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NO.24 A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY [L8, LF, L3]

id0103a1803000

24 | A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY.
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DESCRIPTION | A/C compressor magnetic clutch does not disengage.
POSSIBLE CAUSE | • A/C compressor magnetic clutch engagement is stuck. • 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

Diagnostic procedure

STEP | INSPECTION | RESULTS | ACTION
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1 | Connect the WDS or equivalent to the DLC-2. Turn the ignition switch to the ON position (Engine off). Retrieve any DTCs. Are there any DTCs displayed? | Yes | DTC is displayed: Go to the appropriate DTC inspection. (See DTC TABLE [L8, LF, L3].)
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 the following: • A/C relay is stuck closed. • Short to GND in wiring harness between A/C relay and PCM terminal 1I. If both items normal, go to the next step.
No | Inspect if circuit between the A/C relay and magnetic clutch shorts to battery power circuit. If the circuit is normal, inspect the magnetic clutch for stuck engagement or clearance.
3 | Disconnect refrigerant pressure switch connector. Start the engine and turn A/C switch on. Note • A/C should not work when disconnecting connector. If A/C remains working, short to GND circuit may be present. Does the A/C remain working? | Yes | Inspect for short to GND in wiring harness between refrigerant pressure switch and PCM terminal 1AU.
No | Go to the next step.
4 | Reconnect refrigerant pressure switch connector. Turn off A/C switch. Note • A/C should not work when turning A/C switch off. If A/C remains working, short to GND circuit may be present. Does A/C remain working? | Yes | Inspect following: • Short to GND in wiring harness between A/C switch and A/C amplifier • Short to GND circuit between A/C amplifier and refrigerant pressure switch
No | Inspect whether A/C switch is stuck closed.
5 | • Verify test results. - If normal, return to diagnostic index to service any additional symptoms. (See ENGINE SYMPTOM TROUBLESHOOTING [L8, LF, L3].) - If malfunction remains, inspect related Service Information and perform repair or diagnosis. • If vehicle is repaired, troubleshooting completed. • If vehicle is not repaired or additional diagnostic information is not available, replace the PCM. (See PCM REMOVAL/INSTALLATION [L8, LF, L3].)