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

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

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 Code: P0401

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.

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

TYPICAL ENABLING CONDITIONS

Engine speed 950 to 1600 rpm
Vehicle speed 21 km/h (13 mph) or more
Intake air temperature -10°C (14°F) or higher

TYPICAL MALFUNCTION THRESHOLDS

Manifold pressure change Less than 1.72 kPa [0.25 psi]
At engine speed 1050 rpm

CONFIRMATION DRIVING PATTERN

B004PJEE21

  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 (Maintenance Mode).

    Click here

  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 or more [B].

    CAUTION:

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

    Tech Tips

    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 brake (B) 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.

    Tech Tips

    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.

    Tech Tips


    • 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
    N/A

    • Unable to perform DTC judgment

    • Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    Tech Tips


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

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

    • If the DTC judgment result is INCOMPLETE or N/A, perform steps [D] and [E].

WIRING DIAGRAM

Refer to the DTC P040314.

Click here

CAUTION / NOTICE / HINT

Tech Tips


  • 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.

PROCEDURE


  1. 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.


      Powertrain > Engine > Trouble Codes
      Result
      Result Proceed to
      DTC P04019C is output A
      DTC P04019C and other DTCs are output B

      Tech Tips

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


    B

    GO TO DTC CHART Click here

    A

  2. 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.


      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
      Result Proceed to
      The value of Intake Manifold Absolute Pressure is between 80 kPa(abs) and 110 kPa(abs) OK
      Other than above NG

      Tech Tips


      • 80 kPa = 11.6 psi

      • 110 kPa = 15.95 psi


    NG

    REPLACE MANIFOLD ABSOLUTE PRESSURE SENSOR Click here

    OK

  3. 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. Put the engine in Inspection Mode (Maintenance Mode).


      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.

      Tech Tips

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

    6. Enter the following menus: Powertrain / Engine / Data List / Intake Manifold Absolute Pressure and Engine Independent.


      Powertrain > Engine > Data List
      Tester Display
      Intake Manifold Absolute Pressure
      Engine Independent

    7. Confirm that the value of Data List item Engine Independent is "Operate" then check the value of Intake Manifold Absolute Pressure.

      Standard
      Engine Condition GTS Display
      Engine Independent Intake Manifold Absolute Pressure
      Idling Operate 20 to 40 kPa (2.9 to 5.8 psi)

      Tech Tips

      If the value of Data List item Engine Independent is "Not Opr" when the engine is idling, charge control is being performed. Check the Intake Manifold Absolute Pressure after charge control is complete ("Operate" is displayed).

      Result
      Result Proceed to
      The value of the Intake Manifold Absolute Pressure is not between 20 kPa(abs) and 40 kPa(abs) A
      Other than above B

      Tech Tips


      • 20 kPa = 2.9 psi

      • 40 kPa = 5.8 psi


    B

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

    A

  4. CHECK INTAKE SYSTEM


    1. Check the intake system for vacuum leaks.

      Click here

      OK
      No leaks from intake system.
      Result
      Proceed to
      OK
      NG

    NG

    Perform "Inspection After Repair" after replacing the intake system. Click here

    OK

  5. INSPECT EGR VALVE ASSEMBLY


    1. Remove the EGR valve assembly.

      Tech Tips

      Click here

    2. Check if the EGR valve is stuck open.

      OK
      EGR valve is tightly closed.
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE MANIFOLD ABSOLUTE PRESSURE SENSOR Click here

    NG

    REPLACE EGR VALVE ASSEMBLY Click here Perform "Inspection After Repair" after replacing the EGR valve assembly. Click here

  6. 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 (Maintenance Mode).


      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.

      Tech Tips

      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, EGR Step Position and Engine Independent.


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

    7. Confirm that the value of Data List item Engine Independent is "Operate" then check the value of Intake Manifold Absolute Pressure while performing the Active Test.

      Note


      • 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.

      OK
      The value of Intake Manifold Absolute Pressure changes in response to the EGR step position when the value of Engine Independent is "Operate".
      Standard
      Data List Control the EGR Step Position (Active Test)
      0 Steps 0 to 30 Steps

      Intake Manifold Absolute Pressure

      (Data List)

      		 (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

      Tech Tips


      • 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
      The value of Intake Manifold Absolute Pressure increases by 10 kPa(abs) or more, compared to when the EGR valve was fully closed (0 step) OK
      Other than above NG

      Tech Tips

      10 kPa = 1.45 psi


    NG

    CLEAR DTC Click here

    OK

  7. REPLACE EGR VALVE ASSEMBLY


    1. Replace the EGR valve assembly.

      Tech Tips


      Result
      Proceed to
      NEXT

    NEXT

  8. 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.


      Powertrain > Engine > Clear DTCs

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

      Result
      Proceed to
      NEXT

    NEXT

  9. 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.


      Powertrain > Engine > Trouble Codes
      Result
      Result Proceed to
      DTCs are not output A
      P04019C is output B

    A

    END

    B

  10. REPLACE EGR PIPE WITH COOLER SUB-ASSEMBLY


    1. Replace the EGR pipe with cooler sub-assembly.

      Tech Tips


      • Click here

      • 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.

        Click here

      Result
      Proceed to
      NEXT

    NEXT

  11. 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.


      Powertrain > Engine > Clear DTCs

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

      Result
      Proceed to
      NEXT

    NEXT

  12. 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.


      Powertrain > Engine > Trouble Codes
      OK
      DTCs are not output.
      Result
      Proceed to
      NEXT

    NEXT

    END

  13. 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.


      Powertrain > Engine > Clear DTCs

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

      Result
      Proceed to
      NEXT

    NEXT

  14. 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.


      Powertrain > Engine > Trouble Codes
      Result
      Result Proceed to
      DTCs are not output A
      P04019C is output B

    A

    END

    B

    REPLACE EGR VALVE ASSEMBLY Click here Perform "Inspection After Repair" after replacing the EGR valve assembly. Click here