MD Code-Bk
MD Code-Bk
MD Code-Bk
E S
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4 TRUCKS
5 5
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1st Printing
This Medium Duty Truck Diagnostic Code Manual has been produced in order to help the diagnostic technician
retrieve diagnostic trouble codes from tiltcab trucks such as the Isuzu NPR, Chevrolet Forward, GMC
Tiltmaster, Mitsubishi Fuso, Nissan UD and various Hino models. This manual also contains the code retrieval
manual process for the Ford and International LCF Series trucks equipped with the 5R110W transmission.
These trucks can be equipped with various transmissions such as the JR403E Electromatic, the Aisin Seiki 450-
43LE or the Aisin 6 speed transmission. There is also a reference to the Mitsubishi Fuso manufactured Sterling
trucks.
Since most shops do not have a dedicated scan tool to retrieve codes, this manual contains the manual code
retrieval process for the above mentioned vehicles as well as code definitions. It also contains the relearn
procedures that are necessary for proper transmission operation.
No part of any ATSG publication may be reproduced, stored in any retrieval system or transmitted in any form or
by any means, including but not limited to electronic, mechanical, photocopying, recording or otherwise,
without written permission of Automatic Transmission Service Group. This includes all text illustrations,
tables and charts.
ECONO LAMP
35 45 55
ECONO
25 65
15 75
5 85
MPH
Figure 1
If no codes are stored, the Econo Indicator Lamp will come ON for 2 seconds and then go OUT.
If when the code retrieval procedure is done but there are no codes stored, the Econo Indicator Lamp will
flash continuously.
The code retrieval procedure for 1988-90 models is shown in Figure 2.
1988-90 CODE RETRIEVAL PROCEDURE
1. Ignition "OFF" 6. Economy switch in ECONOMY position
2. Shift lever in "D" range 7. Shift lever in "1" range
3. Economy switch in "NORMAL" position 8. Economy switch in "NORMAL" position
4. Ignition switch "ON" 9. Depress accelerator pedal to the floor and
5. Shift lever in "2" range release
Figure 2
The ECONO Indicator Lamp will flash a judgement flash that will have remained on LONGER than the
other flashes as indicated in Figure 3, the LONGER flash is the judgement code. The code pattern display
is shown in Figure 4.
Figure 3
The code patterns listed in Figure 3 are for the 1988-90 trucks which indicate the judgement flash codes the
ATCU is capable of storing. If the ECONO Indicator Lamp does NOT respond, check operation of the
Inhibitor Switch, Economy Switch & Bulb, Kickdown Switch or the Idle Switch.
Use the code chart in Figure 4 for the 1988-90 models
1988-90 CODE CHART
JUDGEMENT COMPONENT
CODE AFFECTED PROBABLE CAUSE
1 SPEED SENSOR #1 SPEED SENSOR ON TRANSMISSION FAULT
2 SPEED SENSOR #2 SPEED SENSOR IN SPEEDOMETER FAULT
3 THROTTLE SENSOR OUT OF RANGE
4 SHIFT SOLENOID "A" OPEN OR SHORTED
5 SHIFT SOLENOID "B" OPEN OR SHORTED
6 OVERRUN CLUTCH SOLENOID OPEN OR SHORTED
7 LOCK-UP SOLENOID OPEN OR SHORTED
8 ATF THERMOSENSOR ATF TEMP SENSOR FAULT
9 ENGINE RPM SENSOR OPEN CIRCUIT
10 LINE PRESSURE SOLENOID OPEN OR SHORTED
Figure 4
Automatic Transmission Service Group
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3
ISUZU NPR/GMC FORWARD TILTMASTER
& CHEVY FORWARD
1988-90 CODE CLEARING PROCEDURE
Codes can be cleared by removing the #11 fuse from the glove box fuse box for 10 seconds as seen in
Figure 5 or by disconnecting the battery cables. The Econo Lamp will flash rapidly to indicate that the
memory has been cleared.
FUSE #11
Figure 5
Once repairs have been completed, Code 21 for a Throttle Position Sensor (TPS) may refuse to be cleared.
Stacked shifts may also be experienced.
A TPS relearn is required to clear Code 21 as well as to allow correct shift timing.
The TPS relearn procedure is as follows:
1. Turn ignition ON, do not start engine.
2. Depress accelerator pedal to the floor until a “CLICK” is heard, then release the throttle pedal. Upon
release of the throttle pedal a “CLICK” should be heard again.
3. Without turning the ignition OFF, start the engine.
4. Quickly depress accelerator the floor and release it.
CAUTION: It is an absolute necessity to insure that the TPS ranges correctly, the throttle cable is not
stretched and that the hand throttle, if so equipped, is at an idle position and the hand throttle
cable is not frozen or the TPS relearn will not be successful.
DIAGNOSTIC
CONNECTOR
(2 WIRE)
Figure 6
The code pattern also changed which resembles the typical GM code format. The first digit are LONG
flashes, and the second digit are SHORT flashes as seen in the illustration in Figure 7.
If no codes are stored, the Econo Indicator Lamp will come on for two seconds when the ignition is turned
ON, and then go out as seen in Figure 8.
Figure 7
Automatic Transmission Service Group
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5
ISUZU NPR/GMC FORWARD TILTMASTER
& CHEVY FORWARD
1991 CODE RETRIEVAL PROCEDURE
ECONO LAMP
35 45 55
ECONO
25 65
15 75
5 85
MPH
Figure 8
If no codes are stored after the code retrieval procedure is performed, a code "1" will be flashed repeatedly.
If one code is stored, the code will be repeated three times.
When two or more codes are stored, each code will be repeated three times with each code displayed in
numerical order.
FUSE #11
Figure 10
Once repairs have been completed, Code 21 for a Throttle Position Sensor (TPS) may refuse to be cleared.
Stacked shifts may also be experienced.
A TPS relearn is required to clear Code 21 as well as to allow correct shift timing.
The TPS relearn procedure is as follows:
1. Turn ignition ON, do not start engine.
2. Depress accelerator pedal to the floor until a “CLICK” is heard, then release the throttle pedal. Upon
release of the throttle pedal a “CLICK” should be heard again.
3. Without turning the ignition OFF, start the engine.
4. Quickly depress accelerator the floor and release it.
CAUTION: It is an absolute necessity to insure that the TPS ranges correctly, the throttle cable is not
stretched and that the hand throttle, if so equipped, is at an idle position and the hand throttle
cable is not frozen or the TPS relearn will not be successful.
