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Home >> Infiniti >> 2012 >> FX35 AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P0441 Through P1168 >> 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 (EVT) CONTROL POSITION SENSOR POWER SUPPLY CIRCUIT-I
    1. Disconnect EVT control position sensor harness connector.
    2. Turn ignition switch ON.
    3. Check the voltage between EVT control position sensor harness connector and ground.
      DTC EVT control position sensor Ground Voltage (V)
      Bank Connector Terminal
      P1078 1 F4 1 Ground Approx. 5
      P1084 2 F19 1

      Is the inspection result normal? 

      YES: GO TO  8.

      NO-1: P1078: Repair open circuit, short to ground or short to power in harness or connectors.

      NO-2: P1084: GO TO 3.

  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
      2 F19 1 F102 64 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
    F101 46 Crankshaft position (CKP) sensor F2 1
    F102 64 Camshaft position (CMP) sensor (bank 2) F18 1
    EVT control position sensor (bank 2) F19 1
    Battery current sensor E21 1
    M107 103 Accelerator pedal position (APP) sensor E112 (Without ICC) 6
    E116 (With ICC) 3
    107 EVAP control system pressure sensor B252 3
    111 Refrigerant pressure sensor E77 3

    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  15.

    NO: GO TO 7.

  7. REPLACE ACCELERATOR PEDAL ASSEMBLY

    Replace accelerator pedal assembly. Refer to "MODELS WITHOUT DISTANCE CONTROL ASSIST SYSTEM: REMOVAL AND INSTALLATION " (without distance control assist) or "MODELS WITH DISTANCE CONTROL ASSIST SYSTEM: REMOVAL AND INSTALLATION " (without distance control assist).

    : 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 F4 2 F102 88 Existed
      P1084 2 F19 2
    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 exhaust valve timing control position sensor harness connector and ECM harness connector.
      DTC EVT control position sensor ECM Continuity
      Bank Connector Terminal Connector Terminal
      P1078 1 F4 3 F102 58 Existed
      P1084 2 F19 3 62
    2. Also check harness for short to ground and short to power.

      Is the inspection result normal? 

      YES: GO TO  11.

      NO: GO TO 10.

  10. DETECT MALFUNCTIONING PART

    Check the Following:

    Harness for open or short between EVT control position sensor and ECM

    : Repair open circuit, short to ground or short to power in harness or connectors.

  11. CHECK EVT CONTROL POSITION SENSOR

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 12.

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

  12. CHECK CKP SENSOR

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 13.

    NO: Replace CKP sensor. Refer to "EXPLODED VIEW ".

  13. CHECK CMP SENSOR

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 14.

    NO: Replace malfunctioning CMP sensor. Refer to "EXPLODED VIEW ".

  14. CHECK CAMSHAFT (EXH)

    Check the Following:

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

      Is the inspection result normal? 

      YES: GO TO 15.

      NO: Remove debris and clean the signal plate of camshaft rear end or replace camshaft. Refer to "REMOVAL AND INSTALLATION ".

      Fig 1: Inspecting Signal Plate Of Camshaft Rear End For Debris
      G05207688Courtesy of NISSAN NORTH AMERICA, INC.
  15. CHECK INTERMITTENT INCIDENT

    Perform "INTERMITTENT INCIDENT ".

    : INSPECTION END

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