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Home › Mazda › 2006 › 6 Mazdaspeed › Repair and Diagnosis › Engine Performance › System › Symptom Troubleshooting [Engine Control System L3 With TC) › No. 23 A/C Does Not Work Sufficiently › Diagnostic procedure

Diagnostic procedure

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 Disconnect the A/C compressor connector.
Start the engine and turn the A/C switch on.
Is there correct voltage at terminal of A/C compressor magnetic clutch connector?
Specification 
10.5 V or more 		 Yes Inspect for the ground condition of magnetic clutch on A/C compressor.
If ground condition is normal, inspect for an open circuit magnetic clutch coil.
No Go to the next step.
3 Disconnect the refrigerant pressure switch connector.
Connect jumper wire between terminals of A/C high-pressure switch connector.
Connect jumper wires between terminals of refrigerant pressure switch connector.
Turn the ignition switch to the ON position.
Turn A/C switch on and set blower fan to any speed.
Does A/C work?		 Yes Inspect the refrigerant pressure switch operation.
If switch is normal, go to the next step.
No Inspect for the following:
  • A/C switch is stuck open.
  • Open circuit between refrigerant pressure switch and PCM terminal 1AC
  • Open circuit between blower motor fan switch and resistor (if blower motor does not operate)
  • Evaporator temperature sensor and A/C amplifier
4 Remove jumper wire from switch connector.
Reconnect connector to refrigerant pressure switch.
Start engine and turn A/C switch on. Does fan operate?		 Yes Inspect the whether A/C relay is stuck open.
Replace if necessary.
No Inspect the following and repair or replace if necessary:
  • Refrigerant charging amount
  • A/C compressor for seizure
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.
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