LEMON Manuals: Even more car manuals for everyone
Home >> Mazda >> 2006 >> 6 s, 4D Wagon, Automatic >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 10 (Symptom Troubleshooting [Engine Control System L3 With TC)) >> No. 24 A/C Is Always On Or A/C Compressor Runs Continuously >> Diagnostic procedure

Diagnostic procedure

WARNING: This page is about a different variant/trim than selected.
DIAGNOSTIC PROCEDURE

STEP INSPECTION ACTION
1 Connect the WDS or equivalent to the DLC-2.
Turn the ignition switch to the ON position (Engine off).
Retrieve any DTCs.
Are there any DTCs displayed?		 Yes DTC is displayed: 
Go to the appropriate DTC test.
No No DTC is displayed: 
Go to the next step.
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?		 Yes Inspect for the following:
  • A/C relay is stuck closed.
  • Short to ground circuit between A/C relay and PCM terminal 4N.

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

Does A/C remain working?		 Yes Inspect for a short to ground circuit between refrigerant pressure switch and PCM terminal 1AC.
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 ground circuit may be present.

Does A/C remain working?		 Yes Inspect for the following:
  • Short to ground circuit between A/C switch and A/C amplifier
  • Short to ground circuit between A/C amplifier and refrigerant pressure switch
No Inspect the whether A/C switch is stuck closed.
5 Verify test results.
  • If normal, return to the diagnostic index to service any additional symptoms.
  • If a malfunction remains, inspect the related Service Bulletins and/or On-line Repair Information and perform the repair or diagnosis.
    • If the vehicle is repaired, troubleshooting is completed.
    • If the vehicle is not repaired or additional diagnostic information is not available, reprogram the PCM if a later calibration is available. Retest.
scientia non olet · About LEMON Manuals