ignition ISUZU TROOPER 1998 Service Repair Manual

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THIS MALUAL INCLUDES THE FOLLOWING SECTIONS:
6VD1 / 6VE1
SECTION No. CONTRNTS
6A ENGINE MECHANICAL
6B ENGINE COOLING
6C ENGINE FUEL
6D1 ENGINE ELECTRICAL
6D2 IGNITION SYSTEM
6D3 STARTING AND CHARGING SYSTEM
6E ENGINE DRIVEABILITY AND EMISSIONS
6F ENGINE EXHAUST
6G ENGINE LUBRICATION
6H ENGINE SPEED CONTROL SYSTEM
6J INDUCTION

ABBREVIATIONS CHARTS
LIST OF AUTOMOTIVE ABBREVIATIONS WHICH MAY BE USED IN THIS MANUAL
A Ð Ampere(s)
ABS Ð Antilock Brake System
A/C Ð Air Conditioning
ACCEL Ð Accelerator
ACC Ð Accessary
Adj Ð Adjust
A/F Ð Air Fuel Ratio
AIR Ð Air Injection Reaction System
ALDL Ð Assembly Line Diagnostic Link
Alt Ð Altitude
AMP Ð Ampere(s)
ANT Ð Antenna
APS Ð Absolute Pressure Sensor
ASM Ð Assembly
A/T Ð Automatic Transmission/Transaxle
ATDC Ð After Top Dead Center
Auth Ð Authority
Auto Ð Automatic
BARO Ð Barometic
Bat Ð Battery
Bat+ Ð Battery Positive Terminal
Bbl Ð Barrel
BCM Ð Body Control Module
BHP Ð Brake Horsepower
BP Ð Back Pressure
BTDC Ð Before Top Dead Center
¡C ÐDegrees Celsius
Cat. Conv. Ð Catalytic Converter
cc Ð Cubic Centimeter
CCC Ð Computer Command Control
CCOT Ð Cycling Clutch Orifice Tube
CCP Ð Controlled Canister Purge
CID Ð Cubic Inch Displacement
CL Ð Closed Loop
CLCC Ð Closed Loop Carburetor Control
CO Ð Carbon Monoxide
Coax Ð Coaxial
Conn Ð Connector
Conv Ð Converter
CP Ð Canister Purge
CPS Ð Central Power Supply
Crank Ð Crankshaft
CTS Ð Coolant Temperature Sensor
Cu.In. Ð Cubic Inch
CV Ð Constant Velocity
Cyl Ð Cylinder(s)
C
3I Ð Computer Controlled Coil Ignition
DBM Ð Dual Bed Monolith
Diff Ð Differential
DIS Ð Direct Ignition System
Dist ÐDistributor
DOHC Ð Double Overhead Camshaft
DVM Ð Digital Voltmeter (10 meg.)
DVOM Ð Digital Volt Ohmmeter
DVDV Ð Differential Vacuum Delay Valve
EAC ÐElectric Air Control
EAS Ð Electric Air Switching
EBCM Ð Electronic Brake Control Module
ECC Ð Electronic Climate Control
ECM Ð Electronic Control Module
ECU Ð Electronic Control Unit
Ð Engine Calibration Unit (PROM)
EECS Ð Evaporative Emission Control System
EFE Ð Early Fuel Evaporation
EFI Ð Electronic Fuel Injection
EGR Ð Exhaust Gas Recirculation
EGR/TVS Ð Exhaust Gas Recirculation/Thermostatic
Vacuum Switch
ELC Ð Electronic Level Control
ESC Ð Electronic Spark Control
EST Ð Electronic Spark Control
ETR Ð Electronically Tuned Receiver
EVRV Ð Electronic Vacuum Regulator Valve (EGR)
Exh Ð Exhaust
¡F Ð Degrees Fahrenheit
FF Ð Front Drive Front Engine
FL Ð Fusible Link
FLW Ð Fusible Link Wire
FRT ÐFront
FWD Ð Front Wheel Drive
4WD Ð Four Wheel Drive
4x4 Ð Four Wheel Drive
4 A/T Ð Four Speed Automatic Transmission/Transaxle
Gal Ð Gallon
Gen Ð Generator
Gov Ð Governor
g Ð Gram
Harn Ð Harness
HC Ð Hydrocarbons
HD ÐHeavy Duty
HEI Ð High Energy Ignition
Hg Ð Mercury
HiAlt Ð High Altitude
HVAC Ð Heater-Vent-Air Conditioning
IAC Ð Idle Air Control
IC Ð Integrated Circuit
ID Ð Identification
Ð Inside Diameter
IDI Ð Integrated Direct Ignition
IGN Ð Ignition
ILC Ð Idle Load Compensator
INJ ÐInjection
IP Ð Instrument Panel
IPC Ð Instrument Panel Cluster
INT Ð Intake
J/B Ð Junction Block
km Ð Kilometers
km/h Ð Kilometer per Hour
kPa Ð KiloPascals
KV Ð Kilovolts (thousands of volts)
KW Ð Kilowatts
0AÐ12 GENERAL INFORMATION

