With Automatic Air Conditioner

TROUBLE DIAGNOSIS PROCEDURE FOR MAGNET CLUTCH

SYMPTOM:
- Magnet clutch does not engage.




INSPECTION FLOW




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 1 °C (34 °F), the compressor turns "ON". The compressor turns "OFF" when ambient temperatures are less than -2 °C (28 °F).

Step 1:

Step 2:

Step 3:

Step 4:

Step 5:

Step 6:

Step 7:

Step 8:

Step 9:

Step 10:

Step 11:

Step 12:

DIAGNOSTIC PROCEDURE

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

ELECTRICAL 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.