Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Service manual — part 30
HEATING, VENTILATION AND AIR CONDITIONING (HVAC) 1A–91
Troubleshooting With Self-Diagnosis Function
Overview of Self-Diagnosis Function
Sensors (input) and actuators (output) are used to check
circuit function and provide essential data on these
circuits. For more detailed information, refer to the
[Inspection and Repair] Sections for the applicable
system or component.
The Table below shows how to turn the self-diagnosis
function on and off.
Self-Diagnosis Operation Procedure
865R200033
1A–92 HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
Step
Action
Value(s)
Yes
No
1
1. 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?
—
Go to
Step 2
—
2
Simultaneously 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?
—
Go to
Step 3
Replace
display unit
3
Press the COMPUTER MODE key.
Does DIAG AIRCON appear on the display?
—
Go to
Step 4
Replace
audio unit
4
NOTE: A ’1’ should appear in the set temperature
segment of the display.
Does ’0’ appear in the outside air segment of the
display?
—
Go to
Step 6
Go to
Step 5
5
Repair or replace damaged parts.
NOTE: Refer to
Step 1 Trouble Code Table.
Is the action complete?
—
Go to
Step 1
—
6
Press 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?
—
Go to
Step 8
Go to
Step 7
7
Repair or replace damaged parts.
NOTE: Refer to
Step 2 Trouble Code Table.
Is the action complete?
—
Go to
Step 1
—
8
Press and release the
fan switch (one time only).
NOTE:
D
Refer to
Step 3 Sensor Output Check for a sample
output value.
D
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?
—
Go to
Step 10
Go to
Step 9
9
Repair or replace damaged parts.
NOTE: Refer to
Trouble Spot Inspection.
Is the action complete?
—
Go to
Step 1
—
10
Press 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?
—
Go to
Step 12
Go to
Step 11
HEATING, VENTILATION AND AIR CONDITIONING (HVAC) 1A–93
Step
No
Yes
Value(s)
Action
11
Repair or replace damaged parts.
NOTE: Refer to
Trouble Spot Inspection.
Is the action complete?
—
Go to
Step 1
—
12
1. Press and release the
fan switch (one time only).
2. Press the DEF switch several times.
NOTE: A ’3’ should appear in the set temperature
segment of the display.
Does the correct sequence pattern (1, 2, 1, 2) appear in
the outside air segment of the display?
—
Go to
Step 15
Go to
Step 13
13
Perform diagnosis for DEF switch, intake actuator, and
AUTO A/C control unit.
Have the diagnosis procedures been completed.
—
Go to
Step 14
—
14
1. Press and release the
fan switch (one time only).
2. Press the DEF switch several times.
Are all parts operating normally?
—
Go to
Step 15
Replace
display unit
15
Turn the starter switch OFF.
Is the action complete?
—
—
—
1A–94 HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
STEP 1: Trouble Code Table
Trouble
Code
Defective Part
Trouble
Code
Defective Part
1
In Car Sensor Open Circuit
– 1
In Car Sensor Short Circuit
2
Ambient Sensor Open Circuit
– 2
Ambient Sensor Short Circuit
3
Sun Sensor Open Circuit
– 3
Sun Sensor Short Circuit
4
Duct Sensor Open Circuit
– 4
Duct Sensor Short Circuit
5
Mix Potentiometer Open Circuit
– 5
Mix Potentiometer Short Circuit
6
Mode Encoder Open Circuit
7
Intake Encoder Open Circuit
0
No Defective Part
STEP 2: Trouble Code Table
Trouble
Code
Defective Part
Trouble
Code
Defective Part
1
In Car Sensor Open Circuit
– 1
In Car Sensor Short Circuit
2
Ambient Sensor Open Circuit
– 2
Ambient Sensor Short Circuit
3
Not Used
– 3
Sun Sensor Short Circuit
4
Duct Sensor Open Circuit
– 4
Duct Sensor Short Circuit
5
Mix Potentiometer Open Circuit
– 5
Mix Potentiometer Short Circuit
6
Mode Encoder Open Circuit
7
Intake Encoder Open Circuit
0
No Defective Part
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