ISUZU AXIOM 2002 Service Repair Manual

HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
1A±105
Chart A: Does Not work At All
StepActionValue(s)Ye sNo
11. Turn on the ignition switch (the engine is run).
2. Disconnect the mix actuator connector (C±43).
3. Short-circuit the chassis harness side connector
terminal No.C43±3 and No.C43±7.
4. Using the temperature control switch, select 18
C
(65
F) for the temperature.
Is the battery voltage applied on a regular interval basis
between the harness side connector terminal
No.C43±6 (-) and No.C43±8 (+)?
ÐGo to Step 3Go to Step 2
2Replace the auto air conditioner control unit.
ÐVarify repairÐ
3Using the temperature control switch, select 32
C
(90
F) for the temperature.
Is the battery voltage applied on a regular interval basis
between the harness side connector terminal
No.C43±6 (+) and No.C43±8 (-)?
ÐGo to Step 5Go to Step 4
4Replace the auto air conditioner control unit.
ÐVerify repairÐ
5Is there continuity between the harness side connector
terminal No.I19±6 and No.C43±6?
ÐGo to Step 7Go to Step 6
6Repair an open circuit between terminal No.I19±6 and
No.C43±6.
Is the action complete?
ÐGo to Step 5Ð
7
Is there continuity between the harness side connector
terminal No.I19±5 and No.C43±8?
ÐGo to Step 9Go to Step 8
8Repair an open circuit between terminal No.I19±5 and
No.C43±8.
Is the action complete?
ÐVerify repairÐ
9Replace the mix actuator.
Is the action complete?
ÐVerify repairÐ

1A±106
HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
Chart B: Mix Actuator Control Failure
StepActionValue(s)Ye sNo
1Turn the ignition switch (the engine is run).
Dose the mix actuator fully stroke when 32
C (90
F)
and 18
C (65
F) of the temperature control switch?
ÐGo to Step 3Go to Step 2
2Repair or replace the air mix door or the link unit.
Is the action complete?
ÐVarify repairÐ
3Is there continuity between the harness side connector
terminal No.C43±3 and No.I20±11?
ÐGo to Step 5Go to Step 4
4Repair an open circuit between terminal No.C43±3 and
No.I20±11.
Is the action complete?
ÐGo to Step 3Ð
5Is there continuity between harness side connector
terminal No.C43±7 and No.I20±5?
ÐGo to Step 7Go to Step 6
6Repair an open circuit between terminal No.C43±7 and
No.I20±5.
Is the action complete?
ÐGo to Step 5Ð
7Is there continuity between the harness side connector
terminal No.C43±2 and No.I20±15?
ÐGo to Step 9Go to Step 8
8Repair an open circuit between terminal No.C43±2 and
No.I20±15.
Is the action complete?
ÐGo to Step 7Ð
9Is sum of the voltage between the following chassis
harness side connector terminals approximately 5V?
No.I20±15 and No.I20±5, No.I20±5 and No.I20±11
ÐGo to Step 11Go to Step 10
10Replace the actuator.
Is the action complete?
ÐVerify repairÐ
11Replace the auto air conditioner control unit.
Is the action complete?
ÐVerify repairÐ

HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
1A±107
Inspection of the Mode Actuator System
D08R200035
ConditionPossible causeCorrection
Does not work at allÐRefer to Chart A
Control failureÐRefer to Chart B

