Troubleshooting With Self-Diagnosis Function - Isuzu 2000 Trooper Workshop Manual

Troubleshooting With Self-Diagnosis Function

Overview of Self-Diagnosis Function
The self-diagnosis is implemented in 3 steps for each
target. For detail of check procedure contained in each
step, refer to the relevant section of "Check Procedure by
Failed Location" listed in the Self–Diagnosis Operation
Procedure.
Self-Diagnosis Operation Procedure
Step
1 1. Set the IG to the OFF position.
2. Apply 60W bulb light to the sun sensor.
3. Set the temperature setting lever on the automatic
heater/air conditioner panel to the center position
(77°F).
4. Set the fan switch on the same panel to the Auto
position.
Is the action complete?
2 While pushing both the Auto switch and the DEF switch
on the automatic heater/air conditioner panel, start the
engine.
Is the current trouble diagnosing function turned on
approximately in 10 seconds?
3 Does the A/C LED flash every 0.5 second interval?
4 Push the A/C switch once.
Does the A/C LED flash every 0.5 second interval?
5 Refer to *3 chart "Check of Output Equipment".
Does each output equipment function normally
according to operation of the temperature setting
level?
6 Push the DEF switch for 5 seconds consecutively or
turn on and off the IG.
Is the action complete?
HEATING, VENTILATION AND AIR CONDITIONING (HVAC) 1A–107
Action
For turning on the self-diagnosis function and switching of
the check step, refer to the flow chart given below. You
can reset the self–diagnosis function by turning the
ignition switch off or turning the DEF switch on for 5
seconds.
Value(s)
— Go to Step 2
— Go to Step 3
— Go to Step 4
— Go to Step 5
— Go to Step 6
— Go to Step 1
Yes No
—
—
Refer to *1.
Refer to *2.
Repair or
replace the
output
equipment or
repair the
harness
—