ECD SYSTEM, Diagnostic DTC:P1443

DTC Code DTC Name
P1443 Particulate Filter Lamp Overload Inhibit Regeneration

DESCRIPTION

Tech Tips

For more information on the diesel particulate filter (DPF) catalyst regeneration control, refer to System Description Click here.

DTC No. DTC Detection Condition Trouble Area
P1443

Differential pressure exceeding threshold detected for 10 seconds or more

(3 trip detection logic)

Note

If the amount of soot is too large, the DPF catalytic converter may overheat during operation. Therefore, this DTC stops operation of the DPF catalytic converter when the amount of soot exceeds a predetermined amount.


  • Driven short distance

  • Oil level

  • Swirl control valve

  • Differential pressure sensor

  • Exhaust manifold converter sub-assembly (DPF catalytic converter)

  • ECM

Related Data List
DTC No. Data List
P1443
  • Filtered Pressure Value at Particle Filter Upstream

  • Adaptation Value of Differential Pressure at Particle Filter

CAUTION / NOTICE / HINT

Note


  • When replacing the ECM, the ECM needs Registration and Initialization Click here.

  • After replacing the DPF catalyst, the ECM needs initialization Click here.

  • After replacing the differential pressure sensor, the ECM needs initialization Click here.

  • After replacing the swirl control valve, the ECM needs initialization 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 the new ECM, perform all of the initialization/registrations 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.

PROCEDURE


  1. CHECK ENGINE OIL LEVEL AND REPLACEMENT INTERVAL


    1. Check the engine oil level and replacement interval, and then adjust the oil level or replace oil as necessary.


    NEXT
  2. PERFORM ACTIVE TEST USING GTS (ACTUATOR TEST OF SWIRL FLAP)


    1. Connect the GTS to the DLC3.

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

    3. Start the engine.

    4. Enter the following menus: Powertrain / Engine and ECT / Active Test / Actuator Test of Swirl Flap / Data List / Swirl Valve Actuator Position.

      OK
      The value of "Swirl Valve Actuator Position" changes according to the amount "Actuator Test of Swirl Flap" is operated, and the swirl flap operates smoothly.

    NG
    OK
  3. PERFORM ACTIVE TEST USING GTS (ACTUATOR TEST OF FAN HIGH SPEED)


    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 / Active Test / Actuator Test of Fan High Speed.

    4. Check that the cooling fan operates.

      OK
      The cooling fan operates normally

    NG
    OK
  4. CHECK DIFFERENTIAL PRESSURE SENSOR


    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 / Filtered Pressure Value at Particle Filter Upstream.

    4. Read the value.

      OK
      Difference between Data List item "Filtered Pressure Value at Particle Filter Upstream" and Data List items "Atmosphere Pressure" and "MAP" is within 8 kPa.

    NG
    OK
  5. READ VALUE USING GTS (ADAPTATION VALUE OF DIFFERENTIAL PRESSURE AT PARTICLE FILTER)

    Note

    The EGR valve is closed during the test.


    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 / Adaptation Value of Differential Pressure at Particle Filter.

    4. Start the engine and warm it up until the engine coolant temperature is 80°C (176°F) or higher.

    5. Test 1


      1. Idle the engine for 2 seconds.

      2. Read the value for 10 seconds.

        OK
        With the ignition switch ON, "Adaptation Value of Differential Pressure at Particle Filter" value is within 3.5 kPa.
    6. Test 2


      1. Maintain the engine speed at 2000 rpm for 2 seconds.

      2. Maintain the engine speed at 2000 rpm and read the value for 10 seconds.

        OK
        With the ignition switch ON, "Adaptation Value of Differential Pressure at Particle Filter" value is within 7.5 kPa.
    7. Test 3


      1. With the engine running without load at approximately 3800 rpm, wait for 2 seconds.

      2. With the engine running without load at approximately 3800 rpm, read the value for 10 seconds.

        OK
        With the ignition switch ON, "Adaptation Value of Differential Pressure at Particle Filter" value is within 20 kPa.

    NG
    OK
  6. CHECK EXHAUST MANIFOLD CONVERTER SUB-ASSEMBLY (DPF CATALYTIC CONVERTER)


    1. Check DPF catalytic converter for damage.


      1. Check downstream of the DPF catalytic converter and inside the exhaust tailpipe for soot deposits.

        OK
        No soot deposits.

    NG
    OK
  7. DPF REGENERATION PROCEDURE

    Note


      Check the following items before beginning the DPF regeneration procedure. If there is a malfunction with any of the following items, it may not be possible to perform DPF rejuvenation normally.

    • Engine oil level normal

    • 10 L of fuel or more remaining

    • No malfunction in intake system


    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 / Utility / DPF Rejuvenation Timing Reset.

    4. Driving test.


      1. Start the engine and warm it up until the engine coolant temperature is 80°C (176°F) or higher.

      2. Turn all electrical loads on (air conditioner, seat heater, etc.).

      3. Drive the vehicle at an average vehicle speed of 90 km/h (56 mph) or more for 2 hours or more.

    5. Enter the following menus: Powertrain / Engine and ECT / Data List / Distance Since Last Succeeded Regeneration.

    6. After DPF regeneration completes, check that "Distance Since Last Succeeded Regeneration" is 0 km.

      Note

      If the DPF regeneration procedure cannot complete, perform step 11 (REPLACE EXHAUST MANIFOLD CONVERTER SUB-ASSEMBLY (DPF CATALYTIC CONVERTER)).


    NEXT
  8. REPAIR OR REPLACE SWIRL CONTROL VALVE


    1. Repair or replace the swirl control valve Click here.

      Tech Tips

      When the swirl control valve is replaced, perform initialization.


    NEXT
  9. REPLACE DIFFERENTIAL PRESSURE SENSOR


    1. Replace the differential pressure sensor Click here.

    2. Perform the differential pressure learning value reset Click here.


    NEXT
  10. REPLACE EXHAUST MANIFOLD CONVERTER SUB-ASSEMBLY (DPF CATALYTIC CONVERTER)


    1. Replace the exhaust manifold converter sub-assembly (DPF catalytic converter) Click here.

    2. Perform the DPF history information reset and NOx storage catalyst learning value reset Click here.


    NEXT
  11. 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 Click here.

    4. Turn the ignition switch off and wait for 60 seconds or more [A].

    5. Perform road test [B].

    6. Repeat [A] and [B] for the number of trips detected.

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

    8. Confirm that the DTC is not output again.


    NEXT