1998 OPEL FRONTERA Back

4C–7 DRIVE SHAFT SYSTEM
9. Fix the parking brake cable mounting bolt (Behind the
back plate).
10. Install parking brake assembly, refer to Parking
Brakes in Brake section.
11. Install antilock brake system sensor (if so equipped).
12. Install brake disc.
13. Install brake caliper, refer to Disk Brakes in Brake
section.

4C–39 DRIVE SHAFT SYSTEM
401RW053
401RW052
4. Remove bolt, nut and washer (Front axle side).
5. Remove bolt, nut and washer (Transfer side).
6. Remove front propeller shaft.
NOTE: If equipped with torque on demand (TOD), when
removing, installing or carring for front propeller shaft, be
sure to wind a piece of cloth round the part of the boot with
which fittings may interfere so that the boot can be
protected. The boot may be damaged if bending force is
applied to the constant velocity joint of the shaft.
401RW051
Installation
NOTE: Never install the shaft assembly backwards.
Completely remove the black paint from the connecting
surface of flange coupling on each end of propeller shaft.
Clean so that no foreign matter will be caught in between.
1. Align the mark which was applied at removal. Install
front propeller shaft and tighten the bolts to the
specified torque.
Torque:63Nꞏm (6.4kgꞏm/46lbft)
2. Install the exhaust and transfer protectors.
3. After installing the propeller shaft, be sure to apply
black paint (1) to exposed area (other than
connecting surface) of the entire surface of flange
coupling .
401RS019

4C–43 DRIVE SHAFT SYSTEM
Play in Universal Joint
Limit: Less than 0.1 mm (0.004 in)
401RS010
Constant Velocity Joint
NOTE: LJ and BJ constant velocity joints are
unremovable types. Check the joint for play and the boot
for damage, wear, and leak of grease. If abnormality is
found, replace propeller shaft as an assembly.
Play in Constant Velocity Joint
Fix the shaft in a vise throrgh pieces of wood, and try to
move the joint vertically, right and left, and back and forth
to make sure of smooth motions and no remarkable play.
401RW050
401RW049
Boot of Constant Velocity Joint
Check the boot (2) for crack, damage and grease leak,
and the boot band (1) for loosening and damage. Check
the both sides of the joint and make sure that there is no
leak of grease from the cover press-in parts(3).
401RW048

4C–49 DRIVE SHAFT SYSTEM
Removal
1. Jack up the vehicle and support it on the chassis
stands.
2. Gear shift lever should be placed in neutral position
and parking brake released.
NOTE: Apply alignment marks on the flange at the rear
propeller shaft both front and rear side.
401RS023
3. Remove bolt, nut and washer (Rear axle side).
4. Remove bolt, nut and washer (Transfer side).
5. Remove rear propeller shaft.
Installation
NOTE: Never install the shaft assembly backwards.
1. Completely remove the black paint from the
connecting surface of flange coupling on each end of
propeller shaft. Clean so that no foreign matter will be
caught in between.
2. Align the mark which is applied at removal .
Install rear propeller shaft and tighten the bolts to the
specified torque.
Torque: 63 Nꞏm (6.4 kgꞏm/46 lb ft)3. After installing the propeller shaft, be sure to apply
black paint (1) to exposed area (other than
connecting surface) of the entire surface of flange
coupling .
401RS022

4D2–13 TRANSFER CASE (TOD)
2. Strike the speed gear and tone wheel with a rod or
other appropriate tool from the outside of the transfer
cover assembly, and remove the ball bearing and
speed gear and tone wheel.
NOTE: Be careful not to damage the speed gear teeth.
266RW018
3. Remove the stopper plate on the back with a
precision screwdriver or other appropriate tool
starting from the small lock of the plate.
NOTE: Be careful not to damage the stopper plate during
the work.
261RW042
4. Using a terminal pull-out tool or an equivalent tool,
push down the lock to unlatch the terminal for the coil
assembly, and pull the terminal out.
NOTE: Be careful not to damage other terminals.
261RW032
5. Remove the fixing nuts of the coil assembly from the
outside of the transfer cover assembly. Remove the
coil assembly from the transfer cover.
261RW030

