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Home >> Infiniti >> 2023 >> QX55 Essential >> Repair and Diagnosis (Single Page) >> Engine Performance >> Testing & Diagnosis >> Engine Control System (DTC/Circuit Diagnosis) (2 Of 5) >> DTC/Circuit Diagnosis >> DTC P0234: TC System >> Component Function Check
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Component Function Check

  1. INSPECTION START 

    Do you have CONSULT?

    YES

    GO TO 2.

    NO

    GO TO 3.

  2. CHECK ELECTRIC WASTEGATE CONTROL ACTUATOR 

    SYMBOL With CONSULT

    1. Turn ignition switch ON and engine stopped.
    2. On the CONSULT screen, select "ENGINE">>"ACTIVE TEST">>"WASTEGATE ACTUATOR".
    3. Operate "Up" or "Down", set "W/G ACTUATOR POSITION B1" to 0.002 m, and make a quick short note of value "V1" of "W/G ACTUATOR POSI SEN B1".
    4. Operate "Up" or "Down", set "W/G ACTUATOR POSITION B1" to 0.015 m, and make a quick short note of value "V2" of "W/G ACTUATOR POSI SEN B1".

    Do the values of "V1" and "V2" change (visually, ACTUATOR SHAFT operates) and "V2" minus "V1" becomes equal to or more than 2.6V?

    YES

    INSPECTION END

    NO

    Replace Turbocharger Assembly (do not replace electric wastegate control actuator only). Refer to Component Location .

  3. CHECK ELECTRIC WASTEGATE CONTROL ACTUATOR 

    SYMBOL Without CONSULT

    1. Turn ignition switch OFF.
    2. Disconnect Wastegate control actuator harness connector.
    3. While checking the POSITION SENSOR OUT voltage with an oscilloscope, apply a voltage of 12 V to the positive or negative terminal.

    Does ACTUATOR SHAFT visually operate and POSITION SENSOR OUT voltage change?

    YES

    INSPECTION END

    NO

    Replace Turbocharger Assembly (do not replace electric wastegate control actuator only). Refer to Component Location .