1998 ISUZU TROOPER relay

6E±191 4JX1±TC ENGINE DRIVEABILITY AND EMISSIONS
Starter Motor Doesn't Rotate

StepActionValue(s)Ye sNo
1DEFINITION:
As starter motor doesn't rotate, engine is not cranked.
1. Perform a bulletin search.
2. If a bulletin that addresses the symptom is found,
correct the condition as instructed in the bulletin.
Was the bulletin found?
ÐVerify repairGo to Step 2
2Was a visual/physical check performed?
ÐGo to Step 3
Go to Visual/
Physical
Check
31. Check battery cord terminal for looseness & poor
contact due to corrosion.
2. Check battery voltage.
3. If a problem is found, repair as necessary.
Was a problem found?
ÐVerify repairGo to Step 4
41. Check fan belt for looseness & damage.
2. If a problem is found, adjust or replace as
necessary.
Was a problem found?
ÐVerify repairGo to Step 5
51. Check fuse bull link for disconnection & short.
2. If a problem is found, repair as necessary.
Was a problem found?
ÐVerify repairGo to Step 6
61. Check generator for mount & damage (Refer to
Engine Mechanical).
2. If a problem is found, repair as necessary.
Was a problem found?
ÐVerify repairGo to Step 7
71. Check starter SW and starter relay for looseness
and damage.
2. If a problem is found, repair as necessary.
Was a problem found?
ÐVerify repairGo to Step 8
81. Check starter motor for mount and damage. (Refer
to
Engine Mechanical)
2. If a problem is found, repair as necessary.
Was a problem found?
ÐVerify repairGo to Step 9
91. Review all diagnostic procedures within this table.
2. If all procedures have been completed and no
malfunctions have been found, review/inspect the
following:

Visual/physical inspection

Tech 2 data

Freeze Frame data/Failure Records butter

All electrical connections within a suspected
circuit and/or system
3. If a problem is found, repair as necessary.
Was a problem found?
ÐVerify repair
Contact
Technical
Assistance

6E±196
4JX1±TC ENGINE DRIVEABILITY AND EMISSIONS
QOS System Doesn't Work

StepActionValue(s)Ye sNo
1Was OBD System check performed?
ÐGo to Step 2
Go to OBD
System
Check
2Check glawplug indicator light. If bulb is broken,
replace.
Was a problem found?
ÐVerify repairGo to Step 3
31. Connect a circuit tester between glawplug & engine
ground.
2. With ignition on and engine off, check if the glaw
indicator and circuit tester indicate power voltage
for 9 to 13 sec. If not indicated, repair terminal & wire
harness.
Was repair needed?
ÐVerify repairGo to Step 4
41. Connect a circuit tester between glawplug and
engine ground.
2. With engine on, check if voltage continues for 180
sec. If not, inspect and repair glaw relay.
Was repair needed?
ÐVerify repairGo to Step 5
51. Remove the glawplug, and if damaged, replace.
2. Check glawplug resistance.
Was resistance as specified?
0.8 ± 1
Go to Step 7Go to Step 6
6Replace glawplug.
Was measure completed?
ÐVerify repairGo to Step 7
71. Review all diagnostic procedures within this table.
2. If all procedures have been completed and no
malfunctions have been found, review/inspect the
following:

Visual/physical inspection

Tech 2 data

Freeze Frame data/Failure Records butter

All electrical connections within a suspected
circuit and/or system
3. If a problem is found, repair as necessary.
Was a problem found?
ÐVerify repair
Contact
Technical
Assistance

6E±217 4JX1±TC ENGINE DRIVEABILITY AND EMISSIONS
Throttle Body (TB)
Removal Procedure
1. Disconnect the negative battery cable.
2. Remove the cover of the intercooler.
035RW051
3. Remove the bolts and the left side bracket to the
intercooler.
4. Remove the air duct with bracket from the intercooler.
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5. Remove the throttle body assembly from the intake
manifold.
6. Disconnect the ITP sensor electrical connector.
Installation Procedure
NOTE: Do not use solvent of any type when you clean the
gasket surfaces on the intake manifold and the throttle
body assembly. The gasket surfaces and the throttle body
assembly may be damaged as a result.
If the throttle body gasket needs to be replaced,
remove any gasket material that may be stuck to the
mating surfaces of the manifold.

