ECD SYSTEM, Diagnostic DTC:P244B

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

DESCRIPTION

Refer to DTC P244A (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 0.37 for 3 seconds.

(1 trip detection logic)

  • DPNR 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
Table 1. 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 DPNR catalyst to monitor the differential pressure. If the differential pressure is large, the ECM determines that the DPNR catalyst is contaminated or has deteriorated and illuminates the MIL.

A244057E09

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 the fuel supply pump assembly, the ECM needs initialization (Click here).

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

Tip:

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 / Trouble Codes.

      Powertrain > Engine > 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.

      Tip:

      • 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 0.37 or more, it indicates a high possibility that DPNR 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 / Trouble Codes.

      Powertrain > Engine > Trouble Codes

    5. 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
      Tip:

      *: 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 P244C (Click here).

    B

    GO TO DTC CHARTClick 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 / Data List / 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
      A241154E04
      Tip:

      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 DPNR catalyst may be clogged.

    A

    CHECK FOR BLACK SMOKEClick here

    B

  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.

    Result

    Proceed to

    NEXT
    NEXT

  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.

      Tip:

      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-ASSEMBLYClick 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 / Data List / 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 0.37

      A

      Except above

      B
    A

    REPLACE EXHAUST MANIFOLD CONVERTER SUB-ASSEMBLYClick 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-MAIN NO. 1 fuse for 1 minute or more.

      Tip:

      • The accumulated PM volume stored in the ECM cannot be initialized using the GTS.

      • To perform PM forced regeneration, it is necessary to perform initialization of the accumulated PM volume stored in the ECM.

    2. Connect the GTS to the DLC3.

    3. Start the engine and drive the vehicle until the engine coolant temperature reaches 60°C (140°F) or higher.

    4. Move the shift lever to neutral and set the parking brake.

    5. Turn the GTS on.

    6. Enter the following menus: Powertrain / Engine / Active Test / Activate the DPF Rejuvenate (PM) / Data List / PM Accumulation Ratio.

      Powertrain > Engine > Active Test

      Active Test Display

      Activate the DPF Rejuvenate (PM)

      Data List Display

      PM Accumulation Ratio

    7. Perform the Active Test while the vehicle is driven at a constant vehicle speed within 50 to 100 km/h (31 to 62 mph) (transmission in 3rd gear) for more than 15 minutes.

      Tip:

      • While the "Activate the DPF Rejuvenate (PM)" Active Test is being performed, the accelerator opening angle should be kept as constant as possible.

      • When you start driving, "DPNR/DPF Status Reju (PM)" on the Data List displays "Compl". However, continue to drive the vehicle until "PM Accumulation Ratio" drops to 0%.

      • Once "PM Accumulation Ratio" drops to 0%, regeneration is complete.

    8. Continue to drive the vehicle until "PM Accumulation Ratio" drops to 0%.

      CAUTION:

      Be aware of excessive heat on and around the exhaust pipes during PM forced regeneration.

      Note:

      If PM forced regeneration stops, repair the malfunction that caused it to stop, and perform it again to complete the operation.

      Tip:

      • PM forced regeneration completes in 15 to 40 minutes.

      • PM forced regeneration time changes depending on PM Accumulation Ratio and driving conditions.

      • A fail-safe stops PM forced regeneration if Catalyst Differential Press increases too much during regeneration

      • Exhaust Temperature B1S2 becomes 500°C (932°F) or higher within 20 minutes of PM forced regeneration start.

      • PM forced regeneration will be stopped if the accelerator pedal is depressed during regeneration. In this case, PM forced regeneration needs to be performed again.

      • Even if PM forced regeneration stops while it is occurring, the GTS displays Compl (complete) for DPNR/DPF Status Reju (PM).

      Result

      PM forced regeneration completes normally.

    Result

    Proceed to

    OK

    NG
    OK

    END

    NG

    CHECK FUEL INJECTION SYSTEMClick here

  8. REPLACE EXHAUST MANIFOLD CONVERTER SUB-ASSEMBLY

    1. Even though it has been determined that the DPNR 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

    CHECK FUEL INJECTION SYSTEMClick here

  9. GO TO DTC CHART

    1. Perform inspection and repair of relevant DTCs.

      Click hereClick 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

    Tip:

    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 DPNR catalytic converter (Exhaust manifold converter sub-assembly).

      Click here

      Note:

      Perform Initialization procedure for DPF catalyst record clear.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

  14. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

    1. Clear the DTC and Exhaust Fuel Addition FB value by disconnecting the cable from the negative (-) battery terminal or removing the EFI-MAIN NO. 1 fuse for 1 minute or more.

      Tip:

      • The accumulated PM volume stored in the ECM cannot be initialized using the GTS.

      • To perform PM forced regeneration, it is necessary to perform initialization of the accumulated PM volume stored in the ECM.

    2. Connect the GTS to the DLC3.

    3. Start the engine and drive the vehicle until the engine coolant temperature reaches 60°C (140°F) or higher.

    4. Move the shift lever to neutral and set the parking brake.

    5. Turn the GTS on.

    6. Enter the following menus: Powertrain / Engine / Active Test / Activate the DPF Rejuvenate (PM) / Data List / PM Accumulation Ratio.

      Powertrain > Engine > Active Test

      Active Test Display

      Activate the DPF Rejuvenate (PM)

      Data List Display

      PM Accumulation Ratio

    7. Perform the Active Test while the vehicle is driven at a constant vehicle speed within 50 to 100 km/h (31 to 62 mph) (transmission in 3rd gear) for more than 15 minutes.

      Tip:

      • While the "Activate the DPF Rejuvenate (PM)" Active Test is being performed, the accelerator opening angle should be kept as constant as possible.

      • When you start driving, "DPNR/DPF Status Reju (PM)" on the Data List displays "Compl". However, continue to drive the vehicle until "PM Accumulation Ratio" drops to 0%.

      • Once "PM Accumulation Ratio" drops to 0%, regeneration is complete.

    8. Continue to drive the vehicle until "PM Accumulation Ratio" drops to 0%.

      CAUTION:

      Be aware of excessive heat on and around the exhaust pipes during PM forced regeneration.

      Note:

      If PM forced regeneration stops, repair the malfunction that caused it to stop, and perform it again to complete the operation.

      Tip:

      • PM forced regeneration completes in 15 to 40 minutes.

      • PM forced regeneration time changes depending on PM Accumulation Ratio and driving conditions.

      • A fail-safe stops PM forced regeneration if Catalyst Differential Press increases too much during regeneration

      • Exhaust Temperature B1S2 becomes 500°C (932°F) or higher within 20 minutes of PM forced regeneration start.

      • PM forced regeneration will be stopped if the accelerator pedal is depressed during regeneration. In this case, PM forced regeneration needs to be performed again.

      • Even if PM forced regeneration stops while it is occurring, the GTS displays Compl (complete) for DPNR/DPF Status Reju (PM).

    Result

    Proceed to

    NEXT
    NEXT

    END