5A–4
BRAKE CONTROL SYSTEM
normal braking when a malfunction has occurred in the
ABS.
The EHCU has a self-diagnosing function which can
indicate faulty circuits during diagnosis.
The EHCU is mounted on the engine compartment front
right side. It consists of a Motor, Plunger Pump, Solenoid
Valves and Check Valve.
On the outside, the relay box containing a motor relay and
a valve relay is installed.
Solenoid Valves: Reduces or holds the caliper fluid
pressure for each front disc brake or both rear disc brakes
according to the signal sent from the EHCU.
Reservoir: Temporarily holds the brake fluid that returns
from the front and rear disc brake caliper so that pressure
of front disc brake caliper can be reduced smoothly.
Plunger Pump: Feeds the brake fluid held in the reservoir
to the master cylinder.
Motor: Drives the pump according to the signal from
EHCU.
Check Valve: Controls the brake fluid flow.
ABS Warning Light
821RW033Vehicles equipped with the Anti-lock Brake System have
an amber “ABS” warning light in the instrument panel.
The “ABS” warning light will illuminate if a malfunction in
the Anti-lock Brake System is detected by the Electronic
Hydraulic Control Unit (EHCU). In case of an electronic
malfunction, the EHCU will turn “ON” the “ABS” warning
light and disable the Anti-lock braking function.
The “ABS” light will turn “ON” for approximately three
seconds after the ignition switch is to the “ON” position.
If the “ABS” light stays “ON” after the ignition switch is the
“ON” position, or comes “ON” and stays “ON” while
driving, the Anti-lock Brake System should be inspected
for a malfunction according to the diagnosis procedure.
Wheel Speed Sensor
It consists of a sensor and a rotor. The sensor is attached
to the knuckle on the front wheels and to the axle shaft
bearing holder on the rear wheels.
The rotor is press-fit in the axle shaft.The flux generated from electrodes magnetized by a
magnet in the sensor varies due to rotation of the rotor,
and the electromagnetic induction generates alternating
voltage in the coil. This voltage draws a “sine curve” with
the frequency proportional to rotor speed and it allows
detection of wheel speed.
G-Sensor
The G-sensor installed inside the center console detects
the vehicle deceleration speed and sends a signal to the
EHCU. In 4WD operation, all four wheels may be
decelerated in almost the same phase, since all wheels
are connected mechanically.
This tendency is noticeable particularly on roads with low
friction coefficient, and the ABS control is adversely
affected.
The G-sensor judges whether the friction coefficient of
road surface is low or high, and changes the EHCU’s
operating system to ensure ABS control.
Normal and Anti-lock Braking
Under normal driving conditions, the Anti-lock Brake
System functions the same as a standard power assisted
brake system. However, with the detection of wheel
lock-up, a slight bump or kick-back will be felt in the brake
pedal. This pedal “bump” will be followed by a series of
short pedal pulsations which occurs in rapid succession.
The brake pedal pulsation will continue until there is no
longer a need for the anti-lock function or until the vehicle
is stopped. A slight ticking or popping noise may be heard
during brake applications when the Anti-lock features is
being used.
When the Anti-lock feature is being used, the brake pedal
may rise even as the brakes are being applied. This is
also normal. Maintaining a constant force on the pedal
will provide the shortest stopping distance.
Brake Pedal Travel
Vehicles equipped with the Anti-lock Brake System may
be stopped by applying normal force to the brake pedal.
Although there is no need to push the pedal beyond the
point where it stops or holds the vehicle, by applying more
force the pedal will continue to travel toward the floor.
This extra brake pedal travel is normal.
Acronyms and Abbreviations
Several acronyms and abbreviations are commonly used
throughout this section:
ABS
Anti-lock Brake System
CKT
Circuit
DLC
Data Link Connector
EHCU
Electronic Hydraulic Control Unit
FL
Front Left

