 64 array high definition screen with back light for displaying all the
information during testing.
Keyboard:
There are 5 keys (one is reserved) on the main unit for selecting and controlling
test steps.
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3.1.3. Preparations
Connection
3.1.4. Functions
Operations
When the unit is powered up, the screen will display the interface as below.
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Select ‘English’ and press key, it will display information about the diagnostic
Diagnostic Function
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Press , with ‘accessing system’ fleeting on the screen, then, it will display as
below:
1. Read DTC
Select ‘Read DTC’, and press , it will display fault code as below:
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Press or key to move ‘.’ icon, and select fault code, take ‘P0118’ for
example, it’s selected when there is ‘.’ in front of it, press , the screen will
display detailed information of the code, as below:
2. Clear DTC
3. Data Stream
Select ‘Data Stream’ and press , it will display as below:
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Press or key for page up/down to view more. Press key to exit.
4. Status Stream
Select ‘Status Stream’ and press , the interface will display as below:
Press or key for page up/down to view more. Press key to exit.
5. Record Data
Select ‘Record Data’ and press , it will display:
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Press or key to enter code, when the first number of the code was set,
press to confirm and continue to input the sequent numbers, till all the 7
numbers were input.
When all the 7 numbers were set, press , the screen will display a message
for confirmation of the Plate Number input. Press to return to the previous
interface to input the code again or press to confirm the code.
Press , another interface will be displayed for you to input date, as below:
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Till now, the ‘date input’ was completed, and it starts to record data, press to stop
recording.
DIAG TOOL is software for monitoring the engine status and recording the engine
running parameters. It communicates to the ECU via K-Line of the diagnostic
connector.
The diagnostic connector has 6 pins as shown in figure 36 as below. These pins
can be used to perform various diagnostic or service functions. This Diagnostic
Tool uses only 3 pins of them, which are +12V battery, Ground and K-line.
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Pin2: Ground
Pin4: K-line
Figure 36
Initial setting:
• Use DIAG TOOL cable to connect the computer COM port and the ECM
diagnostic connector
• Start DIAG TOOL
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• Click on “Engine Data” to display and monitor the engine parameters.
• Log data
Set the sample rate to typically 0.1second and specify the data log file and folder .
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• ECU version
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• Click on “Malf Code” to display the current malf codes
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P0132 O2 Short V 氧 传
44
感 器 短 接 到 电 源
Open/GND
P0262 Cylinder 1Inj Short V 一 缸
17
喷 嘴 短 接 到 电 源
Gnd
P0351 Cylinder 1 Ign Short V 一 缸 42
点 火 线 圈 短 接 到 电 源
Crank Sensor 19
P0335 Malfunction 曲 轴 位 置 传 感 器 故 障
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PCHUD is software for monitoring the engine status and recording the engine
running parameters. It communicates to the ECU via K-Line of the diagnostic
connector.
The diagnostic connector has 6 pins as shown in figure 37 as below. These pins
can be used to perform various diagnostic or service functions. This Diagnostic
Tool uses 3 pins, which are +12V battery, Ground and K-line.
Pin2: Ground
Pin4: K-line
Figure 37
Initial setting:
• Use PCHUD cable to connect the computer COM port and the ECM diagnostic
connector
• Start PCHUD
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• Check malf code meaning by reading the below table.
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