Do not leave any scratches in the aluminum casting.
1. Install the throttle body assembly to the intake
manifold and the air duct with bracket between
throttle body and intercooler.
Torque: 20 N´m (14 Ib ft)
035RW086
2. Connect the ITP sensor electrical connector and
throttle motor control connector.
3. Install the bracket to the intercooler.
4. Install the cover of intercooler.
5. Connect the negative battery cable.
Air Conditioning (A/C) Relay
Removal Procedure
1. Remove the fuse and relay box cover from under the
hood.
2. Consult the diagram on the cover to determine which
is the correct relay.
3. Pull the relay straight up and out of the fuse and relay
box.
Installation Procedure
1. Insert the relay into the correct place in the fuse and
relay box with the catch slot facing forward.
2. Press down until the catch engages.

An audible ªclickº will be heard.
3. Install the fuse and relay box cover.
Exhaust Gas Recirculation
(EGR) Vacuum Switch Valve
(VSV)
Removal Procedure
1. Disconnect the negative battery cable.

6E±226
4JX1±TC ENGINE DRIVEABILITY AND EMISSIONS
0018
Manifold Absolute Pressure (MAP) Sensor
The manifold absolute pressure (MAP) sensor responds
to changes in intake manifold pressure. The MAP sensor
signal voltage to the ECM varies from below 2 volts at idle
(high vacuum) to above 4 volts.
The MAP sensor is used to determine the following:

Boost pressure for injector control.

Barometric pressure (BARO).
If the ECM detects a voltage that is lower than the
possible range of the MAP sensor, DTC P0107 will be set.
A signal voltage higher than the possible range of the
sensor will set DTC P0108. An intermittent low or high
voltage will set DTC P1107 or DTC P1106, respectively.
The ECM can detect a shifted MAP sensor. The ECM
compares the MAP sensor signal to a calculated MAP
based on throttle position and various engine load factors.
If the ECM detects a MAP signal that varies excessively
above or below the calculated value, DTC P0106 will set.
Engine Control Module (ECM)
The engine control module (ECM) is located in the engine
room.
The ECM constantly observes the information from
various sensors. The ECM controls the systems that
affect vehicle performance. The ECM performs the
diagnostic function of the system. It can recognize
operational problems, alert the driver through the MIL
(Service Engine Soon lamp), and store diagnostic trouble
codes (DTCs). DTCs identify the problem areas to aid the
technician in making repairs.
ECM Function
The ECM supplies 5, 12 and 110 volts to power various
sensors or switches. The power is supplied through
resistances in the ECM which are so high in value that a
test light will not light when connected to the circuit. In
some cases, even an ordinary shop voltmeter will not give
an accurate reading because its resistance is too low.
Therefore, a digital voltmeter with at least 10 megohms
input impedance is required to ensure accurate voltage
readings. The ECM controls output circuits such as theinjectors, glow relays, etc., by controlling the ground or
the power feed circuit through transistors or through
either of the following two devices:

Output Driver Module (ODM)

Quad Driver Module (QDM)
ECM Components
The ECM is designed to maintain exhaust emission levels
to government mandated standards while providing
excellent driveability and fuel efficiency. The ECM
monitors numerous engine and vehicle functions via
electronic sensors such as the crankshaft position (CKP)
sensor, and vehicle speed sensor (VSS). The ECM also
controls certain engine operations through the following:

Fuel injector control

Rail pressure control
ECM Voltage Description
The ECM supplies a buffered voltage to various switches
and sensors. It can do this because resistance in the
ECM is so high in value that a test light may not illuminate
when connected to the circuit. An ordinary shop
voltmeter may not give an accurate reading because the
voltmeter input impedance is too low. Use a 10-megohm
input impedance digital voltmeter to assure accurate
voltage readings.
The input/output devices in the ECM include
analog-to-digital converters, signal buffers, counters,
and special drivers. The ECM controls most components
with electronic switches which complete a ground circuit
when turned ªON.º These switches are arranged in
groups of 4 and 7, called either a surface-mounted quad
driver module (QDM), which can independently control up
to 4 output terminals, or QDMs which can independently
control up to 7 outputs. Not all outputs are always used.
ECM Input/Outputs
Inputs ± Operating Conditions Read

Air Conditioning ªONº or ªOFFº

Engine Coolant Temperature

Crankshaft Position

Electronic Ignition

Manifold Absolute Pressure

Battery Voltage

Intake Throttle Position

Vehicle Speed

Fuel Temperature

Oil Temperature

Intake Air Temperature

EGR boost pressure

Oil rail pressure

Camshaft Position

Accelerator position
Outputs ± Systems Controlled

Exhaust Gas Recirculation (EGR)