35 45 55
ECONO
25 65
15 75
5 85
MPH
Figure 11
DIAGNOSTIC
CONNECTOR
(2 WIRE)
BRAKE
MASTER
CYLINDER
Figure 12
Automatic Transmission Service Group
Techn ical Se rvice Inf ormation
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ISUZU NPR/GMC FORWARD TILTMASTER
& CHEVY FORWARD
1992-94 CODE RETRIEVAL PROCEDURE
Inhibitor Switch code capability was added for the 1993 model year as shown in the code chart in Figure
13.
1992-94 CODE CHART
CODE COMPONENT
NUMBER AFFECTED PROBABLE CAUSE
11 SPEED SENSOR #1 SPEED SENSOR ON TRANSMISSION FAULT
13 ENGINE RPM SENSOR OPEN OR SHORTED
15 ATF THERMOSENSOR OPEN OR SHORTED
*17 INHIBITOR SWITCH OPEN OR SHORTED
24 SPEED SENSOR #2 SPEED SENSOR IN SPEEDOMETER FAULT
21 THROTTLE SENSOR OPEN OR SHORTED
31 SHIFT SOLENOID "A" OPEN OR SHORTED
32 SHIFT SOLENOID "B" OPEN OR SHORTED
33 OVERRUN CLUTCH SOLENOID OPEN OR SHORTED
34 LOCK-UP SOLENOID OPEN OR SHORTED
35 LINE PRESSURE SOLENOID OPEN OR SHORTED
*THIS CODE WAS ADDED FOR THE 1993 MODEL YEAR
Figure 13
Codes can be cleared by removing the #11 fuse from the glove box fuse box for 10 seconds as seen in
Figure 5 or by disconnecting the battery cables. The Econo Lamp will flash rapidly to indicate that the
memory has been cleared. On Budget rental trucks, remove Circuit Breaker #8.
FUSE #11
Figure 14
Once repairs have been completed, Code 21 for a Throttle Position Sensor (TPS) may refuse to be cleared.
Stacked shifts may also be experienced.
A TPS relearn is required to clear Code 21 as well as to allow correct shift timing.
The TPS relearn procedure is as follows:
1. Turn ignition ON, do not start engine.
2. Depress accelerator pedal to the floor until a “CLICK” is heard, then release the throttle pedal. Upon
release of the throttle pedal a “CLICK” should be heard again.
3. Without turning the ignition OFF, start the engine.
4. Quickly depress accelerator the floor and release it.
CAUTION: It is an absolute necessity to insure that the TPS ranges correctly, the throttle cable is not
stretched and that the hand throttle, if so equipped, is at an idle position and the hand throttle
cable is not frozen or the TPS relearn will not be successful.
CHECK
TRANS CHECK
BRAKE VACUUM ON
OFF
TRANS
40 50 60 LAMP
30 60 80 100 70
120 80 C H
20 40 143045 E F
140 90
20
10 0 03045 160 DIESEL FUEL ONLY
0 MPH 100 P R N D 2 1
65
0 216
Figure 15
DIAGNOSTIC
CONNECTOR
(3 WIRE) BRAKE
MASTER
CYLINDER
JUMP OUTER
U
2 WIRES
Figure 16
Automatic Transmission Service Group
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ISUZU NPR/GMC FORWARD TILTMASTER
& CHEVY FORWARD
1995 & 1995½-98 CODE RETRIEVAL PROCEDURE
Use the code chart in Figure 17 for the 1995 & the 1995½-98 models.
1995 & 1995½-98 CODE CHART
CODE COMPONENT
NUMBER AFFECTED PROBABLE CAUSE
11 SPEED SENSOR #1 Fault (On Extension Housing, Pulse Generator.)
13 ENGINE RPM SENSOR Open or Shorted
15 ATF THERMOSENSOR Open or Shorted
17 INHIBITOR SWITCH Open or Shorted
21 THROTTLE SENSOR Open or Shorted
*24 SPEED SENSOR #2 Fault (On Extension Housing, Gear Driven)
31 SHIFT SOLENOID "A" Open or Shorted
32 SHIFT SOLENOID "B" Open or Shorted
33 OVERRUN CLUTCH SOLENOID Open or Shorted
34 LOCK-UP SOLENOID Open or Shorted
35 LINE PRESSURE SOLENOID Open or Shorted
*The 1994 models will have the #2 Speed Sensor in the speedometer head.
Figure 17
FUSE #11
Figure 18
Automatic Transmission Service Group
Techn ical Se rvice Inf ormation
12
ISUZU NPR/GMC FORWARD TILTMASTER
& CHEVY FORWARD
1995 & 1995½ - 1998 TPS RELEARN PROCEDURE
Once repairs have been completed, Code 21 for a Throttle Position Sensor (TPS) may refuse to be cleared.
Stacked shifts may also be experienced.
A TPS relearn is required to clear Code 21 as well as to allow correct shift timing.
The TPS relearn procedure is as follows:
1. Turn ignition ON, do not start engine.
2. Depress accelerator pedal to the floor until a “CLICK” is heard, then release the throttle pedal. Upon
release of the throttle pedal a “CLICK” should be heard again.
3. Without turning the ignition OFF, start the engine.
4. Quickly depress accelerator the floor and release it.
CAUTION: It is an absolute necessity to insure that the TPS ranges correctly, the throttle cable is not
stretched and that the hand throttle, if so equipped, is at an idle position and the hand throttle
cable is not frozen or the TPS relearn will not be successful.
CHECK
TRANS CHECK
BRAKE VACUUM ON
OFF
TRANS
40 50 60 LAMP
30 60 80 100 70
120 80 C H
20 40 143045 E F
140 90
20
10 0 03045 160 DIESEL FUEL ONLY
0 MPH 100 P R N D 2 1
65
0 216
Figure 19
The diagnostic connector is still a three wire GREEN connector and the outer two wires are jumped to retrieve
codes. The wire colors to jump are BLACK/WHITE and solid BLACK as seen in Figure 20.
The code format remains the same as in the previous model.
