Isuzu Trooper (1998-2002 year). Manual - part 148

4B2–79

DRIVE LINE CONTROL SYSTEM (TOD)

Step

Action

Yes

No

1

1. Turn on the starter switch.

When the 4WD SW is selected to the 4WD position, is 0 V
observed between terminal 12 and 19?

Go to Step 2

Repair the 4WD

AUTO SW circuit.

Go to Step 4

2

When the 4WD AUTO SW is selected to the 2WD position, is 12 V
observed between terminals 12 and 19?

Go to Step 3

Repair the 4WD

AUTO SW circuit.

Go to Step 4

3

When the transfer lever is shifted to the 4L position, is battery
voltage observed between terminals 28 and 19?

The phenomenon

is not

reproduced.

Refer to

“Troubles

intermittently

observed”.

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)

4B2–80

Chart B–2

The 4WD AUTO switch circuit is short to battery.

Function of circuit

—

Fail condition

Even after the transfer mode is selected from 2H to TOD, the indicator lamp status dose

not change.

Indicator lamp status

Transfer position

TOD

D04RY00114

4B2–81

DRIVE LINE CONTROL SYSTEM (TOD)

D04RY00115

DRIVE LINE CONTROL SYSTEM (TOD)

4B2–82

Step

Action

Yes

No

1

When the 4WD AUTO SW is selected to the 4WD position, is 0 V
observed between terminal 12 and 19?

Go to Step 2

Repair the 4WD

AUTO SW circuit.

Go to Step 7

2

When the 4WD AUTO SW is selected to the 2WD position, is 12 V
observed between terminals 12 and 19?

Go to Step 3

Repair the 4WD

AUTO SW circuit.

Go to Step 7

3

1. Disconnect the ECU connector.

Is the continuity established between terminals (B–67)1 and
(B–68)13?

Go to Step 4

Replace TOD

indicator lamp

bulb.

Go to Step 7

4

Is the continuity established between terminals (B–67)1 and
(B–68)14?

Go to Step 5

Replace TOD

indicator lamp

bulb.

Go to Step 7

5

Is the continuity established between terminals (B–67)1 and
(B–68)15?

Go to Step 6

Replace TOD

indicator lamp

bulb.

Go to Step 7

6

Is the continuity established between terminals (B–67)1 and
(B–68)16?

Replace ECU.

Go to Step 7

Replace TOD

indicator lamp

bulb.

Go to Step 7

7

Check that all the parts are mounted.

Is this step complete?

Repeat the

“Diagnosis Flow”.

Return to Step 7