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

id0103b4803000

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 ground between A/C switch and PCM • Short to ground circuit between A/C relay and PCM • A/C relay to magnetic clutch circuit shorted to battery power

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 test.
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 ground circuit between A/C relay and PCM terminal 4N. If both items normal, go to the next step.
No | Inspect if circuit between A/C relay and magnetic clutch shorts to battery power circuit. If circuit is normal, inspect magnetic clutch for stuck engagement or clearance.
3 | Disconnect the refrigerant pressure switch connector. Start the engine and turn the A/C switch on. Note • A/C should not work when disconnecting connector. If A/C remains working, short to ground circuit may be present. Does A/C remain working? | Yes | Inspect for a short to ground circuit between refrigerant pressure switch and PCM terminal 1AC.
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 ground circuit may be present. Does A/C remain working? | Yes | Inspect for the following: • Short to ground circuit between A/C switch and A/C amplifier • Short to ground circuit between A/C amplifier and refrigerant pressure switch
No | Inspect the whether A/C switch is stuck closed.
5 | Verify test results. • If normal, return to the diagnostic index to service any additional symptoms. • If a malfunction remains, inspect the related Service Bulletins and/or On-line Repair Information and perform the repair or diagnosis. - If the vehicle is repaired, troubleshooting is completed. - If the vehicle is not repaired or additional diagnostic information is not available, reprogram the PCM if a later calibration is available. Retest.le. Retest.