DIAGNOSTIC
CONNECTOR
(3 WIRE) BRAKE
MASTER
CYLINDER
JUMP OUTER
2 WIRES
Figure 20
Automatic Transmission Service Group
Techn ical Se rvice Inf ormation
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ISUZU NPR/GMC FORWARD TILTMASTER
& CHEVY FORWARD
1999 CODE RETRIEVAL PROCEDURE
Use the chart in Figure 21 For 1999 code definitions.
DTC CODE PATTERN CODE DESCRIPTION
OFF Vehicle Speed Sensor #1 circuit open or shorted
11 (Located on Extension Housing, Pulse Generator)
ON
Figure 21
Figure 22
To clear trouble codes on 1999 Isuzu NPR, Chevy Forward and GMC Tiltmaster, the following procedure
must be performed. Each step must be performed for at least 5 seconds.
1. Turn key on, do not start engine.
2. Jump diagnostic connector terminals 1 and 3 as seen in Figure 22.
3. Move the manual selector shaft to the Neutral position.
4. Depress the brake fully and hold.
5. Depress the accelerator pedal fully and hold.
If the memory is clear, the “Check Trans” lamp will flash rapidly for 10 seconds.
Code 21, for a TPS circuit fault may not clear even though all TPS circuits and related components are
within specifications. Stacked shifts may also be experienced.
These vehicles require a TPS relearn procedure whenever the engine, injection pump, accelerator cable,
throttle linkage, throttle position sensor, kickdown switch or TCM are replaced. Failure to do so will result
in the above complaints.
Preliminary Checks:
1. Turn the idle control knob fully counterclockwise (Off).
2. Make sure the idle lever on the injection pump rests against the idle stop.
3. There must be 5 to 10 mm of pedal free play.
4. Depress the accelerator pedal to full throttle, the pedal should stop 0.0 to 2.0 mm above the floor mounted
stopper bolt, (Refer to Figure 23).
5. Depress the accelerator pedal to the floor, making certain the engine control lever on the injection pump
contacts the full throttle stop bolt.
6. Depress the accelerator pedal by hand while verifying that the Kickdown Switch makes contact between
95 to 100% throttle, (You will here the switch “CLICK”).
TCM/TPS Clearing:
1. Move the shift lever to “1”.
2. Turn the ignition “ON”.
3. Turn the overdrive switch “OFF”, (O/D Lamp illuminated).
4. Depress the accelerator pedal to WOT until you hear the Kickdown Switch “CLICK” and HOLD the
pedal at 100% throttle opening.
5. Depress and HOLD the brake pedal.
Early TCMs will flash the “CHECK TRANS” Lamp 5 times.
Late TCMs will flash the “CHECK TRANS” Lamp 5 times slow and then 6 times fast.
6. Release the accelerator and brake pedals.
7. Turn the ignition “OFF”.
continued...
Idle Relearn:
1. Start the vehicle.
2. Depress the accelerator to an engine speed of 1000 rpm 3 times slowly, allowing the pedal to return
completely to its rest position each time.
3. Turn the ignition “OFF”.
4. Remove the jumper wire from the GREEN TCM DLC.
5. Connect the WHITE single pin FICD connector.
5-10MM
FREE PLAY
THESE ADJUSTMENTS CAN BE USED FOR THE 2000 & LATER APPLICATIONS
Figure 23
Figure 24
FDIC
CONNECTOR
(WHITE) EMISSIONS TCM DATA LINK
CONNECTOR
CONNECTOR (GREEN)
(TAN)
Figure 25
To retrieve codes:
The three wire diagnostic jump connector located at the driver side kick panel area has been eliminated.
These vehicles have an OBD-II connector that can be used to retrieve flash codes in the same long and short digit
format.
Locate the OBD-II diagnostic connector as shown in Figure 26. Jump terminals 4 and 11 also seen in Figure 26.
and read the code pattern using the “Check Trans “ lamp on the instrument cluster as seen in Figure 27.
NOTE: Connecting a scan tool to the OBD-II connector will produce engine diagnostics only.
OBD-II DIAGNOSTIC
CONNECTOR
JUMP TERMINALS
4 AND 11 TO
RETRIEVE CODES
OBD-II DIAGNOSTIC
CONNECTOR
Figure 26
CHECK
TRANS CHECK
BRAKE VACUUM ON
OFF TRANS
40 50 60 LAMP
30 60 80 100 70
120 80 C H
20 40 143045 E F
140 90
20
10 0 03045 160 DIESEL FUEL ONLY
0 MPH 100 P R N D 2 1
65
0 216
Figure 27
Use the code chart in Figure 28 for the 2000 - 2006 models.
DTC CODE PATTERN CODE DESCRIPTION
OFF Vehicle Speed Sensor #1 circuit open or shorted
11 (Located on Extension Housing, Pulse Generator)
ON
Figure 28
Automatic Transmission Service Group
Techn ical Se rvice Inf ormation
22
2000 - 2006 ISUZU NPR; CHEVY FORWARD;
GMC TILTMASTER
TPS RELEARN PROCEDURE
Code 21, for a TPS circuit fault may not clear even though all TPS circuits and related components check
within specifications. Stacked shifts may also be experienced.
These vehicles require a TPS relearn procedure whenever the engine, injection pump, accelerator cable,
throttle linkage, throttle position sensor or kickdown switch are replaced. Failure to do so will result in the
above complaints.
continued...
Confirmation of Relearn
Stop the engine. Turn the starter switch to the “ON” position, the “Check Trans” lamp should begin flashing
again. Depress the accelerator pedal fully and release the pedal slowly.
NOTE: If the WOT voltage is out of spec, or the TCM did not learn any value, the “Check Trans” lamp will
continue to flash continuously. In this case begin the relearn procedure over again. If the relearn was
successful, the flashing will stop.
NOTE: This manual relearn procedure is complicated at best. If it must be done multiple times because of
unsuccessful attempts, it may be wise to have it done at the dealer or by a TECH II or Mastertech scan tool
that contains the appropriate software that you own or can acquire.
OBD-II DIAGNOSTIC
CONNECTOR
4
11
OBD-II DIAGNOSTIC
CONNECTOR
Figure 29
Locate the OBD-II diagnostic connector as shown in Figure 30. Jump terminals 4 and 11 also seen in Figure 30
and read the code pattern using the “Check Trans “ lamp on the instrument cluster as seen in Figure 31.
The “Check Trans” Lamp will display a DTC 3 times. If more than one code is present, the codes will output in
numerical order with each code being repeated 3 times. The display will continue as long as the Data Link
Connector is jumped.