00 Ð 18 SERVICE INFORMATION
BLOWER MOTOR DOES NOT RUN
·IS NO. C-19 (25A) FUSE OK?
·IS BLOWER RELAY (B-36) OK?
YESNO
REPLACE
NO
REPLACE
NO
REPLACE
NO
REPLACE CONTROL LEVER ASSEMBLY
NO
REPLACE
NO
OPEN CIRCUIT BETWEEN NO. C-19
(25A) FUSE AND NO. B5-1 (NO. B5-2;
RHD)
YES
·IS RESISTOR OK?
YES
·IS FAN CONTROL KNOB (FAN SWITCH) OK?
YES
·IS BLOWER MOTOR OK?
YES
·TURN THE IGNITION SWITCH ÒONÓ (ENGINE IS
RUNNING)
·FAN CONTROL KNOB (FAN SWITCH) ÒONÓ
·CHECK TO SEE IF BATTERY VOLTAGE IS PRESENT
AT CHASSIS SIDE CONNECTOR TERMINAL NO. B5-1
(NO. B5-2; RHD)
YES
POOR GROUND OR OPEN CIRCUIT EITHER BETWEEN
CHASSIS SIDE CONNECTOR TERMINAL NO. B5-2
(NO. B5-1; RHD) AND NO. I-41-2 OR NO. I18-1 AND BODY
GROUND NO. B-2 (NO. B-1; RHD)

SERVICE INFORMATION 00 Ð 21
CERAMIC HEATER DOES NOT OPERATE
·ARE NO. FL-3 (40A) AND NO. C-20 (10A) OK?
YESNO
REPLACE
REPLACE
REPLACE
REPLACE
·ARE A/C AND CERAMIC HEATER RELAYS OK?
YESNO
·ARE BLOWER MOTOR AND FAN SW. OK?
YESNO
·IS FULL HOT SW. OK?
·DOES TEMP. CONTROL LINK (HEATER UNIT)
OPERATE CORRECTLY?
YESNO
REPLACE·TURN THE IGNITION SW. ÒONÓ (ENGINE IS RUNNING)·CERAMIC HEATER ÒONÓ
·CHECK TO SEE IF BATTERY VOLTAGE IS PRESENT AT
CHASSIS SIDE CONNECTOR TERMINAL NO. B48-1
YESNO
OPEN CIRCUIT·CHECK TO SEE IF BATTERY VOLTAGE IS PRESENT AT
CHASSIS SIDE CONNECTOR TERMINAL NO. B48-2
YESNO
CERAMIC HEATER DEFECTIVE·CHECK THE CERAMIC HEATER OR CERAMIC HEATER-
RELATED HARNESS FOR A POOR GROUND AND REPAIR
IT AS NECESSARY
YESNO
·DOES CONTROL LEVER CABLE OPERATE CORRECTLY?·IS THERMO RELAY OK?
YESNO
NOYES
ADJUST OR REPLACEREPAIR OR REPLACE
TEMP. CONTROL UNIT

