2004 ISUZU TF SERIES Workshop Manual

bulb cabin filter maintenance schedule ABS fuel consumption dashboard warning lights

Page 4089 of 4264

ISUZU TF SERIES 2004 Workshop Manual DIAGNOSIS (JR405E) 7A2-97
No. B2: Poor Acceleration at Starting

Description:
Starting acceleration is poor.

Diagnosis Hints:
In addition to the low engine output, faulty gear shifting

DIAGNOSIS (JR405E) 7A2-97
No. B2: Poor Acceleration at Starting

Description:
Starting acceleration is poor.

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 4090 of 4264

ISUZU TF SERIES 2004 Workshop Manual 7A2-98 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 extre

Page 4091 of 4264

ISUZU TF SERIES 2004 Workshop Manual DIAGNOSIS (JR405E) 7A2-99
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 propor

Page 4092 of 4264

ISUZU TF SERIES 2004 Workshop Manual 7A2-100 DIAGNOSIS (JR405E)
No. B3: Engine Race Up During Starting (Slip)

Description:
The engine speeds up but vehicle speed does not increase when the accelerator pedal is stepped on at the

Page 4093 of 4264

ISUZU TF SERIES 2004 Workshop Manual DIAGNOSIS (JR405E) 7A2-101
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 4094 of 4264

ISUZU TF SERIES 2004 Workshop Manual 7A2-102 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 4095 of 4264

ISUZU TF SERIES 2004 Workshop Manual DIAGNOSIS (JR405E) 7A2-103
No. B4: Large Shock When Shift Lever is Changed to N to D
Range or N to R Range

Description:
Large shock is felt when selecting D or R range from N range during th

Page 4096 of 4264

ISUZU TF SERIES 2004 Workshop Manual 7A2-104 DIAGNOSIS (JR405E)
No. B5: Engine Stalls When Selecting From N Range to
R, D, 3, 2 or L Range

Description:
The engine stalls when selecting from N or P range to a run range during t

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