JUMPER WIRE
11
4
DATA LINK
CONNECTOR
Figure 30
CHECK
TRANS
LAMP
Figure 31
The “Check Trans” Lamp” warning patterns can be seen in Figure 32.
NORMAL ABNORMAL
Problem
Key Switch ON Occurred
ON
ON Constant
Flashing
OFF OFF
2.0 Sec. 4.0 Sec. 0.4 0.4 0.4 0.4 0.4
Seconds
NO TCM RELEARN
Key Switch ON
ON
OFF
Figure 32
Automatic Transmission Service Group
Techn ical Se rvice Inf ormation
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ISUZU NPR/GMC FORWARD TILTMASTER
& CHEVY FORWARD
2007 - 2013 CODE RETRIEVAL PROCEDURE
Examples of the code pattern can be seen in Figure 33.
Seconds
4.0 1.0 0.4 1.0 0.4 1.0 1.2 0.4 0.4 0.4 4.0 1.0
Seconds
Figure 33
Use the code charts in Figures 34 & 35 for 2007 & Later code definitions. OBD-II codes have also been
provided.
FLASH OBD-II
CODE DEFINITION
CODE CODE
11 P0722 Output Speed Sensor Circuit Voltage Low
11 P0723 Output Speed Sensor Circuit Voltage Intermittent
13 P0727 Engine Speed - No Signal
14 P0717 Input Speed Sensor Circuit Voltage Low
15 P0712 Transmission Fluid Temperature Sensor Circuit Voltage Low
16 P0713 Transmission Fluid Temperature Sensor Circuit Voltage High
17 P0707 Transmission Range Sensor Circuit Voltage Low
17 P0708 Transmission Range Sensor Circuit Voltage High
18 P0711 Transmission Fluid Temperature Sensor Performance
19 P1382 Anti-Lock Brake Communication Malfunction
24 P0503 Vehicle Speed Sensor Circuit Intermittent
25 P0880 Transmission Control Module Power Input Signal Malfunction
26 P2742 Transmission Fluid Temperature Sensor 2 Circuit Voltage Low
27 P2743 Transmission Fluid Temperature Sensor 2 Circuit Voltage High
28 P2741 Transmission Fluid Temperature Sensor 2 Performance
31 P0973 Shift Solenoid 1 Control Circuit Voltage Low
31 P0974 Shift Solenoid 1 Control Circuit Voltage High
32 P0976 Shift Solenoid 2 Control Circuit Voltage Low
32 P0977 Shift Solenoid 2 Control Circuit Voltage High
Figure 34
Automatic Transmission Service Group
Techn ical Se rvice Inf ormation
27
ISUZU NPR/GMC FORWARD TILTMASTER
& CHEVY FORWARD
2007 - 2013 CODE RETRIEVAL PROCEDURE
FLASH OBD-II
CODE DEFINITION
CODE CODE
33 P0979 Shift Solenoid 3 Control Circuit Voltage Low
33 P0980 Shift Solenoid 3 Control Circuit Voltage High
34 P0982 Shift Solenoid 4 Control Circuit Voltage Low
34 P0983 Shift Solenoid 4 Control Circuit Voltage High
35 P0748 Pressure Control Solenoid 1 Control Circuit Malfunction
36 P0778 Pressure Control Solenoid 2 Control Circuit Malfunction
37 P0475 Exhaust Brake Cut Request Circuit Malfunction
38 P0798 Pressure Control Solenoid 3 Control Circuit Malfunction
39 P2716 Pressure Control Solenoid 4 Control Circuit Malfunction
41 P0751 Shift Solenoid 1 Valve Performance - Stuck Off
42 P0756 Shift Solenoid 2 Valve Performance - Stuck Off
43 P0761 Shift Solenoid 3 Valve Performance - Stuck Off
44 P0766 Shift Solenoid 4 Valve Performance - Stuck Off
45 P0746 Pressure Control Solenoid 1 Performance
46 P0776 Pressure Control Solenoid 2 Performance
48 P0796 Pressure Control Solenoid 3 Performance
61 P1790 Transmission Control Module ROM Failure
62 P1791 Transmission Control Module RAM Failure
63 P0602 Transmission Control Module Not Programmed
65 U2104 CAN Bus Counter Overrun
67 U2105 Lost Communications With Engine Control Module
71 P0561 System Voltage Unstable
72 P0562 System Voltage Low
73 P0563 System Voltage High
78 P084B Transmission Fluid Pressure Sensor H Circuit Performance
81 P0730 Incorrect Gear Ratio
91 P0741 Torque Converter Clutch System - Stuck Off
92 P0742 Torque Converter Clutch System - Stuck On
Figure 35
Automatic Transmission Service Group
Techn ical Se rvice Inf ormation
28
ISUZU NPR/GMC FORWARD TILTMASTER
& CHEVY FORWARD
2007 - 2013 INITIAL LEARN PROCEDURE
ATF
OVERTEMP
LAMP
Figure 36
The purpose of the Initial Learn procedure is to reset the TCM shift adapts. The Initial Learn procedure is
performed after transmission repairs or TCM replacement to insure proper shift characteristics and to
prevent the storage of “ghost” codes.
The ATF Overtemp Lamp shown in Figure 36 will flash during the Initial Learn Mode. If the TCM detects
the vehicle is moving, the Initial Learn will be inhibited. To avoid this, follow the Initial Learn Procedure
below:
Preparation of the Initial Learn
1. Turn OFF all electrical accessories.
2. Set park brake and chock the wheels.
3. Make certain ATF level is correct.
4. Start the engine.
5. Using a capable scan tool or infra red temperature sensing device to verify that the sump temperature is
between 104° F (40° C) and 194° F (90° C).
6. Shift from the N Range to the D Range 5 times.
Important Note: The above procedure must be performed to ensure completion of the learning procedure.
ON
2 SEC.
OFF
1 SEC.
Figure 37
3. Depress the brake pedal with your LEFT foot. DO NOT RELEASE THE BRAKE PEDAL UNTIL
INSTRUCTED TO DO SO.
