ECD SYSTEM (w/ DPF), Diagnostic DTC:P244A, P244C, P2463

DTC Code DTC Name
P244A Diesel Particulate Filter Differential Pressure Too Low
P244C Exhaust Temperature Too Low for Particulate Filter Regeneration Bank 1
P2463 Diesel Particulate Filter Restriction - Soot Accumulation

DESCRIPTION

Diesel Particulate Filter (DPF) 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.

A01KEIYE02
P244A
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
PM forced regeneration

When PM forced regeneration is manually performed, PM forced regeneration does not finish even after 60 minutes or more elapse.

(1 trip detection logic)

  • Front exhaust pipe assembly (oxidation catalyst)

  • Front exhaust pipe assembly (DPF catalyst)

  • Exhaust fuel addition injector assembly

  • No. 2 exhaust gas temperature sensor (B1S2)

  • No. 3 exhaust gas temperature sensor (B1S3)

Common Inspection Item:


  • Fuel injection system

  • Intake/Exhaust system

  • After treatment control system
P244C
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
PM forced regeneration

During PM forced regeneration, catalyst temperature does not increase sufficiently for 3 minutes.

(1 trip detection logic)

  • Front exhaust pipe assembly (oxidation catalyst)

  • Front exhaust pipe assembly (DPF catalyst)

  • Exhaust fuel addition injector assembly

  • No. 2 exhaust gas temperature sensor (B1S2)

  • No. 3 exhaust gas temperature sensor (B1S3)

Common Inspection Item:


  • Fuel injection system

  • Intake/Exhaust system

  • After treatment control system
P2463
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
PM forced regeneration

While driving, PM accumulation amount exceeds the limit.

(1 trip detection logic)

  • Front exhaust pipe assembly (oxidation catalyst)

  • Front exhaust pipe assembly (DPF catalyst)

  • Exhaust fuel addition injector assembly

  • No. 2 exhaust gas temperature sensor (B1S2)

  • No. 3 exhaust gas temperature sensor (B1S3)

Common Inspection Item:


  • Fuel injection system

  • Intake/Exhaust system

  • After treatment control system

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
P244A

  • Exhaust Fuel Addition FB

  • Catalyst Differential Press
P244C
P2463

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 DPF catalyst.

Excessive PM accumulation:

The ECM monitors the PM Accumulation Ratio and when the accumulated PM volume in the DPF catalyst exceeds the limit, the ECM illuminates the MIL.

Abnormal catalyst temperature increase:

The ECM monitors exhaust gas temperature increase while the exhaust fuel addition injector assembly adds fuel during PM forced regeneration. Exhaust gas temperature increases up to approximately 300 to 500°C (572 to 932°F) during PM forced regeneration. If the temperature does not increase even after a certain amount of time has elapsed, the ECM determines that the DPF catalyst is abnormal and illuminates the MIL.

Catalytic converter differential pressure too low:

When PM forced regeneration is manually performed, PM forced regeneration does not finish even after 60 minutes or more elapse, the ECM determines that there is problem with the DPF catalyst and illuminates the MIL.

A01KG7VE06

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.

  • After turning ignition switch off, waiting 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 P244A, P244B, P244C 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 EFI1 fuse or battery terminal and waiting for 60 seconds or more before connecting it again.

  • 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 regeneration control.

      • 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 P244A, P244C AND P2463)


    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
      P244A, P244C or P2463 is output A
      P2463 is detected just after P244B is detected* B
      Other relevant DTCs are output C

      Tech Tips


      • *: When DTC P2463 is detected just after P244B is detected, perform the inspection procedure for P244B.

      • When DTC P1603, P1604 or P1608 is output in addition to P244C, perform troubleshooting for P1603, P1604 or P1608 first.


    B

    GO TO DTC P244B Click here

    C

    GO TO DTC CHART Click here

    A

  3. 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.


    OK

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

    NG

    REPLACE FRONT EXHAUST PIPE ASSEMBLY (DPF CATALYST) Click here

  4. GO TO DTC CHART


    1. Diagnose relevant DTCs Click here.


    NEXT

  5. CHECK FOR WHITE SMOKE (DURING 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. Start the engine and warm it up until the engine coolant temperature reaches 60°C (140°F) or higher.

    5. Perform PM forced regeneration Click here.

    6. Check if excessive white smoke occurs when Exhaust Temperature B1S3 is 300°C (572°F) or more.

      Result
      Result Proceed to
      Excessive smoke occurs during PM forced regeneration (Exhaust Temperature B1S3 is 300°C (572°F)) A
      Except above B

      Tech Tips


      • When excessive white smoke occurs only during PM forced regeneration, uncombusted fuel passes through due to the deterioration of DPF catalyst is suspected.

      • When combustion control has a malfunction, deterioration or abnormality of driving performance can be felt despite PM forced regeneration being performed.


    B

    CHECK FUEL INJECTION SYSTEM Click here

    A

  6. 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 P244A, DTC P244C and P2463 before replacing it.

      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.


    NEXT

  7. CHECK FUEL INJECTION SYSTEM


    1. Check the fuel injection system Click here.


    NEXT

  8. CHECK INTAKE/EXHAUST SYSTEM


    1. Check the intake/exhaust system Click here.


    NEXT

  9. CHECK AFTER TREATMENT CONTROL SYSTEM


    1. Check the after treatment control system Click here.


    NEXT

  10. REPAIR OR REPLACE MALFUNCTIONING PARTS

    Tech Tips

    Replace the following items only when it has been determined necessary based on diagnosis for DTC P244A, P244C and P2463.


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

      Note

      Perform Initialization procedure for DPF catalyst record clear Click here.

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


    NEXT

  11. 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. Start the engine and warm it up until the engine coolant temperature reaches 60°C (140°F) or higher.

    5. Perform PM forced regeneration Click here.


    NEXT

    END