2004 ISUZU TF SERIES Workshop Manual

fuse box cooling wiper size height adjustment ground clearance change time

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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

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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

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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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