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Home >> Infiniti >> 2012 >> M35h >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P0500 To P31A5 >> DTC P0520: EOP Sensor >> Diagnosis Procedure
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Diagnosis Procedure

  1. CHECK ENGINE OIL
    1. Turn ignition switch OFF.
    2. Check engine oil level and pressure. Refer to "INSPECTION ".

      Is inspection result normal? 

      YES: GO TO 2.

      NO: Repair or replace error-detected parts.

  2. CHECK EOP SENSOR POWER SUPPLY-I
    1. Disconnect EOP sensor connector.
    2. Turn ignition switch ON.
    3. Check the voltage between EOP sensor harness connector terminals.
      EOP sensor Voltage
      (Approx.)
      Connector + -
      terminal
      F51 3 2 5 V

      Inspection result normal? 

      YES: GO TO  6.

      NO: GO TO 3.

  3. CHECK EOP SENSOR POWER SUPPLY-II

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

    + - Voltage (Approx.)
    EOP sensor
    Connector Terminal
    F51 3 Ground 5 V

    Is inspection result normal? 

    YES: GO TO 4.

    NO: Perform the trouble diagnosis for power supply circuit. Refer to "DIAGNOSIS PROCEDURE ".

  4. CHECK EOP SENSOR GROUND CIRCUIT
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check the continuity between EOP sensor harness connector and ECM harness connector.
      + - Continuity
      EOP sensor ECM
      Connector Terminal Connector Terminal
      F51 2 F102 96 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
    F101 8 Ground Existed
    M107 123
    124
    127
    128

    Is inspection result normal? 

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

    NO: Repair or replace error-detected parts.

  6. CHECK EOP SENSOR SIGNAL CIRCUIT
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check the continuity between EOP sensor harness connector and ECM harness connector.
      + - Continuity
      EOP sensor ECM
      Connector Terminal Connector Terminal
      F51 1 F102 70 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 EOP SENSOR

    Refer to "COMPONENT INSPECTION (EOP SENSOR) ".

    Is inspection result normal? 

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

    NO: Repair or replace error-detected parts.

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