AT
AT
AT
AT Air
Air
Air
Air Conditioner
Conditioner
Conditioner
Conditioner
- 189 -
Diagnosis
Diagnosis
Diagnosis
Diagnosis and
and
and
and Testing
Testing
Testing
Testing
A/C
A/C
A/C
A/C system
system
system
system performance
performance
performance
performance diagnosis
diagnosis
diagnosis
diagnosis
12. Fault diagnosis of internal/external circulation.
Step Operation
Yes
No
1
① Turn the ignition switch to ON position with the engine off.
②
Set the blower motor switch to maximum speed position.
③ Set the mode switch to “ TO-FACE/FEET ” position.
④
Set the internal circulation switch to “ VENTILATION ” position.
⑤ Set the internal circulation switch to “ INTERNAL CIRCULATION ”
position.
D o you hear any change in air flow sound when setting the internal
circulation switch to “ INTERNAL CIRCULATION ” position?
Go to Step 2. Go to Step 2.
2
①
Set the internal circulation switch to “ VENTILATION ” position.
② Observe the drive shaft of internal circulation actuator.
③
Set the internal circulation switch to “ INTERNAL CIRCULATION ”
position.
Does the drive shaft of internal circulation actuator rotate?
Go to Step 3. Go to Step 3.
3
① Observe the drive shaft of internal circulation actuator.
② Use the fault diagnosis instrument and command the internal
circulation actuator transfer to “ INTERNAL CIRCULATION ” and
“ VENTILATION ” positions.
Does the drive shaft of internal circulation actuator rotate?
Go to Step 11. Go to Step 4.
4
①
Turn the ignition switch to OFF position.
② Disconnect the internal circulation actuator.
③
Turn the ignition switch to ON position with the engine off.
④ Use a test lamp connected to sound ground to detect the ignition
voltage circuit 3 of internal circulation actuator .
I s the test lamp on?
Go to Step 5. Go to Step 12.
5
①
Set a test lamp between damper control Circuit A and ignition voltage
circuit 3 of internal circulation actuator .
②
Use the fault diagnosis instrument and command the internal
circulation actuator transfer to “ INTERNAL CIRCULATION ” and
“ VENTILATION ” positions.
Is the test lamp on when this command is executed?
Go to Step 6. Go to Step 7.
6
①
Set a test lamp between damper control circuit B and ignition voltage
circuit 3 of internal circulation actuator .
② Use the fault diagnosis instrument and command the internal
circulation actuator transfer to “ INTERNAL CIRCULATION ” and
“ VENTILATION ” positions.
Is the test lamp on when this command is executed?
Go to Step 9. Go to Step 8.
7
C heck the internal circulation actuator control Circuit A for open circuit,
excessive resistance, short circuit to ground or voltage.
Is the fault detected and eliminated?
Go to Step 15. Go to Step 11.
8
C heck the internal circulation actuator control Circuit B for open circuit,
excessive resistance, and short circuit to ground or voltage.
Is the fault detected and eliminated?
Go to Step 15. Go to Step 11.
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