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