Isuzu Trooper (1998-2002 year). Manual — part 41
AIR CONDITIONING 1B–105
Chart A: Does Not Work At All
NO
Failure on the power supply circuit.
NO
Failure on the actuator.
NO
The harness is disconnected.
NO
Replace the automatic heater/air conditioner
control unit.
YES
YES
YES
YES
Turn on the ignition switch (the engine is
started).
Switch between the fresh air intake and the
interior air circulation.
Failure on the intake link unit (intake door
lock).
Is the battery voltage present between the
chassis harness side connector terminal
No.3
and the ground?
I-49
Is the battery voltage present between
the chassis harness side connector
terminal No.4
and the ground?
I-49
Is the battery voltage present between
the chassis harness side connector
terminal No.11
and the ground?
I-32
During the above switch operations, did
the voltage between the chassis harness
side connector terminal No.11
and
the ground go below 0.5V?
I-32
1B–106 AIR CONDITIONING
Chart B: Failure on the Intake Control
NO
The harness is disconnected.
NO
Failure on the automatic heater/air
conditioner control unit.
NO
Failure on the automatic heater/air
conditioner control unit.
YES
YES
YES
Turn on the ignition switch (the engine is
started).
Disconnect the intake actuator connector
(I-49).
Failure on the intake actuator.
Is the intake actuator stopped?
Is conduction provided between the
following chassis harness side connector
terminals?
No.5 and
No.11 .
No.6 and
No.12 .
No.1 and
No.13 .
No.2 and
No.14 .
I-33
I-49
I-33
I-49
I-33
I-49
I-33
I-49
Is voltage (approximately 5V) present
between the following?
No.12
and the ground.
No.13
and the ground.
No.14
and the ground.
I-33
I-33
I-33
AIR CONDITIONING 1B–107
Inspection of the Mix Actuator System
H-67
I-32
I-33
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
I-45
I-32
M
6
6
0.3 V/W
I-33
11
3
0.5 B/L
5
7
0.3 V
15
2
0.3 V/G
5
23
20
6
16
24
8
0.3 V/R
I-45
3 KW
Heat
(Potentio Meter)
Cool
Cool
Heat
Mix Actuator
Auto A/C Control Unit
(
HEAT TO COOL
)
+
Cool side
+
Heat side
(
COOL TO HEAT
)
(
GND
)
(Mix Potentio Meter)
(+
5 V
)
4
5
8
7
6
0.3 V/W
0.3 B/L
0.3 V
0.3 V/G
H-67
H-67
H-67
H-67
H-67
0.3 V/R
1
2
5
6
3
4
8
9
7
1 2
3
8
4 5 6 7
1
2
3
8
4
5
6
7
Type of the
trouble
Control failure.
Chart B
Does not work at all.
Chart A
D08RY00179
1B–108 AIR CONDITIONING
Chart A: Does Not work At All
NO
The harness is disconnected.
NO
Replace the automatic heater/air
conditioner control unit.
NO
Replace the automatic heater/air
conditioner control unit.
YES
YES
YES
Turn on the ignition switch (the engine is
started).
Disconnect the mix actuator connector
.
Short-circuit he chassis harness side
connector terminal No.3
and No.7
.
I-45
I-45
I-45
Using the temperature control lever,
select FC for the temperature.
Using the temperature control lever,
select FC for the temperature.
Failure on the actuator.
Is the battery voltage present on a regular
interval basis between the chassis
harness side connector terminals No.6
(+) and No.5
(-)?
I-32
I-32
Is conduction provided between the
following chassis harness side connector
terminals?
No.6 and
No.6 .
No.5 and
No.8 .
I-45
I-32
I-45
I-32
Is the battery voltage present on a regular
interval basis between the chassis
harness side connector terminals No.6
(-) and No.5
(+)?
I-32
I-32
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