Operational Check

Operational Check
The purpose of the operational check is to confirm that the system operates properly.

CONDITIONS:
- Engine running and at normal operating temperature.

PROCEDURE:

1. Check Blower




1. Turn fan dial clockwise, blower should operate on low speed.
2. Continue turning fan dial clockwise, and continue checking blower speeds until all speeds are checked.
3. Leave blower on MAX speed.
If NG, go to ATC-55, "Blower Motor Circuit". Blower Motor Circuit
If OK, continue with next check.

2. Check Discharge Air




1. Turn mode switch clockwise five positions.




2. Confirm that discharge air comes out according to the air distribution table.
Refer to "Discharge Air Flow".

NOTE: Confirm that the compressor clutch is engaged (audio or visual inspection) and intake door position is at FRESH when the DEF is selected.

Intake door position is checked in the next step. If NG, go to ATC-46, "Mode Door Motor Circuit". Mode Door Motor Circuit If OK, continue with next check.

3. Check Recirculation
1. Press REC switch.
Recirculation indicator should illuminate.
2. Press REC switch a second time.
3. Listen for intake door position change (you should hear blower sound change slightly).
If NG, go to ATC-52, "Intake Door Motor Circuit". Intake Door Motor Circuit
If OK, continue with next check.

4. Check Temperature Decrease




1. Turn the temperature dial counterclockwise to "60".
2. Check for cold air at discharge air outlets.
If NG, go to ATC-67, "Insufficient Cooling". Insufficient Cooling
If OK, continue with next check.

5. Check Temperature Increase




1. Turn the temperature dial clockwise to "90".
2. Check for hot air at discharge air outlets.
If NG, go to ATC-74, "Insufficient Heating". Insufficient Heating
If OK, continue with next check.

6. Check AUTO Mode




1. Turn mode dial to AUTO position.
2. Confirm that the compressor clutch engages (audio or visual inspection).
(Discharge air and blower speed will depend on ambient, in-vehicle and set temperatures.) If NG, go to ATC-41, "DIAGNOSTIC PROCEDURE", Automatic Air Conditioner then if necessary, ATC-62, "Magnet Clutch Circuit". Magnet Clutch Circuit

If all operational checks are OK (symptom can not be duplicated), go to GI-25, "How to Perform Efficient Diagnosis for an Electrical Incident" and perform tests as outlined to simulate driving condition environment. If symptom appears, refer to "SYMPTOM TABLE" and perform applicable trouble diagnosis procedures.