2004 ISUZU TF SERIES Workshop Manual

child restraint clutch park assist change time tow reset

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ISUZU TF SERIES 2004 Workshop Manual DIAGNOSIS (JR405E) 7A2-1
SECTION 7A2
DIAGNOSIS
TABLE OF CONTENTS
PAGE
BASIC TROUBLE SHOOTING..................................................................................................7A2

DIAGNOSIS (JR405E) 7A2-1
SECTION 7A2
DIAGNOSIS
TABLE OF CONTENTS
PAGE
BASIC TROUBLE SHOOTING..................................................................................................7A2-6
CHECK TRANS INDICATOR & SELF DIAGNOSIS..............................................................7A2-7
DIAGNOSIS WITH TECH 2........................................................................................................7A2-9
TECH 2 CONNECTION .................................................................................................. 7A2-9
TECH 2 OPERATING FLOW CHART (START UP)..............................................................7A2-10
TYPICAL SCAN DATA................................................................................................................7A2-13
MISCELLANEOUS TEST...........................................................................................................7A2-14
INTERMITTENT DIAGNOSIS....................................................................................................7A2-16
SNAPSHOT DISPLAY WITH TIS 2000....................................................................................7A2-17
SERVICE PROGRAMMING SYSTEM (SPS) ................................................................. 7A2-21
CIRCUIT DIAGRAM.....................................................................................................................7A2-24
PART LOCATION........................................................................................................................7A2-26
CONNECTOR LIST.....................................................................................................................7A2-31
DIAGNOSIS TROUBLE CODE TABLE...................................................................................7A2-33
FAIL-SAFE FUNCTION..............................................................................................................7A2-35
DTC P0722 (FLASH CODE 11) VEHICLE SPEED SENSOR NO SIGNAL......................7A2-36
DTC P0727 (FLASH CODE 13) ENGINE REVOLUTION SENSOR NO SIGNAL............7A2-38
DTC P0717 (FLASH CODE 14) TURBINE SPEED SENSOR NO SIGNAL......................7A2-40
DTC P0710 (FLASH CODE 15) ATF TEMPERATURE SENSOR FAILURE....................7A2-42
DTC P0560 (FLASH CODE 16) SYSTEM VOLTAGE FAILURE........................................7A2-43
DTC P0705 (FLASH CODE 17) INHIBITOR SWITCH FAILURE........................................7A2-44
DTC P1120 (FLASH CODE 22) THROTTLE SIGNAL FAILURE........................................7A2-46
DTC P1875 (FLASH CODE 25) GND RETURN CIRCUIT FAILURE.................................7A2-47
DTC P0753 (FLASH CODE 31) LOW & REVERSE BRAKE DUTY
SOLENOID FAILURE................................................................................................................7A2-48
DTC P0758 (FLASH CODE 32) 2-4 BRAKE DUTY SOLENOID FAILURE......................7A2-51
DTC P0763 (FLASH CODE 33) HIGH CLUTCH DUTY SOLENOID FAILURE................7A2-54
DTC P0768 (FLASH CODE 34) LOW CLUTCH DUTY SOLENOID FAILURE................7A2-57

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ISUZU TF SERIES 2004 Workshop Manual 7A2-2 DIAGNOSIS (JR405E)
PAGE
DTC P0748 (FLASH CODE 35) LINE PRESSURE SOLENOID FAILURE.......................7A2-60
DTC P1860 (FLASH CODE 36) LOCK-UP DUTY SOLENOID FAILURE........................

