2004 ISUZU TF SERIES Workshop Manual

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Page 4113 of 4264

ISUZU TF SERIES 2004 Workshop Manual DIAGNOSIS (JR405E) 7A2-121
No. E1: No Gear Shift

Description:
Range is fixed without shifting the gear of 1st to 2nd, 2nd to 3rd, and 3rd to 4th.
Gear may be shifted or may not be shifted

Page 4114 of 4264

ISUZU TF SERIES 2004 Workshop Manual 7A2-122 DIAGNOSIS (JR405E)
Step Action Yes No
4 Inspection of inhibitor switch using a Tech 2 or circuit tester.
When the select lever is operated, is the data display in the Tech
2 correct or vol

Page 4115 of 4264

ISUZU TF SERIES 2004 Workshop Manual DIAGNOSIS (JR405E) 7A2-123
Step Action Yes No
6 Check of power supply to and earth of TCM.
Are the power supply and earth proper?

TCM
A1 (+B)
B

Page 4116 of 4264

ISUZU TF SERIES 2004 Workshop Manual 7A2-124 DIAGNOSIS (JR405E)
No. E2: Only 4th gear (O/D) is Not Selectable

Description:
Gear is not shifted up from 3rd to 4th though the vehicle is accelerated.

Possible Cause:
Disorder

Page 4117 of 4264

ISUZU TF SERIES 2004 Workshop Manual DIAGNOSIS (JR405E) 7A2-125
Step Action Yes No
5 Inspection of inhibitor switch using a Tech 2 or circuit tester.
When the select lever is operated, is the data display in the Tech
2 correct or vol

Page 4118 of 4264

ISUZU TF SERIES 2004 Workshop Manual 7A2-126 DIAGNOSIS (JR405E)
No. E3: Gear is Shifted 2nd to 3rd in 2 Range
No. E4: Gear is Shifted 1st to 2nd in L Range
No. E5: Gear is Shifted 3rd to 4th in 3 Range

Description:
Gear is shi

Page 4119 of 4264

ISUZU TF SERIES 2004 Workshop Manual DIAGNOSIS (JR405E) 7A2-127
No. F1: Low Maximum Speed or Poor Acceleration

Description:
Starting acceleration is poor.
Acceleration is slow though the accelerator pedal is stepped on durin

DIAGNOSIS (JR405E) 7A2-127
No. F1: Low Maximum Speed or Poor Acceleration

Description:
Starting acceleration is poor.
Acceleration is slow though the accelerator pedal is stepped on during the running.

Diagnosis Hints:
In addition to the low engine output, faulty gear shifting of AT or fixing at the 3rd position may be possible.
Therefore, in case of such a trouble that "maximum speed is low, and acceleration is poor", it should be cleared
up whether the trouble is originated from the engine system of AT system by a running test, inspection of stall
revolution, etc.

Possible Cause:
Clogged air cleaner, out of injection timing, dropped compression pressure, etc.
Fixing at 3rd position (fail-safe activated).
Since the gear is fixed at the 3rd position because of the fail-safe function, a trouble that "Maximum
speed is low, and acceleration is poor" is resulted. In this case, the DTC is memorized.
When TCM stops operation because of faulty TCM ground, the gear is fixed at the 3rd position because
of a mechanical reason. In this case, no DTC is memorized.
Disordered inhibitor switch .
Incorrect properties of throttle opening signal (serial communication) of throttle position sensor.
Throttle opening signal (serial communication) of the throttle position sensor does not change in
proportion to the throttle opening. In this case, fixing at the high or low gear results in such a trouble
that "Maximum Speed is Low and Acceleration is Poor".
Slip of clutch (low clutch, high clutch).
If slip of clutch is caused, a DTC (gear ratio error) is stored.
Dropped line pressure.
Trouble in the torque converter system (faulty operation).

Step Action Yes No
1 Test Drive.
Is the gear smoothly shifted in the order of 1st to 2nd, 2nd to 3rd,
3rd to 4th gear and lock up?
Clogged air
cleaner, out of
injection timing,
dropped
compression
pressure, etc. Go to Step 2
2 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 (2nd) to 3 range
(3rd) to D range (4th) (to detect the gear ratio trouble exactly, this
process should be carried out)
Go to Step 3 Go to Step 3
3 Are any DTCs stored?
Go to DTC Chart Go to Step 4

Page 4120 of 4264

ISUZU TF SERIES 2004 Workshop Manual 7A2-128 DIAGNOSIS (JR405E)
Step Action Yes No
4 Are the quantity, contamination and smell normal?
If the ATF level is
low, replenish up to
the specified level.

Go to Step 5
If ATF is extrem

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