Opel Frontera UBS. Manual - part 1961

4B1–29

DRIVE LINE CONTROL SYSTEM (SHIFT ON THE FLY)

3. Case that indicator’s blinking changes to 4Hz

after aforementioned Solution 4 is carried out.

Step

Action

Yes

No

1

Can the transfer lever be operated from High to 4L or vice versa?

Faults on the

harness wiring of

motor actuator.

Trace this chart

from the start

after repair or

replace.

Faults on the

motor actuator.

Trace this chart

from the start

after replace.

Internal faults on

transfer case.

Disassemble the

transfer case for

check.  Trace this

chart from the

start after repair

or replace.

Faults on the

4WD control unit.

Trace this chart

from the start

after replace.

4B1–30DRIVE LINE CONTROL SYSTEM (SHIFT ON THE FLY)

Front Axle Diagnosis

D

When the 4WD switch is operated from 4H to 2H,
indicator light does not go out.

Step

Action

Yes

No

1

Drive slow 100 — 200m after a few minutes” idling.

Has indicator light gone out?

All right.

Go to Step 2

2

Jack up front tires.

Does the right side of front wheel rotate when the left side of front
wheel is rotated?

Go to Step 4

Go to Step 3

3

1. Check the actuator switch.
2. Check the circuit to indicator.

Was a problem found?

Trace this chart

from the start

after repair or

replace.

Disassemble axle

ASM for check.

Trace this chart

from the start

after repair or

replace.

4

1. Check the VSV valve.
2. Check the circuit to VSV valve.

Was a problem found?

Trace this chart

from the start

after repair or

replace.

Go to Step 5

5

Is vacuum piping all right? (tank, hose, & pipe damage or trouble)

Go to Step 6

Trace this chart

from the start

after repair or

replace.

6

Does actuator work all right?

Trace this chart

from the start.

Disassemble axle

ASM for check.

Trace this chart

from the start

after repair or

replace.

4B1–31

DRIVE LINE CONTROL SYSTEM (SHIFT ON THE FLY)

D

When the 4WD switch is operated from 2H to 4H,
indicator light is not actuated.

Step

Action

Yes

No

1

Drive slow 100 — 200m after a few minutes” idling.

Has indicator light actuated?

All right.

Go to Step 2

2

Jack up front tires.

Does not the right side of front wheel rotate when the left side of
front wheel is rotated?

Go to Step 4

Go to Step 3

3

1. Check the actuator switch.
2. Check the circuit to indicator.

Was a problem found?

Trace this chart

from the start

after repair or

replace.

Disassemble axle

ASM for check.

Trace this chart

from the start

after repair or

replace.

4

1. Check the VSV valve.
2. Check the circuit to VSV valve.

Was a problem found?

Trace this chart

from the start

after repair or

replace.

Go to Step 5

5

Is vacuum piping all right? (tank, hose, & pipe damage or trouble)

Go to Step 6

Trace this chart

from the start

after repair or

replace.

6

Does actuator work all right?

Trace this chart

from the start.

Disassemble axle

ASM for check.

Trace this chart

from the start

after repair or

replace.

4B1–32DRIVE LINE CONTROL SYSTEM (SHIFT ON THE FLY)

Shift on the Fly Vacuum Piping and Electric Equipment 

(For Push Button Type)

Vacuum Piping Diagram

C04RW013

VSV Assembly, Actuator Assembly

412RS032

Vacuum Tank

412RS033