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Home >> Nissan-Datsun >> 2009 >> Maxima S >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Component Testing >> Refrigerant Pressure Sensor >> Diagnosis Procedure
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Diagnosis Procedure

  1. CHECK GROUND CONNECTION
    1. Turn A/C switch and blower fan switch OFF.
    2. Stop engine.
    3. Turn ignition switch OFF.
    4. Check ground connection E9. Refer to Ground Inspection in "CIRCUIT INSPECTION ".

      Is the inspection result normal? 

      YES: GO TO 2.

      NO: Repair or replace ground connection.

  2. CHECK REFRIGERANT PRESSURE SENSOR POWER SUPPLY CIRCUIT
    1. Disconnect refrigerant pressure sensor harness connector.
    2. Turn ignition switch ON.
    3. Check the voltage between refrigerant pressure sensor harness connector and ground.
      VOLTAGE SPECIFICATION

      Refrigerant pressure sensor Ground Voltage (V)
      Connector Terminal
      E219 1 Ground Approx. 5
      Fig 1: Checking Voltage Between Refrigerant Pressure Sensor Harness Connector And Ground
      G05870005Courtesy of NISSAN MOTOR CO., U.S.A.

    Is the inspection result normal? 

    YES: GO TO 4.

    NO: GO TO 3.

  3. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors E3, F1
    • Junction block connectors E44, E45
    • IPDM E/R harness connectors E18, E201
    • Harness for open or short between ECM and refrigerant pressure sensor

      : Repair open circuit, short to ground or short to power in harness or connectors.

  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.
      CONTINUITY CHART

      Refrigerant pressure sensor ECM Continuity
      Connector Terminal Connector Terminal
      E219 3 F13 40 Existed
    4. Also check harness for short to ground and short to power.

      Is the inspection result normal? 

    YES: GO TO 6.

    NO: GO TO 5.

  5. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors E3, F1
    • IPDM E/R harness connectors E18, E201
    • Harness for open or short between ECM and refrigerant pressure sensor

      : Repair open circuit, short to ground or short to power in harness or connectors.

  6. 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.
      CONTINUITY CHART

      Refrigerant pressure sensor ECM Continuity
      Connector Terminal Connector Terminal
      E219 2 F13 39 Existed
    2. Also check harness for short to ground and short to power.

      Is the inspection result normal? 

    YES: GO TO 8.

    NO: GO TO 7.

  7. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors E3, F1
    • IPDM E/R harness connectors E18, E201
    • Harness for open or short between ECM and refrigerant pressure sensor

      : Repair open circuit, short to ground or short to power in harness or connectors.

  8. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    Is the inspection result normal? 

    YES: Replace refrigerant pressure sensor.

    NO: Repair or replace malfunctioning part.

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