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Home >> Nissan-Datsun >> 2009 >> Maxima S >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P0451 To P1217 >> P0550 PSP Sensor >> Diagnosis Procedure
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Diagnosis Procedure

  1. CHECK GROUND CONNECTION
    1. Turn ignition switch OFF.
    2. Check ground connection E9. Refer to Ground Inspection in "CIRCUIT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 2.

    NO: Repair or replace ground connection.

  2. CHECK PSP SENSOR POWER SUPPLY CIRCUIT
    1. Disconnect power steering pressure (PSP) sensor harness connector.
    2. Turn ignition switch ON.
    3. Check the voltage between PSP sensor harness connector and ground.
    VOLTAGE SPECIFICATION

    PSP sensor Ground Voltage
    Connector Terminal
    F40 1 Ground Approx. 5 V
    Fig 1: Checking Voltage Between PSP Sensor Harness Connector And Ground
    G05869895Courtesy of NISSAN MOTOR CO., U.S.A.

    Is the inspection result normal? 

    YES: GO TO 3.

    NO: Repair open circuit, short to ground or short to power in harness or connectors.

  3. CHECK PSP SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check the continuity between PSP sensor harness connector and ECM harness connector.
      CONTINUITY CHART

      PSP sensor ECM Continuity
      Connector Terminal Connector Terminal
      F40 3 F13 48 Existed
    4. Also check harness for short to ground and short to power.

    Is the inspection result normal? 

    YES: GO TO 4.

    NO: Repair open circuit, short to ground short to power in harness or connectors.

  4. CHECK PSP SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
    1. Check the continuity between PSP sensor harness connector and ECM harness connector.
      CONTINUITY CHART

      PSP sensor ECM Continuity
      Connector Terminal Connector Terminal
      F40 2 F13 41 Existed
    2. Also check harness for short to ground and short to power.

      Is the inspection result normal? 

      YES: GO TO 5.

      NO: Repair open circuit, short to ground or short to power in harness or connectors.

  5. CHECK PSP SENSOR

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 6.

    NO: Replace PSP sensor.

  6. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    : INSPECTION END

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