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Home >> Nissan-Datsun >> 2004 >> Sentra SE-R >> Repair and Diagnosis >> External Pages >> Different car >> Section 1110 (Engine Control System) >> DTC P0550: PSP Sensor >> Diagnostic Procedure
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Diagnostic Procedure

WARNING: This page is about a different car, the 2004 Nissan Murano. However, it is still accessible from the selected car via links, so may be relevant.
  1. RETIGHTEN GROUND SCREWS 
    1. Turn ignition switch OFF.
    2. Loosen and retighten engine ground screws.
    1. GO TO 2.
      Fig 1: Tightening Engine Ground Screws
      G00782621Courtesy of NISSAN MOTOR CO., U.S.A.
  2. CHECK PSP SENSOR POWER SUPPLY CIRCUIT 
    1. Disconnect PSP sensor harness connector.
    2. Turn ignition switch ON.
      Fig 2: Disconnecting Power Steering Pressure Sensor Harness Connector
      G00782622Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 3: Checking Voltage Between Power Steering Pressure Sensor Harness Connector Terminal And Ground
      G00782623Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Check voltage between PSP sensor terminal 3 and ground with CONSULT-II or tester.

    Voltage: Approximately 5V 

    OK or NG 

    1. OK: GO TO 3.
    2. NG: Repair open circuit or 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. Check harness continuity between PSP sensor terminal 1 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  5.
    2. NG: GO TO 4.
  4. DETECT MALFUNCTIONING PART 

    Check the following.

    • Joint connector-3
    • Harness for open or short between power steering pressure sensor and ECM
    1. Repair open circuit or short to power in harness or connectors.
  5. CHECK PSP SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
    1. Disconnect ECM harness connector.
    2. Check harness continuity between ECM terminal 12 and PSP sensor terminal 2.

      Continuity should exist. 

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

    OK or NG 

    1. OK: GO TO 6.
    2. NG: Repair open circuit or short to ground or short to power in harness or connectors.
  6. CHECK PSP SENSOR 

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    1. OK: GO TO 7.
    2. NG: Replace PSP sensor.
  7. CHECK INTERMITTENT INCIDENT 

    Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

    1. : INSPECTION END 
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