4. Confirm the engine is at idle and the Overdrive Switch is ON, (switch is IN).
5. Move the Shift lever from D to 2 Range, then back to D 3 times, (D-2-D-2-D-2-D).
6. Confirm that the Overtemperature Lamp is flashing the pattern seen below in Figure 38.
LEARNING MODE
0.2 SEC.
ON
OFF
0.2 SEC.
Figure 38
7. Turn Overdrive Switch OFF, (Switch is OUT).
Learning 1
0.2 SEC. 0.5 SEC. 0.2 SEC.
ON
OFF
0.2 SEC. 0.2 SEC.
0.5 SEC.
Figure 39
9. When the Overtemperature Lamp begins to blink quickly, using your right foot, accelerate and hold the
engine speed between 1000 and 1500 RPM using the accelerator pedal.
10. Turn the Overdrive ON (switch is IN). The Overtemperature Lamp will begin to blink slowly as seen in
Figure 40.
Learning 2
Learning 1
0.2 SEC.
0.5 SEC.
ON
OFF
0.2 SEC.
0.5 SEC.
Figure 40
11. When the Overtemperature Lamp turns OFF, release the accelerator pedal.
12. Move the transmission shift lever to the Reverse Range.
13. Turn the Overdrive OFF (switch is OUT). The Overtemperature Lamp will begin to blink slowly as seen
in Figure 41.
Learning 3
OFF
0.2 SEC.
0.5 SEC.
Figure 41
14. When the Overtemperature Lamp begins to blink quickly, using your right foot, accelerate and hold the
engine speed between 1000 and 1500 RPM using the accelerator pedal.
15. Turn Overdrive Switch ON (switch is IN). The Overtemperature Lamp will blink slowly.
16. When the Overtemperature Lamp begins to blink 1 second ON and 2 seconds OFF, as seen in Figure 42,
release the accelerator pedal.
Learning 4
Learning 3
0.2 SEC. 0.5 SEC.
ON
2 SEC.
1 SEC.
OFF
0.2 SEC.
0.5 SEC.
Figure 42
NOTE #1: Only those malfunctions detected when the vehicle was previously driven remain in history.
NOTE #2: Codes stored in memory will only be erased if the ignition is turned OFF after performing the
code retrieval procedure.
NOTE #3: If Vehicle Speed Sensor #1 and #2 fail simultaneously, the diagnostic lamp will flash
continuously.
DIAGNOSTIC LAMP
POWER/ECONOMY
MODE SWITCH
Figure 43
Use the code retrieval procedure in Figure 44 for the 1988-94 models.
CODE RETRIEVAL PROCEDURE
1. Turn power mode switch to "OFF" 7. Turn power mode switch to "ON"
2. Turn key "ON" 8. Turn key "ON"
3. Does the power mode indicator lamp 9. Place selector lever to the "2" position
illuminate for 2 seconds? 10. Turn power mode switch to "OFF"
4. Turn key to "ACC" 11. Place selector lever to the "L" position
5. Confirm accelerator is fully closed 12. Turn power mode switch to "ON"
6. Place selector lever to the "D" position 13. Depress accelerator fully
Figure 44
Figure 45
To Clear Codes:
Perform the code retrieval procedure in Figure 44, then turn the ignition “OFF”.
At this time, if no problems persist, all codes will be cleared from the ACTU memory.
Automatic Transmission Service Group
Techn ical Se rvice Inf ormation
34
MITSUBISHI FUSO FE & FG SERIES
1995-98 CODE RETRIEVAL PROCEDURE
Code retrieval for 1995-98 trucks can have TWO procedures for retrieving codes:
Procedure #1: Use the same code call-up procedure as the 1988-94 trucks as seen in Figure 44.
The code format is the same and is seen in Figure 45.
Procedure #2: Locate the single wire Diagnostic Switch (Connector), which is found under the passenger
side corner of the dashboard close to the floor as seen in Figure 46.
The wire color on one side of the Diagnostic Switch should have a YELLOW/GREEN wire,
and the wire color on the other side of the connector should have a GREEN/BLUE wire.
Turn the ignition "ON" and then unplug the Diagnostic Switch (Connector).
The Transmission Warning Lamp, See Figure 47, will now flash the codes that are stored in
the AT-ECU memory. The code pattern is a two digit type with the first digit producing
LONG flashes, and the second digit producing SHORT flashes.
If no faults are detected when the ignition is turned on, The Transmission Warning Lamp
(See Figure 47) will illuminate for two seconds and then go out. If a fault is detected, the
Transmission Warning Lamp will flash for eight seconds each time the ignition is cycled.
DIAGNOSIS SWITCH
CONNECTOR
Figure 46
40 50 2 3
30 60
1 4
20 70
80 0- 5
10
0 90
Figure 48
Automatic Transmission Service Group
Techn ical Se rvice Inf ormation 36
MITSUBISHI FUSO FE & FG SERIES
1995-98 CODE CLEARING PROCEDURE
To clear fault codes stored in memory, locate the under dash fuse box and remove the F10 fuse as shown
in Figure 49, for at least 10 seconds.
Figure 49
Retrieving codes on 1999-2004 Mitsubishi Fuso tilt cab medium duty trucks equipped with the Aisin Seiki,
450-43LE transmission.
The TCM does not communicate with aftermarket scan tools, data is not available and code retrieval must
be done via the flash code method.
The illustration in Figure 50 shows the location of the “Diagnosis Switch” and the “Memory Clear Switch”,
both of which are single pin connectors.
To retrieve current codes do the following:
1 - Turn the ignition “ON”.
2 - Disconnect the “Diagnosis Switch”. The “Diagnosis Switch” connector will have a Green/Blue wire on
one side of the connector and a Black wire on the other side.
3 - Watch the transmission warning lamp located below the instrument cluster shown in figure 51 for the
flash code pattern as seen in Figure 52.
Use the code charts in Figures 53 and 54 for the 1999-2004 models.
CL
M E EA R
MO
RY
DI A G
K
CHEC
MEMORY
CLEAR DIAGNOSIS
SWITCH SWITCH
(BLACK/WHITE (GREEN/BLUE
& BLACK WIRES) & BLACK WIRES)
Figure 50
40 50 2 3
30 60
1 4
20 70
80 0- 5
10
0 90
AUTOMATIC TRANSMISSION
WARNING LAMP
Figure 51
ON
BEGINNING OF
2ND TIME
OFF INDICATION
Figure 52
24 FE640 When accelerator sensor signal input to ·Shift point is set at 0% throttle opening.
engine ECU is faulty. ·Prohibits 2-3 shift timing control.
·Executes controls assuming that
throttle pressure is at maximum.
