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Home >> Nissan-Datsun >> 2006 >> Sentra SE-R >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P0447 To P0850 (Qr25DE) >> DTC P0550 PSP Sensor >> Diagnostic Procedure

Diagnostic Procedure

  1. CHECK GROUND CONNECTIONS 
    1. Turn ignition switch OFF.
    2. Loosen and retighten engine two screws on the body.

      Refer to "GROUND INSPECTION ".

    Fig 1: Locating M28 & M54 Body Ground Screws
    G04166617Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO  2.

    NG: Repair or replace ground connections.

  2. CHECK POWER STEERING PRESSURE SENSOR POWER SUPPLY CIRCUIT 
    1. Disconnect power steering pressure (PSP) sensor harness connector.
    2. Turn ignition switch ON.
      Fig 2: Disconnecting Power Steering Pressure Sensor Harness Connector
      G04192071Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Check voltage between power steering pressure sensor terminal 1 and ground with CONSULT-II or tester.

      Voltage: Approximately 5V 

      4. Fig 3: Checking Voltage Between Power Steering Pressure Sensor Terminal 1 & Ground
      G04192072Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO  3.

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

  3. CHECK POWER STEERING 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 power steering pressure sensor terminal 3 and ECM terminal 67, TCM terminal 42 (A/T models).

      Continuity should exist. 

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

    OK or NG 

    OK: GO TO  5.

    NG: GO TO  4.

  4. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness for open or short between power steering pressure sensor and ECM
    • Harness for open or short between power steering pressure sensor and TCM (A/T models)

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

  5. CHECK POWER STEERING PRESSURE SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
    1. Disconnect ECM harness connector.
    2. Check harness continuity between ECM terminal 12 and power steering pressure sensor terminal 2.

      Continuity should exist. 

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

    OK or NG 

    OK: GO TO  6.

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

  6. CHECK POWER STEERING PRESSURE SENSOR 

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO  7.

    NG: Replace power steering pressure sensor.

  7. CHECK INTERMITTENT INCIDENT 

    Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

    : INSPECTION END 

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