engine ISUZU AXIOM 2002 Service Owner's Guide

HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
1A±103
Chart B: Failure on the Intake Control
StepActionValue(s)Ye sNo
1Is the fuse No.F±7 normal?
ÐGo to Step 2
Replace the
fuse
2Is the relay No.X±1 normal?
ÐGo to Step 3
Replace the
relay
3Turn on the ignition switch. (the engine is run.)
Is the intake actuator stopped?
ÐGo to Step 5Go to Step 4
4Replace or repair the auto air conditioner control unit.
Is the action complete?
ÐVerify repairÐ
5Is there continuity between the harness side connector
terminal No.C33±5 and No.I20±11?
ÐGo to Step 7Go to Step 6
6Repair an open circuit between terminal No.C33±5 and
No.I20±11.
Is the action complete?
ÐGo to Step 5Ð
7Is there continuity between the harness side connector
terminal No.C33±6 and No.I20±12?
ÐGo to Step 9Go to Step 8
8Repair an open circuit between terminal No.C33±6 and
No.I20±12.
Is the action complete?
ÐGo to Step 7Ð
9Is there continuity between the harness side connector
terminal No.C33±1 and No.I20±13?
ÐGo to Step 11Go to Step 10
10Repair an open circuit between terminal No.C33±1 and
I20-13.
Is the action complete?
ÐGo to Step 9Ð
11Is there continuity between the harness side connector
terminal No.C33±2 and No.I20±14?
ÐGo to Step 13Go to Step 12
12Repair an open circuit between harness No.C33±2 and
No.I20±14.
Is the action complete?
ÐGo to Step 11Ð
131. Disconnect the intake actuator connector No.C33.
2. Is the battery voltage applied between harness side
connector terminal
No.C33±6 and ground?
No.C33±2 and ground?
No.C33±1 and ground?
ÐGo to Step 14Go to Step 15
14Replace or repair the intake actuator.
Is the action complete?
ÐVerify repairÐ
15Replace or repair the air conditioner control unit.
Is the action complete?
ÐVerify repairÐ

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

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

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±115
Inspection of the Magnetic Clutch System
6VE1 Engine
D08R200037

1A±116
HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
ConditionPossible causeCorrection
Magnetic clutch does not workÐRefer to Chart A
Chart A: Magnetic Clutch Does Not work
StepActionValue(s)Ye sNo
1Is the fuse No.F±7 normal?
ÐGo to Step 2
Replace the
fuse
2Is the relay No.X±2 (compressor relay) No.X±8 (A/C
thermo relay) and No.X±1 (heater relay) normal?
ÐGo to Step 3
Replace the
relay
3Is there continuity between the pressure switch side
connector terminal No.C21±1 and No.C21±2?
ÐGo to Step 5Go to Step 4
4Pressure switch defective or refrigerant pressure
improper.
Pressure switch replaced or refrigerant pressure
adjusted?
ÐGo to Step 3Ð
51. Turn the ignition switch on. (the engine is run.)
2. Turn the air conditioner switch on.
Is the battery voltage applied between the harness side
connector terminal No.E2±1 and the ground?
ÐGo to Step 7Go to Step 6
6Magnetic clutch defective or earth defective.
Magnetic clutch replaced or earth replaced?
ÐGo to Step 5Ð
7Is there continuity between the harness side connector
terminal No.X2±1 and No.E2±1?
ÐGo to Step 9Go to Step 8
8Repair an open circuit between terminal No.X2±1 and
No.E2±1.
Is the action complete?
ÐGo to Step 7Ð
9Is the battery voltage applied between the harness side
connector terminal No.X2±5 and ground, No.X2±2 and
ground?
ÐGo to Step 11Go to Step 10
10Repair an open circuit between terminal No.X2±5 and
fuse No.F±7, No.X2±2 and fuse No.F±7.
Is the action complete?
ÐGo to Step 9Ð
11Is the battery voltage applied between the harness side
connector terminal No.I20±18 and ground?
ÐGo to Step 13Go to Step 12
12Repair an open circuit between terminal No.I20±18 and
No.X2±4.
Is the action complete?
ÐGo to Step 11Ð
13Is the battery voltage applied between the harness side
connector terminal No.C21±2 and ground?
ÐGo to Step 15Go to Step 14
14Repair an open circuit between terminal No.C21±2 and
fuse No.F±7.
Is the action complete?
ÐGo to Step 13Ð
15Is the battery voltage applied between the harness side
connector terminal No.X8±5 and ground, No.X8±2 and
ground?
ÐGo to Step 17Go to Step 16
16Repair an open circuit between terminal No.X8±5 and
No.C21±1, No.X8±2 and fuse No.F±7.
Is the action complete?
ÐGo to Step 15Ð

HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
1A±117
Chart A: Magnetic Clutch Does Not work (Cont'd)
StepNo Ye s Value(s) Action
17Is the battery voltage applied between the harness side
connector terminal No.I19±14 and ground?
ÐGo to Step 19Go to Step 18
18Repair an open circuit between terminal No.X8±3 and
I19±14.
Is the action complete?
ÐGo to Step 17Ð
19Is there continuity between the harness side connector
terminal No.X8±1 and PCM (F45)?
ÐGo to Step 21Go to Step 20
20Repair an open circuit between terminal No.X8±1 and
PCM (F45).
Is the action complete?
ÐGo to Step 19Ð
21Is there continuity between the harness side connector
terminal No.X2±4 and PCM (F4)?
ÐGo to Step 23Go to Step 22
22Repair on open circuit between terminal No.X2±4 and
PCM (F4).
Is the action complete?
ÐGo to Step 21Ð
23Is there continuity between the harness side connector
terminal No.I20±4 and ground?
ÐGo to Step 25Go to Step 24
24Repair an open circuit between terminal No.I20±4 and
PCM (S47).
Is the action complete?
ÐGo to Step 23Ð
251. Connect the connector of PCM.
2. Connect the connector terminal No.I19±14 which is
on the harness side on the auto air conditioner
control unit.
Magnetic clutch works?
Ð
Replace the
auto air
conditioner
control unit
Replace the
PCM
CAUTION: T h e r e a r e conditions which air
conditioner system dose not operate except trouble
as follows.
1. The throttle is griater than 90%.
2. The ignition voltage is below 10.5 volts.
3. The engine speed greater than 4500 RPM for 5
seconds or 5400 RPM.
4. The engine coolant temperature (ECT) is greater
than 125
C (257
F).
5. The intake air temperature (IAT) is less than 5
C
(41
F).
6. The power steering pressure switch signals a
high pressure condition.