Opel Frontera UBS. Manual - part 128

 

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Opel Frontera UBS. Manual - part 128

 

 

4B1–2 DRIVE LINE CONTROL SYSTEM (SHIFT ON THE FLY)

Shift on the Fly System (Lever Type)

Outline of Shift on the Fly System
(Lever Type)

The shift on the fly system (Lever type) switches between
2 wheel drive (2WD) and 4 wheel drive (4WD) by driver’s
shifting the transfer control lever on the floor.
This system controls below operations.

1. Connecting front wheels to, and disconnecting them

from, the front axles by vacuum actuator.

2. Indicator on instrument panel.
3. 4WD signal to Electronic Hydraulic Control Unit for

brake system (If anti–lock brake system is equipped).

4B1–3

DRIVE LINE CONTROL SYSTEM (SHIFT ON THE FLY)

Shift on the Fly Vacuum Piping and Electric Equipment

 (For Lever Control Type)

Vacuum Piping Diagram

C04RW015

VSV Assembly, Actuator Assembly

412RS032

Vacuum Tank

412RS033

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

Inspection and Repair

Vacuum Piping

C04RW016

1. Pull out the Hose A in figure and install a vacuum

gauge.

2. Plug up Hose B in figure to prevent the leak of

vacuum.

3. Start the engine and measure vacuum 2 or 3 minutes

afterward.

4. Repeat 1) and 2) but with Hose A plugged and Hose B

pulled out.

5. If vacuum measures –400mmHg, or if it shows a

sudden drop immediately after engine stop, inspect
the hose, tank, and pipe for damage.

NOTE: Be careful not to permit the entry of dust and
water during inspection.

6. Pull out Hose D in above illustration.
7. Plug Hose E in above illustration.
8. Make sure that Hose D in above illustration is under

atmospheric pressure.

9. Pull out Hose E and plug Hose D, and make sure that

Hose E is under atmospheric pressure.

10. If Check 8) or 9) has revealed stoppage, check and

see that there is no bend, foreign matter in the hose or
in the filter. If there is trouble, repair or replace.

Check Valve

C04RS004

1. Apply vacuum from the orange colored side(1).

Vacuum:–400mmHg

2. Check leakage of vacuum.
3. Make sure that vacuum cannot be applied from the

black colored side(2).

4B1–5

DRIVE LINE CONTROL SYSTEM (SHIFT ON THE FLY)

4. If vacuum is not applicable as much as –400mmHg,

and if there is resistance on the intake side, replace
with a new check valve.

VSV Assembly

Inspect the vehicle side harness as follows:

412RS071

Legend

(1) Grey
(2) Blue

1. Remove connector.
2. Shift transfer lever to 2H and start the engine.

NOTE: Do not move the vehicle while inspection.

3. Make sure that there is continuity in the vehicle side of

harness. If there is no continuity, check transfer shift
switch and wiring.

Inspect both VSVs as follows:

F04RS004

1. With battery not connected (Usual).

A–C:There is continuity

B:Closed

2. With battery connected

A – B:There is continuity

C:Closed

3. If 1) and 2) fail, replace with a new VSV.

Axle Position Switch

412RS048

1. With ball (1) being free

A – B:There is continuity

2. With ball forced into the switch

A – B:No continuity

3. If 1) and 2) fail, replace with a new switch.

 

 

 

 

 

 

 

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