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Home >> Nissan-Datsun >> 2009 >> Maxima S >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P0451 To P1217 >> P1078, P1084 EVT Control Position Sensor >> Diagnosis Procedure

Diagnosis Procedure

  1. CHECK GROUND CONNECTION
    1. Turn ignition switch OFF.
    2. Check ground connection E9. 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.
    VOLTAGE SPECIFICATION

    DTC EVT control position sensor Ground Voltage (V)
    Bank Connector Terminal
    P1078 1 F43 1 Ground Approx. 5
    P1084 2 F42 1
    Fig 1: Checking Voltage Between EVT Control Position Sensor Harness Connector And Ground
    G05869903Courtesy of NISSAN MOTOR CO., U.S.A.

    Is the inspection result normal? 

    YES: GO TO 3.

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

  3. 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.
      CONTINUITY CHART

      DTC EVT control position sensor ECM Continuity
      Bank Connector Terminal Connector Terminal
      P1078 1 F43 2 F13 64 Existed
      P1084 2 F42 2 68
    4. Also check harness for short to ground and short to power.

    Is the inspection result normal? 

    YES: GO TO 4.

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

  4. 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.
      CONTINUITY CHART

      DTC EVT control position sensor ECM Continuity
      Bank Connector Terminal Connector Terminal
      P1078 1 F43 3 F13 66 Existed
      P1084 2 F42 3 71
    2. Also check harness for short to ground and short to power.

    Is the inspection result normal? 

    YES: GO TO 5.

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

  5. CHECK EVT CONTROL POSITION SENSOR

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 6.

    NO: Replace malfunctioning EVT control position sensor.

  6. 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 7.

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

    Fig 2: Identifying Signal Plate Of Camshaft Rear End
    G05869904Courtesy of NISSAN MOTOR CO., U.S.A.
  7. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    : INSPECTION END

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