00 Ð 22 SERVICE INFORMATION
CERAMIC HEATER DOES NOT STOP
WHEN THE IGNITION SW. ÒOFFÓ, DOES CERAMIC HEATER
STOP?
YESNO
CERAMIC HEATER RELAY DEFECTIVE·SHORT CIRCUIT BETWEEN CHASSIS SIDE RELAY TERMINAL
NO. X12-3 AND CHASSIS SIDE CONNECTOR TERMINALNO. B49-1

00 Ð 32 SERVICE INFORMATION
MAGNETIC CLUTCH DOES NOT RUN
·ARE NO. C-20 (10A) FUSE AND NO. C-19 (25A) FUSES OK?
YESNO
REPLACE·ARE HEATER & A/C (B-36) AND THERMOSTAT (X-5)
RELAYS OK?
YESNO
REPLACE·IS PRESSURE SWITCH (DUAL PRESSURE SWITCH) OK?
YESNO
SWITCH DEFECTIVE OR INSUFFICIENT REFRIGERANT·ARE A/C SWITCH AND FAN CONTROL KNOB (FAN
SWITCH) OK?
YESNO
REPLACE·TURN THE IGNITION SWITCH ÒONÓ (ENGINE IS
RUNNING)
·A/C SWITCH AND FAN CONTROL KNOB (FAN SWITCH
ÒONÓ
·CHECK TO SEE IF BATTERY VOLTAGE IS PRESENT AT
CHASSIS SIDE CONNECTOR TERMINAL NO. E3-1
NOYES
MAGNETIC CLUTCH DEFECTIVE ·CHECK TO SEE IF BATTERY VOLTAGE IS PRESENT AT
CHASSIS SIDE CONNECTOR TERMINAL NO. C25-1
YESNO
OPEN CIRCUIT BETWEEN NO. C-20 (10A) FUSE AND
NO. C25-1·DISCONNECT THERMO RELAY (X-5)
·CHECK TO SEE IF BATTERY VOLTAGE IS PRESENT AT
CHASSIS SIDE RELAY TERMINAL NO. X5-2
YESNO
OPEN CIRCUIT BETWEEN NO. C25-2 AND NO. X5-2 ·CHECK TO SEE IF VOLTAGE (APPROX. 10V) IS PRESENT
CHASSIS SIDE RELAY TERMINAL NO. X5-1 AND
NO. X5-3
CONTINUED NEXT PAGE

1BÐ74 AIR CONDITIONING
FUNCTIONS AND FEATURES
¥ Automatic interior temperature control
This function enables to maintain the interior temperature at the level specified from the temperature
control switch despite of changes in factors such as vehicle speeds, outside air temperature and number
of passengers.
¥ Maximum cooling and heating function
You can select FC (Full cool, namely maximum cooling temperature) or FH (Full heat, maximum heating
temperature) from the temperature control lever.
¥ Automatic air flow control
Air flow is automatically and consecutively fine tuned according to the specified interior temperature and
changes in aperture of the heater unit mix door.
¥ Mode (blow port) control
This function automatically selects either one of the VENT, BI-LEVEL, FOOT or DEP mode for the blow
port according to changes of temperature on the blow port. Using the mode switch allows you to select a
desired blow port manually.
¥ Intake (switching between the fresh air intake and circulation of interior air) control
The intake (switching between fresh air intake and circulation of interior air) mode automatically selects
either FRESH (fresh air intake), MIX or RECIRC (interior air circulation) according to changes of the blow
port temperature. Using the intake switch allows you to select a desired intake port manually (in the
manual operation, FRESH and RECIRC modes alone are available). Pressing the DEF (defrost) mode
switch selects the FRESH (fresh air intake).
¥ Cooler start-up timing control
This function is used for maintaining the air flow at "LOW" level until the evaporator is sufficiently cooled
down. It is intended to prevent a large volume of hot air being blowing into inside of a vehicle when the
cooler is turned on in hot summer season.
¥ Heater start-up timing control
This function is used for maintained the air flow at "LOW" level and also for maintaining the defrost
mode until temperature of coolant in the heater core is sufficiently heated. It is intended to prevent a
large volume of cool air being blown into inside of a vehicle when the heater is turned on in cold winter
season.
¥ Solar radiation quantity offset control
The photodiode on the solar radiation sensor determines solar radiation quantity accurately to offset
interior temperature quickly.
¥ Switch position storing function
This function is used for storing switch positions being selected in the immediately preceding operation,
namely the last time the ignition has been turned off. It simplifies the setup procedures when restarting
the system.
¥ Self-diagnosis function
The self-diagnosis function turned on from the panel switch makes your troubleshooting easier (for detail
of this function, refer to the section titled "Self-Diagnosis").

