Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual — part 1881

7A2-140 DIAGNOSIS

No. Z6: Poor Fuel Consumption

Description:

•

Poor

fuel

consumption.

Diagnosis Hints:

•

Basically same causes as "No. C1 - C8: Engine races up (slip) by shift up or shift down" are considered.

No. Z7: Pattern Select Switch is Faulty

Description:

•

Shift pattern does not change though the pattern select switch is turned on.

Possible Cause:

•

Faulty mode select switch is considered.

No. Z8: Oil is Splashed During the Running

Description:

•

Oil is splashed during the running

Possible Cause:

•

ATF quantity is too high.

No. Z9: Abnormal Smell

Description:

•

Abnormal

smell.

Diagnosis Hints:

•

Basically a trouble in the AT main unit.

No. Z10: ATF Quantity is Low or High

Description:

•

Oil quantity is low or high.

Possible Cause:

•

In case of oil level is high.

ATF temperature is low when ATF quantity is checked.

•

In case of oil level is low.

ATF leaks is considered. Check the AT main unit and cooler circuit.

DIAGNOSIS 7A2-141

No. Z11: Abnormal Oil Pressure

Description:

•

Oil pressure is low or high.

Possible Cause:

•

Basically, the same cause as "No. C1 - C8: Engine races up (slip) by shift up or shift down" is considered.

•

In case of oil pressure is low, faulty oil pump is considered.

No. Z12: Reverse Buzzer Does Not Ring

Description:

•

Reverse buzzer does not ring in R range.

Possible Cause:

•

Disordered select cable.

•

Disordered select lever.

•

Disordered inhibitor switch.

DIAGNOSIS 7A2-142

STALL TEST

CAUTION:

Because A/T may break down, do not perform the stall test continuously.

Procedure

1.

Chock the four wheels.

2.

Warm up the engine.

3.

Apply the parking brake.

4.

Step on the foot brake fully.

5.

Set the select lever to either D, 3, 2, L or R range.

6.

Step on the accelerator pedal fully.

7.

When the engine speed becomes constant, record that

value quickly.

Stall Speed

Standard: 2600±150 rpm

Evaluation

1.

If the stall speed is higher than standard value in all

ranges.

•

Low line pressure.

•

Abraded oil pump.

•

Faulty operation of low clutch.

•

Adjustment error of or faulty inhibitor switch.

•

ATF leaking from oil pump, control valve, or

transmission case.

•

Fixed pressure regulator valve and pilot valve.

2.

If the stall speed is higher than standard value in D, 3, 2

and L ranges.

•

Slip of low clutch.

•

Slip of low one-way clutch.

3.

If the stall speed is higher than standard value in R

range.

•

Slip of low & reverse brake.

•

Slip of reverse clutch.

4.

If the stall speed is lower than standard value in all

ranges.

•

Slip of one-way clutch (in torque converter).

•

Faulty engine.

DIAGNOSIS 7A2-143

LINE PRESSURE TEST

Procedure

1.

Chock the four wheels.

2.

Remove the test plug of the transmission case and fit the oil

pressure gauge.

3.

Warm up the engine.

4.

Apply the parking brake.

5.

Step on the foot brake fully.

6.Set the select lever to either D, 3, 2, L or R range.

7.

Record the oil pressure at idling.

8.

When stepping over the accelerator pedal fully and the

engine speed becomes constant, record the oil pressure

quickly.

Line Pressure

Standard:

Engine

Line Pressure (Kpa)

Speed

D, 3, 2 or L Range

R Range

Idling

350 - 480

450 - 650

Stall

1,050 - 1,250

1.400 - 1,630

Evaluation

1.

If the line pressure is lower than standard value at

idling in all ranges.

•

Abraded oil pump.

•

Faulty operation of each solenoid.

•

Sticking of pressure regulator valve or pilot valve.

•

Fatigued pressure regulator valve or pilot valve spring.

•

ATF leaking from oil strainer, oil pump, pressure

regulator valve, torque converter relief valve or pressure

relief valve.

2.

If the line pressure is lower than standard value at

idling in D, 3, 2 and L ranges.

•

ATF leaking from low clutch hydraulic circuit.

3.

If the line pressure is lower than standard value at

idling in R range.

•

ATF leaking from reverse hydraulic circuit.

•

ATF leaking from low and reverse brake hydraulic

circuit.