Isuzu Trooper (1998-2002 year). Manual - part 155

4B2–107

DRIVE LINE CONTROL SYSTEM (TOD)

D04RY00071

DRIVE LINE CONTROL SYSTEM (TOD)

4B2–108

Step

Action

Yes

No

1

Start the engine.

When the transfer lever is shifted to the neutral position between
high and 4L, is 5V observed between terminals 10 and 19?

Go to Step 2

Go to Step 7

2

When the transfer lever is shifted to the high position and 4WD
AUTO SW is selected to the 4WD position, is 0V observed
between terminals 10 and 19?

Go to Step 3

Go to Step 7

3

When the transfer lever is shifted to the 4L position, is 0V
observed between terminals 10 and 19?

Go to Step 4

Go to Step 7

4

Select the 4WD AUTO SW to the 2WD position.

Is 12V observed between terminals 25 and 19?

Go to Step 5

Replace the

ECU.

Go to Step 19

5

Is 12V observed between terminals 26 and 19?

Go to Step 6

Replace the

ECU.

Go to Step 19

6

Is 12V observed between terminals 27 and 19?

The phenomenon

is not

reproduced.

Refer to

“Troubles

intermittently

observed”.

The ECU has

failed. Replace

the ECU.

Go to Step 19

7

When the 4WD AUTO SW is selected to the 2WD position, is the
battery voltage observed between terminals 5 and 19?

Go to Step 8

Go to Step 11

8

When the transfer lever is shifted to the neutral position between
high and 4L, is the battery voltage observed between terminals 5
and 19?

Go to Step 9

Go to Step 11

9

When the transfer lever is shifted to the high position and 4WD
AUTO SW is selected to the 4WD position, is 0V observed
between terminals (B–67)5 and (B–67)11?

Go to Step 10

Go to Step 11

10

When the transfer lever is shifted to the 4L position, is 0V
observed between terminals 5 and 19?

Go to Step 12

Go to Step 11

11

Is any of the trouble codes 28, 32 and 33 recorded?

Examine the

trouble based on

“Diagnosis from

Trouble Codes”.

The ECU has

failed. Replace

the ECU.

12

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

Does the resistance between terminals 5 and 19 meet the
standard, 17<  R < 25 ohm?

Go to Step 13

Repair the circuit

or replace the

VSV.

Go to Step 19

13

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

When the 4WD AUTO SW is selected to the 2WD position, is the
battery voltage supplied to each VSV?

Go to Step 14

Repair the circuit

or replace the

VSV.

Go to Step 19

14

When the transfer lever is shifted to the neutral position between
high and 4L, is the battery voltage supplied to each VSV?

Go to Step 15

Repair the circuit

or replace the

VSV.

Go to Step 19

15

When the transfer lever is shifted to the high position and 4WD
AUTO SW is selected to the 4WD position, is 0V observed on
each VSV?

Go to Step 16

Repair the circuit

or replace the

VSV.

Go to Step 19

4B2–109

DRIVE LINE CONTROL SYSTEM (TOD)

Step

No

Yes

Action

16

When the transfer lever is shifted to the 4L position, is 0V
observed on each VSV?

Go to Step 17

Repair the circuit

or replace the

VSV.

Go to Step 19

17

Is the vacuum pressure supplied to the VSV?

Go to Step 18

Repair the

vacuum system.

Go to Step 19

18

Can the single AXLE switch enable and disable the continuity?

Repair the shift

on the fly system

Refer to Section

4B1 and 4C.

Go to Step 19

Replace the

AXLE switch

Refer to Section

4B1 and 4C.

Go to Step 19

19

Check that all the parts are mounted.

Is this step complete?

Repeat the

“Diagnosis Flow”.

Return to Step 19

DRIVE LINE CONTROL SYSTEM (TOD)

4B2–110

Chart G

The trouble codes are displayed.

Function of circuit

—

Fail condition

Indicator lamp status

Transfer position

—