1A±108
HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
Chart A: Does Not Work At All
StepActionValue(s)Ye sNo
11. Turn on the ignition switch (the engine is run).
2. Disconnect the mode actuator connector (C±42)
3. Select VENT pressing the mode actuator.
Is the battery voltage provided on a regular interval
between the harness side connector terminal
No.C42±1 (+) and No.C42±5 (-)?
ÐGo to Step 3Go to Step 2
2Replace the auto air conditioner control unit.
Is the action complete?
ÐVarify repairÐ
3Turn on the DEF mode switch.
Is the battery voltage provided on a regular interval
between the chassis side connector terminal
No.C42±5 (+) and No.C42±1 (-)?
ÐGo to Step 5Go to Step 4
4Replace the auto air conditioner control unit.
ÐVarify repairÐ
5Is there continuity between the harness side connector
terminal No.C42±1 and No.I19±4?
ÐGo to Step 7Go to Step 6
6Repair an open circuit between terminal No.C42±1 and
No.I19±4.
Is the action complete?
ÐGo to Step 5Ð
7Is there continuity between the harness side connector
terminal No.C42±5 and No.I19±3?
ÐGo to Step 9Go to Step 8
8Repair an open circuit between terminal No.C42±5 and
No.I19±3.
Is the action complete?
ÐVerify repairÐ
9Replace the mode actuator.
ÐVerify repairÐ

HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
1A±109
Chart B: Mode Actuator Control Failure
StepActionValue(s)Ye sNo
1Turn on the ignition switch (the engine is run).
Dose the mode actuator fully stroke when the defrost
mode and the vent mode are selected?
ÐGo to Step 3Go to Step 2
2Repair or replace the mode door or the link unit.
Is the action complete?
ÐGo to Step 1Ð
3Is there continuity between the harness side connector
terminal No.C42±9 and No.I20±11?
ÐGo to Step 5Go to Step 4
4Repair an open circuit between terminal No.C42±9 and
No.I20±11.
Is the action complete?
ÐGo to Step 3Ð
5Is there continuity between the harness side connector
terminal No.C42±3 and No.I20±10?
ÐGo to Step 7Go to Step 6
6Repair an open circuit between terminal No.C42±3 and
No.I20±10.
Is the action complete?
ÐGo to Step 5Ð
7Is there continuity between harness side connector
terminal No.C42±4 and No.I20±8?
ÐGo to Step 9Go to Step 8
8Repair an open circuit between terminal No.C42±4 and
No.I20±8.
Is the action complete?
ÐGo to Step 7Ð
9Is sum of the voltage between the following harness
side connector terminal approximately 5V? Voltage
between No.I20±8 and No.I20±10 plus voltage
between No.I20±8 and No.I20±11
5VGo to Step 11Go to Step 10
10Replace the actuator.
Is the action complete?
ÐVerify repairÐ
11Dose the mode actuator work normally through manual
operation?
ÐGo to Step 13Go to Step 12
12Replace the sensor.
Is the action complete?
ÐVerify repairÐ
13Replace the auto air conditioner control unit.
Is the action complete?
ÐVerify repairÐ

1A±110
HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
Inspection of the Fan Motor System
D08R200058

HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
1A±111
ConditionPossible causeCorrection
The fan dose not rotate at allÐRefer to Chart A
The fan dose not rotate in the
MAX±HI modeÐRefer to Chart B
The fan dose not rotate in any mode
other than MAX±HIÐRefer to Chart C
The fan dose not stopÐRefer to Chart D
Chart A: Fan Does Not Rotate At All
StepActionValue(s)Ye sNo
1Are the fuse No.F±5, F±6 and No.F±7 normal?
ÐGo to Step 2
Replace the
fuse
2Are the relay No.X±1 and No.C±35 normal?
ÐGo to Step 3
Replace the
relay
3Turn on the ignition switch (the engine is run).
Is the battery voltage applied between the harness side
connector terminal No.C36±1 and ground?
ÐGo to Step 5Go to Step 4
4Repair an open circuit between terminal No.C36±1 and
No.F±5 and F±6 fuse.
Is the action complete?
ÐGo to Step 3Ð
5Is there continuity between the harness side connector
terminal No.C36±2 and ground (No.C±10)?
ÐGo to Step 7Go to Step 6
6Repair an open circuit between terminal No.C36±2 and
ground.
Is the action complete?
ÐÐÐ
7Is the battery voltage applied between the harness side
connector terminal No.C36±2 and No.C36±1?
ÐGo to Step 8Go to Step 9
8Replace the blower motor.
Is the action complete?
ÐVerify repairÐ
9Refer to chart B and C.
Is the action complete?
ÐVerify repairÐ

