ECD SYSTEM, Diagnostic DTC:P0234, P0299, P1251

DTC Code DTC Name
P0234 Turbocharger / Supercharger Overboost Condition
P0299 Turbocharger / Supercharger Underboost
P1251 Turbocharger / Supercharger Overboost Condition (Too High)

DESCRIPTION

P0234
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
After warming up the engine, the vehicle is driven at a constant vehicle speed at an engine speed of 2400 rpm or more for 2 minutes

Actual turbocharger pressure "MAP" deviates by 30 kPa (225 mmHg, 8.9 in.Hg) or higher from the simulated target pressure "Target Booster Pressure" for 100 seconds at an engine speed of 2400 to 4000 rpm.

(1 trip detection logic)


  • E-VRV for turbocharger control

  • Open or short in E-VRV circuit

  • Turbocharger

  • EGR valve

  • Manifold absolute pressure sensor

  • ECM

P0299
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
After warming up the engine, the vehicle is driven at a constant vehicle speed at an engine speed of 2400 rpm or more for 2 minutes

When any condition below is met (2 trip detection logic):


  • The pressure "MAP" is 70 kPa (525 mmHg, 20.7 in.Hg) below the Target Boost Pressure for 80 seconds at an engine speed of around 2400 rpm.

  • The pressure is 50 kPa (375 mmHg, 14.8 in.Hg) below the Target Boost Pressure for 80 seconds at an engine speed of around 2800 rpm.

  • The pressure is 30 kPa (225 mmHg, 8.9 in.Hg) below the Target Boost Pressure for 80 seconds at an engine speed of 3600 to 4000 rpm.


  • VRV for turbocharger control

  • Open or short in E-VRV circuit

  • Turbocharger

  • EGR valve

  • Disconnected pipe between turbo and intake manifold

  • Disconnected MAP sensor hose

  • Manifold absolute pressure sensor

  • Injection system (reduction in fuel injection volume)

  • EGR does not close

  • Throttle valve stuck closed

  • Vacuum hose

  • ECM

P1251
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
After warming up the engine, fully depress the accelerator pedal for 5 seconds or more so that the engine speed is 2400 rpm or more.

The turbocharger pressure is 300 kPa (2250 mmHg, 89 in.Hg) or more for 5 seconds or more at an engine speed of 2000 to 4000 rpm.

(1 trip detection logic)


  • E-VRV for turbocharger control

  • Open or short in E-VRV circuit

  • Turbocharger

  • EGR valve

  • Manifold absolute pressure sensor

  • ECM

Related Data List
DTC No. Data List
P0234
  • Target Booster Pressure

  • MAP

P0299
P1251

WIRING DIAGRAM

A00OV4QE03

INSPECTION PROCEDURE

Note


  • Inspect the fuses of circuits related to this system before performing the following inspection procedure.

  • After replacing the ECM, the new ECM needs registration Click here and initialization Click here.

PROCEDURE


  1. READ OUTPUT DTC (RECORD STORED DTC AND FREEZE FRAME DATA)


    1. Connect the intelligent tester to the DLC3.

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

    3. Enter the following menus: Powertrain / Engine and ECT / DTC.

    4. Record the stored DTC and Freeze Frame Data.

      Tech Tips

      Be sure to carefully examine "MAP" and "Target Booster Pressure" in the freeze frame data.


    NEXT
  2. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0234, P0299 AND/OR P1251)


    1. Connect the intelligent tester to the DLC3.

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

    3. Enter the following menus: Powertrain / Engine and ECT / DTC.

    4. Read the DTCs.

      Result
      Result Proceed to
      P0234, P0299 and/or P1251 A
      P0234, P0299 and/or P1251 and other DTCs B

    B
    A
  3. READ VALUE USING INTELLIGENT TESTER (MAP AND TARGET BOOSTER PRESSURE)


    1. A00OQZUE02

      Connect the intelligent tester to the DLC3.

