Isuzu Trooper (1998-2002 year). Service manual — part 44
AIR CONDITIONING 1B–117
Chart D: Fan Does Not Stop
NO
Replace the power transistor.
NO
Replace the relay.
YES
NO
YES
Turn on the ignition switch (the engine is
started).
YES
Is the power transistor performance
normal? (Refer to the later section on
"Check Up".)
Is the MAX HI relay performance
normal? (Refer to the later section on
"Check Up".)
Is the battery voltage present between
the chassis harness side connector
terminals No.1
and No.3
?
I-51
I-51
The chassis harness side connector
terminals No.1
and No.2
, or
No.1
and No.1
is short
circuited.
I-50
B-5
I-51
B-5
Failure on the automatic heater/air
conditioner control unit. Or, the harness
line is short circuited between the chassis
harness side connector terminals No.3
and No.12
.
I-32
I-51
1B–118 AIR CONDITIONING
Inspection of the Magnet Clutch System
6VE1 Engine
I-32
C-1
C-3
I-33
E-3
E-19
1 2 3 4 5 6 7 8
9 10 11 12 13 14 15 16
1
11
2
12
3
13
4
14
5
15
6
16
7
17
8
18
9
19
10
20
B-19
C-25
A
2
B-36
1
H-14
C-19
25A
BLOWER
MOTOR
C-20
10A
A/C
FL-1
80A
MAIN
Heater
Relay
1
B-36
10
H-13
0.3
B
0.85
W/G
0.85
W/R
3.0
W
3.0
L/R
0.5
BR
1.25
B
B-19
BODY-LH
3
B-36
4
B-36
BATT.(+)
Blower
Motor
Intake
Actuator
STARTER
RELAY(1)
0.5
LG
0.5
BR
0.5
BR
0.5
G/W
0.5
P/G
0.5
P/G
0.5
G/O
0.5
G/O
PCM
(C3-E15)
31
13
COMP-F/B
7
0.5
BR
0.5
BR/Y
0.3
G/B
0.5
G/B
0.5
BR/Y
0.5
BR
Triple
Pressure
Switch
0.5
BR
A
A/C
Thermo Relay
Auto A/C Control Unit
3
X-5
16
H-16
17
H-16
14
I-32
18
I-33
1
X-5
13
H-24
12
H-41
2
1
C-25
C-25
4
X-5
X-5
2
X-5
7
H-16
A/C
Compressor
Relay
Magnetic
clutch
1
X-7
3
X-7
4
X-7
2
X-7
PCM
(C-1-B14)
E-3
9
1
H-6
7
H-41
5
H-41
Engine
Coolant
Temperature
Sensor
ENGINE COOLANT
TEMPERATURE GAUGE
0.5
Y/B
0.5
Y/B
0.5
Y/B
E-19
11
1
H-6
1
H-24
I-33
4
B-36
X-5
X-7
H-14
1
2
1
2
H-16
H-24
H-13
H-6
H-41
1
2
3
4
1 2
1
1
1
3
6
2
5
1
4
1
2
3
4
5
6
10 9 8 7 6
5 4 3 2 1
2221201918
1514131211
17
16
1 2 3 4 5
1112131415
6 7 8 9 10
1819202122
16
17
6
H-41
4
3
2
1
8
7
6
5
12 11 10
9
16 15 14 13
1
2
3
4
5
6
7
8
9
10 11 12
13 14 15 16
17 18
16
15
14
7 8
6
5
12 13
11
10
9
4
1
3
2
5
6
7
8
15
16
17
18
14
2
3
4
1
10
11
12
13
9
A1 A2 A3 A4 A5 A6 A7 A8 A9 A10 A11 A12 A13 A14 A15 A16
B1 B2 B3 B4 B5 B6 B7 B8 B9 B10 B11 B12 B13 B14 B15 B16
E1 E2 E3 E4 E5 E6 E7 E8 E9 E10 E11 E12 E13 E14 E15 E16
F1 F2 F3 F4 F5 F6 F7 F8 F9 F10 F11 F12 F13 F14 F15 F16
D08RY00182
AIR CONDITIONING 1B–119
Chart A: Magnet Clutch Does Not work
NO
The harness is disconnected.
NO
Replace the failed relay.
NO
Failure on the power supply system.
NO
NO
NO
Replace the fuse.
YES
Failure on the magnet clutch.
NO
Replace the electronic thermostat.
YES
YES
YES
YES
YES
NO
YES
The harness is disconnected.
Failure on the pressure switch or
refrigerant is insufficient.
Turn the A/C (air conditioner) switch on.
Are the pressure switch side connector
terminals No.1
and No.2
conducted?
C-25
C-25
Are relays normal?
Is fuse (C-20) 10A normal?
Is the electronic thermostat normal?
Is the battery voltage present between
the chassis harness side connector
terminal No.1
and the ground?
E-3
Is the battery voltage present between
the chassis harness side connector
terminal No.1
and the ground.
C-25
Is the battery voltage present between
the chassis side relay terminal No.3
and the ground, and No.1
and the ground?
X-7
X-5
YES
Turn the ignition switch off.
Is conduction provided between the
following chassis harness side connecter
terminals?
No.2 and
No.2 .
No.4 and
No.1 .
E-3
X-7
X-7
X-5
Turn the ignition switch on (the engine is
started).
Magnet clutch does not work
Chart A
Type of trouble
1B–120 AIR CONDITIONING
NO
NO
The harness is disconnected.
YES
YES
Failure on PCM (see Chapter 6E for A/C
control with PCM).
Is the battery voltage present between the
chassis harness side connector terminal
No.14
and the ground?
I-32
Is conduction provided between the
following chassis harness side connector
terminals?
No.B14 and
No.3 .
No.E15 and
No.4 .
X-5
C-3
X-7
C-1
Disconnect the connector
on the
automatic heater/air conditioner control
unit.
I-32
The harness is disconnected between No.1
and No.14
.
I-32
X-5
YES
When you turned on the "Auto" switch,
does the battery voltage appear
between the chassis harness connector
terminal No.14
and the ground?
I-32
Failure on the automatic heater/air conditioner
control unit.
NO
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