AIR CONDITIONING 1BÐ91
6. Heating Start Timing Control
When the automatic heater/air conditioner is
started, heating is turned on under following
conditions.
·The detected temperature of thermo unit is
136¡F or less.
·The temperature setting signal and the total
signal by each sensor meet the condition of
heating.
When the detected temperature by the coolant
temperature sensor is 136¡F or less the blower
fan motor is set to work at low speed and the
"DEF" mode is selected.
When the detected temperature by the coolant
temperature sensor is 77¡F or more, the blow
mode changes automatic control. And the
blower fan speed is controlled to be lineally up
from "LO" to "MAX HI".7. Cooling Start Timing Control
When the automatic heater/air conditioner is
started, cooling is turned on under following
conditions.
·The in car sensor is 86¡F or more.
·The temperature setting signal and the signals
from each sensor meet the specified condition.
The blower fan speed is set to "LO" for
maximum 7 seconds when cooling start
conditions meet, and then, is controlled to be
lineally up to "MAX HI" by 5.32%/S.
Ignition swich
"ON"
Time
Blower voltage to turn
on the cooling
7 SEC maximum3 SEC
100%
(MAX HI)
33.5%
(LO)5.32%/S
C06RY00001
33.5%
(LO)
2.63%/S
Mode
DEF
Auto
Mode
100%
(MAX HI)
Ignition
switch "ON"
Thermo Unit 58¡C(Gasoline)
52¡C(Diesel) Time
840RY00009

1BÐ94 AIR CONDITIONING
Chart "A" : Check of Auto Amplifier Power Supply System
NOHarness disconnection or improper grounding.
NOHarness disconnection or improper grounding.
NOHarness disconnection or trouble on lighting
switch.
NOHarness disconnection or improper grounding.
Turn off ignition switch.
Power supply system is free of
trouble.
YES YES
YES YES
Is battery voltage present between chassis
harness connector terminal No.7
and ground?
I-32
Is battery voltage present between
chassis harness connector No.8
and ground?
I-32
Are chassis harness connector No.16
and body ground conducted?
B-18I-32
Turn on ignition switch (engine is started).
Turn on lighting switch.
Is battery voltage present between chassis
harness connector No.10 and
ground?
I-32

AIR CONDITIONING 1BÐ97
TROUBLESHOOTING WITH SELF-DIAGNOSIS FUNCTION
1. Overview of Self-Diagnosis Function
The self-diagnosis is implemented in 3 steps for each target. For detail of check procedure contained in
each step, refer to the relevant section of "Check Procedure by Failed Location" listed in the Self-
Diagnosis Operation Procedure.
For turning on the self-diagnosis function and switching of the check step, refer to the flow chart given
below. You can reset the self-diagnosis function by turning the ignition switch off or turning the DEF
switch on for 3 seconds.
2. Self-Diagnosis Operation Procedure
While holding both the Auto switch and the DEF switch on the
automatic heater/air conditioner panel, turn the IG off and then
on.

Does the A/C LED flash every 0.5 second interval?
Press the A/C switch once.
(The past trouble
diagnosing function will
be turned on.)

Does the A/C LED flashes every 0.5 seconds?

Does each output equipment functions normally according to
operation of the temperature setting lever?
Press the DEF switch for 3
seconds consecutively or turn on
and off the IG.
Failure on the
output equipment
or the harness.
Preparations
(1) Set the IG to the OFF mode.
(2) Apply 60W bulb light to the sun sensor.
(3) Set the temperature setting lever on the automatic heater/air
conditioner panel to the center position (25C).
(4) Set the fan switch on the same panel to the Auto position.
End of the self-diagnosis.(The current trouble diagnosing function will be turned on
approximately in 10 seconds.)
YESNO
YESNO
NO
YES
Refer to *1.
Refer to *2.