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Diagnostic Procedure

WARNING: This page is about a different car, the 2005 Nissan Quest. However, it is still accessible from the selected car via links, so may be relevant.
  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 & Ground
      G02474710Courtesy of NISSAN MOTOR CO., U.S.A.
      • Voltage: 1.0 - 4.0V 

    OK or NG

    • OK: INSPECTION END 
    • NG: GO TO 2.
  2. CHECK GROUND CONNECTIONS 
    1. Turn ignition switch OFF.
    2. Loosen and retighten three ground screws on the body. Refer to "GROUND INSPECTION ".
      Fig 2: Loosening & Retightening Ground Screws
      G02474711Courtesy 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.
      Fig 3: Disconnecting Refrigerant Pressure Sensor Harness Connector
      G02474712Courtesy of NISSAN MOTOR CO., U.S.A.
    2. Turn ignition switch ON.
    3. Check voltage between refrigerant pressure sensor terminal 1 and ground with CONSULT-II or tester.
      Fig 4: Checking Voltage Between Refrigerant Pressure Sensor Terminal 1 & Ground
      G02474713Courtesy of NISSAN MOTOR CO., U.S.A.
      • Voltage: Approximately 5V 

    OK or NG

    • OK: GO TO  5.
    • NG: GO TO 4.
  4. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E19, F33
    • Harness for open or short between ECM and refrigerant pressure sensor
    • : Repair 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.
    4. Check harness continuity between refrigerant pressure sensor terminal 3 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 E19, F33
    • Harness for open or short between ECM and refrigerant pressure sensor
    • Harness for open or short between TCM 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 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 E19, F33
    • 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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