Symptom Related Diagnostic Procedures
FS(2.0L) KL(2.5L):
Symptom: Magnetic clutch and condenser fan do not operate (FS engine vehicle)
Related components Fuses, A/C amplifier, ACS, A/C relay, PCME, Refrigerant pressure switch, wiring harness
System Operation
1. Signals from the blower switch and ACS 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 thermistor's resistance changes.
4. The A/C amplifier signals the PCME to turn on or off the magnetic clutch based on the evaporator's temperature. This protects the evaporator from freezing.
5. The PCME controls the magnetic clutch by turning ON and OFF the A/C relay.
6. To help liquefy refrigerant, the condenser fan rotates to increase airflow through the condenser when the A/C compressor is on.
7. If the refrigerant pressure switch is broken or there is abnormal pressure in the refrigerant system, the pressure will remain open and not allow current to flow to the magnetic clutch and condenser fan.
Step 1
1. Check the following fuses.
2. If a fuse is burnt, check for a short-circuit in the wiring harness before replacing the fuse.
3. If the fuses are OK, go to Step 2.
Step 2
1. Remove the A/C relay.
2. Turn the ignition switch to ON.
3. Measure the voltage at the following terminals of the A/C relay connector.
Step 3
1. Apply battery positive voltage and check for continuity between the terminals of the A/C relay.
2. If correct, reinstall the A/C relay and go to Step 4.
3. If not as specified, replace the A/C relay.
Step 4
Front console
Image Reference No. 11.
Pull the front console forward to disengage the clips.
1. Remove the front console.
2. Disconnect the appropriate PCME connector.
3. Connect a jumper wire between terminal wire (G/W) of the A/C relay connector and ground.
4. Start the engine, and verify that the magnetic clutch and condenser fan operate.
Step 5
1. Press the ACS to ON and set the blower switch to the first position.
2. Verify that the ACS indicator light illuminates. Testing and Inspection
Step 6
Measure the voltage at the following terminals of the PCME connector. Testing and Inspection
FS engine MTX vehicle
FS Engine ATX Vehicle
KL Engine vehicle
Testing and Inspection
Step 7
Measure the voltage at the following terminals of the A/C amplifier. Service and Repair Testing and Inspection
Symptom: Magnetic clutch does not operate (Condenser fan operate normally) (KL engine vehicle)
Related components Magnetic clutch, wiring harness, refrigerant system
System Operation
1. Signals from the blower switch and ACS 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 PCME to turn ON or OFF the magnetic clutch based on the evaporator's temperature. This protects the evaporator from freezing.
5. The PCME controls the magnetic clutch by turning on and off the A/C relay.
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 OFF 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 blower switch and ACS to ON, and check the magnetic clutch operation.
Step 2
. Connect a manifold gauge set to the charging valves. Testing and Inspection
2. Measure the high-pressure-side pressure.
Step 3
1. Verify that the ignition switch, blower switch and ACS are ON.
2. Measure the voltage at following terminal wire of the refrigerant pressure switch connector.
Step 4
Measure the voltage at following terminal wire of the magnetic clutch connector.
Step 5
Measure the voltage at following terminal wires of the A/C relay connector.
Symptom: Magnetic clutch does not operate (Condenser fan operate normally) (FS engine vehicle)
Related components Magnetic clutch, wiring harness
Remedy
1. Turn the ignition switch to ON.
2. Measure the voltage at following terminal wire of the magnetic clutch connector.