ECD SYSTEM, Diagnostic DTC:P1450

DTC Code DTC Name
P1450 Fault Path for EGR Valve Long Time Drift

DESCRIPTION

Refer to P0401 Click here.

Tech Tips

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

DTC No. DTC Detection Condition Trouble Area
P1450

When difference between first EGR valve learning value and current learning value exceeds threshold

(3 trip detection logic)

  • EGR valve position sensor (EGR valve assembly)

  • Open or short in EGR valve position sensor (EGR valve assembly) circuit

  • Vacuum switching valve Assembly

  • EGR cooler bypass switching valve assembly

  • Vacuum system

  • Vacuum hose

  • EGR valve assembly

  • EGR cooler assembly

  • ECM
Related Data List
DTC No. Data List
P1450

  • First Learnt Offset-Value of EGR Valve

  • Last Learnt Offset-Value of EGR Valve

WIRING DIAGRAM

A01IR66E54

INSPECTION PROCEDURE

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.

  • 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. READ VALUE USING GTS (FIRST LEARNT OFFSET-VALUE OF EGR VALVE AND LAST LEARNT OFFSET-VALUE OF EGR VALVE)


    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 / First Learnt Offset-Value of EGR Valve and Last Learnt Offset-Value of EGR Valve.

    4. Read the value.

      OK
      Deviation value should be less than 10%.

      Tech Tips

      EGR value is operated correctly if there is no difference among the above values.


    OK

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

    NG

    CHECK HARNESS AND CONNECTOR (EGR VALVE ASSEMBLY - ECM) Click here

  2. CHECK HARNESS AND CONNECTOR (EGR VALVE ASSEMBLY - ECM)


    1. Disconnect the EGR valve assembly connector.

    2. Disconnect the ECM connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      C87-1 (VC) - C84-69 (VCEG) Always Below 1 Ω
      C87-3 (EGLS) - C84-116 (EGLS) Always Below 1 Ω
      C87-2 (E2) - C84-84 (EEGL) Always Below 1 Ω
      C87-1 (VC) or C84-69 (VCEG) - Body ground Always 10 kΩ or higher
      C87-3 (EGLS) or C84-116 (EGLS) - Body ground Always 10 kΩ or higher
      C87-2 (E2) or C84-84 (EEGL) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (VC VOLTAGE)


    1. Disconnect the EGR valve assembly connector.

    2. Turn the ignition switch to ON.

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      C87-1 (VC) - C87-2 (E2) Ignition switch ON 4.5 to 5.5 V

    NG

    REPLACE ECM Click here

    OK

  4. CHECK VACUUM SYSTEM


    1. Check that there are no leaks in the vacuum system and the hoses are securely connected.

      OK
      No leaks and hoses are securely connected.

    NG

    REPAIR OR REPLACE VACUUM SYSTEM Click here

    OK

  5. 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

  6. INSPECT EGR COOLER ASSEMBLY


    1. Inspect the EGR cooler assembly Click here.


    NG

    REPLACE EGR COOLER ASSEMBLY Click here

    OK

  7. INSPECT VACUUM SWITCHING VALVE ASSEMBLY


    1. Inspect the vacuum switching valve assembly Click here.


    NG

    REPLACE VACUUM SWITCHING VALVE ASSEMBLY Click here

    OK

  8. INSPECT EGR VALVE ASSEMBLY


    1. Inspect the EGR valve assembly Click here.


    NG

    REPLACE EGR VALVE ASSEMBLY Click here

    OK

  9. CHECK VACUUM HOSE


    1. Check the vacuum hose for twists or cracks.

      OK
      No twists or cracks.

    NG

    REPAIR OR REPLACE VACUUM HOSE Click here

    OK

  10. REPLACE EGR VALVE ASSEMBLY


    1. Replace the EGR valve assembly Click here.

    2. Perform EGR learning value reset Click here.


    NEXT

  11. CHECK WHETHER DTC OUTPUT RECURS (DTC P1450)


    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. Read the DTCs.

      Result
      Result Proceed to
      No DTC output A
      DTC P1450 B

    B

    REPLACE ECM Click here

    A

    END

  12. REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the harness or connector.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  13. REPAIR OR REPLACE VACUUM SYSTEM


    1. Repair or replace the vacuum system.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  14. REPLACE EGR COOLER BYPASS SWITCHING VALVE ASSEMBLY


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


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  15. REPLACE EGR COOLER ASSEMBLY


    1. Replace the EGR cooler assembly Click here.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  16. REPLACE VACUUM SWITCHING VALVE ASSEMBLY


    1. Replace the vacuum switching valve assembly Click here.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  17. REPLACE EGR VALVE ASSEMBLY


    1. Replace the EGR valve assembly Click here.

    2. Perform EGR learning value reset Click here.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  18. REPAIR OR REPLACE VACUUM HOSE


    1. Repair or replace the vacuum hose.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  19. REPLACE ECM


    1. Replace the ECM Click here.


    NEXT

  20. 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