Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Manual - part 638

DRIVE LINE CONTROL SYSTEM (TOD)

4B2–72

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 lever position

High (2H or TOD)

4WD Auto Switch

D04RY00006

4B2–73

DRIVE LINE CONTROL SYSTEM (TOD)

Step

Action

Yes

No

1

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 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”.

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 middle 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 11

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 12

The ECU has

failed. Replace

the ECU.

Go to Step 16

10

1. Disconnect the H-17 connector.

When the transfer lever is shifted to the middle 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 14

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 15

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 middle 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

DRIVE LINE CONTROL SYSTEM (TOD)

4B2–74

Step

No

Yes

Action

14

1. Disconnect the M-27 connector.

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

Go to Step 15

Repair the

transfer

assembly.

Go to Step 16

15

1. Disconnect the M-27 connector.

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

Repair the

transfer

assembly.

Go to Step 16

GND is

short-circuited

between

terminals (H–17)6

and (M-27)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

4B2–75

DRIVE LINE CONTROL SYSTEM (TOD)

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 lever position

Hight

4L

4WD Auto Switch

D04RY00007