Operational Check

Operational Check
The purpose of the operational check is to confirm that the system operates as it should. The systems which are checked are the blower, mode (discharge air), intake air, temperature decrease, temperature increase.

CONDITIONS:
Engine running at normal operating temperature.

PROCEDURE:




1. Check Blower
1. Turn fan control dial to 1-speed.
Blower should operate on 1-speed.
2. Then turn fan control dial to 2-speed.
3. Continue checking blower speed until all four speeds are checked.
4. Leave blower on 4-speed.
If NG, go to trouble diagnosis procedure for blower motor .
If OK, continue with next check.




2. Check Discharge Air
1. Press each mode switch.




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

NOTE: Confirm that the compressor clutch is engaged (visual inspection) and intake door position is at FRESH when the DEF is pressed.
Confirm that the intake door position is at FRESH when the D/F is pressed.
Intake door position is checked in the next step.
If NG, go to trouble diagnosis procedure for mode door motor.
If OK, continue with next check.




3. Check Recirculation
1. Press recirculation switch.
Recirculation indicator should light.
2. Listen for intake door position change (you should hear blower sound change slightly).

NOTE:
Confirm that the RECIRCULATION (REC) switch is canceled in the DEF and D/F mode.
If NG, go to trouble diagnosis procedure for intake door motor.
If OK, continue with next check.




4. Check Temperature Decrease
1. Slide temperature control lever to full cold.
2. Check for cold air at discharge air outlets.
If NG, go to trouble diagnosis procedure for insufficient cooling motor.
If OK, continue with next check.




5. Check Temperature Increase
1. Slide temperature control lever to full hot.
2. Check for hot air at discharge air outlets.
If NG, go to trouble diagnosis procedure for insufficient heating motor.
If OK, continue with next check.




6. Check Air Conditioner Switch
Turn fan control switch to the desired (1 to 4-speed) position and push the air conditioner switch to turn ON the air conditioner.
The indicator light should come on when air conditioner is ON.
If NG, go to trouble diagnosis procedure for A/C system

If OK, continue with next check.
If all operational check are OK (symptom can not be duplicated), go to "Incident Simulation Tests" and perform tests as outlined to simulate driving conditions environment. If symptom appears, refer to "Symptom Table" and perform applicable trouble diagnosis procedures.