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STEP
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INSPECTION
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RESULTS
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ACTION
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1
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Connect WDS or equivalent to DLC-2.
Retrieve any continuous memory, KOEO and KOER DTCs.
Are there any DTCs displayed?
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Yes
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DTC is displayed:
Go to appropriate DTC test.
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No
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No DTC is displayed:
Go to next step.
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2
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Start engine and run it at idle.
Turn A/C switch on.
Remove A/C relay.
Does A/C magnetic clutch disengage?
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Yes
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Inspect for following:
• A/C relay is stuck closed.
• Short to GND circuit between A/C relay and PCM terminal 4O.
If both items okay, go to next step.
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No
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Inspect if circuit between A/C relay and magnetic clutch shorts to battery power circuit.
If circuit is okay, inspect magnetic clutch stuck engagement or clearance.
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3
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Connect WDS or equivalent to DLC-2.
Access ACSW PID.
Start engine and turn A/C switch on.
Read ACSW PID while disconnecting refrigerant pressure switch connector.
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Note
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• ACSW PID should read OFF when disconnecting connector. If ACSW PID reading remains ON, short to GND circuit may be present.
Does ACSW PID reading remain ON?
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Yes
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Inspect for short to GND circuit between refrigerant pressure switch and PCM terminal 1AC.
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No
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Go to next step.
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4
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Reconnect refrigerant pressure switch connector.
Read ACSW PID while turning off A/C switch.
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Note
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• ACSW PID should read OFF when turning A/C switch off. If ACSW PID reading remains ON, short to GND circuit may be present.
Does ACSW PID reading remain ON?
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Yes
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Inspect following:
• Short to GND circuit between A/C switch and A/C amplifier
• Short to GND circuit between A/C amplifier and refrigerant pressure switch
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No
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Inspect for stuck closed A/C switch.
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5
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Verify test results.
• If okay, return to diagnostic index to service any additional symptoms.
• If malfunction remains, replace PCM.
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