Isuzu Trooper (2000 year). Service manual — part 116

DRIVE LINE CONTROL SYSTEM (TOD)

4B2–84

Chart 1

The tight corner braking is observed.

Function of circuit

—

Fail condition

When the vehicle is subject to full steering in the TOD mode, the drive resistance gets

large or the judder occurs. Otherwise, the above phenomenon is observed only when the

brake is applied.

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4B2–85

DRIVE LINE CONTROL SYSTEM (TOD)

Step

Action

Yes

No

1

Are the front and rear tires in specified size?

Go to Step 2

Replace the tires

with specified

ones, and service

the new tires.

Go to Step 16

2

Is the tire pressure correct?

Go to Step 3

Replace the tires

with specified

ones, and service

the new tires.

Go to Step 16

3

Are the tires free from abnormal wear?

Go to Step 4

Replace the tires

with specified

ones, and service

the new tires.

Go to Step 16

4

Are different types of tires used?

Go to Step 5

Replace the tires

with specified

ones, and service

the new tires.

Go to Step 16

5

1. Start the engine.
2. Shift the transfer lever to the high (TOD) position.
3. Fully turn the steering to the left (or right) end, and select the D

range and start the creep run.

Does the tight corner braking occur? Is the judder with chug-chug
sound observed? * Use caution on the operation.

Go to Step 6

Go to Step 11

6

1. Shift the transfer lever to the 2H position.
2. Fully turn the steering to the left (or right) end, and select the D

range and start the creep run.

Does the tight corner braking occur? Is the judder with chug-chug
sound observed? * Use caution on the operation.

Go to Step 7

Go to Step 14

7

Is an LSD mounted to the rear differential?

Go to Step 8

Go to Step 9

8

Is the genuine LSD oil used in the rear differential?

Go to Step 9

Replace the

differential oil.

Go to Step 16

9

Does the engine output the power correctly?

Go to Step 10

Check the

engine.

Go to Step 16

10

Do the speed sensors work correctly? (Check trouble codes.)

The ECU has

failed. Replace

the ECU.

Go to Step 16

Replace the

speed sensors.

Go to Step 16

11

Is the tight corner braking observed only when the brake is
applied?

Go to Step 12

Conduct full

steering under

WOT.

Go to Step 5

12

1. Turn off the starter switch.
2. Disconnect the ECU connector.

Is the battery voltage observed between terminals (B–48)11 and
(B–48)24?

Go to Step 13

Repair the circuit

of terminal 6

(ABS IN).

Go to Step 16

DRIVE LINE CONTROL SYSTEM (TOD)

4B2–86

Step

No

Yes

Action

13

1. Apply the brake and fully turn the steering to the left (or right)

end, and start the creep run.

Does the voltage between terminals (B–49)11 and (B–49)22
range between 0.1 and 1.0V?

Repair the

transfer

assembly.

Go to Step 16

The ECU has

failed. Replace

the ECU.

Go to Step 16

14

1. Shift the transfer lever to the high (TOD) position.
2. Fully turn the steering to the left (or right) end, and select the D

range and start the creep run.

Does the voltage between terminals 11 and 22 range between 0.1
and 1.0V?

Go to Step 15

Go to Step 13

15

1. Select the 4WD Auto Switch to the 2WD position.
2. Jack up the right front wheel.

Does the front tire rotate smoothly?

Repair the

transfer

assembly.

Go to Step 16

The phenomenon

is not

reproduced.

Refer to

“Troubles

intermittently

observed”.

Go to Step 16

16

Check that all the parts are mounted.

Is this step complete?

Repeat the

“Diagnosis Flow”.

Return to Step 16

*NOTE: Before checking this item, run the vehicle more
than 10 meters with the steering wheel in straight position
so that the 4L mechanical lock sleeve can be released
certainly.

4B2–87

DRIVE LINE CONTROL SYSTEM (TOD)

Chart 2

The 4WD mode is not active.

Function of circuit

—

Fail condition

The rear wheels spin in the TOD mode, so the driving torque is not transmitted to the

front wheels. The indicator lamps will not show the 4L and TOD status.

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