ECD SYSTEM, Diagnostic DTC:P1401

DTC Code DTC Name
P1401 Fault Code to Indicate a Defect of EGR Cooler Bypass Valve

DESCRIPTION

Refer to DTC P245A Click here.

DTC No. DTC Detection Condition Trouble Area
P1401

Even though EGR cooler bypass switching valve assembly operation conditions are met, temperature does not change after passing through EGR cooler.

(3 trip detection logic)

  • Vacuum system

  • EGR cooler bypass switching valve assembly

  • EGR cooler assembly
Related Data List
DTC No. Data List
P1401 EGR Cooler Bypass Valve

WIRING DIAGRAM

Refer to DTC P245A Click here.

CAUTION / NOTICE / HINT

Note


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

  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

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. PERFORM ACTIVE TEST USING GTS (ACTUATOR TEST OF EGR COOLER BYPASS VALVE)


    1. Connect the GTS to the DLC3.

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

    3. Start the engine.

    4. Preparation before test.


      1. Disconnect vacuum line on vacuum unit of EGR cooler bypass.

      2. Connect pressure gauge between vacuum line and vacuum unit.

    5. Enter the following menus: Powertrain / Engine and ECT / Active Test / Actuator Test of EGR Cooler Bypass Valve.

    6. Set the control value to 5%. The EGR cooler bypass valve must operate within 1 second. Valve travel when adjusted is approximately 10 mm.

    7. Check of vacuum system.


      1. Build up of vacuum: vacuum is 650 hPa or more within 1 second.

      2. Decrease of vacuum: vacuum is 0 to 50 hPa or less within 1 second.

    8. Wait for 2 seconds and set the control value to 95%. The EGR cooler bypass valve must operate within 1 second. Valve travel when adjusted is approximately 10 mm.

    9. Check of vacuum system.


      1. Build up of vacuum: vacuum is 650 hPa or more within 1 second.

      2. Decrease of vacuum: vacuum is 0 to 50 hPa or less within 1 second.

    10. Wait for 2 seconds and stop the operation using the EGR cooler bypass valve Active Test.

      OK
      Operates smoothly when above procedure is performed.

      Tech Tips

      Check the movement of the EGR cooler bypass valve (stiffness, interference with other parts, etc.).


    OK

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

    NG

  2. CHECK VACUUM SUPPLY


    1. Check that vacuum is supplied to the EGR cooler bypass switching valve assembly.


    NG

    REPAIR OR REPLACE VACUUM SUPPLY Click here

    OK

  3. INSPECT EGR COOLER BYPASS SWITCHING VALVE ASSEMBLY


    1. Inspect the EGR cooler bypass switching valve assembly Click here.


    NG

    REPLACE EGR COOLER BYPASS SWITCHING VALVE ASSEMBLY Click here

    OK

  4. REPLACE EGR COOLER ASSEMBLY


    1. Replace the EGR cooler assembly Click here.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  5. REPAIR OR REPLACE VACUUM SUPPLY


    1. Repair or replace the source of the vacuum supply failure.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  6. REPLACE EGR COOLER BYPASS SWITCHING VALVE ASSEMBLY


    1. Replace the EGR cooler bypass switching valve assembly Click here.


    NEXT

  7. 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

    END