Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual — part 1880

7A2-136 DIAGNOSIS

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.

•

Monitor the signal to the lock-up solenoid while carrying out a running test.

•

When the output signal to the lock-up solenoid is correctly sent causing no lock-up, clogged lock-up solenoid oil

passage or malfunction of the lock-up piston may be considered.

•

Even the lock-up area, the output signal to the lock-up solenoid is not sent, fault of the ATF thermo sensor

controlling the lockup is considered. (Lock-up is not operated at ATF temperature less than 11

°C or more than

128

°

C.)

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

Possible Cause:

•

ATF thermo sensor detects low oil temperature (Lock-up is prohibited temperature less than 10

°

C.).

•

Clogged oil passage of lock-up duty solenoid.

•

Trouble in control valve body (faulty operation, sticking, clogged oil passage).

Step

Action

Yes

No

1

Are any DTCs stored?

Go to DTC Chart

Go to Step 2

2

Are the quantity, contamination and smell normal?

If the ATF level is

low, replenish up to

the specified level.

Go to Step 3

If ATF is extremely

black and

contaminated and

smells burnt, slip of

the clutch is

supposed.

Overhaul the AT

unit.

DIAGNOSIS 7A2-137

Step

Action

Yes

No

3

Inspection of electrical or mechanical fault
When the ATF oil temperature is above 20

°

C and the vehicle

speed is 80km/h, is ON signal issued to the lock-up solenoid
using the Tech 2 or circuit tester?

Control Valve

TCM

B17

B23

BLK

Lock-up Solenoid

Terminal

Assembly

VIO

Line Pressure Solenoid

E54

(4)

(6)

H23

(14)

(6)

C95

(17)

(23)

BLK

VIO

TCM terminal

Lock-up

B17

At lock-up

Approx. 7.2 V (AC range)

At unlock-up

Approx. 4.0 V (AC range)

Clogged oil

passage of lock-up

solenoid or faulty

operation of lock-

up piston.

Go to Step 4

4

Inspection of ATF oil thermo sensor.
Is the ATF oil temperature sensor terminal voltage correct?
After running using the Tech 2 data display function, is the ATF
temperature higher than 10

°

C?

ATF

Temp.

Sensor

TCM

B4 (+)

B14 (-)

H23

(8)

(3)

C95

(4)

(14)

BLU

Terminal

Assembly

BLU/BLK

E54

(2)

(8)

BLU

BLU/BLK

T C M te r m in a l

Te m p e r a tu r e

B 4

( O u tp u t v o lta g e )

2 0

1 .5 5

4 0

1 .0 8

6 0

0 .7

Monitor the electric

system input

sensor signal and

find a signal

causing no lockup.

Repair the defect or

replace.

7A2-138 DIAGNOSIS

No. J1: Oil Leaks from Breather

Description:

•

Oil leaks from breather.

Possible Cause:

•

ATF quantity is excessively.

No. J2: Oil Leaks Between Engine and Converter Housing
No. J3: Oil Leaks Between Main Case and Converter Housing
No. J4: Oil Leaks Between Main Case and Rear Housing
No. J5: Oil Leaks from Oil Pan
No. J6: Oil Leaks from Manual Shaft Oil Seal
No. J7: Oil Leaks from Oil Cooler Pipe Joint

Description:

•

Oil leaks between engine and converter housing.

•

Oil leaks between converter housing and main case.

•

Oil leaks between main case and rear housing.

•

Oil leaks from oil pan.

•

Oil leaks from manual shaft oil seal.

•

Oil leaks from oil cooler pipe joint.

Possible Cause:

•

Faulty oil seal or sealing of contact surface is considered.

No. Z1: Transmission Overheat

Description:

•

You smell the transmission burning.

•

The transmission smokes.

Possible Cause:

•

Slip

of

clutch.

If slip of clutch is caused, a DTC (gear ratio error) is stored.

•

Clogged oil cooler (foreign substance mixed)

•

ATF stirred excessively (too much ATF).

•

Faulty torque converter operating pressure.

•

Faulty lock-up piston.

DIAGNOSIS 7A2-139

No. Z2: Mode Lamp (Power Drive or 3rd Start) Does Not Light Up

When The Power Mode or 3rd Start Mode is Turned On

Description:

•

The mode lamp on the instrument panel does not light up though the power mode or 3rd start mode is turned on

with the ignition switch in ON position.

Possible Cause:

•

Faulty mode select switch is considered.

•

Bulb burn out.

No. Z3: Mode Lamp (Power Drive or 3rd Start) Lights Up When

The Power Mode or 3rd Start Mode is Turned Off

Description:

•

The mode lamp on the instrument panel lights up though the power mode or 3rd start mode is turned off with the

ignition switch in ON position.

Possible Cause:

•

Faulty mode select switch is considered.

No. Z4: Oil Temperature Warning Lamp Lights up

Description:

•

Sometimes, the oil temperature warning lamp lights up.

Possible Cause:

•

When the vehicle is stuck in the mud or continues to accelerate under overload, and ATF temperature exceeds

145

°

C, the oil temperature warning lamp lights up.

•

If the oil temperature warning lamp lights up under usual service condition, following causes are considered.

•

ATF level has increased for some fault.

Refer to "No. Z1: Transmission overheat".

•

Lights up due to error of the ATF oil thermo sensor.

No. Z5: Select Lever Feeling is Faulty.

Description:

•

Select lever feeling is faulty.

Possible Cause:

•

Disordered select cable.

•

Disordered select lever.

•

Faulty Manual plate.