Opel Frontera UE. Manual - part 86

DRIVELINE CONTROL SYSTEM

4B–1

DRIVELINE/AXLE

DRIVELINE CONTROL SYSTEM

CONTENTS

Service Precaution......................................... 4B - 1

Shift On The Fly System ............................... 4B - 2

Outline of Shift on The Fly System ............. 4B - 2
Functions of Indicator Lamp ....................... 4B - 6
Diagnosis .................................................... 4B - 7

Shift On The Fly Vacuum Piping and 

Electrical Equipment ................................ 4B - 18

Vacuum Piping Diagram ............................. 4B - 18

Actuator Assembly...................................... 4B - 18
Vacuum Tank.............................................. 4B - 18
Inspection and Repair................................. 4B - 19

4WD Control Unit .......................................... 4B - 22

4WD Control Unit Associated Parts............ 4B - 22
Removal...................................................... 4B - 23
Installation................................................... 4B - 23

Service Precaution

WARNING:  THIS VEHICLE HAS A SUPPLEMENTAL 
RESTRAINT SYSTEM (SRS).   REFER TO THE SRS 
COMPONENT AND WIRING LOCATION VIEW IN 
ORDER TO DETERMINE WHETHER  YOU ARE 
PERFORMING SERVICE ON OR NEAR THE SRS 
COMPONENTS OR THE SRS WIRING.  WHEN YOU 
ARE PERFORMING SERVICE ON OR NEAR THE 
SRS COMPONENTS OR THE SRS WIRING,  REFER 
TO THE SRS SERVICE INFORMATION. FAILURE TO 
FOLLOW WARNINGS COULD RESULT  IN 
POSSIBLE AIR BAG DEPLOYMENT, PERSONAL 
INJURY, OR OTHERWISE UNNEEDED SRS SYSTEM 
REPAIRS.

CAUTION:  Always use the correct fastener in the 
proper location.  When you replace a fastener, use 
ONLY the exact part number for that application. 
ISUZU will  call out those fasteners that require a 
replacement after removal. ISUZU will also call out 
the  fasteners that require thread lockers or thread 
sealant. UNLESS OTHERWISE SPECIFIED, do  not 
use supplemental coatings (Paints, greases, or 
other corrosion inhibitors) on threaded  fasteners or 
fastener joint interfaces. Generally, such coatings 
adversely affect the fastener  torque and the joint 
clamping force, and may damage the fastener. When 
you install fasteners,  use the correct tightening 
sequence and specifications. Following these 
instructions can help you  avoid damage to parts 
and systems.

SECTION

4B–2

DRIVELINE CONTROL SYSTEM

Shift On The Fly System

Outline of Shift on The Fly System

The shift on the fly system switches between 2 wheel 
drive (2WD) and 4 wheel drive (4WD)  electrically by 
driver's pressing the 4WD switch (push button type) on 
instrument panel.
This system controls below operations. (Shifting 
between “4H" and “4L" must be performed by transfer 
control lever on the floor.)

1. Shifting the transfer front output gear (Connecting 

to, and disconnecting from, front propeller shaft by 
motor actuator).

2. Retrial of shifting the transfer front output gear.

3. Connecting front wheels to, and disconnecting them 

from, the front axles by vacuum actuator.

4. Indicator on instrument panel.

5. 4WD out signal to other Electronic Hydraulic Control 

Unit.

System Diagrams

412RX009

DRIVELINE CONTROL SYSTEM

4B–3

Normal Operation

The motor actuator mounted on transfer rear case is 
driven by signal from 4WD switch on instrument panel.  
After complete the connecting transfer front output gear 
to, or disconnecting it from, front propeller shaft, 

condition of the transfer position switch changes. The 
vacuum solenoid valve (VSV) is driven by the signal 
from transfer position switch and the vacuum actuator 
connects front wheels to, or disconnect them from, front 
axles.

Time Chart of Shifting Under Normal Condition

F04RW002

4B–4

DRIVELINE CONTROL SYSTEM

Retrial

The motor actuator starts transfer gear shifting after 
signal from 4WD switch on instrument panel has been 
received.  But the shifting may be impossible in cold 
weather or under high speed condition.  When 2 
seconds have passed since transfer gear shifting 
started and the transfer position switch dose not turn on 
(the gear engagement is not completed), the motor 
reverses its rotation for 1.2 seconds and tries again to 
shift transfer gear.  This procedure is repeated 3 times 

in maximum.  While this procedure, 4WD indicator lamp 
blinks by 2 Hz.
If the transfer position switch does not turn on after 
aforementioned procedure has been repeated 3 times, 
the gear shifting is stopped and 4WD indicator lamp's 
blinking changes from 2Hz to 4Hz to notify driver that 
the gear shifting is stopped.  This blinking of indicator 
lamp continues until 4WD switch is returned from 4WD 
to 2WD.

Time Chart of Shifting Under Severe Condition (retrial)

F04RX004