ECD SYSTEM(w/ Urea SCR System), Diagnostic DTC:P0420, P244A, P244B, P2458, P2463

DTC Code DTC Name
P0420 Catalyst System Efficiency Below Threshold (Bank 1)
P244A Diesel Particulate Filter Differential Pressure Too Low
P244B Diesel Particulate Filter Differential Pressure Too High
P2458 Diesel Particulate Filter Regeneration Duration
P2463 Diesel Particulate Filter Restriction - Soot Accumulation

DESCRIPTION

DPF (Diesel Particulate Filter) is an emission control system which processes the particulate matter (PM) that is emitted from a diesel engine. The DPF catalyst has a porous ceramic structure which has a PM collecting function. The PM that is collected is continuously treated by oxidation due to catalytic action at high temperatures, however PM accumulation increases at low catalyst temperatures because the oxidation process slows down. The ECM performs PM forced regeneration so that the amount of accumulated PM does not exceed the threshold.

B0024OFE02
DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P0420 Catalyst System Efficiency Below Threshold (Bank 1) During PM forced regeneration, DOC catalyst temperature does not increase sufficiently for 3 minutes (2 trip detection logic).

  • Exhaust manifold converter sub-assembly

  • Exhaust fuel addition injector assembly

Common Inspection Item:


  • Fuel injection system

  • Intake/Exhaust system

  • After treatment control system

 Comes on DTC stored
P244A Diesel Particulate Filter Differential Pressure Too Low When driving, the catalyst differential pressure is continuously below the threshold for 7 seconds or more (2 trip detection logic).

  • Exhaust manifold converter sub-assembly

  • Exhaust fuel addition injector assembly

Common Inspection Item:


  • Fuel injection system

  • Intake/Exhaust system

  • After treatment control system

 Comes on DTC stored
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).

  • Exhaust manifold converter sub-assembly

  • Differential pressure sensor

Common Inspection Item:


  • Fuel injection system

  • Intake/Exhaust system

  • After treatment control system

 Comes on DTC stored
P2458 Diesel Particulate Filter Regeneration Duration When PM forced regeneration is manually performed, PM forced regeneration does not finish even after 60 minutes or more elapse (1 trip detection logic).

  • Exhaust manifold converter sub-assembly

  • Exhaust fuel addition injector assembly

Common Inspection Item:


  • Fuel injection system

  • Intake/Exhaust system

  • After treatment control system

 Comes on DTC stored
P2463 Diesel Particulate Filter Restriction - Soot Accumulation While driving, PM accumulation amount exceeds the limit (1 trip detection logic).

  • Exhaust Manifold Converter sub-assembly

  • Exhaust fuel addition injector assembly

Common Inspection Item:


  • Fuel injection system

  • Intake/Exhaust system

  • After treatment control system

 Comes on DTC stored

Tech Tips

PM forced regeneration may be prohibited due to a fail-safe operation that is performed when another DTC is stored (including engine output limitation).

Related Data List
DTC No. Data List

P0420

P244A

P244B

P2458

P2463

  • Exhaust Fuel Addition FB

  • Catalyst Differential Press

  • DPF Differential Pressure

MONITOR DESCRIPTION

The ECM monitors the differential pressure between the upstream and downstream of the DPF catalyst and also monitors exhaust gas temperature to detect a malfunction in the exhaust manifold converter sub-assembly.






CONFIRMATION DRIVING PATTERN

DTC No. DTC Detection Drive Pattern

P0420

P244A

P2458

P2463

 PM forced regeneration
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

  • After turning ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

    Click here

Tech Tips


  • If DTC P2458 or P2463 is stored, fail-safe controls engine power output and PM forced regeneration is prohibited. In this case, PM forced regeneration can be performed after disconnecting the EFI-B fuse or battery terminal and waiting for 60 seconds or more before connecting it again.

  • 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.

    3. Turn the GTS on.

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

    5. Record the stored DTC and freeze frame data.


      Powertrain > Engine > Trouble Codes

    6. 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 regeneration control.

      • 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 P0420, P244A, P244B, P2458 AND P2463)


    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.

    5. Read the DTCs.


      Powertrain > Engine > Trouble Codes
      Result
      Result Proceed to
      DTC P244A is output A
      DTC P244B is output B
      DTC P244B is output at the same time as P2463
      DTC P0420, P2458 or P2463 is output C
      Other relevant DTCs are output D

      Tech Tips

      When DTC P1603, P1604 or P1608 is output in addition to P0420, perform troubleshooting for P1603, P1604 or P1608 first.


