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Home >> Infiniti >> 2004 >> I35 >> 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 81 and ground with CONSULT-II or tester.
      Fig 1: Checking Voltage Between ECM Terminal And Ground
      G00787534Courtesy of NISSAN MOTOR CO., U.S.A.

    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. See Figure
    4. Turn ignition switch ON.
    5. Check voltage between refrigerant pressure sensor terminal 1 and ground with CONSULT-II or tester.
      6. Fig 2: Checking Voltage Between Refrigerant Pressure Sensor Terminal And Ground
      G00787536Courtesy 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 E15, F18
    • 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 3 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 E8, F17
    • Harness for open between ECM and refrigerant pressure sensor
    • Harness for open between TCM (Transmission control module) and refrigerant pressure sensor
    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 81 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 E8, F17
    • 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 REFRIGERATION CYCLE .

    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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