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Home › Infiniti › 2012 › FX35 AWD › Repair and Diagnosis › Engine Performance › System › Engine Control System - DTCS U0101 Through P0128 › DTC P0014, P0024: EVT Control › Diagnosis Procedure

Diagnosis Procedure

  1. CHECK FUNCTION OF EXHAUST VALVE TIMING (EVT) CONTROL

    With CONSULT 

    1. Turn ignition switch ON.
    2. Select "EXH V/T ASSIGN ANGLE" in "ACTIVE TEST" mode with CONSULT.
    3. Start engine and keep the engine speed at 2, 500 rpm, then touch "START".
    4. Check that the values of "EXH/V TIM B1" and "EXH/V TIM B2" change when touching "UP" or "DOWN".

    Without CONSULT 

    1. Start engine and rev engine up above 1, 500 rpm.
    2. Read the voltage signal between ECM harness connector terminals as follows with an oscilloscope:
      ECM Voltage signal
      + -
      Connector Terminal Connector Terminal
      F101 6 [EVT control magnet retarder (bank 1) signal] M107 128
      G05207687Courtesy of NISSAN NORTH AMERICA, INC.
      7 [EVT control magnet retarder (bank 2) signal]

      Is the inspection result normal? 

      YES: GO TO  10.

      NO: GO TO 2.

  2. CHECK EVT CONTROL MAGNET RETARDER

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO  4.

    NO: GO TO 3.

  3. REPLACE EVT CONTROL MAGNET RETARDER
    1. Replace malfunctioning EVT control magnet retarder. Refer to "EXPLODED VIEW ".
    2. Perform "EXHAUST VALVE TIMING CONTROL LEARNING: SPECIAL REPAIR REQUIREMENT ".

      : INSPECTION END

  4. CHECK EVT CONTROL POSITION SENSOR

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 5.

    NO: Replace malfunctioning EVT control position sensor. Refer to "COMPONENT PARTS LOCATION ".

  5. CHECK CRANKSHAFT POSITION SENSOR

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 6.

    NO: Replace crankshaft position sensor. Refer to "EXPLODED VIEW ".

  6. CHECK CAMSHAFT POSITION SENSOR

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 7.

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

  7. 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 8.

      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.
  8. CHECK TIMING CHAIN INSTALLATION

    Check service records for any recent repairs that may cause timing chain misaligned.

    Are there any service records that may cause timing chain misaligned? 

    YES: Check timing chain installation. Refer to "REMOVAL AND INSTALLATION ".

    NO: GO TO 9.

  9. REPLACE EVT CONTROL PULLEY ASSEMBLY
    1. Replace exhaust valve timing control pulley assembly and EVT control magnet retarder.

      Refer to "REMOVAL AND INSTALLATION " and "REMOVAL AND INSTALLATION ".

    2. Perform "EXHAUST VALVE TIMING CONTROL LEARNING: SPECIAL REPAIR REQUIREMENT ".

      : INSPECTION END

  10. CHECK INTERMITTENT INCIDENT

    Perform "INTERMITTENT INCIDENT ".

    : INSPECTION END

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