1998 ISUZU TROOPER instrument panel

DRIVE LINE CONTROL SYSTEM (TOD) 4B2±6
High-Low Planetary Gear Set
Establishes an auxiliary transmission mechanism. When
the transfer shift lever is set to the 2H or TOD position, the
reduction gear ratio is 1.000 and the corresponding
driving force is generated. When the transfer shift lever is
set to the 4L position, the reduction gear ratio is 2.480 and
the corresponding driving force is generated.
262RW030
4H and 4L Switches
Detects the shift position of the transfer from the
movement of the transfer lever and outputs signals to the
TOD control unit.
261RW002
Transfer Connector
Transmits the input and output signals of the speed
sensors, electromagnetic coil, and 4H and 4L switches to
the vehicle harness. A waterproof 12-pin type is used.
261RW046
TOD Indicator Lamps (on the instrument
panel)
Inform the following items.

Bulb check

Drive mode

ABS IN status

BRAKE ON status
821RW049

TRANSFER CASE (STANDARD TYPE)
4D1±43
Main Data and Specifications
General Specifications
TypeW/Shift On The Fly System model
Synchronized type gears shifting between the 2 and 4 wheel drive mode.
Constant mesh type gears shifting between ªlowº and ªhighº.
WO/Shift On The Fly System model
Constant mesh type gears shifting between the 2 and 4 wheel drive mode,
and between ªlowº and ªhighº.
Control methodW/4WD Switch model
Electric control with the button switch on the instrument panel for gear
shifting between the 2 and 4 wheel drive mode.
Remote control with the gear shift lever on the floor for gear shifting
between ªlow and highº .
WO/4WD Switch model
Remote control with the gear shift lever on the floor for gear shifting.
Gear ratioHigh; 1.000
Low; 2.050
Oil capacity1.45 lit. (1.53 U.S. quart)
Type of lubricantEngine oil
Refer to chart in Section 0
Torque Specifications
E07RW037

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 ªABSº warning light in the instrument panel.
The ªABSº 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 ªONº the ªABSº warning
light and disable the Anti-lock braking function.
The ªABSº light will turn ªONº for approximately three
seconds after the ignition switch is to the ªONº position.
If the ªABSº light stays ªONº after the ignition switch is the
ªONº position, or comes ªONº and stays ªONº 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 ªsine curveº 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 ªbumpº 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

5C – 34 POWER ASSISTED BRAKE SYSTEM
BRAKE PEDAL REPLACEMENT
10
9
5
124
2 7 86
11
3
1
M/T
Removal Steps
1. Shift knob
2. Front console assembly
3. Lower cluster assembly
4. Instrument panel driver lower cover
assembly
5. Anti-theft controller
6. Stoplight switch connector
7. Return spring
8. Snap pin
9. Pin
10. Nut
11. Pin, fulcrum
12. Brake pedal
Installation Steps
12. Brake pedal
11. Pin, fulcrum
10. Nut
9. Pin
8. Snap pin
7. Return spring
6. Stoplight switch connector
5. Anti-theft controller
4. Instrument panel driver lower cover
assembly
3. Lower cluster assembly
2. Front console assembly
1. Shift knob
This illustration is based on the LHD model.

POWER ASSISTED BRAKE SYSTEM 5C – 35
REMOVAL
1. Shift Knob
2. Front Console Assembly
3. Lower Cluster Assembly
4. Instrument Panel Driver Lower Cover Assembly
5. Anti-theft Controller
6. Stoplight switch Connector
7. Return Spring
8. Snap Pin
9. Pin
10. Nut
11. Pin, Fulcrum
12. Brake Pedal
INSTALLATION
12. Brake Pedal
11. Pin, Fulcrum
•Apply grease to the entire circumference of the
fulcrum pin.
10. Nut
Bolt and Nut Torque N·m (kg·m / lb·ft)
33 (3.3 / 24)
9. Pin
•Apply grease to the entire circumference of the
push rod pin.
8. Snap Pin
•Adjust pedal free travel. Refer to “Brake Pedal
Adjustment” previously in this section.
7. Return Spring
6. Stoplight Switch Connector
5. Anti-theft Connector
4. Instrument Panel Driver Lower Cover Assembly
3. Lower Cluster Assembly
2. Front Console Assembly
1. Shift Knob

5C – 36 POWER ASSISTED BRAKE SYSTEM
STOPLIGHT SWITCH REPLACEMENT
675
423
M/T1
Removal Steps
1. Shift Knob
2. Front Console Assembly
3. Lower Cluster Assembly
4. Instrument Panel Driver Lower Cover
Assembly
5. Stoplight Switch Connector
6. Lock Nut
7. Switch
Installation Steps
7. Switch
6. Lock Nut
5. Stoplight Switch Connector
4. Instrument Panel Driver Lower Cover
Assembly
3. Lower Cluster Assembly
2. Front Console Assembly
1. Shift Knob
REMOVAL
1. Shift Knob
2. Front Console Assembly
3. Lower Cluster Assembly
4. Instrument Panel Driver Lower Cover Assembly
5. Stoplight Switch Connector
6. Lock Nut
7. Switch
This illustration is based on the LHD model.

POWER ASSISTED BRAKE SYSTEM 5C – 37
INSTALLATION
7. Switch
•Adjust the stoplight switch to the specified
clearance (between switch housing and brake
pedal) by rotating the switch housing.
Clearance mm (in)
0 – 0.2 (0 – 0.008)
NOTE:
While adjusting the installation of the stoplight
switch, make sure that the threaded part of the
stoplight switch does not push the brake pedal.
6. Lock Nut
5. Stoplight Switch Connector
4. Instrument Panel Driver Lower Cover Assembly
3. Lower Cluster Assembly
2. Front Console Assembly
1. Shift Knob(A)

6A±17
ENGINE MECHANICAL
Malfunction Indicator Lamp
The instrument panel ªCHECK ENGINEº Malfunction
Indicator Lamp (MIL) illuminates by self diagnosticsystem when the system checks the starting of engine, or
senses malfunctions.
Condition
Possible causeCorrection
ªCHECK ENGINEº MIL does not
illuminate at the starting of engine
Bulb defectiveReplace
illuminate at the starting of engineMIL circuit openCorrect or replace
Command signal circuit to operate
self diagnostic system shortedCorrect or replace
Engine Control Module (PCM) cable
loosely connected, disconnected or
defectiveCorrect or replace
PCM defectiveReplace
ªCHECK ENGINEº MIL illuminates,
and stays onDeterioration of heated oxygen
sensor internal elementReplace
Heated oxygen sensor connector
terminal improper contactReconnect properly
Heated oxygen sensor lead wire
shortedCorrect
Heated oxygen sensor circuit openCorrect or replace
Deterioration of engine coolant
temperature sensor internal elementReplace
Engine coolant temperature sensor
connector terminal improper contactReconnect properly
Engine coolant temperature sensor
lead wire shortedCorrect
Engine coolant temperature sensor
circuit openCorrect or replace
Throttle position sensor open or
shorted circuitsCorrect or replace
Deterioration of crankshaft position
sensorReplace
Crankshaft position sensor circuit
open or shortedCorrect or replace
Vehicle speed sensor circuit openCorrect or replace
Manifold absolute pressure sensor
circuit open or shortedCorrect or replace
Intake air temperature sensor circuit
open or shortedCorrect or replace
Fuel injector circuit open or shortedCorrect or replace
PCM driver transistor defectiveReplace PCM
Malfunctioning of PCM RAM
(Random Access Memory) or ROM
(Read Only Memory)Replace PCM