СИСТЕМА ECD, Diagnostic DTC:P1438

DTC Code DTC Name
P1438 Diesel Particulate Filter Overload

DESCRIPTION

The ECM detects the amount of deposits in the DPF catalyst in two stages.

This DTC is stored when the amount of deposits exceeds the threshold of the first stage.

When the vehicle is driven further and the amount of deposits exceeds the threshold of the second stage, the MIL illuminates.

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
P1438

Differential pressure (exhaust gas pressure) exceeding threshold detected for 20 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

  • Differential pressure sensor (exhaust gas pressure sensor)

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

  • ECM
Related Data List
DTC No. Data List
P1438 Filtered Pressure Value at Particle Filter Upstream (EU5)

INSPECTION PROCEDURE

Note


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

  • After replacing the DPF catalyst, 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 DTC AND MIL CONDITION


    1. Perform troubleshooting in accordance with the table below.

      Result
      Result Proceed to
      DTC P1438 is output, but MIL does not illuminate A
      DTC P1438 is output and MIL illuminates B
      DTC other than P1438 is output C

    B

    CHECK ENGINE OIL LEVEL AND REPLACEMENT INTERVAL Click here

    C

    GO TO DTC CHART Click here

    A

  2. 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

  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

    GO TO COOLING FAN SYSTEM Click here

    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 (EU5).

    4. Read the value.

      OK
      Difference between Data List item "Filtered Pressure Value at Particle Filter Upstream (EU5)" and Data List items "Atmosphere Pressure" and "MAP" is within 5 kPa.

    NG

    REPLACE DIFFERENTIAL PRESSURE SENSOR (EXHAUST GAS PRESSURE SENSOR) Click here

    OK

  5. READ VALUE USING GTS (FILTERED PRESSURE VALUE AT PARTICLE FILTER UPSTREAM (EU5))

    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 / Filtered Pressure Value at Particle Filter Upstream (EU5).

    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, "Filtered Pressure Value at Particle Filter Upstream (EU5)" 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, "Filtered Pressure Value at Particle Filter Upstream (EU5)" 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, "Filtered Pressure Value at Particle Filter Upstream (EU5)" value is within 20 kPa.

    NG

    REPLACE EXHAUST MANIFOLD CONVERTER SUB-ASSEMBLY (DPF CATALYTIC CONVERTER) Click here

    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 tail pipe for soot deposits.

        OK
        No soot deposits.

    NG

    REPLACE EXHAUST MANIFOLD CONVERTER SUB-ASSEMBLY (DPF CATALYTIC CONVERTER) Click here

    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 / Utylty / 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 16 (REPLACE EXHAUST MANIFOLD CONVERTER SUB-ASSEMBLY (DPF CATALYTIC CONVERTER).


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  8. 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

  9. 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

    GO TO COOLING FAN SYSTEM Click here

    OK

  10. 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 (EU5).

    4. Read the value.

      OK
      Difference between Data List item "Filtered Pressure Value at Particle Filter Upstream (EU5)" and Data List items "Atmosphere Pressure" and "MAP" is within 5 kPa.

      Tech Tips

      If a malfunction occurs during the check, replace the differential pressure sensor and proceed to the next step.


    OK

    READ VALUE USING GTS (FILTERED PRESSURE VALUE AT PARTICLE FILTER UPSTREAM (EU5)) Click here

    NG

    REPLACE DIFFERENTIAL PRESSURE SENSOR Click here

  11. REPLACE DIFFERENTIAL PRESSURE SENSOR


    1. Replace the differential pressure sensor (exhaust gas pressure sensor) Click here.


    NEXT

  12. READ VALUE USING GTS (FILTERED PRESSURE VALUE AT PARTICLE FILTER UPSTREAM (EU5))

    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 / Filtered Pressure Value at Particle Filter Upstream (EU5).

    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, "Filtered Pressure Value at Particle Filter Upstream (EU5)" 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, "Filtered Pressure Value at Particle Filter Upstream (EU5)" 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, "Filtered Pressure Value at Particle Filter Upstream (EU5)" value is within 20 kPa.

    NG

    REPLACE EXHAUST MANIFOLD CONVERTER SUB-ASSEMBLY (DPF CATALYTIC CONVERTER) Click here

    OK

  13. 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 tail pipe for soot deposits.

        OK
        No soot deposits.

    NG

    REPLACE EXHAUST MANIFOLD CONVERTER SUB-ASSEMBLY (DPF CATALYTIC CONVERTER) Click here

    OK

  14. 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 / Utylty / 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 16 (REPLACE EXHAUST MANIFOLD CONVERTER SUB-ASSEMBLY (DPF CATALYTIC CONVERTER).


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  15. REPLACE DIFFERENTIAL PRESSURE SENSOR (EXHAUST GAS PRESSURE SENSOR)


    1. Replace the differential pressure sensor (exhaust gas pressure sensor) Click here.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

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


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

    2. Perform DPF history information reset Click here.


    NEXT

  17. 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: Engine and ECT / Trouble Codes.

    8. Confirm that the DTC is not output again.


    NEXT

    END