NO.24 A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY [YF (2.0L Zetec)]


24	A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY.
DESCRIPTION	The A/C compressor magnetic clutch does not disengage.
POSSIBLE CAUSE	• Stuck engagement A/C compressor magnetic clutch • A/C relay is stuck closed. • Short to GND in wiring harness between A/C switch and PCM • Short to GND in wiring harness between A/C relay and PCM • Short circuit to battery power in A/C relay to magnetic clutch


STEP	INSPECTION	RESULTS	ACTION
1	Connect the WDS or equivalent to the DLC-2. Retrieve any continuous memory, KOEO and KOER DTCs using the WDS or equivalent. Are any DTCs displayed?	Yes	DTC is displayed: Go to the appropriate DTC inspection. (See DTC TABLE [YF (2.0L Zetec)].)
1		No	No DTC is displayed: Go to the next step.
2	Start the engine and idle it. Turn the A/C switch on. Remove the A/C relay. Does the A/C magnetic clutch disengage?	Yes	Inspect for following: • The A/C relay is stuck closed. • Short to GND in wiring harness between A/C relay and PCM terminal 69. If both items normal, go to the next step.
2		No	Inspect if the circuit between the A/C relay and magnetic clutch is shorted to the battery power circuit. • If the circuit is normal, inspect for magnetic clutch stuck engagement or improper.
3	Connect the WDS or equivalent to the DLC-2. Access the ACCS PID. Start the engine and turn the A/C switch on. Read the ACCS PID while disconnecting refrigerant pressure switch connector. Note • The ACCS PID should read "Off" when disconnecting connector. If the ACCS PID remains "On", a short to GND may be present. Does the ACCS PID remain "On"?	Yes	Inspect for short to GND in wiring harness between refrigerant pressure switch and PCM terminal 41.
3		No	Go to the next step.
4	Reconnect refrigerant pressure switch connector. Read ACCS PID while turning off A/C switch. Note • ACCS PID should read Off when turning A/C switch off. If ACCS PID remains On, short to GND may be present. Does ACCS PID remain On?	Yes	Inspect the following: • Short to GND in wiring harness between the A/C switch and A/C amplifier • Short to GND in wiring harness between the A/C amplifier and refrigerant pressure switch
4		No	Inspect for stuck closed A/C switch.
5	Verify test results. • If normal, return to the diagnostic index to service any additional symptoms. (See ENGINE SYMPTOM TROUBLESHOOTING [YF (2.0L Zetec)].) • If any malfunction remains, inspect related service information and, repair or diagnosis accordingly. - If the vehicle is repaired, troubleshooting completed. - If the vehicle is not repaired or additional diagnostic information is not available, replace the PCM. (See PCM REMOVAL/INSTALLATION [YF (2.0L Zetec)].)