    2. Start the engine and turn the tester on.

    3. Enter the following menus: Powertrain / Engine and ECT / Data List / MAP and Target Booster Pressure.

    4. Take a snapshot when the engine speed is maintained at 4500 rpm with no load.

    5. Read the values of "MAP" and "Target Booster Pressure" in the Data List using the snapshot review function.

      Result
      Result Proceed to
      Difference between MAP and Target Booster Pressure is +/-15 kPa or higher A
      Except above B

    B
    A
  4. CHECK AIR INTAKE SYSTEM


    1. Check for air leaks and blockages between the air cleaner case and turbocharger, and between turbocharger and intake manifold.

      Result
      Result Proceed to
      Leaks and/or blockages exist in the intake system A
      No leaks and/or blockages in the intake system B

      Tech Tips


      • Inspect the air intake system, especially hoses and pipes between the air cleaner and turbocharger.

      • Check for abnormal disconnections, pipe and hose squashing, and any damage in the intake system.

      • Using your hand, check whether the pipes and hoses in the intake system are securely connected.

      • By applying soapy water and revving up the engine, air leaks from the intake system can be checked by checking for bubbles.

      • Check for any modifications in the intake system made by the user.

      • Check if the vacuum hose for the manifold absolute pressure sensor is disconnected.


    B
    A
  5. REPAIR OR REPLACE AIR INTAKE SYSTEM


    NEXT
  6. READ VALUE USING INTELLIGENT TESTER (MAP AND TARGET BOOSTER PRESSURE)


    1. A00OQZUE02

      Connect the intelligent tester to the DLC3.

    2. Start the engine and turn the tester on.

    3. Enter the following menus: Powertrain / Engine and ECT / Data List / MAP and Target Booster Pressure.

    4. Take a snapshot when the engine speed is maintained at 4500 rpm with no load.

    5. Read the values of "MAP" and "Target Booster Pressure" in the Data List using the snapshot review function.

      Result
      Result Proceed to
      Difference between MAP and Target Booster Pressure is +/-15 kPa or higher A
      Except above B

    B
    A
  7. CHECK CONNECTION OF VACUUM HOSE


    1. Check the turbocharger system vacuum hose connections


    NG
    OK
  8. INSPECT E-VRV FOR TURBOCHARGER CONTROL (E-VRV RESISTANCE)


    1. Inspect the E-VRV Click here.


    NG
    OK
  9. CHECK TURBOCHARGER SUB-ASSEMBLY


    1. Check the turbocharger sub-assembly Click here.


    NG
    OK
  10. CHECK HARNESS AND CONNECTOR (E-VRV FOR TURBOCHARGER CONTROL - ECM)


    1. A00OTKIE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to E-VRV)

      *2

      Front view of wire harness connector

      (to ECM)

      Disconnect the E-VRV connector.

    2. Disconnect the ECM connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      B65-2 - B39-83 (VN) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      B65-2 or B39-83 (VN) - Body ground Always 10 kΩ or higher
    4. Reconnect the E-VRV connector.

    5. Reconnect the ECM connector.


    NG
    OK
  11. CHECK DIESEL THROTTLE BODY ASSEMBLY


    1. A00OQZUE02

      Connect the intelligent tester to the DLC3.

    2. Start the engine and turn the tester on.

    3. Enter the following menus: Powertrain / Engine and ECT / Data List / Actual Throttle Position.

    4. Take a snapshot when accelerating with the accelerator fully depressed.

    5. Read the value of "Actual Throttle Position" in the Data List using the snapshot review function.

      Result
      The value for "Actual Throttle Position" is 0%.

    NG
    OK
  12. CHECK EGR VALVE ASSEMBLY


    1. A00OQZUE02

      Connect the intelligent tester to the DLC3.

    2. Start the engine and turn the tester on.

    3. Enter the following menus: Powertrain / Engine and ECT / Data List / Actual EGR Valve Pos..

    4. Take a snapshot when accelerating with the accelerator fully depressed.

    5. Read the value of "Actual EGR Valve Pos." in the Data List using the snapshot review function.

      Result
      The value for "Actual EGR Valve Pos." is 0%.

