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Home › Nissan-Datsun › 2008 › 350Z 2D Convertible, Standard › Repair and Diagnosis › Engine Performance › Engine Control Systems › Engine Control System - DTCS P0448 To P1212 › DTC P0550 PSP Sensor › Diagnostic Procedure

Diagnostic Procedure

  1. CHECK GROUND CONNECTIONS 

    Models with FDC system, navigation system or telephone 

    1. Turn ignition switch OFF.
    2. Loosen and retighten ground screws on the body. Refer to "GROUND INSPECTION ".
      Fig 1: Identifying Body Ground Screws (Models With FDC System)
      G04875171Courtesy of NISSAN MOTOR CO., U.S.A.

    Models without FDC system, navigation system and telephone 

    1. Turn ignition switch OFF.
    2. Loosen and retighten ground screws on the body. Refer to "GROUND INSPECTION ".
      Fig 2: Identifying Body Ground Screws (Models Without FDC System)
      G04875172Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO 2.

    NG: Repair or replace ground connections.

  2. CHECK PSP SENSOR POWER SUPPLY CIRCUIT 
    1. Disconnect power steering pressure (PNP) sensor (1) harness connector.
    2. Turn ignition switch ON.
      Fig 3: Identifying Power Steering Pressure Sensor
      G04875295Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Check voltage between PSP sensor terminal 1 and ground with CONSULT-III or tester.

      Voltage: Approximately 5V 

      OK or NG 

    OK: GO TO 3.

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

    Fig 4: Checking Voltage Between PSP Sensor Terminal 1 And Ground
    G04875300Courtesy of NISSAN MOTOR CO., U.S.A.
  3. CHECK PSP SENSOR GROUND CIRCUIT FOR OPEN AND SHORT 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check harness continuity between PSP sensor terminal 3 and ECM terminal 96. Refer to WIRING DIAGRAM .

      Continuity should exist  .

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

    OK or NG 

    OK: GO TO 4.

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

  4. CHECK PSP SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
    1. Check harness continuity between ECM terminal 87 and PSP 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 5.

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

  5. CHECK PSP SENSOR 

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO 6.

    NG: Replace PNP sensor.

  6. CHECK INTERMITTENT INCIDENT 

    Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

    : INSPECTION END 

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