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Home >> Infiniti >> 2012 >> M35h >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P0500 To P31A5 >> 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  5.

      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 2 CIRCUIT

    Check sensor power supply 2 circuit. Refer to "DIAGNOSIS PROCEDURE ".

    Is the inspection result normal? 

    YES: GO TO  12.

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

  5. 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 96 Existed
      P1084 2 F19 2 92
    4. Also check harness for short to ground and short to power.

      Is the inspection result normal? 

      YES: GO TO 6.

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

  6. 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  8.

      NO: GO TO 7.

  7. 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.

  8. CHECK EVT CONTROL POSITION SENSOR

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 9.

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

  9. CHECK CKP SENSOR

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 10.

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

  10. CHECK CMP SENSOR

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 11.

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

  11. 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 12.

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

      Fig 1: Checking The Signal Plate Of Camshaft For Chipping Or Debris
      G08255735Courtesy of NISSAN NORTH AMERICA, INC.
  12. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    : INSPECTION END

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