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Home >> Nissan-Datsun >> 2004 >> Pathfinder LE, 4WD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System >> 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.
      Fig 1: Checking Voltage Between ECM Terminal 70 And Ground
      G00781357Courtesy of NISSAN MOTOR CO., U.S.A.

      Voltage: 1 - 4V 

    OK or NG 

    1. OK INSPECTION END 
    2. NG GO TO 2.
  2. CHECK REFRIGERANT PRESSURE SENSOR POWER SUPPLY CIRCUIT 
    1. Turn A/C switch and blower switch "OFF".
    2. Stop engine.
    3. Disconnect refrigerant pressure sensor harness connector.
      Fig 2: Identifying Refrigerant Pressure Sensor Harness Connector
      G00781358Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Turn ignition switch "ON".
    5. Check voltage between refrigerant pressure sensor terminal 3 and ground with CONSULT-II or tester.

      Voltage: Approximately 5V 

      Fig 3: Checking Voltage Between Refrigerant Pressure Sensor Terminal 3 And Ground
      G00781359Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK GO TO  4 .
    2. NG GO TO 3.
  3. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E1, M1
    • Harness connectors M32, F23
    • Harness for open or short between ECM and refrigerant pressure sensor
    1. Repair harness or connectors.
  4. CHECK REFRIGERANT PRESSURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT 
    1. Turn ignition switch "OFF".
    2. Check harness continuity between refrigerant pressure sensor terminal 1 and engine ground. Refer to WIRING DIAGRAM  .

      Continuity should exist. 

    3. Also check harness for short to power.

    OK or NG 

    1. OK GO TO  6 .
    2. NG GO TO 5.
  5. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E116, M114
    • Harness connectors M94, F27
    • Joint connector F204
    • Harness for open between ECM and refrigerant pressure sensor
    • Harness connectors F22, M33 (A/T models)
    • Harness for open between TCM and refrigerant pressure sensor (A/T models)
    1. Repair open circuit or short to power in harness or connectors.
  6. CHECK REFRIGERANT PRESSURE SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
    1. Disconnect ECM harness connector.
    2. Check harness continuity between ECM terminal 70 and refrigerant pressure sensor terminal 2. Refer to WIRING DIAGRAM  .

      Continuity should exist. 

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

    OK or NG 

    1. OK GO TO  8 .
    2. NG GO TO 7.
  7. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E1, M1
    • Harness connectors M94, F27
    • Harness for open or short between ECM and refrigerant pressure sensor
    1. Repair open circuit or short to ground or short to power in harness or connectors.
  8. CHECK REFRIGERANT PRESSURE SENSOR 

    Refer to "REFRIGERANT PRESSURE SENSOR ".

    OK or NG 

    1. OK GO TO 9.
    2. NG Replace refrigerant pressure sensor.
  9. CHECK INTERMITTENT INCIDENT 

    Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT  " .

    1. INSPECTION END
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