Isuzu Trooper (2000 year). Manual - part 114

DRIVE LINE CONTROL SYSTEM (TOD)

4B2–76

Chart E–2

The AXLE switch circuit is short-circuited to GND.

Function of circuit

—

Fail condition

Even after the 4WD Auto Switch is select to the 2WD position, the 2WD mode is not en-

abled. (The transition status is not removed.)

Indicator lamp status

Transfer position

2H

D04RY00007

4B2–77

DRIVE LINE CONTROL SYSTEM (TOD)

Step

Action

Yes

No

1

Start the engine.

When the transfer lever is shifted to the neutral position between
high and 4L, is the battery voltage observed between terminals 42
and 46?

Go to Step 2

Go to Step 7

2

When the transfer lever is shifted to the high position and 4WD
Auto Switch selected to 4WD position, is 0V observed between
terminals 42 and 46?

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 Switch to the 2WD position.

Is 12V observed between terminals 17 and 46?

Go to Step 5

Go to Step 19

5

Is 12V observed between terminals 6 and 46?

Go to Step 6

Go to Step 19

6

Is 12V observed between terminals 18 and 46?

The phenomenon

is not

reproduced.

Refer to

“Troubles

intermittently

observed”.

Go to Step 19

The ECU has

failed. Replace

the ECU.

Go to Step 17

7

When the 4WD Auto Switch is select to the 2WD position, is the
battery voltage observed between terminals 23 and 46?

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 23
and 46?

Go to Step 9

Go to Step 11

9

When the transfer lever is shifted to the high position and 4WD
Auto Switch selected to 4WD position, is 0V observed between
terminals 23 and 46?

Go to Step 10

Go to Step 11

10

When the transfer lever is shifted to the 4L position, is 0V
observed between terminals 23 and 46?

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”.

Go to Step 19

The ECU has

failed. Replace

the ECU.

Go to Step 19

12

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

Does the resistance between terminals (B–48)1 and (B–48)24
meet the standard, 17<  R < 25 ohm?

Go to Step 13

Repair the circuit

of replace the

VSV.

Go to Step 19

13

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

When the 4WD Auto Switch is select to the 2WD position, is the
battery voltage supplied to each VSV?

Go to Step 14

Repair the circuit

of 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

of replace the

VSV.

Go to Step 19

15

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

Go to Step 16

Repair the circuit

of replace the

VSV.

Go to Step 19

DRIVE LINE CONTROL SYSTEM (TOD)

4B2–78

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

of 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 “Driveline

Control System”).

Go to Step 19

Replace the

AXLE switch

(refer to Section

4B1 “Driveline

Control System”).

Go to Step 19

19

Check that all the parts are mounted.

Is this step complete?

Repeat the

“Diagnosis Flow”.

Return to Step 19

4B2–79

DRIVE LINE CONTROL SYSTEM (TOD)

Chart G

The trouble codes are displayed.

Function of circuit

—

Fail condition

Indicator lamp status

Transfer position

—

D04RY00009