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Home › Mazda › 2006 › 5 Touring, 2.3 L › Repair and Diagnosis › Engine Performance › System › Symptom Troubleshooting [Engine Control System L3) › No. 23 A/C Does Not Work Sufficiently › Diagnostic Procedure

Diagnostic Procedure

DIAGNOSTIC PROCEDURE CHART

STEP INSPECTION RESULTS 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 inspection.
(See DTC TABLE ).
No No DTC is displayed: 
Go to the next step.
2 Disconnect A/C compressor connector.
Start engine and turn A/C switch on.
Is there correct voltage at A/C compressor magnetic clutch terminal?
Specification 
10.5 V or more 		 Yes Inspect for GND condition of magnetic clutch on A/C compressor.
If GND condition is normal, inspect for open circuit magnetic clutch coil.
No Go to the next step.
3 Disconnect refrigerant pressure switch connector.
Connect jumper wiring between A/C high pressure switch terminal.
Connect jumper wiring between refrigerant pressure switch terminal.
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 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 in wiring harness between refrigerant pressure switch and PCM terminal 1AP
  • Open circuit in wiring harness between blower motor fan switch and resistor (if blower motor does not operate)
  • Evaporator temperature sensor and A/C amplifier
4 Remove jumper wiring from the switch connector.
Reconnect connector to refrigerant pressure switch.
Start the engine and turn the A/C switch on.
Does the fan operate?		 Yes Inspect 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 diagnostic index to service any additional symptoms.

      (See ENGINE SYMPTOM TROUBLESHOOTING ).

    • 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, replace the PCM.

        (See PCM REMOVAL/INSTALLATION ).
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