With Automatic Climate Control

TROUBLE DIAGNOSIS PROCEDURE FOR MAGNET CLUTCH

INSPECTION FLOW:

SYMPTOM:
- Magnet clutch does not engage.

SYSTEM DESCRIPTION
Auto amplifier controls compressor operation by ambient temperature and signal from ECM.




Low Temperature Protection Control
Auto amplifier will turn the compressor "ON" or "OFF" as determined by a signal detected by ambient sensor.

When ambient temperatures are greater than -2° C (28° F), the compressor turns "ON". The compressor turns "OFF" when ambient temperatures are less than -5° C (23° F).

Step 1:

Step 2:

Step 3:

Step 4:

Step 5:

Step 6:

Step 7:

Step 8:

Step 9:

DIAGNOSTIC PROCEDURE
SYMPTOM: Magnet clutch does not engage when AUTO switch is ON.

COMPONENT INSPECTION







A/C Relay
Check continuity between terminal Nos. 3 and 5.
If NG, replace relay.







Refrigerant Pressure Sensor
Make sure that higher A/C refrigerant pressure results in higher refrigerant-pressure sensor output voltage.