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Home >> Nissan-Datsun >> 2006 >> Sentra SE-R >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Component Testing (Qr25DE) >> Refrigerant Pressure Sensor >> Diagnostic Procedure
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Diagnostic 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 switch ON.
    3. Check voltage between ECM terminal 70 and ground with CONSULT-II or tester.

      Voltage: 1.0 - 4.0V 

      4. Fig 1: Checking Voltage Between ECM Connector Terminal 70 And Ground
      G04077918Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: INSPECTION END 

    NG: GO TO  2.

  2. CHECK GROUND CONNECTIONS 
    1. Turn A/C switch and blower switch OFF.
    2. Stop engine and turn ignition switch OFF.
    3. Loosen and retighten engine two screws on the body.

      Refer to "GROUND INSPECTION ".

      Fig 2: Locating M28 & M54 Body Ground Screws
      G04166617Courtesy 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 harness connector.
    2. Turn ignition switch ON.
      Fig 3: Disconnecting Refrigerant Pressure Sensor Harness Connector
      G04192298Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Check voltage between refrigerant pressure sensor terminal 3 and ground with CONSULT-II or tester.

      Voltage: Approximately 5V 

      4. Fig 4: Checking Voltage Between Refrigerant Pressure Sensor Terminal 3 & Ground
      G04192299Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO  5.

    NG: GO TO  4.

  4. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E9, F47
    • 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. Disconnect TCM harness connector (A/T models).
    4. Check harness continuity between refrigerant pressure sensor terminal 1 and ECM terminal 67, TCM terminal 42.

      Refer to WIRING DIAGRAM .

      Continuity should exist. 

    5. 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 E10, F48
    • Harness for open or short between ECM and refrigerant pressure sensor
    • Harness for open or short between TCM and refrigerant pressure sensor (A/T models)

      : 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 WIRING DIAGRAM .

      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 E10, F48
    • 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 "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

    OK or NG 

    OK: Replace refrigerant pressure sensor.

    NG: Repair or replace.

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