2002 ISUZU AXIOM sensor

1A±92
HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
StepActionValue(s)Ye sNo
11. Allow the engine to idle until it completely warms up.
2. Turn the starter switch to the OFF position.
3. Place a 60±watt lamp approximately 15 cm from the
sun sensor.
NOTE: This procedure is best performed at night or in
a dark, unlit area.
Is the action complete?
ÐGo to Step 2Ð
2Simultaneously press and hold the RESET key and the
CLOCK key (display unit).
Move the starter switch to start the engine.
Does DIAG appear on the display?
ÐGo to Step 3
Replace
display unit
3Press the COMPUTER MODE key.
Does DIAG AIRCON appear on the display?
ÐGo to Step 4
Replace
audio unit
4NOTE: A '1' should appear in the set temperature
segment of the display.
Does '0' appear in the outside air segment of the
display?
ÐGo to Step 6Go to Step 5
5Repair or replace damaged parts.
NOTE: Refer to
Step 1 Trouble Code Table.
Is the action complete?ÐGo to Step 1Ð
6Press and release the  fan switch (one time only).
NOTE: A '2' should appear in the set temperature
segment of the display.
Does '0' appear in the outside air segment of the
display?
ÐGo to Step 8Go to Step 7
7Repair or replace damaged parts.
NOTE: Refer to
Step 2 Trouble Code Table.
Is the action complete?ÐGo to Step 1Ð
8Press and release the  fan switch (one time only).
NOTE:

Refer to
Step 3 Sensor Output Check for a sample
output value.

A '3' should appear in the set temperature
segment of the display.
Does the correct sensor output value appear in the
outside air segment of the display?
ÐGo to Step 10Go to Step 9
9Repair or replace damaged parts.
NOTE: Refer to
Trouble Spot Inspection.
Is the action complete?ÐGo to Step 1Ð
10Press and release the  fan switch one time only.
NOTE: Refer to
Step 4 (Operation Check) for display
readings and inspection steps.
Are all parts operating normally?
ÐGo to Step 12Go to Step 11

1A±94
HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
STEP 1: Trouble Code Table
Trouble
CodeDefective PartTrouble
CodeDefective Part
1In Car Sensor Open Circuit± 1In Car Sensor Short Circuit
2Ambient Sensor Open Circuit± 2Ambient Sensor Short Circuit
3Sun Sensor Open Circuit± 3Sun Sensor Short Circuit
4Duct Sensor Open Circuit± 4Duct Sensor Short Circuit
5Mix Potentiometer Open Circuit± 5Mix Potentiometer Short Circuit
6Mode Encoder Open Circuit
7Intake Encoder Open Circuit
0No Defective Part
STEP 2: Trouble Code Table
Trouble
CodeDefective PartTrouble
CodeDefective Part
1In Car Sensor Open Circuit± 1In Car Sensor Short Circuit
2Ambient Sensor Open Circuit± 2Ambient Sensor Short Circuit
3Not Used± 3Sun Sensor Short Circuit
4Duct Sensor Open Circuit± 4Duct Sensor Short Circuit
5Mix Potentiometer Open Circuit± 5Mix Potentiometer Short Circuit
6Mode Encoder Open Circuit
7Intake Encoder Open Circuit
0No Defective Part

HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
1A±95
STEP 3: Sensor Output Check
865R200035

HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
1A±97
Inspection By Failed Location
Inspection of the Sensors
When the self-diagnosis function has determined that
trouble is present on the sensors, check them according
to the following flow chart.
F01RY00005

1A±98
HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
Chart 1: In Car Sensor
D08R200029
StepActionValue(s)Ye sNo
1Disconnect the in car sensor connector. (No.I-17)
Is performance of the sensor normal? (Refer to the
later section on ªIndividual Inspectionº)ÐGo to Step 2
Replace the
in car sensor
2Is there continuity between the harness side connector
No.I20±1 and No.I17±3?
ÐGo to Step 4Go to Step 3
3Repair an open circuit between terminal No.I20±1 and
No.I17±3.
Is the action complete?
ÐGo to Step 2Ð
4Is there continuity between the harness side connector
No.I20±11 and No.I17±4?
ÐGo to Step 6Go to Step 5
5Repair an open circuit between terminal No.I20±11 and
No.I17±4.
Is the action complete?
ÐGo to Step 4Ð
6Replace the auto air conditioner control unit.
Is the action complete?
ÐVerify repairÐ

HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
1A±99
Chart 2: Ambient Sensor
D08R200030
StepActionValue(s)Ye sNo
1Disconnect ambient sensor connector. (No.C±19)
Is performance of the ambient sensor normal? (Refer
to the
later section on ªIndividual inspectionº)ÐGo to Step 2
Replace the
ambient
sensor
2Connect the ambient sensor connector.
Is resistance between the harness side connector
No.I20±2 and No.I20±11 normal?Refer to the
later section
on ªIndividual
inspectionº
Go to Step 4Go to Step 3
3Repair an open circuit between terminal No.I20±2 and
No.C19±1 or No.I20±11 and No.C19±2.
Is the action complete?
ÐVerify repairÐ
4Replace the auto air conditioner control unit.
Is the action complete?
ÐVerify repairÐ

1A±100
HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
Chart 3: Sun Sensor
D08R200059
StepActionValue(s)Ye sNo
1Disconnect the sun sensor connector. (No.I±15)
Is performance of the sun sensor normal? (Refer to the
later section on individual inspection)ÐGo to Step 2
Replace the
sun sensor.
2Is there continuity between the harness side connector
terminal No.I20±3 and No.I15±2?
ÐGo to Step 4Go to Step 4
3Repair an open circuit between terminal No.I20±3 and
No.I15±2.
Is the action complete?
ÐGo to Step 2Ð
4Is there continuity between the harness side connector
terminal No.I20±11 and No.I15±1?
ÐGo to Step 6Go to Step 5
5Repair an open circuit between terminal No.I20±11 and
I15±1.
Is the action complete?
ÐGo to Step 4Ð
6Replace the auto air conditioner control unit.
Is the action complete?
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