·Prohibits lock-up control (lock-up
solenoid OFF) except during driving at
high speeds.
Vehicle Speed Sensor 2 Vehicle speed sensor 2 indicates sudden ·Maintains the gear selected immediately
speed decrease. before malfunction detection.
25 ·Turns off shift solenoids 1 and 2 when
engine speed sensor detects a value of
less than 1000 rpm.
Shift Solenoid 1 ·When solenoid output short circuit occurs ·Turns off malfunctioning shift solenoid.
while solenoid is receiving current. ·Turns off lock-up solenoid and timing
31 ·When solenoid output disconnection occurs solenoid.
while solenoid is not receiving current.
Shift Solenoid 2 ·When solenoid output short circuit occurs ·Turns off malfunctioning shift solenoid.
while solenoid is receiving current. ·Turns off lock-up solenoid and timing
32 ·When solenoid output disconnection occurs solenoid.
while solenoid is not receiving current.
34 Line Pressure Solenoid When wire breakage or short circuit occurs. Turns off line pressure solenoid.
Lock-Up Solenoid ·When solenoid output short circuit occurs Turns off lock-up solenoid.
while solenoid is receiving current.
35 ·When solenoid output disconnection occurs
while solenoid is not receiving current.
Inhibitor Switch No signal Operates as D range and prohibits
shifting to 4th gear.
43
Two or more signals Control function activates based on
priority order of L>R>2>D>N(P).
Figure 53
Automatic Transmission Service Group
Techn ical Se rvice Inf ormation 41
1999-2004 DIAGNOSIS CODE CHART
DIAGNOSIS PROBLEM JUDGEMENT FAIL-SAFE
CODE LOCATION CRITERION MEASURE
PTO Solenoid ·When solenoid output short circuit occurs Turns off PTO solenoid.
while solenoid is receiving current.
50 ·When solenoid output is cut off while
solenoid is not receiving current.
Timing Solenoid ·When solenoid output short circuit occurs Turns off timing solenoid.
while solenoid is receiving current.
51 ·When solenoid output disconnection occurs
while solenoid is not receiving current.
Exhaust Brake Cut-Off Exhaust brake activates when exhaust brake ·Prohibits exhaust brake cut-off control.
54 Signal cut-off signal is generated. ·Allows lock-up only at high cruising
speed.
TPS PWM Signal Malfunction of engine electronic control ·Shift point is set at 0% throttle opening.
unit (PWM signal fixed at 1 V or lower). ·Prohibits 2-3 shift timing control.
·Line pressure at maximum.
58 ·Prohibits throttle position learning
function.
Wire breakage or short circuit. Prohibits throttle position learning
function.
Figure 54
Manual code retrieval procedure to retrieve two digit codes from the TCM is as follows:
The Diagnosis and Memory clear switches are dedicated fuses in the fuse box shown in Figure 56, do not exceed
the amp rating of the original fuse.
Diagnostic code charts that indicate both the five digit OBD-II codes as well as the two digit flash codes along
with the code definition can be found in the charts in Figures 57 and 58.
NOTE: When diagnosing a 2007 to 2009 Sterling 360 cab over truck, use the Mitsubishi Fuso diagnostics
because the Sterling 360 trucks during this time period were manufactured by Mitsubishi Fuso.
TRANSMISSION
WARNING
LAMP
C
H
K !
T/M OIL 5
TEMP 40
8
3 4 30 60
40
2 20
20
1 10 0
0
0 X 1000r/min
Figure 55
10
10
10
10
10
15
15
20
20
20
5 10 20 5 30
30
20
20
10
15
10
10
10
10
10
15
10
15
10
10
10
10
5
Mitsubishi Fuso trucks equipped with the M036A6 Aisin 6 speed automatic transmission require a shift
adapt reset procedure known as “Dealer Adjust”. This is done to allow the TCM to learn the new clutch
clearances and clutch apply times in order to produce the proper transmission shift characteristics. Dealer
Adjust should be performed whenever the transmission has been overhauled or replaced, or the TCM has
been replaced.
NOTE: If at any time the Transmission Temperature Lamp goes out or stops flashing, restart the
“Dealer Adjust” procedure from step 8.
10
10
10
10
10
15
15
20
20
20
5
5 10 20 5 30
30
20
20
10
15
10
10
10
10
10
15
10
15
10
10
10
10
5
Figure 60
Automatic Transmission Service Group
Techn ical Se rvice Inf ormation
48
NISSAN UD 1100/1400 SERIES
1988-94 CODE RETRIEVAL PROCEDURE
The code retrieval procedure for the 1988-94 Nissan UD trucks is just like most other Nissan vehicles which
means, various controls in the vehicle must be operated in a particular sequence, after which the "O/D
OFF" Lamp shown in Figure 61 will flash a judgement flash that is longer than the other flashes.
If no faults are detected by the A/T Control Unit, the O/D Lamp will come on for 2 seconds and then go out.
When a fault is detected the "O/D OFF" Lamp will flash 16 times to alert the operator that there is a
transmission related malfunction. The chart in Figure 62 illustrates the code call-up procedure.
Figure 61
Use the Code Retrieval Procedure chart in Figure 62 for 1988-94 models.
1. Turn ignition switch to "OFF" after warming engine 8. Turn O/D switch to "OFF"
2. Set O/D switch to "ON" 9. Turn ignition "ON"
3. Turn ignition "ON" 10. Place selector lever to the "2" position
4. Does the "O/D OFF" indicator lamp 11. Turn O/D switch to "ON”
illuminate for 2 seconds? 12 .Place selector lever to the "1" position
5. Turn ignition "OFF" 13. Turn O/D switch to "OFF"
6. Confirm accelerator is fully released 14. Depress accelerator fully and release it
7. Place selector lever to the "D" position
Figure 62
Figure 63
1. Turn ignition switch to "OFF" after warming engine 8. Turn O/D switch to "OFF"
2. Set O/D switch to "ON" 9. Turn ignition "ON"
3. Turn ignition "ON" 10. Place selector lever to the "2" position
4. Does the "O/D OFF" indicator lamp 11. Turn O/D switch to "ON”
illuminate for 2 seconds? 12 .Place selector lever to the "1" position
5. Turn ignition "OFF" 13. Turn O/D switch to "OFF"
6. Confirm accelerator is fully released 14. Depress accelerator fully and release it
7. Place selector lever to the "D" position
Figure 64
The O/D “OFF” Lamp will flash the code judgement pattern.
