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Home >> Infiniti >> 2010 >> M45 Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Component Testing >> Refrigerant Pressure Sensor >> Diagnosis Procedure
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Diagnosis Procedure

  1. CHECK REFRIGERANT PRESSURE SENSOR OVERALL FUNCTION
    1. Start engine and warm it up to normal operating temperature.
    2. Turn A/C switch and blower fan switch ON.
    3. Check voltage between ECM terminal 70 and ground with CONSULT-III or tester.

    Voltage: 1.0 - 4.0 V 

    OK or NG 

    OK: INSPECTION END 

    NG: GO TO 2.

    Fig 1: Checking Voltage Between ECM Terminal 70 And Ground
    G04900823Courtesy of NISSAN MOTOR CO., U.S.A.
  2. CHECK GROUND CONNECTIONS
    1. Turn A/C switch and blower fan switch OFF.
    2. Turn ignition switch OFF.
    3. Loosen and retighten ground screws on the body.

    Refer to "GROUND INSPECTION ".

    Fig 2: Identifying Body Ground (M70 And M16)
    G06303527Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO 3.

    NG: Repair or replace ground connections.

  3. CHECK REFRIGERANT PRESSURE SENSOR POWER SUPPLY CIRCUIT
    1. Disconnect refrigerant pressure sensor (1) harness connector.
    2. Turn ignition switch ON.
      Fig 3: Identifying Refrigerant Pressure Sensor Harness Connector
      G05210248Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Check voltage between refrigerant pressure sensor terminal 1 and ground with CONSULT-III or tester.

    Voltage: Approximately 5 V 

    OK or NG 

    OK: GO TO  5.

    NG: GO TO 4.

    Fig 4: Checking Voltage Between Refrigerant Pressure Sensor Terminal 1 And Ground
    G04875300Courtesy of NISSAN MOTOR CO., U.S.A.
  4. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors E11, F2
    • Harness for open or short between ECM and refrigerant pressure sensor

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

  5. CHECK REFRIGERANT PRESSURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check harness continuity between refrigerant pressure sensor terminal 3 and ECM terminal 67.

      Refer to SYSTEM WIRING DIAGRAMS article.

      Continuity should exist  .

    4. Also check harness for short to ground and short to power.

    OK or NG 

    OK: GO TO  7.

    NG: GO TO 6.

  6. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors E11, F2
    • Harness for open or short between ECM and refrigerant pressure sensor

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

  7. CHECK REFRIGERANT PRESSURE SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
    1. Check harness continuity between ECM terminal 70 and refrigerant pressure sensor terminal 2.

      Refer to SYSTEM WIRING DIAGRAMS article.

      Continuity should exist  .

    2. Also check harness for short to ground and short to power.

    OK or NG 

    OK: GO TO  9.

    NG: GO TO 8.

  8. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors E11, F2
    • Harness for open or short between ECM and refrigerant pressure sensor

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

  9. CHECK INTERMITTENT INCIDENT

    Refer to "DIAGNOSIS PROCEDURE ".

    OK or NG 

    OK: Replace refrigerant pressure sensor.

    NG: Repair or replace malfunctioning part.

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