1998 ISUZU TROOPER engine

MAINTENANCE AND LUBRICATION 0BÐ11
OIL VISCOSITY CHART FOR MANUAL TRANSMISSION AND TRANSFER CASE
APPLY ENGINE OIL
SAE 5W-30
SAE 15W-40,20W-40,20W-50
SAE 10W-30
SAE 40,50
ET-12 (Multi-grade) (Single grade)VISCOSITY GRADE - AMBIENT TEMPERATURE
SAE 30
µ25˚C
µ13˚Fµ10˚C
˚F˚C
˚F ˚C
˚F ˚C
˚F˚C
˚F
OIL VISCOSITY CHART FOR FRONT AXLE (Manual and Auto locking hub model)
AND REAR AXLE
APPLY GEAR OIL
SAE 75W-90
SAE 80W-140
SAE 80W-90
GA-06 (Multi grade)(Single grade)GEAR OIL VISCOSITY GRADE - AMBIENT TEMPERATURE
µ25˚C
µ13˚F˚C
˚F µ10˚C
˚F˚C
˚F ˚C
˚F ˚C
˚F
SAE 80W
SAE 75W
SAE 140
SAE 90

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

SERVICE INFORMATION 00 Ð 13
D08RY00133
ECM
(J2-11)
0.5 L/P 0.5 L/P
I-25
I-25
3
I-25 2
I-25 6
I-25
5
4
1H-1614
0.3R/G0.85G/R 0.85G/R
ILLUMINATION
CONTROLLER TAIL RELAY(4)
ENGINE
WARMING
SW
1.25B 0.5B
C-74C-741 2THERMO SWH-919
0.5G/W 0.5G/W
0.5 L/P
0.5G/B
H-265
H-4216
H-52
0.5B
H-1615

SERVICE INFORMATION 00 Ð 15
D08RY00135
ECM
(J2-11)
0.5 L/P
I-25
I-25
3
I-25 2
I-25 6
I-25
5
4
1H-166
0.3R/G0.85G/R 0.85G/R
ILLUMINATION
CONTROLLER TAIL RELAY(4)
ENGINE
WARMING
SW
1.25B 0.5B
C-74C-741 2THERMO SWH-2417
0.5G/W 0.5G/W
0.5 L/P
0.5G/B
H-2516
H-4216
H-52
0.5B
H-1615

00 Ð 16 SERVICE INFORMATION
TROUBLE POSSIBLE CAUSE CORRECTION
HEATING CYCLE TROUBLESHOOTING
No heating or
Insufficient heating.·Refer to ÒFAN CONTROL KNOB (FAN
SWITCH)Ó Troubleshooting.
·Check the engine coolant temperature
after warming up the engine and check
the thermostat. Replace as necessary.
·Add engine coolant as required.
·Check if the water hose to the heater
core is clogged, collapsed or twisted.
Repair or replace as necessary.
·Check water pump function. Repair or
replace as necessary.
·Clean or replace as necessary.
·Repair the temperature control link unit
or mode doors.
·Repair or adjust the control cables.
·Repair or replace as necessary.
·Refer to ÒCERAMIC HEATERÓ
Troubleshooting.
·Repair.
·Repair.
·Repair.
·Adjust. 1. Blower motor does not run, or
runs improperly.
2. Engine coolant temperature is
low.
3. Insufficient engine coolant.
4. Circulation volume of engine
coolant is insufficient.
5. Heater core clogged or
collapsed.
6. The heater core is not provided
with air sent from the blower
motor.
7. Duct connections defective or
unsealing.
8. Ceramic heater defective.
1. Cable attaching clip is not
correct.
2. Link unit of heater unit or
blower assembly defective.
1. Link unit of heater unit or
blower assembly defective
2. Control cable is not adjusted. Control knob moves
but mode door does
not operate.
The mode door
cannot be set to the
mode selected.

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 24 SERVICE INFORMATION
CHECKING REFRIGERANT SYSTEM
WITH MANIFOLD GAUGE
Conditions;
·Ambient temperature at approx. 25 ~30°C (77
~86°F)
·Run the engine at Idling
·A/C switch is ÒONÓ
·Run the blower motor at Ò4Ó (high) position
·Temperature control knob sets at ÒMAX COLDÓ
·Air source selector lever at ÒCIRCÓ
·Close the all doors
Normal pressures kpa (kgácm
2/ PSI);
Low-pressure side:
Approx. 147 Ð 294 (1.5 Ð 3.0 / 21 Ð 43)
High-pressure side:
Approx. 1373 Ð 1863 (14 Ð 19 / 199 Ð 270 )
Connect the manifold gauge
Low-pressure hose (LOW)~Suction side
High-pressure hose (HI)~Discharge side (Low side) (High side)