Diagnostic procedure
STEP
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INSPECTION
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RESULTS
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ACTION
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---|---|---|---|
1
|
Connect the WDS or equivalent to the DLC-2.
Retrieve any continuous memory, KOEO and KOER DTCs.
(See KOEO/KOER SELF-TEST.)
Are there any DTCs displayed?
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Yes
|
DTC is displayed:
Go to the appropriate DTC test.
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No
|
No DTC is displayed:
Go to the next step.
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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?
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Yes
|
Inspect for the following:
• A/C relay is stuck closed.
• Short to ground circuit between the A/C relay and PCM terminal 1AL.
If both items are normal, go to the next step.
|
No
|
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
|
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.
|
Yes
|
Inspect for a short to ground circuit between the refrigerant pressure switch and the PCM terminal 1Q.
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No
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Go to the next step.
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4
|
Reconnect the refrigerant pressure switch connector.
Read the ACSW PID while turning off the A/C switch.
|
Yes
|
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
|
No
|
Inspect if the A/C switch is 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, inspect related Service information and perform repair or diagnosis.
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