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

DTC Code DTC Name
P244A Diesel Particulate Filter Differential Pressure Too Low

DESCRIPTION

Refer to DTC P2454 Click here.

Tech Tips

If the DPF catalytic converter is melted away or is removed due to a modification, the ECM interprets this as abnormal pressure difference, DTC P244A will be stored and the MIL will be illuminated.

P244A
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
20 seconds elapsed after engine stop

The differential pressure indicates 0 kPa or less for 2 seconds or more

(2 trip detection logic)

  • Incorrect vacuum transmitting hose routing

  • Vacuum transmitting hose is clogged

  • Blockage in transmitting pipe

  • Differential pressure sensor

  • No. 2 exhaust manifold converter sub-assembly (DPF catalytic converter)

  • Exhaust system modification
DTC No. Data List
P244A DPF Differential Pressure

Tech Tips


  • DTC P2454 (Differential pressure sensor circuit low) and/or DTC P2455 (Differential pressure sensor high) will be present if there is an open or short in the differential pressure sensor circuit.

  • This DTC may also be stored due to the fail-safe operation of the other DTCs.

CAUTION / NOTICE / HINT

Note

When replacing the ECM and/or DPF catalyst, the ECM needs Registration and Initialization Click here.

Tech Tips


  • When the ECM must be replaced, before replacing the ECM, perform the "Learning Values Save" function using the intelligent tester. Then after installing the new ECM, perform all of the initialization/registrations for the "Learning Values Write" function by following the instructions shown on the tester display.

  • 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.

  • Check the DPF Differential Pressure using the intelligent tester by entering the following menus: Powertrain / Engine and ECT / Data List / DPF Differential Pressure. For reference, the results of a real-vehicle check are shown in the table below:

    DPF Differential Pressure (Result of Real-Vehicle Check)
    Condition DPF Differential Pressure
    Idling (warm up the engine) 0.296 kPa
    Running without load (2500 rpm) 1.496 kPa
    Running without load (4000 rpm) 2.496 kPa
    Driving with the accelerator fully open at 2000 rpm 2.199 kPa
    Driving with the accelerator fully open at 3000 rpm 4.097 kPa
    Driving with the accelerator fully open at 4500 rpm 4.898 kPa

PROCEDURE


  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P244A)


    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 the DTCs.

      Result
      Result Proceed to
      DTC P244A A
      DTC P244A and other DTCs B

      Tech Tips

      If DTCs other than P244A are output, perform troubleshooting for those DTCs first.


    B

    GO TO DTC CHART Click here

    A

  2. CHECK CONNECTION OF VACUUM TRANSMITTING HOSE ASSEMBLY (DIFFERENTIAL PRESSURE SENSOR - TRANSMITTING PIPE)

    CAUTION:

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

    Note


    • Confirm the paint marks on the vacuum transmitting hoses before disconnecting them.

    • Check that the vacuum transmitting hose connections are on the correct side of the DPF/DPNR catalytic converter.


    1. Disconnect the vacuum transmitting hose (both upstream and downstream) on the differential pressure sensor side.

      A01VF55E09
      Text in Illustration
      *1 Differential Pressure Sensor *2 No. 1 Vacuum Transmitting Hose (for upstream)
      *3 No. 1 Vacuum Transmitting Hose (for downstream) - -
      *a Marked: Yellow *b Marked: Pink
      *c Marked: Red *d Marked: Orange

    2. Start the engine.

    3. Check if there is exhaust gas pulsation from both vacuum transmitting hoses while the engine is idling.

      OK
      The vacuum transmitting hose connections are correct and there is no leak or blockage.

    NG

    REPLACE CLOGGED PARTS Click here

    OK

  3. CHECK EXHAUST SYSTEM


    1. Check for exhaust gas leak from the exhaust system.

    2. Check for exhaust system modifications.

      OK
      No exhaust gas leak and no modifications.

    NG

    REPAIR OR REPLACE EXHAUST SYSTEM Click here

    OK

  4. INSPECT DIFFERENTIAL PRESSURE SENSOR


    1. Inspect the differential pressure sensor Click here.

      OK
      Approximately the same pressure as the applied pressure is indicated.

      Tech Tips

      The DPF Differential Pressure display is a value that does not reflect the zero point adjustment. Therefore the displayed value will be about +/-0.3 kPa even if the applied differential pressure is 0 kPa.


    NG

    REPLACE DIFFERENTIAL PRESSURE SENSOR Click here

    OK

  5. PERFORM DIFFERENTIAL PRESSURE SENSOR LEARNING


    1. Start the engine and wait until the engine coolant temperature reaches 75°C (167°F) or more (A).

    2. Turn the ignition switch off and wait for 30 seconds or more (B).

    3. Repeat the above procedures (A) and (B) 3 times.

      Tech Tips

      Procedures (A) and (B) must be repeated 3 times to complete the differential pressure sensor learning process.


