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

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.

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

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.