ECD SYSTEM(w/ Glow Plug Controller), 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 has melted or is removed or modified, the ECM interprets this as an abnormal pressure difference, stores DTC P244A and illuminates the MIL.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P244A Diesel Particulate Filter Differential Pressure Too Low

The maximum differential pressure is threshold or less while engine is running

(DPF Regeneration)

(2 trip detection logic)

  • Incorrect vacuum transmitting hose routing

  • Vacuum transmitting hose is clogged

  • Blockage in vacuum transmitting pipe

  • Differential pressure sensor

  • No. 2 exhaust manifold (catalytic converter)

  • Exhaust system modification

 Comes on DTC stored
DTC Detection Drive Pattern
DTC No. DTC Detection Drive Pattern
P244A 20 seconds have elapsed since engine stopped
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 other DTCs.

CAUTION / NOTICE / HINT

Note

When replacing the ECM and/or DPF catalyst, perform ECM Initialization and Registration.

Click here

Tech Tips


  • When the ECM must be replaced, before replacing the ECM, perform the "Learning Values Save" function using the GTS. Then after installing a new ECM, perform all of the initialization and registration procedures for the "Learning Values Write" function by following the instructions shown on the GTS display.

  • 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.

  • Check the DPF Differential Pressure using the GTS by entering the following menus: Powertrain / Engine and ECT / Data List / DPF Differential Pressure.

    DPF Differential Pressure (Reference Value)
    Condition DPF Differential Pressure
    Idling (warm up the engine) -0.5 to 0.5 kPa
    Running without load (2500 rpm) 0 to 1.0 kPa
    Running without load (4000 rpm) 0.5 to 1.5 kPa

PROCEDURE


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


    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 and ECT / Trouble Codes.

    4. Read the DTCs.


      Powertrain > Engine and ECT > Trouble Codes
      Result
      Result Proceed to
      DTC P244A is output A
      DTC P244A and other DTCs are output 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 - VACUUM 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 both vacuum transmitting hoses (upstream and downstream) on the differential pressure sensor side.

      B00450OC01
      *1 Differential Pressure Sensor *2 Vacuum Transmitting Hose (for upstream)
      *3 No. 2 Vacuum Transmitting Hose (for downstream) - -
      *a Marked: White *b Marked: Red
      *c Marked: Red *d Marked: Yellow
      *e Marked: Orange *f Marked: Blue

    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 hoses connections are correct and there is no leak or blockage.
      Result
      Proceed to
      OK
      NG

    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.
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE EXHAUST SYSTEM Click here

    OK

  4. INSPECT DIFFERENTIAL PRESSURE SENSOR


    1. Inspect the differential pressure sensor.

      Click here

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

      Tech Tips

      The DPF Differential Pressure displayed 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.

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE DIFFERENTIAL PRESSURE SENSOR Click here

    OK

  5. PERFORM DIFFERENTIAL PRESSURE SENSOR LEARNING


    1. Start the engine and allow it to idle until the engine coolant temperature reaches 75°C (167°F) or higher (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.

      Result
      Proceed to
      NEXT

    NEXT

  6. 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 and ECT / Data List / DPF Differential Pressure.


      Powertrain > Engine and ECT > Data List
      Tester Display
      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 when the ignition switch is first turned ON.

      Tech Tips

      When reading the values of Data List, confirm that PM regeneration is not activated (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 activated (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 higher.
      Result
      Result Proceed to
      Less than 1.0 kPa A
      1.0 kPa or higher B

    B

    GO TO STEP 15 Click here

    A

  7. CHECK WHETHER DTC OUTPUT RECURS (DTC P244A)


    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 and ECT > Clear DTCs

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

    5. Turn the ignition switch to ON.

    6. Turn the GTS on.

    7. Start the engine.

    8. Enter the following menus: Powertrain / Engine and ECT / Active Test / Activate the DPF Rejuvenate (PM) / Data List / DPNR/DPF Status Reju(PM).


      Powertrain > Engine and ECT > Active Test
      Active Test Display
      Activate the DPF Rejuvenate (PM)
      Data List Display
      DPNR/DPF Status Reju(PM)

      Tech Tips

      After clearing DTCs, immediately enter the Active Test and then drive the vehicle.

    9. Perform the Active Test and then drive the vehicle at a constant engine speed of 2000 rpm or more (shift position: 3rd gear) at a vehicle speed between 65 to 100 km/h (40 to 62 mph).

      CAUTION:

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

      Tech Tips

      While the Active Test being performed, the accelerator pedal opening angle should be kept as constant as possible.

    10. Check that "DPNR/DPF Status Reju (PM)" is "Compl" (Forced regeneration is complete).

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

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

    13. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending.

    14. Read the pending DTCs.


      Powertrain > Engine and ECT > Trouble Codes
      Result
      Result Proceed to
      DTC is not output A
      DTC P244A is output B

    A

    CHECK FOR INTERMITTENT PROBLEMS Click here

    B

  8. REPLACE NO. 2 EXHAUST MANIFOLD (DPF CATALYTIC CONVERTER)


    1. Replace the No. 2 exhaust manifold.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  9. PERFORM INITIALIZATION


    1. Clear the DPF deterioration record using the GTS.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 15 Click here

  10. REPLACE DIFFERENTIAL PRESSURE SENSOR


    1. Replace the differential pressure sensor.

      Click here

    2. Start the engine and allow it to idle until the engine coolant temperature reaches 75°C (167°F) or higher (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.

      Result
      Proceed to
      NEXT

    NEXT

  11. INSPECT DIFFERENTIAL PRESSURE SENSOR


    1. Inspect the differential pressure sensor.

      Click here

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

      Tech Tips

      The DPF Differential Pressure displayed 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.

      Result
      Proceed to
      OK
      NG

    OK

    GO TO STEP 15 Click here

    NG

    REPLACE ECM Click here

  12. REPAIR OR REPLACE EXHAUST SYSTEM


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

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 15 Click here

  13. REPLACE ECM


    1. Replace the ECM.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 15 Click here

  14. REPLACE CLOGGED PARTS

    Result
    Proceed to
    NEXT

    NEXT

  15. 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 and ECT > Clear DTCs

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

    5. Turn the ignition switch to ON.

    6. Turn the GTS on.

    7. Start the engine.

    8. Enter the following menus: Powertrain / Engine and ECT / Active Test / Activate the DPF Rejuvenate (PM) / Data List / DPNR/DPF Status Reju(PM).


      Powertrain > Engine and ECT > Active Test
      Active Test Display
      Activate the DPF Rejuvenate (PM)
      Data List Display
      DPNR/DPF Status Reju(PM)

      Tech Tips

      After clearing DTCs, immediately enter the Active Test and then drive the vehicle.

    9. Perform the Active Test and then drive the vehicle at a constant engine speed of 2000 rpm or more (shift position: 3rd gear) at a vehicle speed between 65 to 100 km/h (40 to 62 mph).

      CAUTION:

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

      Tech Tips

      While the Active Test being performed, the accelerator pedal opening angle should be kept as constant as possible.

    10. Check that "DPNR/DPF Status Reju (PM)" is "Compl" (Forced regeneration is complete).

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

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

    13. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending.

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


      Powertrain > Engine and ECT > Trouble Codes
      Result
      Proceed to
      NEXT

    NEXT

    END