Injector Control

QWS

6E±229 4JX1±TC ENGINE DRIVEABILITY AND EMISSIONS
Fuse and Relay Panel (Underhood Electrical Center) RHD
035RW109

6E±230
4JX1±TC ENGINE DRIVEABILITY AND EMISSIONS
Fuse and Relay Panel (Underhood Electrical Center) LHD
035RW108

WIPER/WASHER SYSTEM8B–1
WIPER / WASHER SYSTEM
CONTENTS
Service Precaution 8B–2. . . . . . . . . . . . . . . . . . . . . .
Windshield Wiper/Washer System 8B–2. . . . . . . . .
General Description 8B–2. . . . . . . . . . . . . . . . . . . . .
Windshield Wiper And Washer Switch 8B–2. . . . .
Removal and Installation 8B–2. . . . . . . . . . . . . . .
Windshield Wiper Motor 8B–2. . . . . . . . . . . . . . . . . .
Removal 8B–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 8B–2. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Windshield Washer Motor 8B–3. . . . . . . . . . . . . . . .
Removal 8B–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 8B–3. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Windshield Wiper Linkage 8B–4. . . . . . . . . . . . . . . .
Windshield Wiper Linkage and
Associated Parts 8B–4. . . . . . . . . . . . . . . . . . . . . .
Removal 8B–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 8B–4. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Windshield Wiper Arm/Blade 8B–5. . . . . . . . . . . . . .
Removal 8B–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 8B–5. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Windshield Wiper Blade Rubber 8B–6. . . . . . . . . . .
Removal 8B–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 8B–6. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rear Wiper/Washer System 8B–7. . . . . . . . . . . . . .
General Description 8B–7. . . . . . . . . . . . . . . . . . . . .
Rear Wiper and Washer Switch 8B–7. . . . . . . . . . .
Removal 8B–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 8B–7. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rear Wiper Motor 8B–8. . . . . . . . . . . . . . . . . . . . . . .
Removal 8B–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 8B–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . Alarm & Relay Control Unit 8B–9. . . . . . . . . . . . . . .
Removal 8B–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 8B–9. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rear Washer Motor 8B–9. . . . . . . . . . . . . . . . . . . . . .
Removal 8B–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 8B–9. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rear Wiper Arm/Blade 8B–10. . . . . . . . . . . . . . . . . . .
Removal 8B–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 8B–10. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rear Washer Nozzle 8B–10. . . . . . . . . . . . . . . . . . . . .
Removal 8B–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 8B–10. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rear Washer Nozzle Angle Adjustment 8B–10. . .
Rear Wiper Blade Rubber 8B–11. . . . . . . . . . . . . . . .
Removal and Installation 8B–11. . . . . . . . . . . . . . .
Headlight Wiper/Washer 8B–11. . . . . . . . . . . . . . . . .
General Description 8B–11. . . . . . . . . . . . . . . . . . . . .
Headlight Wiper and Washer Switch 8B–12. . . . . . .
Removal 8B–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 8B–12. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Headlight Wiper Arm & Blade 8B–13. . . . . . . . . . . . .
Removal 8B–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 8B–13. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Headlight Wiper Motor 8B–13. . . . . . . . . . . . . . . . . . .
Removal 8B–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 8B–13. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Headlight Washer Motor 8B–14. . . . . . . . . . . . . . . . .
Removal and Installation 8B–14. . . . . . . . . . . . . . .
Main Data and Specifications 8B–14. . . . . . . . . . . . .

8B–2WIPER/WASHER SYSTEM
Service Precaution
WARNING: I F S O E Q U IPPED WITH 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.
Windshield Wiper/Washer System
General Description
The circuit consists of the starter switch, windshield wiper
& washer switch, windshield wiper motor, windshield
washer motor and windshield intermittent relay.When the wiper & washer switch is turned on with the
starter switch on, the battery voltage is applied to the
wiper motor to activate the wiper.
The washer motor squirts glass cleaning fluid while the
washer switch is being pushed. The intermittent relay is
used to control motion of the wiper.
Windshield Wiper And Washer Switch
Removal and Installation
Refer to the Lighting Switch (Combination Switch) in
Lighting System section.
Windshield Wiper Motor
Removal
1. Disconnect the battery ground cable.
2. Disconnect the connector.
3. Remove 4 mounting bolts.
4. Remove the windshield wiper motor(1).
880RW007
Installation
To install, follow the removal steps in the reverse order.