ECD SYSTEM(w/ DPF), Diagnostic DTC:P244B

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

DESCRIPTION

Refer to DTC P0420.

Click here

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P244B Diesel Particulate Filter Differential Pressure Too High While driving, Catalyst Differential Pressure becomes more than 0.45 for 3 seconds (1 trip detection logic).

  • DPF catalytic converter (exhaust manifold converter sub-assembly)

  • Differential pressure sensor assembly

Common Inspection Item:


  • Fuel injection system

  • Intake/Exhaust system

  • After treatment control system

 Comes on DTC stored
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.

B003PBSE06

CONFIRMATION DRIVING PATTERN

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

CAUTION / NOTICE / HINT

Note


  • After replacing the ECM, the new ECM needs registration (Click here) 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 DTC OUTPUT (RECORD STORED DTC AND FREEZE FRAME DATA)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON 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.


      Powertrain > Engine > Trouble Codes

    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 more than 0.45, it indicates a high possibility that DPF catalyst is clogged.

      Result
      Proceed to
      NEXT

    NEXT

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


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

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

    5. Read the DTCs.


      Powertrain > Engine > Trouble Codes
      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 / Diesel Exhaust / DPF Differential Pressure.


      Powertrain > Engine > Data List
      Tester Display
      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
      B003RVBE04

      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

    GO TO STEP 5 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.

      Result
      Proceed to
      NEXT

    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 procedure [A] 10 times [B].

    5. Check for black smoke emission during the 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.

      Result
      Proceed to
      OK
      NG

    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 / Diesel Exhaust / Catalyst Differential Press.


      Powertrain > Engine > Data List
      Tester Display
      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 0.45 A
      Except above B

    A

    GO TO STEP 8 Click here

    B

  7. PERFORM PM FORCED REGENERATION


    1. Clear the DTC and Exhaust Fuel Addition FB value by disconnecting the cable from the negative (-) battery terminal or removing the EFI-B fuse for 1 minute or more.

    2. Connect the GTS to the DLC3.

    3. Turn the ignition switch to ON and turn the GTS on.

    4. Clear the DTCs.


      Powertrain > Engine > Clear DTCs

    5. Warm up the engine (engine coolant temperature is 75°C (167°F) or higher).

    6. Perform PM forced regeneration.

      Click here

      Result
      PM forced regeneration completes normally.
      Result
      Proceed to
      OK
      NG

    OK

    END

    NG

    GO TO STEP 10 Click here

  8. REPLACE EXHAUST MANIFOLD CONVERTER SUB-ASSEMBLY


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

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 10 Click here

  9. GO TO DTC CHART


    1. Perform inspection and repair of relevant DTCs.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  10. CHECK FUEL INJECTION SYSTEM


    1. Check the fuel injection system.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  11. CHECK INTAKE / EXHAUST SYSTEM


    1. Check the intake/exhaust system.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  12. CHECK AFTER TREATMENT CONTROL SYSTEM


    1. Check the after treatment control system.

      Click here

      Result
      Proceed to
      NEXT

    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.


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

    2. Replace the exhaust manifold converter sub-assembly.

      Click here

      Note

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

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  14. 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 > Clear DTCs

    4. Warm up the engine (engine coolant temperature is 75°C (167°F) or higher).

    5. Perform PM forced regeneration.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    END