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Home >> Nissan-Datsun >> 2004 >> Pathfinder LE, RWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System >> DTC P0550: PSP Sensor >> Diagnostic Procedure
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Diagnostic Procedure

  1. RETIGHTEN GROUND SCREWS 
    1. Turn ignition switch "OFF".
    2. Loosen and retighten engine ground screws.
      Fig 1: Identifying Power Valve Actuator
      G00780789Courtesy of NISSAN MOTOR CO., U.S.A.
    1. GO TO 2.
  2. CHECK PSP SENSOR POWER SUPPLY CIRCUIT 
    1. Disconnect PSP sensor harness connector.
    2. Turn ignition switch "ON".
      Fig 2: Identifying Power Steering Pressure Sensor Harness Connector
      G00780790Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Check voltage between PSP sensor terminal 1 and ground with CONSULT-II or tester.
      Fig 3: Checking Voltage Between PSP Sensor Terminal 1 And Ground
      G00780791Courtesy of NISSAN MOTOR CO., U.S.A.

      Voltage: Approximately 5V 

    OK or NG 

    1. OK: GO TO  4 .
    2. NG: GO TO 3.
  3. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E132, E135
    • Harness connectors E116, M114
    • Harness connectors M32, F23
    • Harness for open or short between ECM and power steering pressure sensor
    1. Repair open circuit or short to ground or short to power in harness or connectors.
  4. CHECK PSP SENSOR GROUND CIRCUIT FOR OPEN AND SHORT 
    1. Turn ignition switch "OFF".
    2. Check harness continuity between PSP sensor terminal 3 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  6 .
    2. NG: GO TO 5.
  5. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E102, E48
    • Harness connectors E1, M1
    • Harness connectors M32, F23
    • Harness connectors F22, M33
    • Joint connector F204
    • Harness for open or short between ECM and PSP sensor
    • Harness for open or short between TCM and PSP sensor.
    1. Repair open circuit or short to ground or short to power in harness or connectors.
  6. 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. Refer to WIRING DIAGRAM  .

      Continuity should exist. 

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

    OK or NG 

    1. OK: GO TO  8 .
    2. NG: GO TO 7.
  7. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E102, E48
    • Harness connectors E1, M1
    • Harness connectors M32, F23
    • Harness for open or short between ECM and power steering pressure sensor
    1. Repair open circuit or short to ground or short to power in harness or connectors.
  8. CHECK PSP SENSOR 

    Refer to "COMPONENT INSPECTION  " .

    OK or NG 

    1. OK: GO TO 9.
    2. NG: Replace PSP sensor.
  9. CHECK INTERMITTENT INCIDENT 

    Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT  " .

    1. INSPECTION END 
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