    NG
    OK
  13. READ VALUE USING INTELLIGENT TESTER (INJECTION FEEDBACK VAL #1 TO #4)


    1. Connect the intelligent tester to the DLC3.

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

    3. Start the engine and warm it up.

    4. Enter the following menus: Powertrain / Engine and ECT / Data List / Injection Feedback Val #1 to #4.

    5. Read the values.

      Standard Value
      Item Engine Speed* Reference Value
      Injection Feedback Val #1 to #4 Idling

      -3.0 to 3.0 mm3/st

      Tech Tips


      • *: The A/C switch and all accessory switches should be off, and the engine should be fully warmed up.

      • When the values are outside the standard range, deposits inside the fuel injectors may be causing the problem.

      OK
      Values are within the standard range.

    NG
    OK
  14. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0234, P0299 AND/OR P1251)


    1. Connect the intelligent tester to the DLC3.

    2. Clear the DTCs Click here.

    3. Turn the ignition switch off for 30 seconds or more.

    4. Start the engine and warm it up for 1 minute or more.

    5. Turn the tester on.

    6. Read the value of Engine Speed from the Freeze Frame Data recorded previously.

      Tech Tips

      When performing the DTC detection drive pattern, make sure the engine speed increases to 2400 rpm or more and exceeds the "Engine Speed" value from the freeze frame data.

    7. After warming up the engine, drive the vehicle at a constant vehicle speed at an engine speed of 2400 rpm or more for 2 minutes.

    8. With the engine warmed up, fully depress the accelerator pedal for 5 seconds or more so that the engine speed is 2400 rpm or more.

    9. Enter the following menus: Powertrain / Engine and ECT / DTC / Pending.

    10. Read the DTC.

      Result
      Result Proceed to
      No output A
      P0234, P0299 and/or P1251 B

    B
    A
  15. REPLACE FUEL INJECTOR OF MALFUNCTIONING CYLINDER


    1. Replace the fuel injector Click here.


    NEXT
  16. BLEED AIR FROM FUEL SYSTEM


    1. Bleed the air from the fuel system Click here.


    NEXT
  17. REGISTER INJECTOR COMPENSATION CODE AND PERFORM PILOT QUANTITY LEARNING


    1. Register the injector compensation code Click here.

    2. Perform the fuel injector pilot quantity learning Click here.


    NEXT
  18. REPAIR OR REPLACE VACUUM HOSE


    1. Repair or replace the vacuum hose.


    NEXT
  19. REPLACE E-VRV FOR TURBOCHARGER CONTROL


    1. Replace the E-VRV Click here.


    NEXT
  20. REPLACE TURBOCHARGER SUB-ASSEMBLY


    1. Replace the turbocharger sub-assembly Click here.


    NEXT
  21. REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the harness or connector.


    NEXT
  22. REPLACE DIESEL THROTTLE BODY ASSEMBLY


    1. Replace the diesel throttle body assembly Click here.


    NEXT
  23. REPLACE EGR VALVE ASSEMBLY


    1. Replace the EGR valve assembly Click here.


    NEXT
  24. REPLACE ECM


    1. Replace the ECM Click here.


    NEXT
  25. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the intelligent tester to the DLC3.

    2. Clear the DTCs Click here.

    3. Turn the ignition switch off for 30 seconds or more.

    4. Start the engine and warm it up.

    5. Turn the tester on.

    6. Read the value of Engine Speed from the Freeze Frame Data recorded previously.

      Tech Tips

      When performing the DTC detection drive pattern, make sure the engine speed increases to 2400 rpm or more and exceeds the "Engine Speed" value from the freeze frame data.

    7. After warming up the engine, drive the vehicle at a constant vehicle speed at an engine speed of 2400 rpm or more for 2 minutes.*A

    8. With the engine warmed up, fully depress the accelerator pedal for 5 seconds or more so that the engine speed is 2400 rpm or more.*B

    9. Confirm that the DTC is not output again.

      Tech Tips

      Perform the following procedure using the tester to determine whether or not the DTC judgment has been carried out.


      1. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

      2. Input DTC P0234, P0299 and/or P1251.

      3. Check that STATUS is NORMAL.

        Tech Tips


        • If STATUS is NORMAL, DTC judgment is complete and the system is determined to be normal.

        • If STATUS is INCOMPLETE or UNKNOWN, perform *A and *B again.


    NEXT