Isuzu Trooper (1998-2002 year). Manual - part 156

4B2–111

DRIVE LINE CONTROL SYSTEM (TOD)

D04RY00072

Step

Action

Yes

No

1

Disconnect the ECU connector from ECU.

Is the continuity established between terminals (B–68)8 and
(B–67)11?

Go to Step 2

The ECU has

failed. Replace

the ECU.

 Go to Step 3

2

Is the self-diagnostic connector short-circuited?

Go to Step 3

Repair the

self-diagnostic

connector circuit.

 Go to Step 3

3

1. Check that all the parts are mounted.
2. Clear the trouble codes.

Is this step complete?

Repeat the

“Diagnosis Flow”.

Return to Step 3

DRIVE LINE CONTROL SYSTEM (TOD)

4B2–112

Chart H

lighting switch circuit

Function of circuit

Reads in the status of lighting switch and reduces the indicator brightness at night.

Fail condition

Even if the lighting switch is pressed on and off, brightness does not change.

Indicator lamp status

Transfer position

All position (example TOD mode)

D04RY00073

4B2–113

DRIVE LINE CONTROL SYSTEM (TOD)

Step

Action

Yes

No

1

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

Is battery voltage observed between ECU terminals (B–68)1 and
(B–67)11?

Go to Step 2

Wirers 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–68)1 and (B–67)11?

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

DRIVE LINE CONTROL SYSTEM (TOD)

4B2–114

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
observed 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
vehicle according to Chart 1.

2

Even if the 4WD AUTO SW is
select to the 4WD position, the
4WD mode is not active, resulting
in remarkable rear wheel spin.

D

The transfer or wiring is
imperfect.

D

The shift on the fly system is
failed.

Check and recondition the
vehicle according to Chart 2.

3

D

When the 4WD AUTO SW is
selected 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
vehicle 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
vehicle 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
vehicle according to Chart 4.