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SFI SYSTEM(w/ Canister Pump Module), Diagnostic DTC:P04019C

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DTC Code DTC Name
P04019C Exhaust Gas Recirculation "A" Low / Insufficient Flow
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DESCRIPTION

Based on the driving conditions, the ECM regulates the volume of exhaust gas that is recirculated to each engine cylinder in order to lower the combustion temperature and reduce NOx emissions. The ECM monitors signals such as engine speed, engine coolant temperature, electric load, and vehicle speed. When the EGR permission conditions are met, the ECM controls the opening of the EGR valve linearly through signals to the EGR step motor.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory Note
P04019C Exhaust Gas Recirculation "A" Low / Insufficient Flow Change in intake manifold pressure is small when the EGR valve opened and closed during fuel cut operation (2 trip detection logic).

  • EGR valve assembly

  • EGR passage

  • EGR pipe with cooler sub-assembly

  • Intake system

  • Manifold absolute pressure sensor

 Comes on DTC stored SAE: P0401
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MONITOR DESCRIPTION

The ECM monitors the pressure inside the intake manifold while opening and closing the EGR valve during fuel cut operation. If there is no change in the manifold absolute pressure sensor value, the ECM interprets this as a malfunction of the EGR valve assembly, illuminates the MIL and stores this DTC.

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MONITOR STRATEGY

Required Sensors/Components (Main)

EGR valve assembly

Manifold absolute pressure sensor
Required Sensors/Components (Related) Engine coolant temperature sensor
Frequency of Operation Once per driving cycle
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TYPICAL ENABLING CONDITIONS

Engine speed 950 to 1600 rpm
Vehicle speed 20 km/h (12 mph) or more
Intake air temperature -10°C (14°F) or higher
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TYPICAL MALFUNCTION THRESHOLDS

Manifold pressure change Less than 1.75 kPa [0.3 psi]
At engine speed 2400 rpm
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CONFIRMATION DRIVING PATTERN


  1. Connect the GTS to the DLC3.

  2. Turn the power switch on (IG).

  3. Turn the GTS on.

  4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).

  5. Turn the power switch off and wait for at least 30 seconds.

  6. Turn the power switch on (IG).

  7. Turn the GTS on.

  8. Put the engine in Inspection Mode (2WD for measuring Exhaust Gas).

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  9. Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher [A].

  10. With the engine running, accelerate the vehicle to 75 km/h (47 mph) or more by depressing the accelerator pedal for at least 10 seconds [B].

    CAUTION:

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

    Tip:

    When accelerating the vehicle, depress the accelerator pedal more than normal to start the engine.

  11. Idle the engine for 30 seconds or more [C].

  12. With shift state M selected and the engine running, accelerate the vehicle to 75 km/h (47 mph) or more [D].

    CAUTION:

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

    Tip:

    If the engine stops, further depress the accelerator pedal to restart the engine.

  13. Perform the fuel cut operation for 5 seconds or more, with the accelerator pedal fully released [E].

  14. Enter the following menus: Powertrain / Engine / Trouble Codes [F].

  15. Read the pending DTCs.

    Tip:

    • If a pending DTC is output, the system is malfunctioning.

    • If a pending DTC is not output, perform the following procedure.

  16. Enter the following menus: Powertrain / Engine / Utility / All Readiness.

  17. Input the DTC P04019C.

  18. Check the DTC judgment result.

    GTS Display Description
    NORMAL

    • DTC judgment completed

    • System normal
    ABNORMAL

    • DTC judgment completed

    • System abnormal
    INCOMPLETE

    • DTC judgment not completed

    • Perform driving pattern after confirming DTC enabling conditions
    Tip:

    • If the judgment result shows NORMAL, the system is normal.

    • If the judgment result shows ABNORMAL, the system is malfunctioning.

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WIRING DIAGRAM

Refer to the DTC P040314.

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CAUTION / NOTICE / HINT

Note:

  • Vehicle Control History may be stored in the hybrid vehicle control ECU if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.

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    (Select Powertrain in Health Check and then check the time stamp data.)

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  • If any "Engine Malfunction" Vehicle Control History item has been stored in the hybrid vehicle control ECU, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Vehicle Control History.

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Tip:

  • By using the Control the EGR Step Position Active Test, the operation of the EGR valve can be checked.

  • If the EGR valve is normal and is opened using the Active Test, the Data List value changes as follows.

    Data List Item Change in Data List when Number of Steps is Increased Using Control the EGR Step Position Active Test
    Intake Manifold Absolute Pressure Pressure rises

  • Read freeze frame data using the GTS. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

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PROCEDURE


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    CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P04019C)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine / Trouble Codes.

    5. Read the DTCs.


      1. Powertrain > Engine > Trouble Codes


      Result
      Result Proceed to
      DTC P04019C is output A
      DTC P04019C and other DTCs are output B
      Tip:

      If any DTCs other than P04019C are output, troubleshoot those DTCs first.


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    READ VALUE USING GTS (INTAKE MANIFOLD ABSOLUTE PRESSURE)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine / Data List / Intake Manifold Absolute Pressure.


      1. Powertrain > Engine > Data List
        Tester Display
        Intake Manifold Absolute Pressure




    5. Read the value of Intake Manifold Absolute Pressure.

      Standard
      80 to 110 kPa (11.6 to 15.95 psi).
      Result
      Proceed to
      OK
      NG

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    PERFORM ACTIVE TEST USING GTS (CONTROL THE EGR STEP POSITION)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Put the engine in Inspection Mode (2WD for measuring Exhaust Gas).


