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Home >> Infiniti >> 2024 >> QX55 Essential >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System (DTC/Circuit Diagnosis) (2 Of 4) >> DTC/Circuit Diagnosis >> P0234 TC System >> Component Function Check
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Component Function Check

  1. INSPECTION START 

    Do you have CONSULT '

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    GO TO 2.

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    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?

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    INSPECTION END

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    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?

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    INSPECTION END

    >>

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