Opel Frontera UBS. Manual - part 1984

4B2–83

DRIVE LINE CONTROL SYSTEM (TOD)

Chart C–1

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

Function of circuit

—

Fail condition

When the 4WD AUTO SW is 4WD mode.

When the lever is shifted from 4L to HIGH, the 4L mode remains on the indicator and the

TOD mode is displayed without turning off the previous mode.

Indicator lamp status

Transfer position

4L <——> Neutral <——> TOD

D04RY00114

DRIVE LINE CONTROL SYSTEM (TOD)

4B2–84

D04RY00115

4B2–85

DRIVE LINE CONTROL SYSTEM (TOD)

Step

Action

Yes

No

1

1. Turn on the starter switch.

When the transfer lever is shifted to the high position, is 5V
observed between terminals 8 and 19 (4H switch)?

Go to Step 2

Go to Step 4

2

When the transfer lever is shifted to the 4L position, is 5V
observed between terminals 8 and 19 (4H switch)?

Go to Step 3

Go to Step 4

3

When the transfer lever is shifted to the neutral position, is 0V
observed between terminals 8 and 19 (4H switch)?

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 8 and 19 (4H 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 8 and 19 (4H switch)?

Go to Step 6

Go to Step 7

6

When the transfer lever is shifted to the 4L position, is 12V
observed between terminals 8 and 19 (4H switch)?

The 4H switch

circuit is

short-circuited

between ECU

and transfer on

battery.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 neutral position, is the
continuity established between terminals 8 and 19 (4H switch)?

Go to Step 8

Go to Step 10

8

When the transfer lever is shifted to the high position, is the
continuity established between terminals 8 and 19?

Go to Step 11

Go to Step 9

9

When the transfer lever is shifted to the 4L position, is the
continuity established between terminals 8 and 19?

Go to Step 12

The ECU has

failed.

Replace the

ECU.

Go to Step 13

10

When the transfer lever is shifted to the neutral position, is the
continuity established between terminals (A–3)4 and (A–3)7?

The 4H switch

circuit is broken

between ECU

and

transfer.Repair

the circuit.

Go to Step 13

Repair the

transfer

assembly.

Go to Step 13

11

When the transfer lever is shifted to the high   position, is the
continuity established between transfer connector terminals
(A–3)4 and (A–3)7?

Repair the

transfer

assembly.

Go to Step 13

Repair the 4HSW

circuit.

Go to Step 13

12

When the transfer lever is shifted to the 4L position, is the
continuity established between transfer connector terminals
(A–3)7 and (A–3)4?

Repair the

transfer

assembly.

Go to Step 13

Repair the 4H

SW circuit.

Go to Step 13

DRIVE LINE CONTROL SYSTEM (TOD)

4B2–86

Step

No

Yes

Action

13

Check that all the parts are mounted.

Is this step complete?

Repeat the

“Diagnosis Flow”.

Return to Step 13