7A2-2 DIAGNOSIS (JR405E)
PAGE
DTC P0748 (FLASH CODE 35) LINE PRESSURE SOLENOID FAILURE.......................7A2-60
DTC P1860 (FLASH CODE 36) LOCK-UP DUTY SOLENOID FAILURE.........................7A2-62
DTC P1853 (FLASH CODE 26) LOW & REVERSE BRAKE PRESSURE
SWITCH FAILURE......................................................................................................................7A2-64
DTC P1858 (FLASH CODE 27) 2-4 BRAKE PRESSURE SWITCH FAILURE................7A2-68
DTC P1863 (FLASH CODE 28) HIGH CLUTCH PRESSURE SWITCH FAILURE..........7A2-72
DTC P0731 (FLASH CODE 41) 1st GEAR RATIO ERROR................................................7A2-76
DTC P0732 (FLASH CODE 42) 2nd GEAR RATIO ERROR...............................................7A2-76
DTC P0733 (FLASH CODE 43) 3rd GEAR RATIO ERROR................................................7A2-76
DTC P0734 (FLASH CODE 44) 4th GEAR RATIO ERROR................................................7A2-76
DTC P1750 (FLASH CODE 51) LOW & REVERSE BRAKE FAIL-SAFE
VALVE FAILURE........................................................................................................................7A2-78
DTC P1755 (FLASH CODE 52) 2-4 BRAKE FAIL-SAFE VALVE FAILURE....................7A2-80
DTC P0602 Programming Error ................................................................................... 7A2-82
SYMPTOM DIAGNOSIS.............................................................................................................7A2-83
SYMPTOM DIAGNOSIS TABLE...............................................................................................7A2-84
No. A1: VEHICLE DOES NOT RUN IN D, 3, 2, L and RANGE..........................................7A2-93
No. A2: VEHICLE DOES NOT RUN IN R RANGE................................................................7A2-94
No. A3: VEHICLE DOES NOT RUN IN D, 3, 2 and RANGE...............................................7A2-95
No. B1: VEHICLE RUNS IN N RANGE...................................................................................7A2-96
No. B2: POOR ACCELERATION AT STARTING.................................................................7A2-97
No. B3: ENGINE RACE UP DURING STARTING (SLIP)....................................................7A2-100
No. B4: LARGE SHOCK WHEN SHIFT LEVER IS CHANGED TO N TO D
RANGE OR N TO R RANGE....................................................................................................7A2-103
No. B5: ENGINE STALLS WHEN SELECTING FROM N RANGE TO R, D, 3, 2
OR L RANGE...............................................................................................................................7A2-104
No. B6: ENGINE STARTER DOES NOT RUN IN P OR N RANGE...................................7A2-106
No. B7: ENGINE STARTER RUNS EXCEPT IN P OR N RANGE.....................................7A2-106
No. B8: EXTENDED TIME LAG WHEN SHIFT LEVER IS CHANGED TO N TO D........7A2-106
No. B9: EXTENDED TIME LAG WHEN SHIFT LEVER IS CHANGED TO N TO R........7A2-106
No. B10: BRAKE IS APPLIED IN R RANGE..........................................................................7A2-107
No. B11: INSUFFICIENT STARTING OR SHAKING IN D RANGE...................................7A2-107

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ISUZU TF SERIES 2004 Workshop Manual DIAGNOSIS (JR405E) 7A2-3
PAGE
No. B12: NOISE OR VIBRATION IS GENERATED AT STARTING..................................7A2-107
No. C1: ENGINE RACE UP (SLIP) WHEN GEAR IS SHIFTED UP TO 1st TO 2
nd...

