ECD SYSTEM, Diagnostic DTC:P0402

DTC Code DTC Name
P0402 Exhaust Gas Recirculation "A" Flow Excessive Detected

DESCRIPTION

Refer to DTC P0401.

Click here

Tech Tips

For more information on the EGR control, refer to System Description.

Click here

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P0402 Exhaust Gas Recirculation "A" Flow Excessive Detected

During normal operation, EGR positive deviation exceeds limit value, or EGR rate exceeds limit value for 5 seconds.

(1 trip detection logic)

  • Intake system air leak

  • Air cleaner filter element sub-assembly

  • Diesel throttle body assembly

  • Mass air flow meter sub-assembly

  • EGR valve assembly

  • Turbocharger sub-assembly

  • Swirl Control Valve

  • ECM

 Comes on DTC stored

CAUTION / NOTICE / HINT

Note


  • When replacing the ECM, the ECM needs registration and initialization.

    Click here

  • After replacing the EGR valve assembly, the ECM needs initialization.

    Click here

  • After replacing the mass air flow meter sub-assembly, 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 INTAKE SYSTEM


    1. Check for air leaks in the intake system from the mass air flow meter sub-assembly to the turbocharger sub-assembly.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE INTAKE SYSTEM Click here

    OK

  2. CHECK AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY


    1. Inspect the air cleaner filter element sub-assembly.

      OK
      No blockage in air cleaner filter element sub-assembly.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY Click here

    OK

  3. CHECK MASS AIR FLOW METER SUB-ASSEMBLY


    1. Check for DTCs related to the mass air flow meter sub-assembly.

      OK
      DTCs related to the mass air flow meter sub-assembly are not output.
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE MASS AIR FLOW METER SUB-ASSEMBLY Click here

    OK

  4. CHECK SWIRL CONTROL VALVE


    1. Check that the swirl control valve is not stuck closed or blocked.

      OK
      Swirl control valve is moving correctly and not stuck closed or blocked.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE SWIRL CONTROL VALVE Click here

    OK

  5. CHECK DIESEL THROTTLE BODY ASSEMBLY


    1. Check for DTCs related to the diesel throttle body assembly.

      OK
      DTCs related to the diesel throttle body assembly are not output.
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE DIESEL THROTTLE BODY ASSEMBLY Click here

    OK

  6. CHECK EGR VALVE ASSEMBLY


    1. Check for DTCs related to the EGR valve assembly.

      OK
      DTCs related to the EGR valve assembly are not output.
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE EGR VALVE ASSEMBLY Click here

    OK

  7. CHECK TURBOCHARGER SUB-ASSEMBLY


    1. Check for DTCs related to the turbocharger sub-assembly.

      OK
      DTCs related to the turbocharger sub-assembly are not output.
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE TURBOCHARGER SUB-ASSEMBLY Click here

    OK

  8. CHECK WHETHER DTC OUTPUT RECURS (DTC P0402)


    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 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.


      Powertrain > Engine and ECT > Trouble Codes

    8. Read the DTCs.

      Result
      Result Proceed to
      No DTC output A
      DTC P0402 B

    A

    END

    B

  9. REPLACE ECM


    1. Replace the ECM.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 17 Click here

  10. REPAIR OR REPLACE TURBOCHARGER SUB-ASSEMBLY


    1. Repair or replace turbocharger sub-assembly or perform inspections and troubleshooting for related DTCs.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 17 Click here

  11. REPAIR OR REPLACE EGR VALVE ASSEMBLY


    1. Repair or replace EGR valve assembly or perform inspections and troubleshooting for related DTCs.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 17 Click here

  12. REPAIR OR REPLACE DIESEL THROTTLE BODY ASSEMBLY


    1. Repair or replace diesel throttle body assembly or perform inspections and troubleshooting for related DTCs.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 17 Click here

  13. REPLACE SWIRL CONTROL VALVE


    1. Replace the swirl control valve.

      Click here

    2. Perform the swirl valve learning value reset.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 17 Click here

  14. REPAIR OR REPLACE MASS AIR FLOW METER SUB-ASSEMBLY


    1. Repair or replace mass air flow meter sub-assembly or perform inspections and troubleshooting for related DTCs.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 17 Click here

  15. REPLACE AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY


    1. Replace the air cleaner element assembly.

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 17 Click here

  16. REPAIR OR REPLACE INTAKE SYSTEM


    1. Repair or replace the malfunctioning parts of the intake system.

      Result
      Proceed to
      NEXT

    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.


      Powertrain > Engine and ECT > Clear DTCs

    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.


      Powertrain > Engine and ECT > Trouble Codes

    8. Confirm that the DTC is not output again.

      Result
      Proceed to
      NEXT

    NEXT

    END