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Home >> Infiniti >> 2008 >> G35 Base >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System - DTCS U1000 Through P0153 >> DTC P0078, P0084: EVT Control Magnet Retarder >> Diagnosis Procedure

Diagnosis Procedure

  1. CHECK EXHAUST VALVE TIMING CONTROL MAGNET RETARDER POWER SUPPLY CIRCUIT
    1. Turn ignition switch OFF.
    2. Disconnect exhaust valve timing control magnet retarder harness connector.
    3. Turn ignition switch ON.
    4. Check the voltage between exhaust valve timing control magnet retarder harness connector and ground.
      DTC CHART

      DTC EVT control magnet retarder Ground Voltage
      Bank Connector Terminal
      P0078 1 F32 1 Ground Battery voltage
      P0084 2 F41 1

    Is the inspection result normal? 

    YES: GO TO  3.

    NO: GO TO 2.

  2. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors E3, F1
    • Harness for open or short between exhaust valve timing control magnet retarder and IPDM E/R

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

  3. CHECK EXHAUST VALVE TIMING CONTROL MAGNET RETARDER OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check the continuity between exhaust valve timing control magnet retarder harness connector and ECM harness connector.
      DTC CHART

      DTC EVT control magnet retarder ECM Continuity
      Bank Connector Terminal Connector Terminal
      P0078 1 F32 2 F101 6 Existed
      P0084 2 F41 2 7
    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 or short to ground or short to power in harness or connectors.

  4. CHECK EXHAUST VALVE TIMING CONTROL MAGNET RETARDER

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO  6.

    NO: GO TO 5.

  5. REPLACE EXHAUST VALVE TIMING CONTROL MAGNET RETARDER
    1. Replace malfunctioning exhaust valve timing control magnet retarder.
    2. Perform "EXHAUST VALVE TIMING CONTROL LEARNING : SPECIAL REPAIR REQUIREMENT ".

    INSPECTION END

  6. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    INSPECTION END

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