1998 ISUZU TROOPER diagram

SERVICE INFORMATION 00 Ð 3
TROUBLESHOOTING
CONTENTS
PAGE
Circuit Diagram.........................................................00Ð 4
Heating Cycle Troubleshooting............................................00Ð16
Fan Control Knob (Fan Switch)............................................00Ð17
Blower Motor Does Not Run............................................00Ð18
Blower Motor Does Not Run In Certain Position............................00Ð19
Blower Motor Does Not Stop at ÒOFFÓ Position............................00Ð19
Ceramic Heater.........................................................00Ð20
Ceramic Heater Does Not Operate.......................................00Ð21
Ceramic Heater Does Not Stop..........................................00Ð22
Air Conditioning Cycle Troubleshooting.....................................00Ð23
Checking Refrigerant System with Manifold Gauge.........................00Ð24
Magnetic Clutch........................................................00Ð27
6VD1/6VE1 Engine....................................................00Ð27
4JG2 Engine.........................................................00Ð31
4JX1 Engine..........................................................00Ð34
Condenser Fan..........................................................00Ð37
Condenser Fan Does Not Run...........................................00Ð38
Condenser Fan Does Not Stop..........................................00Ð39
Compressor Troubleshooting.............................................00Ð40
Individual Inspection.....................................................00Ð41

00 Ð 4 SERVICE INFORMATION
CIRCUIT DIAGRAM
6VD1/6VE1 (RHD)
0.5 LG
0.5 LG
B -1 BODY-RH
BODY-LH
FRAME
ENG.5B
BODY
8B / R
8 B
+
_
P - 6
30B
P - 1
P - 5
P - 10
P - 7
P - 2
FL-1
80A MAINFL-4
30A CONDENSER FAN
F-6
15A RR COOLER
I-232
I-236 A/C SW
BLOWER
MOTOR
0.3 G/Y
I-42 I-42
I-421 3
216
0.5 LG
1
5W
B-190.5 BR
0.5 BR
0.5 P/G H-24 H-5113 1
H-167
H-16
2 L/R
I-41
I-18
I-18
I-18
I-18 1.25 L/O
1.25 L/Y
0.85 L/W 3
36
5
2 4
1 6
FAN SW HEATER BEZEL
ILLUMINATION
I-23 I-23
I-18
I-183
5
4
10.3 R/G0.85 G/R
ILLUMINATION
CONTROLLER (3) RELAY ; TAIL (4)
H-201
2 B
2BLOWER
RESISTOR
I-41
I-41
I-41
I-41
2L/B
2 B
1.25B
M
B-52
1B-5
B-361
B-36
B-36 B-362
34
I-23
10.85W/G
3L/R 3LC-19
25A BLOWER
0.3B
ELECTRONIC
THERMOSTAT
5W 3W
0.5 BR
1.25 L/O
0.5 LG/Y
0.3 G/Y 0.3 G/Y RELAY ;
HEATER AND
A/C
C-20 10A
AIR CON.
0.5 BR 0.5 BR
RELAY;STARTER (1)
5W
H-14
16
H-26
2L/B
2
H-20
H-1310
0.3 G/Y
0.5 LG
D08RY00128

1B Ð 2 AIR CONDITIONING
Full Automatic Air Conditioning System....................................1BÐ 60
General Description.....................................................1BÐ 60
Full Automatic Air Conditioner Part Configuration.........................1BÐ 60
Circuit Diagram......................................................1BÐ 62
Function and Features.................................................1BÐ 74
Full Automatic Air Conditioner Block Diagram.............................1BÐ 75
Air Conditioning Parts.................................................1BÐ 76
Control Panel Layout..................................................1BÐ 80
Air Control Functions.................................................1BÐ 81
Operation and Function of Control Panel Switches.........................1BÐ 82
Overview of Construction, Movement and Control of Major Parts of Full Automatic
Air Conditioner System................................................1BÐ 84
Overview of Automatic Control of Full Automatic Air Conditioner............1BÐ 88
Troubleshooting........................................................1BÐ 92
Troubleshooting, Its Overview and Procedures............................1BÐ 92
Performance and Movement Checklist for Automatic Air Conditioner Related
Parts...............................................................1BÐ 95
Troubleshooting with Self-Diagnosis Function............................1BÐ 97
Inspection by Failed Location.............................................1BÐ100
Inspection of the Sensors..............................................1BÐ100
Inspection of the Intake Actuator System.................................1BÐ104
Inspection of the Mix Actuator System...................................1BÐ107
Inspection of the Mode Actuator System.................................1BÐ110
Inspection of the Fan Motor System.....................................1BÐ113
Inspection of the Magnet Clutch System.................................1BÐ118
Inspection of the Air Conditioner Room Temperature Setup System..........1BÐ123
Individual Inspection..................................................1BÐ124
On-Vehicle Service......................................................1BÐ126
Power Transistor.....................................................1BÐ126
Automatic Air Conditioner Control Unit..................................1BÐ126
In Car Sensor........................................................1BÐ127
Ambient Sensor......................................................1BÐ127
Sun Sensor..........................................................1BÐ128
Electronic Thermostat.................................................1BÐ128
Mode Actuator.......................................................1BÐ129
Mix Actuator.........................................................1BÐ129
Intake Actuator......................................................1BÐ130

