СИСТЕМА ECD, Diagnostic DTC:P0489, P0490

DTC Code DTC Name
P0489 Exhaust Gas Recirculation Control Circuit Low
P0490 Exhaust Gas Recirculation Control Circuit High

DESCRIPTION

The EGR actuator is operated by the ECM and opens and closes the EGR valve using gears. The opening angle of the EGR valve is detected by the EGR position sensor, which is mounted on the electric EGR control valve assembly.

P0489
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Idle the engine for 5 seconds or more

Both of the following conditions are met for 2.0 seconds:

(1 trip detection logic)


  • The EGR actuator duty cycle is 80% or higher.

  • EGR actuator current is below 0.5 A.

  • Open or short in EGR actuator circuit

  • Electric EGR control valve assembly

  • ECM
P0490
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Idle the engine for 5 seconds or more

An EGR actuator current of 8 A or higher or the ECM internal circuit temperature of 150 to 160°C (302 to 320°F) or higher is detected.

(1 trip detection logic)

  • Open or short in EGR actuator circuit

  • Electric EGR control valve assembly

  • ECM
Related Data List
DTC No. Data List

P0489

P0490

  • Actual EGR Valve Pos

  • Target EGR Valve Pos

WIRING DIAGRAM

Refer to DTC P042E Click here.

INSPECTION PROCEDURE

Note

After replacing the ECM, the new ECM needs registration Click here and initialization Click here.

Tech Tips

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. INSPECT ELECTRIC EGR CONTROL VALVE ASSEMBLY


    1. Remove the electric EGR control valve assembly Click here.

    2. A003ED5E02
      Text in Illustration
      *a

      Component without harness connected

      (Electric EGR Control Valve Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      5 - 4 Always No short or no open circuit

    NG

    REPLACE ELECTRIC EGR VALVE ASSEMBLY Click here

    OK

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


    1. Disconnect the electric 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
      D123-4 (M+) - D134-50 (EGM+) Always Below 1 Ω
      D123-5 (M-) - D134-20 (EGM-) Always Below 1 Ω
      D123-4 (M+) or D134-50 (EGM+) - Body ground and other terminals Always 10 kΩ or higher
      D123-5 (M-) or D134-20 (EGM-) - Body ground and other terminals Always 10 kΩ or higher

    4. Reconnect the electric EGR valve assembly connector.

    5. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  3. REPLACE ECM


    1. Replace the ECM Click here.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  4. REPLACE ELECTRIC EGR VALVE ASSEMBLY


    1. Replace the electric EGR valve assembly Click here.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  5. REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the harness or connector.


    NEXT

  6. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the GTS to the DLC3.

    2. Clear the DTCs Click here.

    3. Turn the ignition switch off for 30 seconds or more.

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

    5. Start the engine.

    6. Idle the engine for 5 seconds or more

    7. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

    8. Confirm that the DTC is not output again.


    NEXT

    END