Opel Frontera UE. Manual - part 87

DRIVELINE CONTROL SYSTEM

4B–5

Warning at “4L" position :In view of the shifting
mechanism of transfer, the gear shifting from 4WD to
2WD at “4L" condition is impossible. Therefore, the
transfer position switch can not be turned off by 4WD

switch when vehicle is in “4L" condition. In the case this
condition continues for 2 seconds, the shifting to 2WD is
stopped and the indicator lamp's blinking changes from
2Hz to 4Hz to notify driver of wrong operation.

Time Chart of Shifting from 4WD to 2WD at “4L" Condition

F04RX005

4WD out signal to other Electronic Hydraulic
Control Unit : ECU of shift on the fly sends 4WD out
signal to other Electronic Hydraulic Control Unit as
below.

4WD out signal

(Period)

Vehicle Condition

Transfer position switch

Front axle switch

120 ms

2WD

2WD (Open)

240 ms

4WD

4WD (Close)

4B–6

DRIVELINE CONTROL SYSTEM

Functions of Indicator Lamp

Indication of vehicle condition : Indicator lamp is
controlled by ECU of shift on the fly and shows vehicle
conditions as below.

Bulb check :The bulb of indicator lamp is checked for 2
seconds when ignition key is turned on.

Time Chart of Bulb Checking

F04RW004

Retrials from 2WD to 4WD :In cold weather or under
high speed condition, the gear shifting (engagement)
sometimes dose not complete by 3 trials. In such case,
the indicator lamp inform driver of this incident as
aforementioned chart (shown at Retrial in Outline of
shift on the fly system.)

Indicator

Vehicle condition

4WD switch

Transfer position

switch

Front axle switch

Off

2WD

Off (Close)

2WD (Open)

4WD

On (Open)

4WD (Close)

Blink (2Hz)

Operating

On (Open)

4WD (Close)

2WD (Open)

Off (Close)

2WD (Open)

4WD (Close)

Blink (4Hz)

Stop operating

On (Open)

2WD (Open)

Off (Close)

4WD (Close)

DRIVELINE CONTROL SYSTEM

4B–7

Diagnosis

Before Judging That Troubles Occur
(Unfaulty mode)

When Switching from 2WD to 4WD

1. In case that blinking frequency of the 4WD

indicator changes from 2Hz to 4Hz.
When heavy synchronization load is needed, the
motor actuator tries the shifting transfer gear three
times including the activation shifting. While the
motor actuator tries shifting, the indicator blinks by
2Hz. If the third shifting fails, the indicator's blinking
changes from 2Hz to 4Hz at the same time that the
motor actuator shifted back to 2WD.
Heavy synchronization load occurs by

• extremely lower temperature.

• higher speed.rotation difference of wheels during

cornering.

Solution 1: Operate again after stop the vehicle
or slow down.

2. In case that the 4WD indicator continues

blinking by 2Hz for more than 11.5 seconds.
When there is rotation difference of wheels or there
is phase difference between front wheels and axles,
it is difficult to connect front wheels to front axles.
The blinking by 2Hz shows that shifting the transfer
gear or connecting the front wheels is in the middle
of operating.  In above case, the indicator's blinking
by 2Hz shows that connecting the front wheels is
not completed (because the indicator's blinking
changes to 4Hz when the shifting transfer gear is
impossible.).  And removal of rotation or phase
difference make connecting the front wheels
possible.
Solution 2: When vehicle is running, drive
straight ahead while accelerating and
decelerating. When vehicle is at a stop, move
the vehicle forward and backward from 2 to 3
meters.

When Switching from 4WD to 2WD

1. In case that the 4WD indicator continues

blinking by 2Hz .
The 4WD indicator continues blinking by 2Hz until
both shifting the transfer gear and disconnecting the
front wheels are completed when switching 4WD to
2WD. When drive line is loaded with torsional
torque, the shifting transfer gear and disconnecting
front wheels are impossible. In this case, removal of
torsional torque on drive line make the shifting
transfer gear and disconnecting front wheels
possible.
Solution 3: When vehicle is running, drive
straight ahead while accelerating and
decelerating. When vehicle is at a stop, move
the vehicle forward and backward from 2 to 3
meters.

2. In case that the 4WD indicator's blinking changes

from 2Hz to 4Hz.
Check the position of transfer lever. Is it at “4L"
position? In view of the shifting mechanism of
transfer, the gear shifting from 4WD to 2WD at “4L"
condition is impossible.
Solution 4: Push the 4WD switch to 4WD, shift
the transfer lever to “High" position and re-
operate the 4WD switch to 2WD.

4B–8

DRIVELINE CONTROL SYSTEM

Parts Location

D08RX290

Legend

EndOFCallout

(1) Battery
(2) Relay & Fuse Box (Engine Room)
(3) H–32
(4) Relay & Fuse Box (Instrument Panel)
(5) I–19
(6) I–1
(7) I–2
(8) B–8
(9) B–19

(10) C–32

(11) H–15
(12) C–16
(13) C–31
(14) H–18
(15) H–9 (X22SE)
(16) C–15
(17) M–21
(18) H–9 (6VD1), H–10
(19) M–11, M–12

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