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Home >> Infiniti >> 2013 >> FX50 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P0460 Through P1211 >> DTC P1078, P1084: EVT Control Position Sensor >> Diagnosis Procedure
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Diagnosis Procedure

  1. CHECK GROUND CONNECTION 
    1. Turn ignition switch OFF.
    2. Check ground connection M95. Refer to Ground Inspection in "CIRCUIT INSPECTION ".

      Is the inspection result normal? 

      YES: GO TO 2.

      NO: Repair or replace ground connection.

  2. CHECK EXHAUST VALVE TIMING CONTROL POSITION SENSOR POWER SUPPLY CIRCUIT-I 
    1. Disconnect exhaust valve timing (EVT) control position sensor harness connector.
    2. Turn ignition switch ON.
    3. Check the voltage between exhaust valve timing control position sensor harness connector and ground.
      DTC EVT control position sensor Ground Voltage (V)
      Bank Connector Terminal
      P1078 1 F59 1 Ground Approx. 5
      P1084 2 F63 1

      Is the inspection result normal? 

      YES: GO TO  8.

      NO-1: P1078: GO TO 3.

      NO-2: P1084: Repair open circuit, short to ground or short to power in harness or connectors.

  3. CHECK EVT CONTROL POSITION SENSOR POWER SUPPLY CIRCUIT-II 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check the continuity between EVT control position sensor harness connector and ECM harness connector.
      EVT control position sensor ECM Continuity
      Bank Connector Terminal Connector Terminal
      1 F59 1 F111 91 Existed

      Is the inspection result normal? 

      YES: GO TO 4.

      NO: Repair open circuit.

  4. CHECK SENSOR POWER SUPPLY CIRCUIT 

    Check harness for short to power and short to ground, between the following terminals.

    ECM Sensor
    Connector Terminal Name Connector Terminal
    F111 87 Crankshaft position sensor F2 1
    91 Camshaft position sensor (bank 1) F84 1
    EVT control position sensor (bank 1) F59 1
    95 Battery current sensor E21 1
    EVAP control system pressure sensor(1) B252 3
    Manifold absolute pressure sensor F65 1
    M160 99 APP sensor 2 (Wthout ICC) E112 6
    APP sensor 2 (with ICC) E116 3
    (1) Except for Mexico

    Is the inspection result normal? 

    YES: GO TO 5.

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

  5. CHECK COMPONENTS 

    Check the following.

  6. CHECK APP SENSOR 

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO  14.

    NO: GO TO 7.

  7. REPLACE ACCELERATOR PEDAL ASSEMBLY 
    1. Replace accelerator pedal assembly.
    2. Go to "SPECIAL REPAIR REQUIREMENT ".

      : INSPECTION END

  8. CHECK EVT CONTROL POSITION SENSOR GROUND CIRCUIT FOR OPEN AND SHORT 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check the continuity between EVT control position sensor harness connector and ECM harness connector.
      DTC EVT control position sensor ECM Continuity
      Bank Connector Terminal Connector Terminal
      P1078 1 F59 2 F111 58 Existed
      P1084 2 F63 2 62
    4. Also check harness for short to ground and short to power.

      Is the inspection result normal? 

      YES: GO TO 9.

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

  9. CHECK EVT CONTROL POSITION SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
    1. Check the continuity between EVT control position sensor harness connector and ECM harness connector.
      DTC EVT control position sensor ECM Continuity
      Bank Connector Terminal Connector Terminal
      P1078 1 F59 3 F111 60 Existed
      P1084 2 F63 3 64
    2. Also check harness for short to ground and short to power.

      Is the inspection result normal? 

      YES: GO TO 10.

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

  10. CHECK EXHAUST VALVE TIMING CONTROL POSITION SENSOR 

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 11.

    NO: Replace malfunctioning exhaust valve timing control position sensor. Refer to "EXPLODED VIEW ".

  11. CHECK CRANKSHAFT POSITION SENSOR 

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 12.

    NO: Replace crankshaft position sensor. Refer to "EXPLODED VIEW ".

  12. CHECK CAMSHAFT POSITION SENSOR 

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 13.

    NO: Replace malfunctioning camshaft position sensor. Refer to "EXPLODED VIEW ".

  13. CHECK CAMSHAFT (EXH) 

    Check the following.

    • Accumulation of debris to the signal plate of camshaft front end
    • Chipping signal plate of camshaft front end

      Is the inspection result normal? 

      YES: GO TO 14.

      NO: Remove debris and clean the signal plate of camshaft front end or replace camshaft. Refer to "EXPLODED VIEW ".

      Fig 1: Inspecting Exhaust Camshaft Signal Plate
      G09001494Courtesy of NISSAN NORTH AMERICA, INC.
  14. CHECK INTERMITTENT INCIDENT 

    Refer to "INTERMITTENT INCIDENT ".

    : INSPECTION END

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