ECD SYSTEM, Diagnostic DTC:P0234

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

DESCRIPTION

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P0234 Turbocharger / Supercharger "A" Overboost Condition

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

 Comes on DTC stored
Related Data List
DTC No. Data List
P0234

  • Target Booster Pressure

  • MAP

CAUTION / NOTICE / HINT

Note

When replacing the ECM, the ECM needs registration and initialization.

Click here

Tech Tips


  • 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.

PROCEDURE


  1. CHECK INTAKE SYSTEM


    1. Start the engine.

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

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

      Tech Tips


      • Oily patches are signs of leaks.

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

      OK
      No leakage.
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE INTAKE SYSTEM Click here

    OK

  2. 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.


      Powertrain > Engine and ECT > Active Test
      Tester Display
      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.

      Tech Tips

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

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE TURBOCHARGER SUB-ASSEMBLY Click here

    OK

  3. 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.


      Powertrain > Engine and ECT > Clear DTCs

    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.


      Powertrain > Engine and ECT > Trouble Codes

    8. Read the DTCs.

      Result
      Result Proceed to
      No DTC output A
      DTC P0234 B

    A

    END

    B

    GO TO STEP 6 Click here

  4. REPLACE TURBOCHARGER SUB-ASSEMBLY


    1. Replace the turbocharger sub-assembly.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  5. 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.


      Powertrain > Engine and ECT > Clear DTCs

    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.


      Powertrain > Engine and ECT > Trouble Codes

    8. Read the DTCs.

      Result
      Result Proceed to
      No DTC output A
      DTC P0234 B

    A

    END

    B

  6. REPLACE ECM


    1. Replace the ECM.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 8 Click here

  7. REPAIR OR REPLACE INTAKE SYSTEM


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

      Result
      Proceed to
      NEXT

    NEXT

  8. 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.


      Powertrain > Engine and ECT > Clear DTCs

    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.


      Powertrain > Engine and ECT > Trouble Codes

    8. Confirm that the DTC is not output again.

      Result
      Proceed to
      NEXT

    NEXT

    END