DIAGNOSIS (JR405E) 7A2-3
PAGE
No. B12: NOISE OR VIBRATION IS GENERATED AT STARTING..................................7A2-107
No. C1: ENGINE RACE UP (SLIP) WHEN GEAR IS SHIFTED UP TO 1st TO 2
nd........7A2-108
No. C2: ENGINE RACE UP (SLIP) WHEN GEAR IS SHIFTED UP TO 2nd TO 3
rd.......7A2-108
No. C3: ENGINE RACE UP (SLIP) WHEN GEAR IS SHIFTED UP TO 3rd TO 4
th........7A2-108
No. C4: ENGINE RACE UP (SLIP) WHEN GEAR IS SHIFT DOWN ................................7A2-108
OR KICK-DOWN TO 4th TO 3
rd.................................................................................7A2-108
No. C5: ENGINE RACE UP (SLIP) WHEN GEAR IS SHIFT DOWN OR KICK-DOWN
TO 4th TO 2
nd..............................................................................................................................7A2-108
No. C6: ENGINE RACE UP (SLIP) WHEN GEAR IS SHIFT DOWN OR KICK-DOWN
TO 3rd TO 2
nd.............................................................................................................................7A2-108
No. C7: ENGINE RACE UP (SLIP) WHEN GEAR IS SHIFT DOWN TO 4th OR 3
rd
TO 1
st............................................................................................................................................7A2-108
No. C8: ENGINE RACE UP (SLIP) OTHERS.........................................................................7A2-108
No. C9: BARKING FEEL WHEN GEAR IS SHIFTED UP TO 1st TO 2
nd.........................7A2-111
No. C10: BARKING FEEL WHEN GEAR IS SHIFTED UP TO 2nd TO 3
rd......................7A2-111
No. C11: BARKING FEEL WHEN GEAR IS SHIFTED UP TO 3rd TO 4
th.......................7A2-111
No. C12: LARGE SHOCK WHEN GEAR IS SHIFTED TO 1st TO 2
ND OR 2nd TO 1st..7A2-114
No. C13: LARGE SHOCK WHEN GEAR IS SHIFTED TO 2nd TO 3
rd OR 3rd TO 2nd.7A2-114
No. C14: LARGE SHOCK WHEN GEAR IS SHIFTED TO 3rd TO 4th TO 3
rd................7A2-114
No. C15: LARGE SHOCK WHEN KICK-DOWN....................................................................7A2-114
No. C16: LARGE SHOCK WHEN NO ACCELERATION.....................................................7A2-114
No. C17: LARGE SHOCK WHEN GEAR IS SHIFTED DOWN TO 2nd TO
1st IN L RANGE..........................................................................................................................7A2-114
No. C18: LARGE SHOCK (OTHER)........................................................................................7A2-114
No. C19: LARGE SHOCK WHEN VEHICLE SPEED IS DOWNED BY NO
ACCELERATOR PANEL OR VEHICLE IS STOPPED........................................................7A2-114
No. C20: LARGE LOCK-UP SHOCK.......................................................................................7A2-114
No. C21: SHIFT DOWN OR ENGINE OVER-RUN WHEN THE ACCELERATION
PANE IS STEPPED ON IN 4th GEAR....................................................................................7A2-114
NO. D1: FAULTY GEAR SHIFTING (DIFFERENT FROM SHIFT PATTERN)............... 7A2-115
NO. D2: GEAR IS SHIFTED FREQUENTLY ................................................................. 7A2-120

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ISUZU TF SERIES 2004 Workshop Manual 7A2-4 DIAGNOSIS (JR405E)
PAGE
NO. D3: GEAR SHIFT POINT IS LOW OR HIGH AT ALL POINT................................. 7A2-120
NO. D4: GEAR SHIFT POINT IS LOW OR HIGH AT LIMITED POINT ..............

7A2-4 DIAGNOSIS (JR405E)
PAGE
NO. D3: GEAR SHIFT POINT IS LOW OR HIGH AT ALL POINT................................. 7A2-120
NO. D4: GEAR SHIFT POINT IS LOW OR HIGH AT LIMITED POINT ......................... 7A2-120
NO. D5: NO KICK-DOWN .............................................................................................. 7A2-120
NO. E1: NO GEAR SHIFT .............................................................................................. 7A2-121
NO. E2: ONLY 4TH GEAR (O/D) IS NOT SELECTABLE ............................................. 7A2-124
NO. E3: GEAR IS SHIFTED 2ND TO 3RD IN 2 RANGE ............................................... 7A2-126
NO. E4: GEAR IS SHIFTED 1ST TO 2ND IN L RANGE................................................ 7A2-126
NO. E5: GEAR IS SHIFTED 3RD TO 4TH IN 3 RANGE................................................ 7A2-126
NO. F1: LOW MAXIMUM SPEED OR POOR ACCELERATION ................................... 7A2-127
NO. F2: ENGINE RACES UP DURING ACCELERATION (SLIP) ................................. 7A2-130
NO. F3: NOISE OR VIBRATION DURING THE RUNNING IN R, D, 3, 2 OR L
RANGE .......................................................................................................................... 7A2-130
NO. F4: ENGINE BRAKE DOES NOT APPLY IN L RANGE......................................... 7A2-130
NO. F5: ENGINE STALLS BEFORE VEHICLE STOPS FROM RUNNING ................... 7A2-131
NO. G1: VEHICLE MOVES IN P RANGE OR PARKING GEAR IS NOT
DISENGAGED OTHER THAN P RANGE ..................................................................... 7A2-131
NO. G2: CREEP FORCE IS LARGE.............................................................................. 7A2-131
NO. G3: CREEP FORCE IS SMALL .............................................................................. 7A2-132
NO. G4: LARGE NOISE DURING IDLING WITH THE VEHICLE IN STOP STATE ...... 7A2-133
NO. H1: JUDDER OCCURS AT THE LOCK-UP ........................................................... 7A2-133
NO. H2: LARGE LOCK-UP SHOCK .............................................................................. 7A2-133
NO. H3: LOCK-UP POINT IS HIGH OR LOW ............................................................... 7A2-133
NO. I1: NO LOCK-UP .................................................................................................... 7A2-134
NO. J1: OIL LEAKS FROM BREATHER ....................................................................... 7A2-136
NO. J2: OIL LEAKS BETWEEN ENGINE AND CONVERTER HOUSING .................... 7A2-136
NO. J3: OIL LEAKS BETWEEN MAIN CASE AND CONVERTER HOUSING.............. 7A2-136
NO. J4: OIL LEAKS BETWEEN MAIN CASE AND REAR HOUSING .......................... 7A2-136
NO. J5: OIL LEAKS FROM OIL PAN ............................................................................ 7A2-136
NO. J6: OIL LEAKS FROM MANUAL SHAFT OIL SEAL ............................................. 7A2-136
NO. J7: OIL LEAKS FROM OIL COOLER PIPE JOINT................................................ 7A2-136
NO. Z1: TRANSMISSION OVERHEAT .......................................................................... 7A2-136
NO. Z2: MODE LAMP (POWER DRIVE OR 3RD START) DOES NOT LIGHT UP
WHEN THE POWER MODE OR 3RD START MODE IS TURNED ON........................ 7A2-137