    C

    GO TO STEP 11 Click here

    D

    GO TO DTC CHART Click here

    B

    READ VALUE USING GTS (DPF DIFFERENTIAL PRESSURE) Click here

    A

  3. CHECK BLOCKAGE OF AIR HOSE AND VACUUM PIPE (DIFFERENTIAL PRESSURE SENSOR - VACUUM PIPE)

    CAUTION:

    Be careful of being burned by exhaust gases during the following inspection.

    Tech Tips

    Before checking the differential pressure sensor, perform a visual inspection of the differential pressure pipes and check that they are properly connected and no air is leaking from the pipes or hoses. If a malfunction is found, repair it before checking the sensor.


    1. B00250QC03
      *1 Air Hose

      Disconnect the air hoses (both upstream and downstream) from the differential pressure sensor.

    2. Start the engine.

    3. Check if there are exhaust gas pulsations from both air hoses during idling.

      OK
      Exhaust gas pulsation exists.
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE NO. 1 VACUUM PIPE OR NO. 2 VACUUM PIPE Click here

    OK

  4. READ VALUE USING GTS (DPF DIFFERENTIAL PRESSURE)


    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 / Data List / DPF Differential Pressure.

    4. Check that the differential pressure is as specified below.


      Powertrain > Engine > Data List
      Tester Display
      DPF Differential Pressure
      OK
      Approximately 0 kPa
      Result
      Proceed to
      OK
      NG

    NG

    GO TO STEP 6 Click here

    OK

  5. CONNECT UPSTREAM AIR HOSE


    1. B0026J3C01
      *1 Air Hose (Upstream)

      Connect the upstream air hose to the differential pressure sensor.

    2. Connect the GTS to the DLC3.

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

    4. Enter the following menus: Powertrain / Engine / Data List / DPF Differential Pressure.

    5. Start the engine.

    6. Engine is running at 4000 rpm with no load for 10 seconds or more.

    7. Check that the differential pressure is as specified below.


      Powertrain > Engine > Data List
      Tester Display
      DPF Differential Pressure
      Result
      DPF Differential Pressure Proceed to
      1.5 kPa or higher A
      Below 1.5 kPa B

    A

    GO TO STEP 7 Click here

    B

  6. REPLACE DIFFERENTIAL PRESSURE SENSOR


    1. Replace the differential pressure sensor.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  7. CONNECT DOWNSTREAM AIR HOSE


    1. Connect the downstream air hose to the differential pressure sensor.

      B0027HPC04
      *1 Air Hose (Downstream) - -

    2. Connect the GTS to the DLC3.

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

    4. Enter the following menus: Powertrain / Engine / Data List / DPF Differential Pressure.

    5. Start the engine.

    6. Engine is running at 4000 rpm with no load for 10 seconds or more.

    7. Check that the differential pressure is as specified below.


      Powertrain > Engine > Data List
      Tester Display
      DPF Differential Pressure
      Result
      DPF Differential Pressure Proceed to
      -1.5 to 1.5 kPa A
      Higher than 1.5 kPa B

    B

    GO TO STEP 11 Click here

    A

  8. REPLACE EXHAUST MANIFOLD CONVERTER SUB-ASSEMBLY


    1. It has been determined that the exhaust manifold converter sub-assembly needs to be replaced. However, perform all the troubleshooting procedures before replacing the exhaust manifold converter sub-assembly.

      Tech Tips

      If the differential pressure before and after the DPF is low, it is very likely that there is no DPF or the material inside the DPF is missing due to erosion, etc. If the DPF catalyst is eroded, do not replace the DPF at this time, as troubleshooting the cause and other repairs are necessary.

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 13 Click here

  9. REPAIR OR REPLACE NO. 1 VACUUM PIPE OR NO. 2 VACUUM PIPE


    1. Repair or replace No. 1 vacuum pipe or No. 2 vacuum pipe.

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 4 Click here

  10. GO TO DTC CHART


    1. Diagnose relevant DTCs.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  11. 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

    OK

    CHECK FOR WHITE SMOKE (DURING PM FORCED REGENERATION) Click here

    NG

  12. REPLACE EXHAUST MANIFOLD CONVERTER SUB-ASSEMBLY


    1. It has been determined that the exhaust manifold converter sub-assembly needs to be replaced. However, perform all the troubleshooting procedures before replacing the exhaust manifold converter sub-assembly.

