Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Manual - part 637

DRIVE LINE CONTROL SYSTEM (TOD)

4B2–68

Step

No

Yes

Action

14

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

When the transfer lever is shifted to the neutral position, is the
continuity established between terminals (B–48)9 and (B–48)24
(4H switch)?

Go to Step 15

Go to Step 17

15

When the transfer lever is shifted to the high position, is the
continuity established between terminals (B–48)9 and (B–48)24?

Go to Step 17

Go to Step 16

16

When the transfer lever is shifted to the 4L position, is the
continuity established between terminals (B–48)9 and (B–48)24?

Go to Step 17

The ECU has

failed. Replace

the ECU.

Go to Step 23

17

1. Disconnect the H–17 connector.

When the transfer lever is shifted to the neutral position between
high and 4L, is the continuity established between terminals
(H-17)3 and (B-49)22?

Go to Step 18

Go to Step 20

18

When the transfer lever is shifted to the high position, is the
continuity established between transfer connector terminals
(H-17)3 and (B-49)22?

Go to Step 21

Go to Step 19

19

When the transfer lever is shifted to the 4L position, is the
continuity established between transfer connector terminals
(H-17)3 and (B-49)22?

Go to Step 22

GND is

short-circuited

between

terminals

(B-49)22 and

(H-17)3. Repair

the circuit.

Go to Step 23

20

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)4 and (M-27)7?

Go to Step 21

Repair the

transfer

assembly.

Go to Step 23

21

1. Disconnect the M–27 connector.

When the transfer lever is shifted to the high position, is the
continuity established between terminals (M-27)4 and (M-27)7?

Repair the

transfer

assembly.

Go to Step 23

Go to Step 22

22

1. Disconnect the M–27 connector.

When the transfer lever is shifted to the 4L position, is the
continuity established between terminals (M-27)4 and (M-27)7?

Repair the

transfer

assembly.

Go to Step 23

GND is

short-circuited

between

terminals (B-48)9

and (M–27)4.

Repair the circuit.

Go to Step 23

23

Check that all the parts are mounted.

Is this step complete?

Repeat the

“Diagnosis Flow”.

Return to Step 23

4B2–69

DRIVE LINE CONTROL SYSTEM (TOD)

Chart D–1

4L switch circuit wires are broken or the battery is short-circuited.

Function of circuit

—

Fail condition

The TOD mode is displayed in the neutral position between high and 4L. When the lever

is shifted to the 4L position, the TOD mode is displayed.

Indicator lamp status

Transfer lever position

4L

Middle between 4L

and High

4WD Auto Switch

D04RY00004

DRIVE LINE CONTROL SYSTEM (TOD)

4B2–70

Step

Action

Yes

No

1

Turn on the starter switch.

When the transfer lever is shifted to the high position, is 12V
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 middle position between
4L and High, 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 13

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 middle position between
4L and High, 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 12

Go to Step 8

8

When the transfer lever is shifted to the middle 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 11

10

1. Disconnect the M–27 connector.

When the transfer lever is shifted to the middle 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)12 and

connector

(B-48)22. Repair

the circuit.

Go to Step 13

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?

Wire are broken

between transfer

connector

(M-27)12 and

(B-48)22. Repair

the circuit.

Go to Step 13

Repair the

transfer

assembly.

Go to Step 13

4B2–71

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

Wires are broken

between transfer

connector

(M-27)12 and

connector

(B-48)22. Repair

the circuit.

Go to Step 13

13

Check that all the parts are mounted.

Is this step complete?

Repeat the

“Diagnosis Flow”.

Return to Step 13