Figure 65
Automatic Transmission Service Group
Techn ical Se rvice Inf ormation
51
NISSAN UD 1100/1400 SERIES
1995-98 CODE RETRIEVAL PROCEDURE
Use this code chart for 1995-98 models.
All judgements flickers same . . All circuits that can be checked by self diagnosis are
functioning.
1st judgement flicker longer . . . Revolution sensor circuit is shorted or open.
2nd judgement flicker longer . . . Speed sensor circuit is shorted or open.
3rd judgement flicker longer . . . Control Lever sensor circuit is shorted or open.
4th judgement flicker longer . . . Shift solenoid "A" circuit is shorted or open.
5th judgement flicker longer . . . Shift solenoid "B" circuit is shorted or open.
6th judgement flicker longer . . . Overrun solenoid is shorted or open.
7th judgement flicker longer . . . Lock-up solenoid circuit is shorted or open.
8th judgement flicker longer . . . ATF temp. sensor is shorted or open, or A/T control unit
power source is shorted or open.
9th judgement flicker longer . . . Engine revolution signal circuit is shorted or open.
10th judgement flicker longer . . . EPC solenoid circuit is shorted or open.
Figure 66
When the “ATM” Lamp in the instrument cluster is steadily flashing, (Figures 67 for 1998 to 2002 models &
Figure 68 for 2003 to 2010 models), at 0.5 second intervals, follow the code retrieval procedure below:
Use the code chart in Figure 70 for 1999 to 2004 models and the chart in Figure 71 for 2005 to 2010 models.
If no codes are present, the “ATM” Lamp will flash code 1 continuously.
When the memory is cleared, the “ATM” Lamp will flash on and off at 0.2 second intervals for 10 seconds.
ATM
2 3
40 50 1 4
30 60
70 5
20
10 80
0 90
1999-2002
Figure 67
ATM
2003 - 2010
Figure 68
DIAGNOSTIC CONNECTORS
WITH ID TAG “A”
JUMP TO RETRIEVE CODES
Figure 69
Figure 70
Figure 71
1 - Using a jumper lead, jump diagnostic connector terminals TC and SGND as shown below in Figure 72.
The location of the Diagnostic Connector can be seen in Figure 73.
2 - Turn the key switch ON.
3 - Read the diagnostic flash pattern displayed by the Overdrive OFF Lamp located in the instrument cluster
as seen in Figure 73.
NOTE: The Hino 145/165 and 185 model trucks were not produced for 2011 & 2012.
DIAGNOSTIC CONNECTOR
TC
S
GND
Figure 72
O/D
OFF
HINO
O/D OFF
DIAGNOSTIC SWITCH
CONNECTOR
Figure 73
Automatic Transmission Service Group
Techn ical Se rvice Inf ormation
58
HINO 145/165/185 WITH AW450-43LE
2005-2010 CODE RETRIEVAL PROCEDURE
DIAGNOSTIC NOTES:
If the system is without faults and is operating normally the O/D OFF Lamp will come on for 0.5 seconds
and go out for 1.5 seconds repeatedly as shown by the flash pattern in Figure 74.
ON
OFF
Figure 74
DIAGNOSTIC NOTES:
If one fault code is output, the same code will be output again after an interval of 0.4 seconds, if several
codes are output, a different code will be output after a 2.5 second interval. After all codes have been output,
the entire cycle will be repeated after a 4.0 second interval, this flash pattern is shown in Figure 75 below.
If two or more codes are output, they will be displayed in numerical ascending order.
OBD-II Diagnostic Codes can be retrieved with a capable scan tool using the Diagnostic Connector shown
in Figure 73.
EXAMPLE: CODE 12
OFF
Next Code Output
Diagnosis Start
Figure 75
Automatic Transmission Service Group
Techn ical Se rvice Inf ormation
59
HINO 145/165/185 WITH AW450-43LE
2005-2010 CODE RETRIEVAL PROCEDURE
Figure 76
1 - Using a jumper lead, jump diagnostic connector terminals TC and SGND as shown below in Figure 77.
The location of the Diagnostic Connector can be seen in Figure 73.
2 - Turn the key ON.
3 - Push the Overdrive Cancel Button located on the shift handle so it indicates overdrive has been canceled.
4 - Remove the jumper lead from the diagnostic connector terminals.
5 - Turn the key switch OFF.
6 - Using the jumper lead, reconnect Diagnostic Connector terminals TC and SGND as seen in Figure 77.
7 - Turn the key switch ON.
8 - Check to see that a normal flash pattern is being displayed indicating all codes have been cleared as seen
in Figure 78.
DIAGNOSTIC CONNECTOR
TC
S
GND
Figure 77
ON
OFF
Figure 78
NOTE: The Hino 155/155h/195 and 195h model trucks were not produced for 2011 & 2012.
13
Figure 79
Automatic Transmission Service Group
Techn ical Se rvice Inf ormation
62
HINO 155/155h/195/195h WITH A465
2013-2014 CODE RETRIEVAL PROCEDURE
.. ..
! LOW
PWR
.. ..
.. DEF
A
OFF
F H F 30
ECO 20
DEF
ECO 10
MODE miles
E C E 0inHg
A
OD OFF
LAMP A/T CHECK
LAMP
Figure 80
LIGHT OFF
Figure 81
4.0 0.5 1.5 0.5 0.5 2.5 0.5 0.5 1.5 0.5 0.5 0.5
Secs. Secs. Secs. Secs. Secs. Secs. Secs. Secs. Secs. Secs. Secs. Secs.
LIGHT ON
LIGHT OFF
Figure 82
OVERDRIVE OFF
SWITCH
Figure 83
NOTE: If the A/T oil temperature warning lamp turns ON for 2 seconds, then turns OFF for 1 second
repeatedly during A/T learned value initialization mode, turn the starter key to the “Lock” position, make
certain the vehicle is at a complete stop and then begin the initialization process from the beginning.
Before beginning the initialization process, turn OFF all electrical loads such as headlights, AC, etc. and
apply the parking brake.
Make certain the transmission fluid level is correct and that engine temperature is at normal operating
temperature. Move the shift lever from N to D 5 times and then repeat this step moving the shift lever from
N to R.
NOTES: If the A/T oil temperature warning lamp is flashing at 0.2 second intervals, this indicates that the
vehicle is set in the “A/T Learned Value Initialization Mode”.