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ISUZU TF SERIES 2004 Workshop Manual DIAGNOSIS (JR405E) 7A2-5
PAGE
NO. Z3: MODE LAMP (POWER DRIVE OR 3RD START) LIGHTS UP WHEN
THE POWER MODE OR 3RD START MODE IS TURNED OFF .................................. 7A2-137
NO. Z4: OIL T

DIAGNOSIS (JR405E) 7A2-5
PAGE
NO. Z3: MODE LAMP (POWER DRIVE OR 3RD START) LIGHTS UP WHEN
THE POWER MODE OR 3RD START MODE IS TURNED OFF .................................. 7A2-137
NO. Z4: OIL TEMPERATURE WARNING LAMP LIGHTS UP ...................................... 7A2-137
NO. Z5: SELECT LEVER FEELING IS FAULTY. .......................................................... 7A2-137
NO. Z6: POOR FUEL CONSUMPTION ......................................................................... 7A2-138
NO. Z7: PATTERN SELECT SWITCH IS FAULTY........................................................ 7A2-138
NO. Z8: OIL IS SPLASHED DURING THE RUNNING .................................................. 7A2-138
NO. Z9: ABNORMAL SMELL ........................................................................................ 7A2-138
NO. Z10: ATF QUANTITY IS LOW OR HIGH ................................................................ 7A2-138
NO. Z11: ABNORMAL OIL PRESSURE........................................................................ 7A2-139
NO. Z12: REVERSE BUZZER DOES NOT RING .......................................................... 7A2-139
STALL TEST .................................................................................................................. 7A2-140
LINE PRESSURE TEST................................................................................................. 7A2-141
TIME LAG TEST............................................................................................................. 7A2-143
TEST DRIVE................................................................................................................... 7A2-144
SHIFT POINT CHART .................................................................................................... 7A2-147
SHIFT POINT DIAGRAM................................................................................................ 7A2-149
TCM VOLTAGE CHECK ................................................................................................ 7A2-154

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ISUZU TF SERIES 2004 Workshop Manual 7A2-6 DIAGNOSIS (JR405E)
BASIC TROUBLE SHOOTING

Transmission fluid pressure together with clutch and brake friction and other important transmission functions are
controlled by electrical signal

Page 3999 of 4264

ISUZU TF SERIES 2004 Workshop Manual DIAGNOSIS (JR405E) 7A2-7
CHECK TRANS INDICATOR & SELF DIAGNOSIS

CHECK
TRANS

Warning to the driver
"CHECK TRANS" is ON during 3 seconds at key switch ON
position.
When trouble has o

Page 4000 of 4264

ISUZU TF SERIES 2004 Workshop Manual 7A2-8 DIAGNOSIS (JR405E)

Data Link Connector Short Circuit
Self-diagnosis code (Flash code) display
The stored trouble codes can be identified by shorting the
terminal No. 11 and No. 4 or

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