Flowchart No. 4: Magnetic Clutch Inop (Condenser Fan Operates)

System Operation
1. Signals from the fan switch and A/C switch are sent to the A/C amplifier.
2. The evaporator temperature sensor resistance changes as the evaporator's temperature changes.
3. The A/C amplifier monitors the evaporator temperature sensor's resistance changes.
4. The A/C amplifier signals the PCM to turn the magnetic clutch on or off based on the evaporator's temperature. This protects the evaporator from freezing.
5. The PCM controls the magnetic clutch by turning the A/C relay on and off.
6. To help liquefy refrigerant, the condenser fan rotates to increase airflow through the condenser when the A/C compressor is on.


Step 1
1. Turn the ignition switch to LOCK and disconnect the refrigerant pressure switch connector.
2. Connect a jumper wire between terminals A and B of the refrigerant pressure switch connector.
3. Start the engine.








4. Turn the fan switch and A/C switch on, and check the magnetic clutch operation.


Step 2
1. Connect a manifold gauge set to the charging valves.








2. Measure the high-pressure-side pressure.


Step 3
1. Verify that the ignition switch, fan switch, and A/C switch are on.








2. Measure the voltage at the (G/B) terminal wire of the refrigerant pressure switch connector.


Step 4








- Measure the voltage at the (Y) terminal wire of the magnetic clutch connector.


Step 5








- Measure the voltage at following terminal wires of the A/C relay connector.