1A±112
HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
Chart B: Fan Does Not Rotate in MAX HI Mode
StepActionValue(s)Ye sNo
1Is the MAX-HI relay (C±35) normal?
ÐGo to Step 2
Replace the
relay
21. Turn on the ignition switch (the engine is run).
2. Set the fan switch to the MAX-HI.
Is there continuity between the harness side connector
terminal No.C36±2 and No.C35±5?
ÐGo to Step 4Go to Step 3
3Repair an open circuit between terminal No.C36±2 and
No.C35±5.
Is the action complete?
ÐGo to Step 3Ð
4Is there continuity between the harness side connector
terminal No.C35±1 and ground (No.C±10)?
ÐGo to Step 6Go to Step 5
5Repair an open circuit between terminal No.C35±1 and
ground (No.C±10).
Is the action complete?
ÐGo to Step 4Ð
6Is the battery voltage applied between the harness side
connector terminal No.C35±2 and ground?
ÐGo to Step 8Go to Step 7
7Repair an open circuit between terminal No.C35±2 and
No.F±7 fuse.
Is the action complete?
ÐGo to Step 6Ð
8Is the battery voltage applied between the harness side
connector terminal No.I19±2 and ground?
ÐGo to Step 10Go to Step 9
9Repair an open circuit between terminal No.C35±4 and
No.I19±2.
Is the action complete?
ÐVerify repairÐ
10Replace the auto air conditioner control unit.
Is the action complete?
ÐVerify repairÐ

HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
1A±113
Chart C: Fan Does Not Rotate In Any Mode Other Than MAX HI
StepActionValue(s)Ye sNo
1Is the power transistor performance normal? (Refer to
the
later section on ªindividual inspectionº)
ÐGo to Step 2
Replace the
power
transistor
2Is there continuity between the harness side connector
terminal No.C36±2 and No.C34±1, No.C36±2 and
No.I20±17?
ÐGo to Step 4Go to Step 3
3Repair an open circuit between terminal.
No.C36±2 and C34±1
No.C36±2 and I20±17
ÐGo to Step 2Ð
4Is there continuity between the harness side connector
terminal No.C34±3 and ground (No.C±10)?
ÐGo to Step 6Go to Step 5
5Repair an open circuit between terminal No.C34±3 and
ground.
Is the action complete?
ÐGo to Step 4Ð
6Is there continuity between the harness side connector
terminal No.C34±2 and No.I20±19?
ÐGo to Step 8Go to Step 7
7Repair an open circuit between terminal No.C34±2 and
No.I20±19.
Is the action complete?
ÐGo to Step 6Ð
8Replace the auto air conditioner control unit.
Is the action complete?
ÐVerify repairÐ

1A±114
HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
Chart D: Fan Does Not Stop
StepActionValue(s)Ye sNo
11. Disconnect the max high relay, the power transistor
connector C±34 and the auto A/C control unit
connector I±20.
2. Turn on the ignition switch.
Does the blower motor stop?
ÐGo to Step 3Go to Step 2
2Repair a short circuit between connector No.C36±2
and No.C35±5, No.C36±2 and No.C34±1, or
No.C36±2 and I20±17.
Is the action complete?
ÐVerify repairÐ
3Is the max high relay normal? (Refer to the later section
on ªindividual inspectionº.
)ÐGo to Step 4
Replace the
relay
4Reinstall the max high relay.
Does the blower motor start operating?
ÐGo to Step 6Go to Step 5
5Repair a short circuit between connector No.C35±4
and No.I19±2.
Is the action complete?
ÐGo to Step 4Ð
6Is the power transistor normal? (Refer to the later
section on ªindividual inspectionº.
)
ÐGo to Step 7
Replace the
power
transistor
7Reinstall the power transistor.
Does the blower motor start operating?
Ð
Replace the
auto A/C
control unit
Ð