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

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

DESCRIPTION

Refer to DTC P244A 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)

  • Front exhaust pipe 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.

A01KI80E03

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.

  • After replacing the fuel supply pump assembly or suction control valve, the ECM needs initialization Click here.

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

Tech Tips

Read freeze frame data using the intelligent tester. 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 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.

    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 1.41 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 FOR ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P244B)


    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 DTCs.

      Result
      Result Proceed to
      P244B is output A
      P2463 is detected just after P244B is detected*
      Other relevant DTCs are output B

      Tech Tips

      *: When DTC P2463 is detected just after P244B is detected, perform this diagnostic procedure. When DTC P2463 is not detected just after P244B is detected, perform the diagnostic procedure for P244C Click here.


    B

    GO TO DTC CHART Click here

    A

  3. READ VALUE USING INTELLIGENT TESTER (DPF DIFFERENTIAL PRESSURE)


    1. 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 / DPF Differential Pressure.

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

      Result
      Result Proceed to
      Except below A
      DPF Differential Pressure increases as engine speed increases from idle speed B
      A01KHCGE03

      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.


    B

    CHECK FOR BLACK SMOKE Click here

    A

  4. CLEAN OR REPLACE VACUUM TRANSMITTING HOSE


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


    NEXT

    CHECK FOR BLACK SMOKE Click here

  5. CHECK FOR BLACK SMOKE


    1. Start the engine and drive the vehicle until the engine coolant temperature reaches 60°C (140°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 FRONT EXHAUST PIPE ASSEMBLY (DPF CATALYST) Click here

    OK

  6. READ VALUE USING INTELLIGENT TESTER (CATALYST DIFFERENTIAL PRESS)


    1. 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 / Catalyst Differential Press.

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

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

    B

    REPLACE FRONT EXHAUST PIPE ASSEMBLY (DPF CATALYST) Click here

    A

  7. PERFORM PM FORCED REGENERATION


    1. Connect the intelligent tester to the DLC3.

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

    3. Clear the DTCs Click here.

    4. Perform PM forced regeneration Click here.

      OK
      PM forced regeneration completes normally.

    NG

    CHECK FUEL INJECTION SYSTEM Click here

    OK

    END

  8. REPLACE FRONT EXHAUST PIPE ASSEMBLY (DPF CATALYST)


    1. Even though it has been determined that the front exhaust pipe 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.


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

    2. Replace the front exhaust pipe assembly (DPF catalyst) Click here.

      Note

      Perform Initialization procedure for DPF catalyst record clear Click here.


    NEXT

  14. 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. Clear the DTCs Click here.

    4. Perform PM forced regeneration Click here.


    NEXT

    END