Opel Frontera UBS. Service manual — part 135
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
4B1–33
DRIVE LINE CONTROL SYSTEM (SHIFT ON THE FLY)
Inspection and Repair
Vacuum Piping
C04RW014
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).
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