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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 >> Intake Sensor >> Diagnosis Procedure

Diagnosis Procedure

  1. CHECK VOLTAGE BETWEEN INTAKE SENSOR AND GROUND 
    1. Disconnect intake sensor connector.
    2. Turn ignition switch ON.
    3. Check voltage between intake sensor harness connector and ground.
      (+) (-) Voltage
      Intake sensor -
      Connector Terminal
      M77 1 Ground Approx. 5 V

      Is the inspection result normal? 

      YES: GO TO 2.

      NO: GO TO  4.

  2. CHECK CIRCUIT CONTINUITY BETWEEN INTAKE SENSOR AND UNIFIED METER AND A/C AMP. 
    1. Turn ignition switch OFF.
    2. Disconnect unified meter and A/C amp. connector.
    3. Check continuity between intake sensor harness connector and unified meter and A/C amp. harness connector.
      Intake sensor Unified meter and A/C amp. Continuity
      Connector Terminal Connector Terminal
      M77 2 M67 59 Existed

      Is the inspection result normal? 

      YES: GO TO 3.

      NO: Repair harness or connector.

  3. CHECK INTAKE SENSOR 

    Check intake sensor. Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: Replace unified meter and A/C amp.

    NO: Replace intake sensor.

  4. CHECK CIRCUIT CONTINUITY BETWEEN INTAKE SENSOR AND UNIFIED METER AND A/C AMP. 
    1. Turn ignition switch OFF.
    2. Disconnect unified meter and A/C amp. connector.
    3. Check continuity between intake sensor harness connector and unified meter and A/C amp. harness connector.
      Intake sensor Unified meter and A/C amp. Continuity
      Connector Terminal Connector Terminal
      M77 1 M67 43 Existed
    4. Check continuity between intake sensor harness connector and ground.
      Intake sensor - Continuity
      Connector Terminal
      M77 1 Ground Not existed

      Is the inspection result normal? 

      YES: Replace unified meter and A/C amp.

      NO: Repair harness or connector.

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