    NEXT

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


    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 / Data List / DPF Differential Pressure.

    4. Read the value.

    5. Start the engine.

    6. Run the engine at 4500 rpm without load.

    7. Compare the value at 4500 rpm with the value at ignition switch ON.

      Tech Tips

      When reading the values of Data List, confirm that PM regeneration is not activating (value of "After Injection Period" is 0) by entering the following menus: Powertrain / Engine and ECT / Data List / After Injection Period.

      If PM regeneration is activating (value of "After Injection Period" is not 0), drive the vehicle until the PM regeneration is complete (value of "After Injection Period" becomes 0).

      Standard
      "DPF Differential Pressure at 4500 rpm" - "DPF Differential Pressure at ignition switch ON" is 1.0 kPa or more.
      Result
      Result Proceed to
      Less than 1.0 kPa A
      1.0 kPa or more B

    A

    CHECK WHETHER DTC OUTPUT RECURS (DTC P244A) Click here

    B

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  7. REPLACE CLOGGED PARTS


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  8. REPAIR OR REPLACE EXHAUST SYSTEM


    1. Repair or replace the modification in the exhaust system.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  9. REPLACE DIFFERENTIAL PRESSURE SENSOR


    1. Replace the differential pressure sensor assembly Click here.

    2. Start the engine and wait until the engine coolant temperature reaches 75°C (167°F) or more (A).

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

    4. Repeat the above procedures (A) and (B) 3 times.

      Tech Tips

      Procedures (A) and (B) must be repeated 3 times to complete the differential pressure sensor learning process.


    NEXT

  10. INSPECT DIFFERENTIAL PRESSURE SENSOR


    1. Inspect the differential pressure sensor Click here.

      OK
      Approximately the same pressure as the applied pressure is indicated.

      Tech Tips

      The DPF Differential Pressure display is a value that does not reflect the zero point adjustment. Therefore the displayed value will be about +/-0.3 kPa even if the applied differential pressure is 0 kPa.


    OK

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

    NG

  11. REPLACE ECM


    1. Replace the ECM Click here.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  12. CHECK WHETHER DTC OUTPUT RECURS (DTC P244A)


    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. Turn the ignition switch off and wait for 30 seconds.

    5. Start the engine.

    6. Drive the vehicle at a vehicle speed of approximately 100 km/h (62 mph) and accelerator pedal depress for 10 minutes or more.

      CAUTION:

      When performing the confirmation driving pattern, obey all speed limits and traffic laws.

      Tech Tips


      • When reading the values of Data List, confirm that PM regeneration is not activating (value of "After Injection Period" is 0).

      • "PM Accumulation Ratio" is more than 14%.

    7. Turn the ignition switch off and wait for 30 seconds.

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

    9. Enter the following menus: Powertrain / Engine and ECT / DTC / Pending.

    10. Read the pending DTCs.

      Tech Tips

      Perform the following procedure using the tester to determine whether or not the DTC judgment has been carried out.


      1. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

      2. Input DTC P244A.

      3. Check that STATUS is NORMAL. If STATUS is INCOMPLETE or N/A, repeat the procedures (C) and (D).

        Result
        Result Proceed to
        NORMAL A
        ABNORMAL B

    A

    CHECK FOR INTERMITTENT PROBLEMS Click here

    B

  13. REPLACE NO. 2 EXHAUST MANIFOLD CONVERTER SUB-ASSEMBLY (DPF CATALYTIC CONVERTER)


    1. Replace the No. 2 exhaust manifold converter sub-assembly Click here.


    NEXT

  14. PERFORM INITIALIZATION (DPF DETERIORATION RECORD)


    1. Reset the DPF deterioration record Click here.


    NEXT

  15. 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. Turn the ignition switch off and wait for 30 seconds.

    5. Start the engine.

    6. Drive the vehicle at an vehicle speed of approximately 100 km/h (62 mph) for 10 minutes or more.

      CAUTION:

      When performing the confirmation driving pattern, obey all speed limits and traffic laws.

      Tech Tips


      • When reading the values of Data List, confirm that PM regeneration is not activating (value of "After Injection Period" is 0).

      • "PM Accumulation Ratio" is more than 14%.

    7. Turn the ignition switch off and wait for 30 seconds.

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

    9. Enter the following menus: Powertrain / Engine and ECT / DTC / Pending.

    10. Confirm that the pending DTC is not output again.

      Tech Tips

      Perform the following procedure using the tester to determine whether or not the DTC judgment has been carried out.


      1. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

      2. Input DTC P244A.

      3. Check that STATUS is NORMAL. If STATUS is INCOMPLETE or N/A, repeat the procedures (C) and (D).


    NEXT

    END