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Home >> Infiniti >> 2024 >> Q50 Luxe, AWD >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System (2 Of 2) >> Component Parts/Circuit Diagnosis >> Refrigerant Pressure Sensor >> Diagnosis Procedure

Diagnosis Procedure

  1. CHECK GROUND CONNECTION 
    1. Turn A/C switch and blower fan switch OFF.
    2. Turn ignition switch OFF.
    3. Check ground connection E191. Refer to Ground Inspection in Inspection .

    Is the inspection result normal?

    YES>>

    GO TO 2.

    NO>>

    Repair or replace ground connection.

  2. CHECK REFRIGERANT PRESSURE SENSOR POWER SUPPLY 
    1. Disconnect refrigerant pressure sensor harness connector.
    2. Turn ignition switch ON.
    3. Check the voltage between refrigerant pressure sensor harness connector and ground.
      Refrigerant pressure sensor Ground Voltage (V)
      Connector Terminal
      E162 3 Ground Approx. 5

    Is the inspection result normal?

    YES>>

    GO TO 4.

    NO>>

    GO TO 3.

  3. CHECK REFRIGERANT PRESSURE SENSOR POWER SUPPLY CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check the continuity between refrigerant pressure sensor harness connector and ECM harness connector.
      Refrigerant pressure sensor ECM Continuity
      Connector Terminal Connector Terminal
      E162 3 F142 136 Existed
    4. Also check harness for short to ground and short to power.

    Is the inspection result normal?

    YES>>

    Check sensor power supply 2 circuit. Refer to Diagnosis Procedure .

    NO>>

    Repair or replace error-detected parts.

  4. CHECK REFRIGERANT PRESSURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check the continuity between refrigerant pressure sensor harness connector and ECM harness connector.
      Refrigerant pressure sensor ECM Continuity
      Connector Terminal Connector Terminal
      E162 1 F142 125 Existed
    4. Also check harness for short to ground and short to power.

    Is the inspection result normal?

    YES>>

    GO TO 5.

    NO>>

    Repair or replace error-detected parts.

  5. CHECK REFRIGERANT PRESSURE SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
    1. Check the continuity between refrigerant pressure sensor harness connector and ECM harness connector.
      Refrigerant pressure sensor ECM Continuity
      Connector Terminal Connector Terminal
      E162 2 F142 108 Existed
    2. Also check harness for short to ground and short to power.

    Is the inspection result normal?

    YES>>

    GO TO 6.

    NO>>

    Repair or replace error-detected parts.

  6. CHECK INTERMITTENT INCIDENT 

    Refer to Inspection . Is the inspection result normal?

    YES>>

    Replace refrigerant pressure sensor. Refer to CONDENSER : Exploded View .

    NO>>

    Repair or replace error-detected parts.

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