2004 ISUZU TF SERIES Workshop Manual

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Page 4121 of 4264

ISUZU TF SERIES 2004 Workshop Manual DIAGNOSIS (JR405E) 7A2-129
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 prop

Page 4122 of 4264

ISUZU TF SERIES 2004 Workshop Manual 7A2-130 DIAGNOSIS (JR405E)
No. F2: Engine Races Up During Acceleration (Slip)

Description:
The engine speed up when the accelerator pedal is stepped on for acceleration and the gear is shifte

Page 4123 of 4264

ISUZU TF SERIES 2004 Workshop Manual DIAGNOSIS (JR405E) 7A2-131
No. F5: Engine Stalls Before Vehicle Stops from Running

Description:
The engine stalls simultaneously with the vehicle stop when the brake pedal is stepped on to st

Page 4124 of 4264

ISUZU TF SERIES 2004 Workshop Manual 7A2-132 DIAGNOSIS (JR405E)
No. G3: Creep Force is small

Description:
Vehicle does not move though a run range is selected on a flat road during the idling.

Diagnosis Hints:
When the cre

7A2-132 DIAGNOSIS (JR405E)
No. G3: Creep Force is small

Description:
Vehicle does not move though a run range is selected on a flat road during the idling.

Diagnosis Hints:
When the creep force is small in all ranges, low engine output is considered. Another possible cause is slip of
clutch. If the creep is normal only in the R range, operation of the fail-safe function due to a trouble in the electrical
system is considered.

Possible Cause:
Slip of clutch (low clutch).
If slip of clutch is caused, a DTC (gear ratio error) is stored.
Low engine output (low idling speed, out of injection timing, lowered compression pressure, etc.).
Shortage or faulty quality of ATF.
Disconnection or short circuit of solenoid valve output.
Clogged oil passage of solenoid valve output.
Faulty ground return line in AT assembly.
If the ground return line earth is faulty, clutch pressure may decrease causing slip of the clutch.
Trouble in the torque converter system (faulty operation).

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
(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 2 Go to Step 2
2 Are any DTCs stored?
Go to DTC Chart Go to Step 3
3 Are the quantity, contamination and smell normal? If the ATF level is low,
replenish up to the
specified level.

Go to Step 4
If ATF is extremely
black and
contaminated and
smells burnt, slip of the
clutch is supposed.
Overhaul the AT unit.
4 Are the idling speed and other engine system normal?
Go to Step 5
Repair the defect or
replace.
5 Is the stall revolution normal in D, 3, 2 and L range? Refer
the STALL TEST section in this manual.
Go to Step 6
Repair the defect or
replace.
6 Is the line pressure normal? Refer the LINE PRESSURE
TEST section in this manual. Trouble in the AT
assembly or control
valve.
Repair the defect or
replace.

Page 4125 of 4264

ISUZU TF SERIES 2004 Workshop Manual DIAGNOSIS (JR405E) 7A2-133
No. G4: Large Noise During Idling with the Vehicle in Stop State

Description:
The transmission is noisy during the idling speed in all ranges.

Diagnosis Hints:

DIAGNOSIS (JR405E) 7A2-133
No. G4: Large Noise During Idling with the Vehicle in Stop State

Description:
The transmission is noisy during the idling speed in all ranges.

Diagnosis Hints:
Causes such as solenoid operating sound or faulty oil pump are considered.
Distinguishing to some extent is possible by stopping the solenoid operation temporarily, checking the correlation
for the former case and, changing the line pressure and confirming the correlation with noise.
As a matter of course, noise may be generated around the engine, for instance, other than the AT and should be
checked carefully.
Note:
When the noise is generated only at the time of gear shift, it may be the sound of flowing ATF or gear
noise. If the sound varies depending on the gear speed to be shifted, it may be the gear noise generated
from the planetary gear and its related components. If the sound varies depending on the vehicle
speed, it may be the gear noise of the output system, and if varying depending on the engine speed, it
may be the gear noise of the input system or faulty torque converter.
In either case, sound may be "noise" depending on the origin and resonance object. When the object
generating the sound (resonance object) and the sound source (vibration source) are different,
investigation of the cause may be difficult.

No. H1: Judder Occurs at the Lock-up

Diagnosis Hints:
The vehicle body judders at lock-up.

Diagnosis Hints:
Slip due to burning of the lockup piston or insufficient fastening due to dropped working pressure are considered.
Trouble diagnosis flow is basically the same as "No. I1: No lock-up".
Note:
When the lock-up piston has burnt, foreign material mixed in the oil cooler is considered. In such a
case, inspect the oil cooler circuit for clogging of the oil cooler.

No. H2: Large Lock-up Shock
No. H3: Lock-up Point is High or Low

Description:
Large shock is felt at lock-up.
Lock-up point is excessive high or low.

Diagnosis Hints:
Out of properties of input sensor or faulty lock-up piston pressure system are considered.
Trouble diagnosis flow is basically the same as "No. I1: No lock-up".

Page 4126 of 4264

ISUZU TF SERIES 2004 Workshop Manual 7A2-134 DIAGNOSIS (JR405E)
No. I1: No Lock-up

Description:
Lockup is not performed in spite of the lock-up area.

Diagnosis:
Lockup is not performed in spite of the lock-up area.
Mo

Page 4127 of 4264

ISUZU TF SERIES 2004 Workshop Manual DIAGNOSIS (JR405E) 7A2-135
Step Action Yes No
3 Inspection of electrical or mechanical fault
When the ATF oil temperature is above 20C and the vehicle
speed is 80km/h, is ON signal issued to the

Page 4128 of 4264

ISUZU TF SERIES 2004 Workshop Manual 7A2-136 DIAGNOSIS (JR405E)
No. J1: Oil Leaks from Breather

Description:
Oil leaks from breather.

Possible Cause:
ATF quantity is excessively.

No. J2: Oil Leaks Between Engine

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