1998 ISUZU TROOPER clutch

00 Ð 30 SERVICE INFORMATION
YESNO
REPAIR AN OPEN CIRCUIT BETWEEN THE
FUSE C-20 AND X7-1 (OR X7-2).·DIS CONNECT THE MAGNETIC CLUTCH CONNECTOR E3.
·CONNECT THE BATTERY WITH MAGNETIC CLUTCH SIDE
CONNECTOR E3-1.
·DOES THE MAGNETIC CLUTCH WORK?
YESNO
NO
REPAIR OR REPLACE THE MAGNETIC CLUTCH.·IS THERE CONTINUITY BETWEEN HARNESS SIDE CON-
NECTOR X7-4 AND E3-1?
YES
REPAIR AN OPEN CIRCUIT.
REPAIR AN OPEN CIRCUIT.
REPAIR AN OPEN CIRCUIT.
·IS THERE CONTINUITY BETWEEN HARNESS SIDE CON-
NECTOR X7-3 AND PCM C1-B14?
YESNO
NO
·IS THERE CONTINUITY BETWEEN HARNESS SIDE CON-
NECTOR X5-4 AND PCM C3-E15?
YES
REPLACE THE PCM.

SERVICE INFORMATION 00 Ð 31
4JG2 ENGINE
123
45 6
RELAY; A/C
B-36C-20
(LHD) 10A
A/C FL-1
80A
MAIN
1
2
B-2
C-25
2
4
X-5
1
3
4
13
24
1
A/C SW.
FAN SW.
I-23
PRESSURE
SW.
RELAY;
THERMO
B-2
C-25E-3I-23
BATTERY
3
1
2ELECTRONIC
THERMOSTAT
1
E-3
MAGNETIC
CLUTCHMg
OFF
I-18
2
6
1
321123
12
34
121
213
5 46
I-18
X-5
B-1
(LHD)
(RHD)
B-1
1
2 34
W/ CONDENSER
FAN
I-42
I-42B-36
D08RY00169

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

00 Ð 34 SERVICE INFORMATION
4JX1 ENGINE
123
45 6
RELAY; A/C
B-36C-20
10A
A/C FL-1
80A
MAIN
1
2
B-2
C-25
2
4
X-5
1
3
4
13
24
1
A/C SW.
FAN SW.
I-23
PRESSURE
SW.
RELAY;
THERMO
B-2
C-25I-23
BATTERY
1
E-27
MAGNETIC
CLUTCHMg
OFF
I-18
2
6
1
321123
12
34
12
213
5 46
I-18
X-5
B-1(LHD) (RHD)
3
1
2ELECTRONIC
THERMOSTAT
I-42
B-1
1
2 34
W/ CONDENSER
FAN
I-42B-36
E-27
11
D08RY00170

SERVICE INFORMATION 00 Ð 35
MAGNETIC CLUTCH DOES NOT RUN
·TURN THE STARTER SWITCH ON AND START THE
ENGINE.
·TURN THE FAN SWITCH ON.
·DOES THE BLOWER MOTOR RUN?
YESNO
REFER TO THE DIAGNOSIS PROCEDURE FOR
ÒBLOWER MOTOR DOES NOT RUNÓ.·IS THE FUSE C-20 (10A) NORMAL?
YESNO
REPLACE THE FUSE.·DISCONNECT THE A/C SWITCH CONNECTOR AND
REMOVE THE A/C SWITCH.
·IS THE A/C SWITCH NORMAL?
YESNO
YESNO
REPAIR AN OPEN CIRCUIT BETWEEN THE
FUSE C-20 AND I23-2.·REINSTALL THE A/C SWITCH AND DISCONNECT THE DUAL
PRESSURE SWITCH (OR TRIPLE PRESSURE SWITCH) CON-
NECTOR C25.
·TURN THE A/C SWITCH ON.
·IS THE BATTERY VOLTAGE APPLIED AT HARNESS SIDE
CONNECTOR C25-1?
YESNO
REPLACE THE SWITCH.·RECONNECT THE CONNECTOR C25 AND DISCONNECT THE
A/C THERMO RELAY CONNECTOR X5.
·IS THERE CONTINUITY BETWEEN HARNESS SIDE CONNEC-
TOR C25-2 AND X5-1?
YESNO
REPAIR AN OPEN CIRCUIT BETWEEN I23-6
AND C25-1.·IS THE DUAL PRESSURE SWITCH (OR TRIPLE PRESSURE
SWITCH) NORMAL?
YESNO
REPAIR OR REPLACE THE SWITCH.·IS THE BATTERY VOLTAGE APPLIED AT HARNESS SIDE
CONNECTOR I23-2?

