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ECD SYSTEM (for Swirl Control Valve), Diagnostic DTC:P0234

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DTC Code DTC Name
P0234 Turbocharger / Supercharger "A" Overboost Condition
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DESCRIPTION

DTC No. DTC Detection Condition Trouble Area
P0234

Actual turbocharger pressure is at higher than target pressure threshold for 5 seconds.

(3 trip detection logic)

  • Intake system air leak

  • Turbocharger sub-assembly

  • ECM
Table 1. Related Data List
DTC No. Data List
P0234

  • Target Booster Pressure

  • MAP
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INSPECTION PROCEDURE

Note:

When replacing the ECM, the ECM needs Registration and Initialization (Click here).

Tip:

  • When the ECM must be replaced, before replacing the ECM, perform the "Learning Values Save" function using the GTS. Then after installing the new ECM, perform all of the initialization/registrations for the "Learning Values Write" function by following the instructions shown on the GTS display.

  • Read freeze frame data using the GTS. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, and other data from the time the malfunction occurred.

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PROCEDURE


  1. Click here

    CHECK INTAKE SYSTEM


    1. Start the engine.

    2. Check air duct between intake silencer, mass air flow meter and turbocharger for leaks.

    3. Check air duct between turbocharger and intake manifold for leaks.

      Tip:

      • Oily patches are signs of leaks.

      • Check whether sealing rings on charge air hoses are rolled back or missing.

      OK
      No leakage.

  2. Click here

    PERFORM ACTIVE TEST USING GTS (ACTUATOR TEST OF TURBO CHARGER)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON and turn the GTS on.

    3. Start the engine.

    4. Enter the following menus: Powertrain / Engine and ECT / Active Test / Actuator Test of Turbo Charger.

    5. Set the control value to 5%. The variable nozzle vane turbocharger must operate within 1 second. Valve travel when adjusted is approximately 15 mm.

    6. Wait for 2 seconds and set the control value to 95%. The variable nozzle vane turbocharger must operate within 1 second. Valve travel when adjusted is approximately 15 mm.

    7. Wait for 2 seconds and stop the operation using the variable nozzle vane turbocharger Active Test.

      OK
      Operates smoothly when above procedure is performed.
      Tip:

      Check the movement of the variable turbine (stiffness, interference with other parts, etc.).


  3. Click here

    CHECK WHETHER DTC OUTPUT RECURS (DTC P0234)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON and turn the GTS on.

    3. Clear the DTCs (Click here).

    4. Turn the ignition switch off and wait for 60 seconds or more [A].

    5. Perform road test [B].

    6. Repeat [A] and [B] for the number of trips detected.

    7. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

    8. Read the DTCs.

      Table 2. Result
      Result Proceed to
      No DTC output A
      DTC P0234 B

  4. Click here

    REPAIR OR REPLACE INTAKE SYSTEM


    1. Repair or replace the malfunctioning parts of the intake system.


  5. Click here

    REPLACE TURBOCHARGER SUB-ASSEMBLY


    1. Replace the turbocharger sub-assembly (Click here).


  6. Click here

    CHECK WHETHER DTC OUTPUT RECURS (DTC P0234)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON and turn the GTS on.

    3. Clear the DTCs (Click here).

    4. Turn the ignition switch off and wait for 60 seconds or more [A].

    5. Perform road test [B].

    6. Repeat [A] and [B] for the number of trips detected.

    7. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

    8. Read the DTCs.

      Table 3. Result
      Result Proceed to
      No DTC output A
      DTC P0234 B

  7. Click here

    REPLACE ECM


    1. Replace the ECM (Click here).


  8. Click here

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON and turn the GTS on.

    3. Clear the DTCs (Click here).

    4. Turn the ignition switch off and wait for 60 seconds or more [A].

    5. Perform road test [B].

    6. Repeat [A] and [B] for the number of trips detected.

    7. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

    8. Confirm that the DTC is not output again.


  9. Click here

    END