2004 ISUZU TF SERIES Workshop Manual

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Page 4097 of 4264

ISUZU TF SERIES 2004 Workshop Manual DIAGNOSIS (JR405E) 7A2-105
Step Action Yes No
5 Inspection of electrical or mechanical fault
When the D range is selected from D at idling speed, is the signal
to the lock-up solenoid turned off

Page 4098 of 4264

ISUZU TF SERIES 2004 Workshop Manual 7A2-106 DIAGNOSIS (JR405E)
No. B6: Engine Starter Does Not Run in P or N Range
No. B7: Engine Starter Runs Except in P or N Range

Description:
The engine starter does not run though the P or

Page 4099 of 4264

ISUZU TF SERIES 2004 Workshop Manual DIAGNOSIS (JR405E) 7A2-107
No. B10: Brake is Applied in R Range

Description:
Brake is applied suddenly in R range.

Diagnosis Hints:
Basically a trouble in the AT main unit. However, s

DIAGNOSIS (JR405E) 7A2-107
No. B10: Brake is Applied in R Range

Description:
Brake is applied suddenly in R range.

Diagnosis Hints:
Basically a trouble in the AT main unit. However, some trouble in the sensor system or output system may have
some influence on the trouble in the main unit and therefore these systems should be also checked to prevent
reproduce of the trouble.

Possible Cause:
Seized clutch (low clutch, high clutch, 2-4 brake).
Shortage or faulty quality of ATF.
Trouble in control valve body (faulty operation, sticking, clogged oil passage).
Disordered select cable (select indicator light indicates R but the hydraulic system is not in the R range).
Malfunction of parking mechanism.

No. B11: Insufficient Starting or Shaking in D Range

Description:
Insufficient starting or shaking in D range.

Possible Cause:
Slip of clutch (low clutch, low one-way clutch, reverse clutch, low & reverse brake).
If slip of clutch is caused, a DTC (gear ratio error) is stored.
Shortage or faulty quality of ATF.
Dropped line pressure.
Trouble in control valve body (faulty operation, sticking, clogged oil passage).

No. B12: Noise or Vibration is Generated at Starting

Description:
Noise or vibration is generated in the vicinity of AT at starting.

Diagnosis Hints:
Cause other than AT can be also considered. It is effective means to reproduce a running condition using a lift
up, chassis dynamo, etc. to investigate the origin (generating condition) of noise and vibration.
Caution:
Lifting up some unit to test it accompanies danger. Provide safety measures as far as possible and
carry out the test with sufficient care.

Possible Cause:
Following sources of noise or vibration other than the AT can be considered.
Noise from differential gears.
Noise from propeller shaft.
The bearing support in the middle of the propeller shaft has fatigued, and the bend angle of the propeller shaft
has changed, causing vibration at the time of start.
Unbalanced and poor uniformity of tires cause vibration.

Page 4100 of 4264

ISUZU TF SERIES 2004 Workshop Manual 7A2-108 DIAGNOSIS (JR405E)
No. C1: Engine Race Up (Slip) When Gear is Shifted Up to 1st to
2nd
No. C2: Engine Race Up (Slip) When Gear is Shifted Up to 2nd to
3rd
No. C3: Engine Race Up (slip) W

Page 4101 of 4264

ISUZU TF SERIES 2004 Workshop Manual DIAGNOSIS (JR405E) 7A2-109
Step Action Yes No
1 Gear ratio trouble diagnosis.
Travel in the following sequence for about 7 seconds or more in
each range: Start in the L range (1st) to 2 range (2

Page 4102 of 4264

ISUZU TF SERIES 2004 Workshop Manual 7A2-110 DIAGNOSIS (JR405E)
Step Action Yes No
6 Inspect the output voltage and throttle opening signal of the
throttle position sensor using a Tech 2 or circuit tester.
Is a voltage value in propo

Page 4103 of 4264

ISUZU TF SERIES 2004 Workshop Manual DIAGNOSIS (JR405E) 7A2-111
No. C9: Barking Feel When Gear is Shifted Up to 1st to 2nd
No. C10: Barking Feel When Gear is Shifted Up to 2nd to 3rd
No. C11: Barking Feel When Gear is Shifted Up to 3

Page 4104 of 4264

ISUZU TF SERIES 2004 Workshop Manual 7A2-112 DIAGNOSIS (JR405E)
Step Action Yes No
1
Gear ratio trouble diagnosis.
Travel in the following sequence for about 7 seconds or more in
each range: Start in the L range (1st) to 2 range (

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