      Tech Tips

      This DTC is stored because an excessive amount of PM has accumulated and resulted in abnormal combustion. It is necessary to diagnose the cause of abnormal PM accumulation and repair the problem. Therefore, do not perform replacement at this time.

      Result
      Proceed to
      NEXT

    NEXT

  13. CHECK FOR WHITE SMOKE (DURING PM FORCED REGENERATION)


    1. Remove the EFI-B fuse or disconnect the cable from the battery terminal for 60 seconds or more, and then reinstall the EFI-B 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. Turn the ignition switch to ON.

    3. Turn the ignition switch off and wait for 30 seconds or more.

    4. Turn the ignition switch to ON and wait for 10 seconds or more.

    5. Connect the GTS to the DLC3.

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

    7. Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher.

    8. Maintain the maximum possible engine speed under no load for 10 seconds to blow out all soot from inside the exhaust pipe.

      Tech Tips


      • If only a low engine speed is continuously maintained, soot may accumulate at the end of the catalyst.

      • When soot accumulates at the end of the catalyst, it may not be possible to perform PM forced regeneration control normally.

    9. Enter the following menus: Powertrain / Engine / Active Test / Activate the DPF Rejuvenate (PM) / Data List / Diesel Exhaust / Exhaust Temperature B1S2.

    10. Perform the Active Test.


      Powertrain > Engine > Active Test
      Active Test Display
      Activate the DPF Rejuvenate (PM)
      Data List Display
      Exhaust Temperature B1S2

      CAUTION:

      Be careful of the exhaust pipes and surrounding areas, as they become extremely hot when performing PM forced regeneration.

      Tech Tips

      When PM Accumulation Ratio is too low, Activate the DPF Rejuvenate (PM) cannot be performed. Therefore, rev the engine with no load at 3400 rpm for 5 to 10 minutes to increase PM Accumulation Ratio to 12% or more.

    11. Check for temperature increases and abnormal white smoke during PM forced regeneration.

      Tech Tips


      • PM forced regeneration takes 15 to 40 minutes to finish.

      • The time it takes to complete PM forced regeneration changes depending on "PM Accumulation Ratio" and the vehicle operating conditions.

      • If the value of "Catalyst Differential Press" increases too much during the PM forced regeneration, the fail-safe function activates and PM forced regeneration is stopped.

      • Perform PM forced regeneration control until the display on the multi-information display turns off.

      • If actions such as depressing the accelerator pedal or clutch pedal, etc. are performed during PM forced regeneration, PM forced regeneration stops. If PM forced regeneration stops, it is necessary to perform it again.

      • PM forced regeneration control is not complete until the display on the multi-information display turns off.

      Result
      Result Proceed to
      During PM forced regeneration, temperature of Exhaust Temperature B1S2 is 300 to 500°C and no white smoke is generated A
      During PM forced regeneration, temperature of Exhaust Temperature B1S2 is 300 to 500°C and abnormal white smoke is generated*1 B
      Other than above*2 C

      Tech Tips


      • *1: If abnormal white smoke is only generated during PM forced regeneration, there may be uncombusted fuel due to deterioration of the DPF catalyst.

      • *1: When there is a malfunction with combustion control, operation performance may be reduced and abnormalities may be felt even if PM forced regeneration is performed.

      • *2: An excess of accumulated PM is the result of a malfunction in the control system causing poor combustion and an increase in black smoke.


    B

    REPLACE EXHAUST MANIFOLD CONVERTER SUB-ASSEMBLY Click here

    C

    CHECK FUEL INJECTION SYSTEM Click here

    A

  14. REPLACE EXHAUST FUEL ADDITION INJECTOR ASSEMBLY


    1. It has been determined that the exhaust fuel addition injector assembly needs to be replaced. However, perform all the troubleshooting procedures before replacing the exhaust fuel addition injector assembly.

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 16 Click here

  15. REPLACE EXHAUST MANIFOLD CONVERTER SUB-ASSEMBLY


    1. It has been determined that the exhaust manifold converter sub-assembly needs to be replaced. However, perform all the troubleshooting procedures before replacing the exhaust manifold converter sub-assembly.

      Tech Tips

      If abnormal white smoke is only generated during PM forced regeneration, there may be uncombusted fuel due to deterioration of the DPF catalyst. When there is a malfunction with combustion control, operation performance may be reduced and abnormalities may be felt even if PM forced regeneration is performed.

