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Home >> Infiniti >> 2013 >> M56 Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P0190 To P1084 >> DTC P0550: PSP Sensor >> Diagnosis Procedure
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Diagnosis Procedure

  1. CHECK POWER STEERING PRESSURE SENSOR POWER SUPPLY-I 
    1. Disconnect power steering pressure (PSP) sensor connector.
    2. Turn ignition switch ON.
    3. Check the voltage between PSP sensor harness connector terminals.
      PSP sensor Voltage (Approx.)
      Connector + -
      terminal
      F35 3 1 5 V

      Inspection result normal? 

      YES: GO TO  6.

      NO: GO TO 2.

  2. CHECK POWER STEERING PRESSURE SENSOR POWER SUPPLY-II 

    Check the voltage between PSP sensor harness connector and the ground.

    + - Voltage (Approx.)
    PSP sensor
    Connector Terminal
    F35 3 Ground 5 V

    Is inspection result normal? 

    YES: GO TO  4.

    NO: GO TO 3.

  3. CHECK SENSOR POWER SUPPLY CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check harness connector for short to power and short to ground, between the following terminals.
      ECM Sensor
      Connector Terminal Name Connector Terminal
      F110 27 Power steering pressure sensor F35 3
      Low fuel pressure sensor F39 3
      28 FRP sensor F6 1
      Engine oil pressure sensor F32 3

      Is inspection result normal? 

      YES: Perform the trouble diagnosis for power supply circuit. Refer to "DIAGNOSIS PROCEDURE ".

      NO: Repair or replace error-detected parts.

  4. CHECK PSP SENSOR GROUND CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check the continuity between PSP sensor harness connector and ECM harness connector.
      + - Continuity
      PSP sensor ECM
      Connector Terminal Connector Terminal
      F35 1 F110 45 Existed

      Is inspection result normal? 

      YES: GO TO 5.

      NO: Repair or replace error-detected parts.

  5. CHECK ECM GROUND CIRCUIT 

    Check the continuity between ECM harness connector and ground.

    ECM Ground Continuity
    Connector Terminal
    F110 10 Ground Existed
    M160 114
    115
    174
    175

    Is inspection result normal? 

    YES: Check intermittent incident. Refer to "INTERMITTENT INCIDENT ".

    NO: Repair or replace error-detected parts.

  6. CHECK PSP SENSOR SIGNAL CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check the continuity between PSP sensor harness connector and ECM harness connector.
      + - Continuity
      PSP sensor ECM
      Connector Terminal Connector Terminal
      F35 2 F110 39 Existed
    4. Also check harness for short to ground and to power.

      Is inspection result normal? 

      YES: GO TO 7.

      NO: Repair or replace error-detected parts.

  7. CHECK PSP SENSOR 

    Refer to "COMPONENT INSPECTION (POWER STEERING PRESSURE SENSOR) ".

    Is inspection result normal? 

    YES: Check intermittent incident. Refer to "INTERMITTENT INCIDENT ".

    NO: Repair or replace error-detected parts.

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