      1. Powertrain > Hybrid Control > Utility
        Tester Display
        Inspection Mode




    5. Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher.

      Tip:

      The A/C switch and all accessories should be off.

    6. Enter the following menus: Powertrain / Engine / Active Test / Control the EGR Step Position / Data List / Intake Manifold Absolute Pressure and Engine Independent.


      1. Powertrain > Engine > Active Test
        Active Test Display
        Control the EGR Step Position
        Data List Display
        Intake Manifold Absolute Pressure
        Engine Independent






    7. According to the display on the GTS, compare the values of Data List item Intake Manifold Absolute Pressure before and while performing the Active Test.

      Note:

      • Make sure that the value of Data List item Engine Independent is "Operate" while performing the Active Test.

      • Do not leave the EGR valve open for 10 seconds or more during the Active Test.

      • Be sure to return the EGR valve to step 0 when the Active Test is completed.

      • Do not open the EGR valve 30 steps or more during the Active Test.

      Standard
      The value of Intake Manifold Absolute Pressure changes according to the EGR valve step set by the Active Test.
      Data List Control the EGR Step Position (Active Test)

      Before Active Test

      (Engine idling)

      		 0 Steps

      0 to 30 Steps

      (Engine idling)
      Intake Manifold Absolute Pressure 20 to 40 kPa (2.9 to 5.8 psi) (EGR valve is fully closed) Intake Manifold Absolute Pressure value is at least +10 kPa (1.45 psi) higher than when EGR valve is fully closed
      Tip:

      • If the value of Data List item Engine Independent is "Not Opr" when the engine is idling, charge control is being performed. Perform the Active Test after charge control is complete ("Operate" is displayed).

      • While performing the Active Test, if the increase in the value of Intake Manifold Absolute Pressure is small, the EGR valve assembly may be malfunctioning.

      • Even if the EGR valve assembly is malfunctioning, rough idling or an increase in the value of Intake Manifold Absolute Pressure may occur while performing the Active Test. However, the amount that the value of Intake Manifold Absolute Pressure increases will be smaller than normal.

      Result
      Result Proceed to
      Before performing the Active Test (while the engine is idling), the value of Intake Manifold Absolute Pressure is not between 20 to 40 kPa (2.9 to 5.8 psi). A
      When performing the Active Test to change the EGR valve step between 0 (EGR valve fully closed) and 30, the value of Intake Manifold Absolute Pressure changes less than 10 kPa (1.45 psi). B
      Other than above C

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    CHECK INTAKE SYSTEM


    1. Check the intake system for vacuum leaks.

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      OK
      No leaks from intake system.
      Tip:

      Perform "Inspection After Repair" after repairing or replacing the intake system.

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      Result
      Proceed to
      OK
      NG

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    INSPECT EGR VALVE ASSEMBLY


    1. Remove the EGR valve assembly.

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    2. Check if the EGR valve is stuck open.

      OK
      EGR valve is tightly closed.
      Tip:

      Perform "Inspection After Repair" after replacing the EGR valve assembly.

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      Result
      Proceed to
      OK
      NG

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    REPLACE EGR VALVE ASSEMBLY


    1. Replace the EGR valve assembly.

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      Tip:

      Perform "Inspection After Repair" after replacing the EGR valve assembly.

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      Result
      Proceed to
      NEXT

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    CLEAR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTCs.


      1. Powertrain > Engine > Clear DTCs


    5. Turn the power switch off and wait for at least 30 seconds.

      Result
      Proceed to
      NEXT

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    CHECK WHETHER DTC OUTPUT RECURS (DTC P04019C)


    1. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

    2. Enter the following menus: Powertrain / Engine / Trouble Codes.

    3. Read the DTCs.


      1. Powertrain > Engine > Trouble Codes


      Result
      Result Proceed to
      DTCs are not output A
      DTC P04019C is output B

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    REPLACE EGR COOLER ASSEMBLY


    1. Replace the EGR cooler assembly.

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      Tip:

      • If any of the EGR system related pipes (EGR pipe, exhaust manifold, etc.) are cracked, damaged or clogged, replace them as necessary.

      • Perform "Inspection After Repair" after replacing the EGR system.

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      Result
      Proceed to
      NEXT

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    CLEAR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTCs.


      1. Powertrain > Engine > Clear DTCs


    5. Turn the power switch off and wait for at least 30 seconds.

      Result
      Proceed to
      NEXT

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    CHECK WHETHER DTC OUTPUT RECURS (DTC P04019C)


    1. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

    2. Enter the following menus: Powertrain / Engine / Trouble Codes.

    3. Read the DTCs.


      1. Powertrain > Engine > Trouble Codes


      OK
      DTCs are not output.
      Result
      Proceed to
      NEXT

    • NEXT

      END

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    CLEAR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTCs.


      1. Powertrain > Engine > Clear DTCs


    5. Turn the power switch off and wait for at least 30 seconds.

      Result
      Proceed to
      NEXT

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    CHECK WHETHER DTC OUTPUT RECURS (DTC P04019C)


    1. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

    2. Enter the following menus: Powertrain / Engine / Trouble Codes.

    3. Read the DTCs.


      1. Powertrain > Engine > Trouble Codes


      Result
      Result Proceed to
      DTCs are not output A
      DTC P04019C is output B
      Tip:

      Perform "Inspection After Repair" after replacing the EGR valve assembly.

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