ECD SYSTEM, Diagnostic DTC:P00BC

DTC Code DTC Name
P00BC Mass or Volume Air Flow "A" Circuit Range/Performance - Air Flow Too Low

DESCRIPTION

Tech Tips

For more information on the EGR control, refer to System Description Click here.

DTC No. DTC Detection Condition Trouble Area
P00BC

Either condition is met (3 trip detection logic):


  • Difference exists between estimated MAF and actual MAF for 5 seconds.

  • When boost pressure control errors are detected on both high pressure and low pressure sides for 5 seconds.

  • Intake system air leak

  • EGR valve assembly

  • EGR cooler assembly

  • Turbo pressure sensor assembly

  • ECM
Related Data List
DTC No. Data List
P00BC

  • Target EGR Position

  • Actual EGR Valve Pos

CAUTION / NOTICE / HINT

Note


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

  • After replacing the EGR valve assembly, the ECM needs initialization Click here.

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

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. Check for air leaks in the intake system from the mass air flow meter to the turbocharger sub-assembly.


    NG

    REPAIR OR REPLACE INTAKE SYSTEM Click here

    OK

  2. PERFORM ACTIVE TEST USING GTS (ACTUATOR TEST OF EGR-VALVE)


    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 EGR-Valve / Data List / Target EGR Position and Actual EGR Valve Pos.

    5. Perform the following steps 1 to 4.

    6. Step 1


      1. Perform Actuator Test of EGR-Valve with control value of 0% (opening ratio in %).

      2. Monitor the difference of the control value and EGR valve Actuator Position value (0 +/- 3%). EGR valve must operate within 1 second.

    7. Step 2


      1. Wait for 2 seconds or more.

    8. Step 3


      1. Perform Actuator Test of EGR-Valve with control value of 94% (opening ratio in %).

      2. Monitor the difference of the control value and EGR valve Actuator Position value (0 +/- 3%). EGR valve must operate within 1 second.

    9. Step 4


      1. Wait for 2 seconds or more.

    10. Perform the above steps 1 to 4 and check that the part operates as specified.

      OK
      Part operates as specified.

      Tech Tips


      • Make sure that the EGR valve is not stuck open due to carbon jamming or an operation malfunction.

      • If DTCs P00BC, P042F or P1268 is output, there may be a malfunction in the EGR system.


    NG

    REPLACE EGR VALVE ASSEMBLY Click here

    OK

  3. CHECK EGR COOLER ASSEMBLY


    1. Check that the airflow is not slowed by soot deposits in the EGR cooler.

      OK
      Airflow is not slowed by soot deposits.

    NG

    CLEAN EGR COOLER ASSEMBLY Click here

    OK

  4. CHECK TURBO PRESSURE SENSOR ASSEMBLY


    1. Check for DTCs related to the turbo pressure sensor assembly.


    NG

    REPAIR OR REPLACE TURBO PRESSURE SENSOR ASSEMBLY Click here

    OK

  5. CHECK WHETHER DTC OUTPUT RECURS (DTC P00BC)


    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.

      Result
      Result Proceed to
      No DTC output A
      DTC P00BC B

    A

    END

    B

    REPLACE ECM Click here

  6. REPLACE EGR VALVE ASSEMBLY


    1. Replace the EGR valve assembly Click here.

    2. Perform EGR learning value reset Click here.


    NEXT

  7. CHECK WHETHER DTC OUTPUT RECURS (DTC P00BC)


    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.

      Result
      Result Proceed to
      No DTC output A
      DTC P00BC B

    A

    END

    B

    REPLACE ECM Click here

  8. REPAIR OR REPLACE INTAKE SYSTEM


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


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  9. CLEAN EGR COOLER ASSEMBLY


    1. Clean the EGR cooler assembly.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  10. REPAIR OR REPLACE TURBO PRESSURE SENSOR ASSEMBLY


    1. Repair or replace turbo pressure sensor assembly or perform inspections and troubleshooting for related DTCs Click here.

      Tech Tips

      When the turbo pressure sensor assembly is replaced, perform initialization.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  11. REPLACE ECM


    1. Replace the ECM Click here.


    NEXT

  12. 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.


    NEXT

    END