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Home >> Mazda >> 2002 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 336 (Symptom Troubleshooting (Engine Control System AJ)) >> No. 24 A/C Always On/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 ALWAYS ON/A/C COMPRESSOR RUNS CONTINUOUSLY [AJ] DIAGNOSTIC PROCEDURE

STEP INSPECTION 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 run it at idle.
  • 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 69
    • If both items are okay, go to the next step.
No 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.
3
  • Disconnect refrigerant pressure switch connector.
  • Start the engine and A/C switch on.
    NOTE:
    • A/C should not work when the connector disconnected. If A/C remains working, short to GND circuit may be present.
    • Does A/C remain working?
 Yes Inspect for short to GND circuit between refrigerant pressure switch and PCM terminal 5.
No Go to the next step.
4
  • Reconnect refrigerant pressure switch connector.
  • Turn off A/C switch.
    NOTE:
    • A/C should not work when the A/C switch is turned off. If A/C remains on, short to GND circuit may be present.
    • Does ACSW PID reading remain on?
 Yes Inspect for the 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 for stuck closed A/C switch.
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.
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