5A–5 BRAKE CONTROL SYSTEM
FR
Front Right
GEN
Generator
MV
Millivolts
RL
Rear Left
RR
Rear RightRPS
Revolution per Second
VDC
Vo l t s D C
VA C
Vo l t s A C
W/L
Warning Light
WSS
Wheel Speed Sensor
General Diagnosis
General Information
ABS malfunction can be classified into two types, those
which can be detected by the ABS warning light and those
which can be detected as a vehicle abnormality by the
driver.
In either case, locate the fault in accordance with the
“BASIC DIAGNOSTIC FLOWCHART” and repair.
Please refer to Section 5C for the diagnosis of
mechanical troubles such as brake noise, brake judder
(brake pedal or vehicle vibration felt when braking),
uneven braking, and parking brake trouble.
ABS Service Precautions
Required Tools and Items:
Box Wrench
Brake Fluid
Special Tool
Some diagnosis procedures in this section require the
installation of a special tool.
J-39200 High Impedance Multimeter
When circuit measurements are requested, use a circuit
tester with high impedance.
Computer System Service Precautions
The Anti-lock Brake System interfaces directly with the
Electronic Hydraulic Control Unit (EHCU) which is a
control computer that is similar in some regards to the
Powertrain Control Module. These modules are designed
to withstand normal current draws associated with
vehicle operation. However, care must be taken to avoid
overloading any of the EHCU circuits. In testing for opens
or shorts, do not ground or apply voltage to any of the
circuits unless instructed to do so by the appropriate
diagnostic procedure. These circuits should only be
tested with a high impedance multimeter (J-39200) or
special tools as described in this section. Power should
never be removed or applied to any control module with
the ignition in the “ON” position.
Before removing or connecting battery cables, fuses or
connectors, always turn the ignition switch to the “OFF”
position.
General Service Precautions
The following are general precautions which should be
observed when servicing and diagnosing the Anti-lock
Brake System and/or other vehicle systems. Failure toobserve these precautions may result in Anti-lock Brake
System damage.
If welding work is to be performed on the vehicle using
an electric arc welder, the EHCU and valve block
connectors should be disconnected before the
welding operation begins.
The EHCU and valve block connectors should never
be connected or disconnected with the ignition “ON” .
EHCU of the Anti-lock Brake System are not
separately serviceable and must be replaced as
assemblies. Do not disassemble any component
which is designated as non-serviceable in this
Section.
If only rear wheels are rotated using jacks or drum
tester, the system will diagnose a speed sensor
malfunction and the “ABS” warning light will
illuminate. But actually no trouble exists. After
inspection stop the engine once and re-start it, then
make sure that the “ABS” warning light does not
illuminate.
If the battery has been discharged
The engine may stall if the battery has been completely
discharged and the engine is started via jumper cables.
This is because the Anti-lock Brake System (ABS)
requires a large quantity of electricity. In this case, wait
until the battery is recharged, or set the ABS to a
non-operative state by removing the fuse for the ABS
(40A). After the battery has been recharged, stop the
engine and install the ABS fuse. Start the engine again,
and confirm that the ABS warning light does not light.
Note on Intermittents
As with virtually any electronic system, it is difficult to
identify an intermittent failure. In such a case duplicating
the system malfunction during a test drive or a good
description of vehicle behavior from the customer may be
helpful in locating a “most likely” failed component or
circuit. The symptom diagnosis chart may also be useful
in isolating the failure. Most intermittent problems are
caused by faulty electrical connections or wiring. When
an intermittent failure is encountered, check suspect
circuits for:
Suspected harness damage.
Poor mating of connector halves or terminals not fully
seated in the connector body (backed out).
Improperly formed or damaged terminals.

6A–41
ENGINE MECHANICAL
3. Remove oil strainer fixing bolts, remove oil strainer
assembly with O-ring.
050RW002
Legend
(1) Oil Pump
(2) Oil Strainer
(3) Oil Gallery
(4) From Oil Filter
(5) To Oil Filter
4. Remove three fixing bolts, oil pipe with O-ring.
5. Remove eight fixing bolts, oil gallery.
6. Remove piston with connecting rod assembly, before
removing the bearing cap, remove carbon on the top
of cylinder bore and push piston with connecting rod
out from the top of cylinder bore.
Installation
1. Install piston with connecting rod assembly.
Apply engine oil to cylinder bore, connecting rod
bearing and crank pin.
When installing the piston, its front mark must face
the engine front side.
The bearing cap number must be the same as
connecting rod number.
Apply engine oil to the thread and seating surface of
each nut.
Tighten nuts to the specified torque.
Torque : 54 Nꞏm (5.5 Kgꞏm/40 lb ft)
After tightening the nuts, make sure that the
crankshaft rotates smoothly.
NOTE: Do not apply engine oil to the bearing back faces
and connecting rod bearing fitting surfaces.
015RW003
Legend
(1) Piston Front Mark
(2) Piston Grade
(3) Connecting Rod Front Mark
2. Install oil gallery and tighten the bolts in two steps, in
the order shown in illustration.
To r q u e :
1st step : 29 Nꞏm (3.0 Kgꞏm/21 lb ft)
2nd step : 55
–65
051RS009
3. Install oil pipe with O-ring.
Torque : 10 Nꞏm (1.0 Kgꞏm/89 lb in)
4. Install oil strainer assembly with O-ring.
Torque : 25 Nꞏm (2.5 Kgꞏm/18 lb ft)
5. Install crankcase with Oil Pan.
Refer to installation procedure for Oil Pan and
Crankcase in this manual.
6. Install cylinder head assembly.
Refer to installation procedure for Cylinder Head in
this manual.