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Home >> Infiniti >> 2010 >> M35 Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P0441 To P1212 >> 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 connections M16, M70. Refer to "GROUND INSPECTION ".

      Is the inspection result normal? 

      YES: GO TO 2.

      NO: Repair or replace ground connections.

  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.
      CONNECTOR TERMINAL VOLTAGE CHART

      DTC EVT control position sensor Ground Voltage (V)
      Bank Connector Terminal
      P1078 1 F82 1 Ground Approx. 5
      P1084 2 F83 1
      Fig 1: Checking Voltage Between CKP Sensor Terminal 1 And Ground
      G04875182Courtesy of NISSAN MOTOR CO., U.S.A.

      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.
      CONNECTOR TERMINAL CONTINUITY CHART

      EVT control position sensor ECM Continuity
      Bank Connector Terminal Connector Terminal
      2 F83 1 F106 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 SPECIFICATIONS

    ECM Sensor
    Connector Terminal Name Connector Terminal
    F105 46 Crankshaft position (CKP) sensor F52 1
    F106 64 Camshaft position (CMP) sensor (bank 2) F32 1
    EVT control position sensor (bank 2) F83 1
    Battery current sensor E67 1
    M9 103 Accelerator pedal position (APP) sensor E113 5
    107 EVAP control system pressure sensor B172 3
    111 Refrigerant pressure sensor E66 1

    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.
      CONNECTOR TERMINAL CONTINUITY CHART

      DTC EVT control position sensor ECM Continuity
      Bank Connector Terminal Connector Terminal
      P1078 1 F82 2 F106 88 Existed
      P1084 2 F83 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.
      CONNECTOR TERMINAL CONTINUITY CHART

      DTC EVT control position sensor ECM Continuity
      Bank Connector Terminal Connector Terminal
      P1078 1 F82 3 F106 58 Existed
      P1084 2 F83 3 62
    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 EVT CONTROL POSITION SENSOR

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 11.

    NO: Replace malfunctioning EVT control position sensor.

  11. CHECK CKP SENSOR

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 12.

    NO: Replace CKP sensor.

  12. CHECK CMP SENSOR

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 13.

    NO: Replace malfunctioning CMP sensor.

  13. 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 14.

      NO: Remove debris and clean the signal plate of camshaft rear end or replace camshaft.

      Fig 2: Checking Camshaft (EXH)
      G05207688Courtesy of NISSAN MOTOR CO., U.S.A.
  14. CHECK INTERMITTENT INCIDENT

    Refer to "DESCRIPTION ".

    INSPECTION END

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