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Home >> Mazda >> 2002 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 335 (Symptom Troubleshooting (Engine Control System L3)) >> No. 24 A/C Is Always On Or A/C Compressor Runs Continuously >> Diagnostic procedure

Diagnostic procedure

WARNING: This page is about a different car, the 2005 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
NO. 24 A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY DIAGNOSTIC PROCEDURE

STEP INSPECTION RESULTS ACTION
1 Connect WDS or equivalent to DLC-2.
Turn ignition switch to ON position (Engine off).
Retrieve any DTCs.
Are there any DTCs displayed?		 Yes DTC is displayed: 
Go to appropriate DTC test.
No No DTC is displayed: 
Go to the next step.
2 Start engine and idle it.
Turn A/C switch on.
Remove A/C relay.
Does A/C magnetic clutch disengage?		 Yes Inspect for the following:
  • A/C relay is stuck closed.
  • Short to GND circuit between A/C relay and PCM terminal 47(1), 4O(2).

If both items okay, go to the next step.
No Inspect if circuit between A/C relay and magnetic clutch shorts to battery power circuit.
3 Disconnect refrigerant pressure switch connector.
Start engine and turn A/C switch on.
NOTE:
  • A/C should not work when disconnecting connector. If A/C remains working, short to GND circuit may be present.

    If circuit is okay, inspect magnetic clutch for stuck engagement or clearance.


Does A/C remain working?		 Yes Inspect for short to GND circuit between refrigerant pressure switch and PCM terminal 5(1), 1AC(2).
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 GND circuit may be present.

Does A/C remain working?		 Yes 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
No Inspect whether A/C switch is stuck closed.
5 Verify test results.
  • If okay, return to diagnostic index to service any additional symptoms.
  • If malfunction remains, inspect related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis.
    • If vehicle is repaired, troubleshooting completed.
    • If vehicle is not repaired or additional diagnostic information is not available, reprogram PCM if later calibration is available. Retest.
(1) California emission regulation applicable ATX model
(2) Except for California emission regulation applicable ATX model
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