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Home >> Infiniti >> 2013 >> FX37 Base, RWD >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Heater & Air Conditioning Control System (Automatic Air Conditioning) >> DTC/Circuit Diagnosis >> Magnet Clutch >> Diagnosis Procedure

Diagnosis Procedure

  1. PERFORM SELF-DIAGNOSIS 

    Perform self-diagnosis function. Refer to "WITHOUT ACCS: DIAGNOSIS DESCRIPTION " (WITHOUT ACCS) or "WITH ACCS: DIAGNOSIS DESCRIPTION " (WITH ACCS).

    Is the inspection result normal? 

    YES: INSPECTION END

    NO: GO TO 2.

  2. PERFORM IPDM E/R AUTO ACTIVE TEST 

    Perform IPDM E/R auto active test. Refer to "DIAGNOSIS DESCRIPTION ".

    Does the magnet clutch operate? 

    YES-1: WITH CONSULT: GO TO 5.

    YES-2: WITHOUT CONSULT: GO TO  6.

    NO: Check 10A fuse (No. 49, located in IPDM E/R), and GO TO 3.

  3. CHECK CIRCUIT CONTINUITY BETWEEN IPDM E/R AND COMPRESSOR 
    1. Turn ignition switch OFF.
    2. Disconnect IPDM E/R connector and compressor connector.
    3. Check continuity between IPDM E/R harness connector and compressor harness connector.
      IPDM E/R Compressor Continuity
      Connector Terminal Connector Terminal
      E7 48 F43 1 Existed

      Is the inspection result normal? 

      YES: GO TO 4.

      NO: Repair harness or connector.

  4. CHECK MAGNET CLUTCH CIRCUIT 

    Check for operation sound when applying battery voltage direct current to terminal.

    Is the inspection result normal? 

    YES: Replace IPDM E/R.

    NO-1: VQ37VHR: Replace magnet clutch. Refer to "MAGNET CLUTCH: REMOVAL AND INSTALLATION OF COMPRESSOR CLUTCH ".

    NO-2: VK50VE: Replace compressor. Refer to "REMOVAL AND INSTALLATION ".

  5. CHECK ECM INPUT SIGNAL-1 

    Check A/C switch signal in "Data monitor". Refer to "WITHOUT ACCS: CONSULT FUNCTION " (WITHOUT ACCS) or "WITH ACCS: CONSULT FUNCTION " (WITH ACCS).

    A/C SWITCH ON: AIR COND SIG On 

    A/C SWITCH OFF: AIR COND SIG Off 

    Is the inspection result normal? 

    YES: GO TO  8.

    NO: GO TO 6.

  6. CHECK REFRIGERANT PRESSURE SENSOR 

    WITH CONSULT

    1. Start the engine.
    2. Check voltage of refrigerant pressure sensor in "Data monitor". Refer to "REFERENCE VALUE " (VQ37VHR) or "REFERENCE VALUE " (VK50VE).

    WITHOUT CONSULT

    1. Start the engine.
    2. Check voltage between ECM harness connector and ground.
      VOLTAGE REFERENCE (VQ37VHR)

      (+) (-) Condition Voltage
      ECM -
      connector Terminal
      M107 105 Ground A/C switch: ON (Blower motor operates.) Approx. 1.0 - 4.0 V
      VOLTAGE REFERENCE (VK50VE)

      (+) (-) Condition Voltage
      ECM -
      connector Terminal
      F111 90 Ground A/C switch: ON (Blower motor operates.) Approx. 1.0 - 4.0 V

      Is the inspection result normal? 

      YES:

      • WITH CONSULT: GO TO 7.
      • WITHOUT CONSULT: Repair harness or connector.

      NO: Refer to "DIAGNOSIS PROCEDURE " (VQ37VHR) or "DIAGNOSIS PROCEDURE " (VK50VE).

  7. CHECK ECM INPUT SIGNAL-2 

    Check blower fan motor switch signal in "Data monitor". Refer to "WITHOUT ACCS: CONSULT FUNCTION " (WITHOUT ACCS) or "WITH ACCS: CONSULT FUNCTION " (WITH ACCS).

    FAN SWITCH ON: HEATER FAN SW On 

    FAN SWITCH OFF: HEATER FAN SW Off 

    Is the inspection result normal? 

    YES: GO TO 8.

    NO: Repair harness or connector.

  8. CHECK CAN COMMUNICATION 

    Check CAN communication. Refer to "TROUBLE DIAGNOSIS FLOW CHART ".

    • ECM - IPDM E/R
    • ECM - Unified meter and A/C amp.

    Is the inspection result normal? 

    YES: Replace ECM.

    NO: Repair or replace malfunctioning part(s).

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