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Home >> Infiniti >> 2015 >> QX60 Base, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 40 (Engine Control System (DTC/Circuit Diagnosis) (VQ35DE) (Except Hybrid) (1 Of 3)) >> DTC/Circuit Diagnosis >> DTC P0078, P0084: EVT Control Solenoid Valve >> Diagnosis Procedure >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2016 Infiniti QX60. However, it is still accessible from the selected car via links, so may be relevant.

  1. CHECK EXHAUST VALVE TIMING CONTROL SOLENOID VALVE POWER SUPPLY CIRCUIT - 1

    1. Turn ignition switch OFF.
    2. Disconnect exhaust valve timing control solenoid valve harness connector.
    3. Turn ignition switch ON.
    4. Check the voltage between exhaust valve timing control solenoid valve harness connector and ground.
      DTC + - Voltage
      Exhaust valve timing control solenoid valve
      Bank Connector Terminal
      P0078 1 F86 1 Ground Battery voltage
      P0084 2 F85 1

    Is the inspection result normal?

    YES 

    GO TO STEP 2  .

    NO 

    GO TO STEP 4  .

  2. CHECK EVT CONTROL SOLENOID VALVE 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 solenoid valve harness connector and ECM harness connector.
      DTC + - Continuity
      Exhaust valve timing control solenoid valve ECM
      Bank Connector Terminal Connector Terminal
      P0078 1 F86 2 F79 58 Existed
      P0084 2 F85 2 60
    4. Also check harness for short to ground and short to power.

    Is the inspection result normal?

    YES 

    GO TO STEP 3  .

    NO 

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

  3. CHECK EXHAUST VALVE TIMING CONTROL SOLENOID VALVE

    Check exhaust valve timing control solenoid valve. Refer to COMPONENT INSPECTION .

    Is the inspection result normal?

    YES 

    INSPECTION END

    NO 

    Replace malfunctioning exhaust valve timing control solenoid valve. Refer to EXPLODED VIEW .

  4. CHECK EXHAUST VALVE TIMING CONTROL SOLENOID VALVE POWER SUPPLY CIRCUIT - 2

    1. Turn ignition switch OFF.
    2. Disconnect IPDM E/R harness connector.
    3. Check the continuity between IPDM E/R harness connector and exhaust valve timing control solenoid valve harness connector.
      DTC + - Continuity
      IPDM E/R Exhaust valve timing control solenoid valve
      Connector Terminal Connector Terminal
      P0075 F19 59 F72 1 Existed
      P0081 F73 Existed
    4. Also check harness for short to ground.

    Is the inspection result normal?

    YES 

    Perform the trouble diagnosis for power supply circuit.

    NO 

    Repair or replace error-detected parts.

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