ECD SYSTEM, Diagnostic DTC:P2BAB

DTC Code DTC Name
P2BAB NOx Exceedance - Incorrect EGR Flow

DESCRIPTION

The EGR system recirculates exhaust gases, and is controlled to the proper volume to be suitable for all driving conditions. The recirculated gas mixes with the intake air, allowing the EGR system to slow down engine combustion and lower the combustion temperature. This helps reduce NOx emissions.

In order to increase circulation efficiency, the ECM adjusts the lift amount of the EGR valve and throttle valve.

DTC No. DTC Detection Condition Trouble Area
P2BAB

After engine is warmed up, mass air flow rate is not changed when decelerating by releasing the accelerator pedal.

(2 trip detection logic)

  • EGR valve stuck

  • EGR valve does not move smoothly

  • EGR valve deposit

  • EGR valve passage deposit

  • EGR cooler assembly

  • Air intake system (leaks or blockages)

  • Exhaust gas leaks

MONITOR DESCRIPTION

If the electric EGR control valve is forcibly operated but the intake air amount does not vary, the ECM determines that the electric EGR control valve is malfunctioning. The ECM then illuminates the MIL.

WIRING DIAGRAM

A01KI0YE01

INSPECTION PROCEDURE

Note

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

Tech Tips


  • When this DTC is stored the vehicle enters fail-safe mode, in which the MIL blinks and the ECM measures elapsed time until an idle signal has been input or engine speed is below 200 rpm after 50 hours, after which engine output is limited to 75%.

  • Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, and other data from the time the malfunction occurred.

PROCEDURE


  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P2BAB)


    1. Connect the intelligent tester to the DLC3.

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

    3. Select the following menu items: Powertrain / Engine and ECT / DTC.

    4. Read DTCs.

      Result
      Display (DTC Output) Proceed to
      P2BAB A
      P2BAB and other DTCs B

      Tech Tips

      If codes other than P2BAB are output, perform troubleshooting for those DTCs first.


    B

    GO TO DTC CHART

    A

  2. CHECK FOR EXHAUST GAS LEAKS


    1. Check for exhaust gas leaks.

      Result
      Result Proceed to
      Exhaust gas leaks out from exhaust system A
      No leaks B

    B

    CHECK AIR INTAKE SYSTEM (AIR LEAKS AND BLOCKAGES) Click here

    A

  3. REPAIR EXHAUST GAS LEAK POINT


    1. Repair or replace the malfunctioning part in exhaust system.


    NEXT

  4. CHECK AIR INTAKE SYSTEM (AIR LEAKS AND BLOCKAGES)


    1. Check for air leaks and blockages in the air intake system.

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

      Tech Tips


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

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

      • Applying soapy water and revving the engine, air leaks from the air intake system can be checked.

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


    B

    INSPECT ELECTRIC EGR CONTROL VALVE ASSEMBLY (EGR VALVE OPERATION) Click here

    A

  5. REPAIR OR REPLACE AIR INTAKE SYSTEM


    1. Repair or replace the malfunctioning part in the air intake system.


    NEXT

  6. INSPECT ELECTRIC EGR CONTROL VALVE ASSEMBLY (EGR VALVE OPERATION)


    1. Inspect the electric EGR control valve assembly Click here.

      OK
      The valve is not stuck and does not have heavy carbon deposits
      Result
      Result Proceed to
      NG A
      OK B

    B

    CHECK FOR BLOCKAGE IN EGR GAS PASSAGE (EXHAUST MANIFOLD - EGR COOLER - ELECTRIC EGR CONTROL VALVE) Click here

    A

  7. REPLACE ELECTRIC EGR CONTROL VALVE ASSEMBLY


    1. Replace the electric EGR control valve assembly.


    NEXT

  8. CHECK FOR BLOCKAGE IN EGR GAS PASSAGE (EXHAUST MANIFOLD - EGR COOLER - ELECTRIC EGR CONTROL VALVE)


    1. Check for blockage in the EGR gas passage from the exhaust manifold, through the EGR cooler assembly to the electric EGR control valve assembly.

      OK
      No blockage in the EGR gas passage.
      Result
      Result Proceed to
      NG A
      OK B

    B

    CHECK WHETHER DTC OUTPUT RECURS Click here

    A

  9. REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA


    1. Repair or replace the malfunctioning parts, component and area.


    NEXT

  10. CHECK WHETHER DTC OUTPUT RECURS


    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 until the engine coolant temperature reaches 80°C (176°F).

    4. Drive the vehicle at 50 km/h (31 mph) or more and then fully release the accelerator pedal for 5 seconds or more.

    5. Select the following menu items: Powertrain / Engine and ECT / DTC.

    6. Read the DTC.

      Result
      Display (DTC Output) Proceed to
      P2BAB A
      No output B

    B

    END

    A

  11. REPLACE EGR COOLER ASSEMBLY


    1. Replace the EGR cooler assembly.


    NEXT

  12. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    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 until the engine coolant temperature reaches 80°C (176°F).

    4. Drive the vehicle at 50 km/h (31 mph) or more and then fully release the accelerator pedal for 5 seconds or more.

    5. Select the following menu items: Powertrain / Engine and ECT / DTC.

    6. Confirm that the DTC is not output again.

      Tech Tips

      If the DTC is output again, the mass air flow meter may be malfunctioning.


    NEXT

    END