Isuzu Trooper (1998-2002 year). Service manual - part 152

4B2–95

DRIVE LINE CONTROL SYSTEM (TOD)

D04RY00065

DRIVE LINE CONTROL SYSTEM (TOD)

4B2–96

Step

Action

Yes

No

1

When the transfer lever is shifted to the high position, is 5V
observed between terminals 9 and 19 (4L switch)?

Go to Step 2

Go to Step 7

2

When the transfer lever is shifted to the neutral position, is 0V
observed between terminals 9 and 19 (4L switch)?

Go to Step 3

Go to Step 7

3

When the transfer lever is shifted to the 4L position, is 0V
observed between terminals 9 and 19 (4L switch)?

Go to Step 4

Go to Step 7

4

1. Shift the 4WD AUTO SW to the 2H position.

Is 12V observed between terminals 25 and 19?

Go to Step 5

The ECU has

failed. Replace

the ECU.

Go to Step 16

5

Is 12V observed between terminals 26 and 19?

Go to Step 6

The ECU has

failed. Replace

the ECU.

Go to Step 16

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 16

7

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

When the transfer lever is shifted to the neutral position between
High and 4L, is the continuity established between terminals
(B–68)4 and (B–67)11?

Go to Step 8

Go to Step 10

8

When the transfer lever is shifted to the 4L position, is the
continuity established between terminals (B–68)4 and (B–67)11?

Go to Step 9

Go to Step 10

9

When the transfer lever is shifted to the high position, is the
continuity established between terminals (B–68)4 and (B–67)11?

Go to Step 10

The ECU has

failed. Replace

the ECU.

Go to Step 16

10

1. Disconnect the H-49 connector.

When the transfer lever is shifted to the neutral position between
high and 4L, is the continuity established between terminals
(H-49)5 and (B-67)11?

Go to Step 11

Go to Step 13

11

When the transfer lever is shifted to the 4L position, is the
continuity established between transfer connector terminals
(H-49)5 and (B-67)11?

Go to Step 12

Go to Step 13

12

When the transfer lever is shifted to the high position, is the
continuity established between terminals (H-49)5 and (B-67)11?

Go to Step 13

GND is

short-circuited

between

terminals (B–68)4

and (H-49)5.

Repair the circuit.

Go to Step 16

13

1. Disconnect the A-3 connector.

When the transfer lever is shifted to the neutral position between
high and 4L, is the continuity established between terminals
(A-3)12 and GND?

Go to Step 14

Repair the

transfer

assembly.

Go to Step 16

14

When the transfer lever is shifted to the 4L position, is the
continuity established between terminals (A-3)12 and GND?

Go to Step 15

Repair the

transfer

assembly.

Go to Step 16

4B2–97

DRIVE LINE CONTROL SYSTEM (TOD)

Step

No

Yes

Action

15

When the transfer lever is shifted to the high position, is the
continuity established between terminals (A-3)12 and GND?

Repair the

transfer

assembly.

Go to Step 16

GND is

short-circuited

between

terminals (H–49)5

and (A-3)12.

Repair the circuit.

Go to Step 16

16

Check that all the parts are mounted.

Is this step complete?

Repeat the

“Diagnosis Flow”.

Return to Step 16

DRIVE LINE CONTROL SYSTEM (TOD)

4B2–98

Chart E–1

AXLE switch circuit wires are broken.

Function of circuit

—

Fail condition

Both the TOD and 4L modes are disabled. (The transition status is not removed.)

Indicator lamp status

Transfer position

TOD

4L

D04RY00068