AIR CONDITIONING 1B Ð 53
Switch Vehicle Motor Resistor15 54 (Vehicle) (Motor)0.85yRW 0.85yB
0.85yRB
(Resistor) (Switch)
0.5yLG
0.85yRG
0.85yWR 2
3
4
12yLO
3yMI
4yHI
WIRING DIAGRAM
D08RY00303

1BÐ62 AIR CONDITIONING
CIRCUIT DIAGRAM
6VE1 (RHD)
B-5
BLOWER
MOTOR2
B-5
1
I-51
3I-51
I-51I-51
MAX HI
RELAY POWER
TRANSISTORI-50
I-50
4
H-202
H-26
10
1
3
H-20
121 2L/B
0.5P/G
12
I-32
16 I-32
P-2
0.85W/G5W
5W 0.5R/W
0.3B0.5R/W 0.3R/W
TAIL RELAY(4) ILLUMINATION
CONTROLLER0.5G/R 0.85G/R
1.25B
1.25B1.25B
0.5B
9 I-32 5W 3W
BATT
FL-1
80A
MAIN4B-36
33L/R
C-19 25A
BLOWERC-20 10A
AIR CON
3L 2L/B
0.3BR
0.5BR0.3BR 2/B 0.3GR
0.3GR/L0.5L/B
2/B
B-36
20
H-27 2
B-36H-14
1
B-36HEATER & A/C RELAY
STARTER RELAY(1)
H-141
H-1310
I-328
H-269
10 C-16
10A CLOCK ROOM
BODY-RHBODY-LH
B-18
B-19
B-1
AUTO A/C CONTROL UNITAUTO A/C CONTROL UNIT
I-3217
14 35 2112 337
I-32
22
29 6I-331 H-20
14
H-16
M
192B
I-33
2I-50
D08RY00118

AIR CONDITIONING 1BÐ75
FULL AUTO display
INTAKE indication
(LED)
(switching between
fresh and interior air)
MODE indication
(LED) (Blow port)
AC display (LED)
FAN indication (LED)
FAN KNOB
AUTO SET
REC FRESH SWITCH
TEMP LEVER
(temperature control)
MODE SWITCH
(blow port selection)
AC SWITCH
IN CAR SENSOR
AMBIENT SENSOR
SUN SENSOR
DUCT SENSOR
MIX ACTUATOR
POTENTIOMETER
MODE ACTUATOR
POTENTIOMETER
AIR MIX DOOR
MODE DOOR
INTAKE ACTUATOR
RECINTAKE DOOR
FAN MOTORPOWER
TRANSISTOR
AUTOMATIC HEATER/AIR CONDITIONER CONTROL UNIT (with the built-in micro-computer)
MAX HI RELAY
PRESSURE
SWITCHAIR CONDITIONER
THERMO RELAY
COMPRESSOR
SWITCH MAGNET
CLUTCH
PCM
PRESSURE
SWITCHAIR CONDITIONER
THERMO RELAYMAGNET
CLUTCH
(4JX1engine)
MIX FRESH
FULL AUTOMATIC AIR CONDITIONER BLOCK DIAGRAM
F01RY00009

4B1±1 DRIVE LINE CONTROL SYSTEM (SHIFT ON THE FLY)
DRIVELINE/AXLE
DRIVELINE CONTROL SYSTEM (SHIFT ON THE FLY)
CONTENTS
Service Precaution 4B1±1. . . . . . . . . . . . . . . . . . . . . .
Shift on the Fly System (Lever Type) 4B1±2. . . . . . .
Outline of Shift on the Fly System
(Lever Type) 4B1±2. . . . . . . . . . . . . . . . . . . . . . . . . . .
Shift on the Fly Vacuum Piping and Electric
Equipment (For Lever Control Type) 4B1±3. . . . . .
Vacuum Piping Diagram 4B1±3. . . . . . . . . . . . . . . .
Inspection and Repair 4B1±4. . . . . . . . . . . . . . . . . .
Shift on the Fly System (Push Button Type) 4B1±7.
Outline of Shift on the Fly System
(Push Button Type) 4B1±7. . . . . . . . . . . . . . . . . . . . Functions of Indicator Lamp 4B1±11. . . . . . . . . . . . . . .
Diagnosis 4B1±11. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Front Axle Diagnosis 4B1±30. . . . . . . . . . . . . . . . . . .
Shift on the Fly Vacuum Piping and Electric
Equipment (For Push Button Type) 4B1±32. . . . . . . .
Vacuum Piping Diagram 4B1±32. . . . . . . . . . . . . . . .
Inspection and Repair 4B1±33. . . . . . . . . . . . . . . . . .
4WD Control Unit (For Push Button Type) 4B1±36. .
4WD Control Unit Associated Parts 4B1±36. . . . . .
Removal 4B1±37. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 4B1±37. . . . . . . . . . . . . . . . . . . . . . . . . . . .
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.

4B1±3 DRIVE LINE CONTROL SYSTEM (SHIFT ON THE FLY)
Shift on the Fly Vacuum Piping and Electric Equipment
(For Lever Control Type)
Vacuum Piping Diagram
C04RW015
VSV Assembly, Actuator Assembly
412RS032
Vacuum Tank
412RS033