      Result
      Proceed to
      NEXT

    NEXT

  16. CHECK FUEL INJECTION SYSTEM


    1. Check the fuel injection system.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  17. CHECK INTAKE/EXHAUST SYSTEM


    1. Check the intake/exhaust system.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  18. CHECK AFTER TREATMENT CONTROL SYSTEM


    1. Check the after treatment control system.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  19. REPAIR OR REPLACE MALFUNCTIONING PARTS

    Tech Tips

    Replace the following items only when it has been determined necessary based on diagnosis for DTC P0420, P244A, P244B, P2458 and P2463.


    1. Replace the exhaust manifold converter sub-assembly.

      Click here

      Note

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

      Click here

    2. Replace the exhaust fuel addition injector assembly.

      Click here

    3. Repair or replace the malfunctioning part confirmed in the diagnosis of the fuel injection system, intake/exhaust system and after treatment control system.

    4. Check for DTCs output in step 1.

      Result
      Result Proceed to
      DTC P244A is output A
      DTC other than DTC P244A output B

    B

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

    A

  20. READ VALUE USING GTS (DPF DIFFERENTIAL PRESSURE)


    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 / Data List / DPF Differential Pressure.


      Powertrain > Engine > Data List
      Tester Display
      DPF Differential Pressure

    4. Start the engine.

    5. Engine is running at 4000 rpm with no load for 10 seconds or more.

    6. Confirmation that the differential pressure is higher than 1.5 kPa.

      Result
      Proceed to
      NEXT

    NEXT

    END

  21. 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. Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher.

    5. Perform PM forced regeneration.

      Click here

      Result
      PM forced regeneration completes normally.
      Result
      Proceed to
      NEXT

    NEXT

    END

  22. 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 / Diesel Exhaust / DPF Differential Pressure.

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


      Powertrain > Engine > Data List
      Tester Display
      DPF Differential Pressure
      Result
      Result Proceed to
      DPF Differential Pressure increases as engine speed increases from idle speed A
      Except above B
      B0025LEE04

      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 25 Click here

    B

  23. CHECK BLOCKAGE OF AIR HOSE AND VACUUM PIPE (DIFFERENTIAL PRESSURE SENSOR - VACUUM PIPE)

    CAUTION:

    Be careful of being burned by exhaust gases during the following inspection.

    Tech Tips

    Before checking the differential pressure sensor, perform a visual inspection of the differential pressure pipes and check that they are properly connected and no air is leaking from the pipes or hoses. If a malfunction is found, repair it before checking the sensor.


    1. B00250QC03
      *1 Air Hose

      Disconnect the air hoses (both upstream and downstream) from the differential pressure sensor.

    2. Start the engine.

    3. Check if there are exhaust gas pulsations from both air hoses during idling.

      OK
      Exhaust gas pulsation exists.
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE NO. 1 VACUUM PIPE OR NO. 2 VACUUM PIPE Click here

    OK

  24. REPLACE DIFFERENTIAL PRESSURE SENSOR


    1. Replace the differential pressure sensor.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  25. 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

  26. 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 / Diesel Exhaust / Catalyst Differential Press.

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


      Powertrain > Engine > Data List
      Tester Display
      Catalyst Differential Press
      Result
      Result Proceed to
      Catalyst Differential Press is more than 0.45 A
      Except above B

    A

    GO TO STEP 30 Click here

    B

    PERFORM PM FORCED REGENERATION Click here

  27. REPAIR OR REPLACE NO. 1 VACUUM PIPE OR NO. 2 VACUUM PIPE


    1. Repair or replace No. 1 vacuum pipe or No. 2 vacuum pipe.

      Result
      Proceed to
      NEXT

    NEXT

  28. 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 / Diesel Exhaust / DPF Differential Pressure.

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


      Powertrain > Engine > Data List
      Tester Display
      DPF Differential Pressure
      B0025LEE04

      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.

      OK
      DPF Differential Pressure increases as engine speed increases from idle speed.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO STEP 24 Click here

    OK

    GO TO STEP 25 Click here

  29. PERFORM PM FORCED REGENERATION


    1. Remove the EFI-B fuse or disconnect the cable from the battery terminal for 60 seconds or more, and then reinstall the EFI-B 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 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 16 Click here

  30. REPLACE EXHAUST MANIFOLD CONVERTER SUB-ASSEMBLY


    1. Even though it has been determined that the 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 16 Click here