Isuzu Trooper (2000 year). Manual - part 112

DRIVE LINE CONTROL SYSTEM (TOD)

4B2–68

Step

Action

Yes

No

1

Turn on the starter switch.

When the transfer lever is shifted to the high position, is 5V
observed between terminals 44 and 46 (4L switch)?

Go to Step 2

Go to Step 4

2

When the transfer lever is shifted to the neutral position, is 0V
observed between terminals 44 and 46 (4L switch)?

Go to Step 3

Go to Step 4

3

When the transfer lever is shifted to the 4L position, is 0V
observed between terminals 44 and 46 (4L switch)?

The ECU has

failed. Replace

the ECU.

Go to Step 4

Go to Step 4

4

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

When the transfer lever is shifted to the high position, is 12V
observed between terminals (B–48)22 and (B–48)24 (4L switch)?

Go to Step 5

Go to Step 7

5

When the transfer lever is shifted to the neutral position, is 0V
observed between terminals (B–48)22 and (B–48)24 (4L switch)?

Go to Step 6

Go to Step 7

6

When the transfer lever is shifted to the 4L position, is 0V
observed between terminals (B–48)22 and (B–48)24 (4L switch)?

The 4L switch

circuit battery is

short-circuited

between ECU

and transfer.

Repair the circuit

Go to Step 13

Go to Step 7

7

Turn off the starter switch.

When the transfer lever is shifted to the high position, is the
continuity established between terminals (B–48)22 and (B–48)24
(4L switch)?

Go to Step 10

Go to Step 8

8

When the transfer lever is shifted to the neutral position between
high and 4L, is the continuity established between terminals
(B–48)22 and (B–48)24 (4L switch)?

Go to Step 9

Go to Step 10

9

When the transfer lever is shifted to the 4L position, is the
continuity established between terminals (B–48)22 and (B–48)24
(4L switch)?

The phenomenon

is not

reproduced.

Refer to

“Troubles

intermittently

observed”.

Go to Step 13

Go to Step 10

10

1. Disconnect the M–27 connector.

When the transfer lever is shifted to the neutral position between
high and 4L, is the continuity established between transfer
connector terminals (M-27)12 and GND?

Wires are broken

between transfer

connector (M-27)

and floor

connector (H-17).
Repair the circuit.

Go to Step 11

Repair the

transfer

assembly.

Go to Step 13

11

When the transfer lever is shifted to the 4L position, is the
continuity established between transfer connector terminals
(M-27)12 and GND?

Go to Step 12

Repair the

transfer

assembly.

Go to Step 13

4B2–69

DRIVE LINE CONTROL SYSTEM (TOD)

Step

No

Yes

Action

12

When the transfer lever is shifted to the high position, is the
continuity established between transfer connector terminals
(M-27)12 and GND?

Repair the

transfer

assembly.

Go to Step 13

Go to Step 13

13

Check that all the parts are mounted.

Is this step complete?

Repeat the

“Diagnosis Flow”.

Return to Step 13

DRIVE LINE CONTROL SYSTEM (TOD)

4B2–70

Chart D–2

The 4L switch circuit is short-circuited to GND.

Function of circuit

—

Fail condition

The 4L mode is displayed even in the 2H or TOD.

Indicator lamp status

Transfer position

2H or TOD

D04RY00006

4B2–71

DRIVE LINE CONTROL SYSTEM (TOD)

Step

Action

Yes

No

1

When the transfer lever is shifted to the high position, is 5V
observed between terminals 44 and 46 (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 44 and 46 (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 44 and 46 (4L switch)?

Go to Step 4

Go to Step 7

4

1. Select the 4WD Auto Switch to the 2H position.

Is 12V observed between terminals 17 and 46?

Go to Step 5

The ECU has

failed. Replace

the ECU.

Go to Step 16

5

Is 12V observed between terminals 6 and 46?

Go to Step 6

The ECU has

failed. Replace

the ECU.

Go to Step 16

6

Is 12V observed between terminals 18 and 46?

The phenomenon

is not

reproduced.

Refer to

“Troubles

intermittently

observed”.

Go to Step 16

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–48)22 and (B–48)24?

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–48)22 and
(B–48)24?

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–48)22 and
(B–48)24?

Go to Step 10

The ECU has

failed. Replace

the ECU.

Go to Step 16

10

1. Disconnect the M-17 connector.

When the transfer lever is shifted to the neutral position between
high and 4L, is the continuity established between terminals
(H-17)6 and (B-48)24?

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-17)6 and (B-48)24?

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-17)6 and (B-48)24?

Go to Step 13

GND is

short-circuited

between

terminals

(B–48)22 and

(H-17)6. Repair

the circuit.

Go to Step 16

13

1. Disconnect the M-27 connector.

When the transfer lever is shifted to the neutral position between
high and 4L, is the continuity established between terminals
(M-27)12 and GND?

Go to Step 14

Repair the

transfer

assembly.

Go to Step 16