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Home >> Infiniti >> 2008 >> G35 Base >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System - DTCS P0850 Through P2A03 >> 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 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.
      TERMINALS VOLTAGE REFERENCE

      DTC EVT control position sensor Ground Voltage
      Bank Connector Terminal
      P1078 1 F4 1 Ground Approx. 5V
      P1084 2 F19 1

    Is the inspection result normal? 

    YES: GO TO  8.

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

    NO-2: P1084: GO TO 3.

  3. CHECK EXHAUST VALVE TIMING CONTROL POSITION SENSOR POWER SUPPLY CIRCUIT-II
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check the continuity between exhaust valve timing control position sensor harness connector and ECM harness connector.
      TERMINALS CONTINUITY REFERENCE

      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 CRANKSHAFT POSITION (CKP) SENSOR (POS) POWER SUPPLY CIRCUIT-III

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

    CONNECTOR TERMINALS REFERENCE

    ECM Sensor
    Connector Terminal Name Connector Terminal
    F101 46 CKP sensor (POS) F2 1
    F102 64 CMP sensor (PHASE) (bank 2) F18 1
    EVT control position sensor (bank 2) F19 1
    Battery current sensor E21 1
    M107 103 APP sensor E112 6
    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.

    Is the inspection result normal? 

    YES: GO TO 6.

    NO: Replace malfunctioning component.

  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
    1. Replace accelerator pedal assembly.
    2. Go to "SPECIAL REPAIR REQUIREMENT ".

      INSPECTION END

  8. CHECK EXHAUST VALVE TIMING CONTROL POSITION SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check the continuity between exhaust valve timing control position sensor harness connector and ECM harness connector.
      TERMINALS CONTINUITY REFERENCE

      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 or short to ground or short to power in harness or connectors.

  9. CHECK EXHAUST VALVE TIMING 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.
      TERMINALS CONTINUITY REFERENCE

      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 connectors F107, F106
    • Harness for open or short between exhaust valve timing control position sensor and ECM

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

  11. CHECK EXHAUST VALVE TIMING CONTROL POSITION SENSOR

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 12.

    NO: Replace malfunctioning exhaust valve timing control position sensor.

  12. CHECK CRANKSHAFT POSITION SENSOR (POS)

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 13.

    NO: Replace crankshaft position sensor (POS).

  13. CHECK CAMSHAFT POSITION SENSOR (PHASE)

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 14.

    NO: Replace malfunctioning camshaft position sensor (PHASE).

  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.

    Fig 1: Checking Camshaft For Chipping
    G05207688Courtesy of NISSAN MOTOR CO., U.S.A.
  15. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    INSPECTION END

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