If the A/T oil temperature warning lamp is out, make certain all the components in the above procedure are
functioning correctly and perform the above steps again.
If the A/T oil temperature warning lamp remains ON, this indicates that the attempt to enter the “A/T
Learned Value Initialization Mode” has failed, make certain all the components in the above procedure are
functioning correctly and perform the above steps again.
13
Figure 86
Automatic Transmission Service Group
Techn ical Se rvice Inf ormation
67
HINO 155/155h/195/195h WITH A465
2013-2014 RELEARN PROCEDURES
A/T INITIAL LEARNING MODE
0.2 Seconds
LIGHT ON
LIGHT OFF
0.2 Seconds
Figure 87
Performing “A/T Learned Value Initialization 1:
1 - Make certain that engine idle rpm is normal and stable.
2 - With the foot brake pedal depressed, move the shift lever to the D position. Do not release the
brake or move the shift lever until “A/T Learned Value Initialization 1” has been completed.
3 - Turn the overdrive switch ON (light off) to OFF (light on).
4 - Check to see that the A/T oil temperature warning lamp changes its flash pattern to 0.5 second
intervals.
NOTE: If the A/T oil temperature warning lamp flashes at 0.5 second intervals, this indicates that the “A/T
Learned Value Initialization 1” is underway.
5 - Check to see that the A/T oil temperature warning lamp flash changes from 0.5 to 0.2 seconds
intervals as seen in Figure 88.
PERFORMING A/T LEARNED VALUE INITIALIZATION 1
LIGHT OFF
Figure 88
Automatic Transmission Service Group
Techn ical Se rvice Inf ormation
68
HINO 155/155h/195/195h WITH A465
2013-2014 RELEARN PROCEDURES
NOTES: If the flashing interval of the A/T oil temperature warning lamp changes to 0.2 second intervals,
this indicates that the “A/T Learned Value Initialization 1” is completed.
If the A/T oil temperature warning lamp remains ON, this indicates that the attempt to enter the “A/T
Learned Value Initialization Mode” has failed, make certain all the components in the above procedure are
functioning correctly and perform the above steps again.
LIGHT OFF
Figure 89
LIGHT OFF
Figure 90
LIGHT OFF
Figure 91
NOTES: When the “A/T Learned Value Initialization 4” is completed, the A/T oil temperature warning
lamp repeats the cycles of going OFF for 2 seconds followed by going ON for 1 second.
If the “A/T Learned Value Initialization 4” is not completed, the A/T oil temperature warning lamp will turn
ON.
If the A/T oil temperature warning lamp goes ON, this indicates that the attempt to perform the “A/T
Learned Value Initialization 4” has failed, make certain all the components in the above procedure are
functioning correctly and perform the above steps again.
4 - Place the shift lever in the P position.
5 - Remove the jumper lead from the DLC3.
6 - Turn OFF the engine.
LIGHT ON
2 SECONDS
1 SECOND
LIGHT OFF
IGNITION OFF
Figure 92
reading codes
Step 5: The Check Trans, Trans Temp and Tow/Haul
all turn ON simultaneously to indicate diagnostic
mode has been entered. (See Figure 96)
Flash format
on
The Check Trans will communicate each digit Flashes
flash
When all Fault Codes have been Flashed, the Trans Temp 2 times
indicator will Flash twice and the Tow Haul will go OFF.
Figure 93
Figure 94
TOW
R
N
D
3
2
1
Figure 95
82145.6 MI
134.6 TRIP
Figure 96
Automatic Transmission Service Group
Techn ical Se rvice Inf ormation
75
FORD/INTERNATIONAL HARVESTER LCF with 5R110W
5R110W DIAGNOSTIC TROUBLE CODE CHART
Flash OBDll Diagnostic Code Diagnostic Trouble Code
DTC DTC Description/Symptom Description
113 P0706 Transmission Range Transmission Range sensor signal out of range or
114 P0707 (TR-P) Sensor duty cycle is below threshold, sensor/circuit elect.
malfunction.
115 P0708 Transmission Range Transmission Range sensor signal duty cycle is above
(TR-P) Sensor threshold, sensor/circuit elect. malfunction.
412 P1702 Transmission Range Transmission Range sensor circuit failure, or KOEO or
413 P1705 (TR-P) Sensor KOER not run in P or N positions.
122 P0711 Trans Fluid Temp PCM has detected no TFT change during operation.
(TFT) Sensor Stuck at some normal reading.
123 P0712 Trans Fluid Temp Voltage drop across TFT sensor exceeds scale set for
121 P0710 (TFT) Sensor temperature of 315°F.
124 P0713 Trans Fluid Temp Voltage drop across TFT sensor exceeds scale set for
121 P0710 (TFT) Sensor temperature of minus 40°F.
414 P1711 Trans Fluid Temp Transmission not operating at normal temperature
(TFT) Sensor during On-Board diagnostics.
423 P1783 Trans Fluid Temp Transmission over temp condition indicated.
(TFT) Sensor
125 P0715 Turbine Shaft Speed PCM detected a loss of TSS signal during normal
(TSS) Sensor operation.
131 P0717 Turbine Shaft Speed PCM has not detected a TSS signal.
(TSS) Sensor
132 P0718 Turbine Shaft Speed PCM has detected a noisy TSS signal.
(TSS) Sensor
133 P0720 Output Shaft Speed PCM detected a loss of OSS signal during normal
(OSS) Sensor operation.
134 P0721 Output Shaft Speed PCM has detected a noisy OSS signal.
(OSS) Sensor
136 P0722 Output Shaft Speed PCM has detected no OSS signal.
(OSS) Sensor
141 P0730 Clutch Control Solenoid PCM has detected a gear ratio error.
or Internal Problem
142 P0740 TCC Solenoid TCC Solenoid, Electrical, Open Circuit.
143 P0741 TCC Solenoid
Figure 97
Automatic Transmission Service Group
Techn ical Se rvice Inf ormation
76
FORD/INTERNATIONAL HARVESTER LCF with 5R110W
5R110W DIAGNOSTIC TROUBLE CODE CHART
Flash OBDll Diagnostic Code Diagnostic Trouble Code
DTC DTC Description/Symptom Description
144 P0742 TCC Solenoid TCC Solenoid circuit, shorted to ground.
Figure 99
Figure 100