00 Ð 36 SERVICE INFORMATION
·IS THE BATTERY VOLTAGE APPLIED AT HARNESS SIDE
CONNECTOR X5-2?REPAIR AN OPEN CIRCUIT.
YESNO
·IS THE A/C THERMO RELAY NORMAL?REPAIR AN OPEN CIRCUIT BETWEEN THE
FUSE C-20 AND X5-2.
YESNO
·DISCONNECT THE ELECTRONIC THERMOSTAT CONNEC-
TOR I42.
·IS THE BATTERY VOLTAGE APPLIED AT HARNESS SIDE
CONNECTOR I42-3?
YESNO
·IS THERE CONTINUITY BETWEEN HARNESS SIDE CON-
NECTOR X5-3 AND I42-1?REPAIR AN OPEN CIRCUIT BETWEEN I23-6
AND I42-3.
YESNO
REPAIR AN OPEN CIRCUIT.
YESNO
·IS THERE CONTINUITY BETWEEN HARNESS SIDE CON-
NECTOR I42-2 AND THE GROUND?REPAIR AN OPEN CIRCUIT.
REPLACE THE RELAY.
·DIS CONNECT THE MAGNETIC CLUTCH CONNECTOR E27.
·CONNECT THE BATTERY WITH MAGNETIC CLUTCH SIDE
CONNECTOR E27-1.
·DOES THE MAGNETIC CLUTCH.
YESNO
REPAIR OR REPLACE THE MAGNETIC CLUTCH.·REPAIR AN OPEN CIRCUIT BETWEEN X5-4 AND E27-1.

00 Ð 40 SERVICE INFORMATION
1. Defective rotor/piston
2. Defective bearing (DKS-15CH)
3. Defective shaft
1. Defective bearing
2. Defective clutch
3. Clearance between drive plate
and pulley not standard
1. Defective gasket
2. Defective rotor/reed valve
3. Defective trigger valve/suction
valve
1. Defective rotor/piston
2. Defective shaft
3. Rotating parts seized due to
insufficient oil
1. Defective seal
2. Defective O-ringReplace compressor/cylinder and
shaft assembly
Replace cylinder and shaft assembly
Replace compressor/cylinder and
shaft assembly
Replace magnetic clutch
Replace magnetic clutch
Adjust the clearance or replace
magnetic clutch
Replace compressor/gasket
Replace compressor/valve plate
Replace compressor/suction valve
Replace compressor/cylinder and
shaft assembly
Replace compressor/cylinder and
shaft assembly
Replace compressor
Replace compressor/shaft seal
Replace Noise from compressor
Noise from magnetic
clutch face
Insufficient cooling
Not rotating
Oil and/or gas leakage 1
2
3
4
5
ITEM PROBLEM POSSIBLE CAUSES CORRECTION
COMPRESSOR TROUBLESHOOTING

00 Ð 42 SERVICE INFORMATION
TRIPLE PRESSURE SWITCH (W/CONDENSER FAN)
43
12
1) Disconnect the connector and check for continuity
between pressure switch side connector terminal.
2) Reconnect the connector to activate the A/C switch,
and check to see if there is continuity between the
chassis side connectors and the fan operates.
[A/C OFF]
[A/C ON]
Terminal No. Control Continuity
1- 2Magnetic Clutch Continuity
3- 4Condenser Fan No Continuity
Terminal
Refrigerant Pressure Continuity Fan
No.
1079±98 kPa No
OFF
(11.0±1.0 kgácm
2/ 156±14 psi) Continuity
3- 4
1471±98 kPa
Continuity ON
(15.0±1.0 kgácm
2/ 213±14 psi)
BLOWER MOTOR
1
2
1) Disconnect the blower motor (B-5) connector from
the blower motor.
2) Connect the battery positive terminal to the No. 1
(NO.2; RHD) terminal of the blower motor and
negative to the No. 2 (NO. 1; RHD).
3) Be sure to check to see if the blower motor operates
correctly.
Terminal Normal
SW. No.12346Operating
position Resistance
2.4W
0.90W
0.28W
Ð 1
2
3
4
RESISTOR
14263
2
Motor3641
432
(SW.position) (Connector
terminal)
1
1) Disconnect resistor (I-41) connector.
2) Check for continuity and resistance between the
terminals of the resistor.