ECD SYSTEM(w/ Urea SCR System), Diagnostic DTC:P244B

DTC Code DTC Name
P244B Diesel Particulate Filter Differential Pressure Too High

DESCRIPTION

Refer to DTC P0420 Click here.

P244B
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Engine is running at 4000 rpm with no load for 10 seconds or more.

While driving, Catalyst Differential Pressure becomes more than 0.27 for 3 seconds.

(1 trip detection logic)

  • Exhaust manifold converter sub-assembly (DPF catalyst)

  • Differential pressure sensor

Common Inspection Item:


  • Fuel injection system

  • Intake/Exhaust system

  • After treatment control system
Related Data List
DTC No. Data List
P244B

  • DPF Differential Pressure

  • Catalyst Differential Press

  • Exhaust Fuel Addition FB

MONITOR DESCRIPTION

The ECM compares pressure upstream and downstream of the DPF catalyst to monitor the differential pressure. If the differential pressure is large, the ECM determines that the DPF catalyst is contaminated or has deteriorated and illuminates the MIL.

B001HJQE12

CAUTION / NOTICE / HINT

Note


  • After replacing the ECM, the new ECM needs registration (See page ) and initialization Click here.

  • After replacing an injector assembly, the ECM needs registration Click here.

Tech Tips

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


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG) and turn the GTS on.

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

    4. Record the stored DTC and freeze frame data.

    5. Check Exhaust Fuel Addition FB and Catalyst Differential Press in the freeze frame data.

      Tech Tips


      • When the Exhaust Fuel Addition FB value is 1.45 or more, it indicates a high possibility of insufficient temperature increase during PM forced regeneration.

      • When the Catalyst Differential Press value is 0.27 or more, it indicates a high possibility that DPF catalyst is clogged.


    NEXT

  2. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P244B)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG) and turn the GTS on.

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

    4. Read the DTCs.

      Result
      Result Proceed to
      DTC P244B is output A
      DTC P244B is output at the same time as P2463*
      Other relevant DTCs are output B

      Tech Tips

      *: When P244B is output at the same time as P2463, perform this diagnostic procedure. When DTC P244B is not output at the same time as P2463 is output, perform the diagnostic procedure for P0420 Click here.


    B

    GO TO DTC CHART Click here

    A

  3. READ VALUE USING GTS (DPF DIFFERENTIAL PRESSURE)


    1. Connect the GTS to the DLC3.

    2. Start the engine and turn the GTS on.

    3. Enter the following menus: Powertrain / Engine and ECT / Data List / DPF Differential Pressure.

    4. Check the DPF Differential Pressure values from idle speed to unloaded maximum engine speed.

      Result
      Result Proceed to
      DPF Differential Pressure increases as engine speed increases from idle speed A
      Except above B
      B001ETDE05

      Tech Tips

      If DPF Differential Pressure indicates negative pressure for approx. 1 second as shown in the illustration (A) when the engine speed increases, the differential pressure sensor piping of the DPF catalyst may be clogged.


    A

    CHECK FOR BLACK SMOKE Click here

    B

  4. CLEAN OR REPLACE AIR HOSE


    1. Even though it has been determined that the air hose needs to be repaired or cleaned, make sure to perform all diagnostic procedures for DTC P244B before repairing or cleaning it.


    NEXT

  5. CHECK FOR BLACK SMOKE


    1. Start the engine and drive the vehicle until the engine coolant temperature reaches 75°C (167°F) or higher.

    2. Stop the vehicle and allow the engine to idle.

    3. Fully depress the accelerator pedal for 5 seconds, and then release it [A].

    4. Repeat the above procedure [A] 10 times [B].

    5. Check for black smoke emission during procedures [A] and [B].

      OK
      Black smoke is emitted less than 5 times.

      Tech Tips

      Even if the black smoke is very thin, count the number of black smoke emissions if there is any visible smoke.


    NG

    REPLACE EXHAUST MANIFOLD CONVERTER SUB-ASSEMBLY Click here

    OK

  6. READ VALUE USING GTS (CATALYST DIFFERENTIAL PRESS)


    1. Connect the GTS to the DLC3.

    2. Start the engine and turn the GTS on.

    3. Enter the following menus: Powertrain / Engine and ECT / Data List / Catalyst Differential Press.

    4. Check the value of Catalyst Differential Press at 4000 rpm without load.

      Result
      Result Proceed to
      Catalyst Differential Press is more than 0.27 A
      Except above B

    A

    REPLACE EXHAUST MANIFOLD CONVERTER SUB-ASSEMBLY Click here

    B

  7. PERFORM PM FORCED REGENERATION


    1. Remove the EFI-MAIN NO.1 fuse or disconnect the cable from the battery terminal for 60 seconds or more, and then reinstall the EFI-MAIN NO.1 fuse or reconnect the cable to the battery terminal.

      Tech Tips


      • The amount of built up particulate matter recorded by the ECM cannot be initialized by the GTS.

      • If the amount of built up particulate matter recorded by the ECM is not initialized, PM forced regeneration cannot be performed using the GTS.

    2. Connect the GTS to the DLC3.

    3. Turn the engine switch on (IG) and turn the GTS on.

    4. Clear the DTCs Click here.

    5. Perform PM forced regeneration Click here.

      Result
      PM forced regeneration completes normally.

    OK

    END

    NG

    CHECK FUEL INJECTION SYSTEM Click here

  8. REPLACE EXHAUST MANIFOLD CONVERTER SUB-ASSEMBLY

    Even though it has been determined that the exhaust manifold converter sub-assembly (DPF catalyst) needs to be replaced, make sure to perform all diagnostic procedures for DTC P244B before replacing it.


    NEXT

    CHECK FUEL INJECTION SYSTEM Click here

  9. GO TO DTC CHART


    1. Perform inspection and repair of relevant DTCs Click here.


    NEXT

  10. CHECK FUEL INJECTION SYSTEM


    1. Check the fuel injection system Click here.


    NEXT

  11. CHECK INTAKE / EXHAUST SYSTEM


    1. Check the intake/exhaust system Click here.


    NEXT

  12. CHECK AFTER TREATMENT CONTROL SYSTEM


    1. Check the after treatment control system Click here.


    NEXT

  13. REPAIR OR REPLACE MALFUNCTIONING PARTS

    Tech Tips

    Repair, replace or clean the following items only when it has been determined necessary based on diagnosis for DTC P244B and P2463.


    1. Clean and/or repair the hoses of the differential pressure sensor.

    2. Replace the exhaust manifold converter sub-assembly (DPF catalyst) Click here.

      Note

      Perform Initialization procedure for "DPF catalyst record clear" and "DPF Deterioration Record Clear" Click here.


    NEXT

  14. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG) and turn the GTS on.

    3. Clear the DTCs Click here.

    4. Perform PM forced regeneration Click here.


    NEXT

    END