Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Manual - part 641

DRIVE LINE CONTROL SYSTEM (TOD)

4B2–84

Step

Action

Yes

No

1

1. Disconnect ECU terminal.
2. Turn on the starter switch.

Is battery voltage observed between ECU terminals (B–48)18
and (B–48)24?

Go to Step 2

Wires are broken

lighting SW

circuit.  Repair

the circuit.

Go to Step 4

2

Turn lighting SW “ON”.

Is 0 V observed between ECU terminal (B–48)18 and (B–48)24?

Go to Step 3

Lighting SW

circuit battery

short.  Repair the

circuit.

Go to Step 4

3

Connect ECU terminal.

While the lighting switch is pressed on and off, does the
brightness of the indicator change?

The phenomenon

is not

reproduced.

Refer to

“Troubles

intermittently

observed”

The ECU has

failed.  Replace

the ECU.

Go to Step 4

4

Check that all the parts are mounted.

Is this step complete?

Repeat the

“Diagnosis Flow”.

Return to Step 4

4B2–85

DRIVE LINE CONTROL SYSTEM (TOD)

Diagnosis from Symptom

Troubles that are not indicated by the warning lamp are
listed in the table below.  These troubles are caused by
the faults that cannot be detected by the self-diagnostic
function of the control unit.
If this type of trouble is observed, interview the customer
and conduct test runs to reproduce the trouble,
cross-check the reported trouble with the listed
phenomena, and diagnose and analyze the trouble on the
item by item basis.

Phenomena

Major cause

Corrective action

1

The tight corner braking is ob-
served when the vehicle is subject
to full steering.

D

The standard tires are not used.

D

The tire pressure is incorrect.

D

The tires are worn inuniformity.

D

The transfer or wiring is
imperfect.

D

The limited slip differential is
failed.

Check and recondition the ve-
hicle according to Chart 1.

2

Even if the 4WD Auto Switch is se-
lect to the 4WD position, the 4WD
mode is not active, resulting in re-
markable rear wheel spin.

D

The transfer or wiring is
imperfect.

D

The shift on the fly system is
failed.

Check and recondition the ve-
hicle according to Chart 2.

3

D

When the 4WD Auto Switch is
select to the 4WD position, the
drive resistance of the 4WD
system is too large to get
sufficient running speed.

D

Noised drive line.

D

The standard tires are not used.

D

The tire pressure is incorrect.

D

The tires are worn inuniformity.

D

The transfer or wiring is
imperfect.

D

The limited slip differential is
failed. 

Check and recondition the ve-
hicle according to Chart 1.

4

The shift on the fly system (front
axle) generates gear noises.

D

The wiring is imperfect.

D

The shift on the fly system is
failed.

Check and recondition the ve-
hicle according to Chart 3.

5

The braking distance gets long
even when the ABS is active.

D

The wiring is imperfect.

D

The ABS is failed.

Check and recondition the ve-
hicle according to Chart 4.

DRIVE LINE CONTROL SYSTEM (TOD)

4B2–86

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.

D04RY00009

4B2–87

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

Inflate the tires to

recommended

pressure.

 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 and switch

the 4WD AUTO switch to the 4WD 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 high position and switch the 4WD

AUTO switch 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

Turn on the starter switch.

Is the battery voltage observed between terminals 33 and 46?

 Go to Step 13

Repair the circuit

of terminal 33

(ABS IN).

 Go to Step 16