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Home >> Mazda >> 2006 >> 6 s, 4D Wagon, Automatic >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 2 (Symptom Troubleshooting [Engine Control System L3)) >> No. 23 A/C Does Not Work Sufficiently >> Diagnostic procedure

Diagnostic procedure

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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 Disconnect A/C compressor connector.
Start engine and turn 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 GND condition of magnetic clutch on A/C compressor.
If GND condition is okay, inspect for open circuit magnetic clutch coil.
No Go to the next step.
3 Disconnect 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 ignition switch to ON position.
Access AC_REQ PID using WDS or equivalent.
Turn A/C switch on and set blower fan to any speed.
Does the PID turn ON and OFF properly?		 Yes Inspect refrigerant pressure switch operation.
If switch is okay, 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 1AU
  • 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 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 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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