ECD SYSTEM (w/ DPF), 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 electric EGR control valve assembly using gears. The opening angle of the electric EGR control valve assembly is detected by the EGR position sensor, which is mounted on the EGR body.

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

The EGR actuator current is below 0.5 A for 2.0 seconds during EGR valve operation.

(1 trip detection logic).

  • Open or short in electric EGR control valve assembly 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 due to a mechanical malfunction, or a Hall IC temperature of 150 to 160°C (302 to 320°F) or higher is detected.

(1 trip detection logic):

  • Open or short in electric EGR control valve assembly circuit

  • Electric EGR control valve assembly

  • ECM
Related Data List
DTC No. Data List
P0489

  • Actual EGR Valve Pos.

  • Target EGR Position
P0490

WIRING DIAGRAM

Refer to DTC P0405 Click here.

INSPECTION PROCEDURE

Note


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

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

  • After replacing the fuel supply pump assembly or suction control valve, the ECM needs initialization Click here.

  • After replacing an injector assembly, the ECM needs registration Click here.

Tech Tips

Read freeze frame data using the intelligent tester. 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. Inspect the electric EGR control valve assembly Click here.


    NG

    REPLACE ELECTRIC EGR CONTROL VALVE ASSEMBLY Click here

    OK

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


    1. Disconnect the electric EGR control 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
      E23-5 (M+) - E10-6 (EGM+) Always Below 1 Ω
      E23-4 (M-) - E10-7 (EGM-) Always Below 1 Ω
      E23-5 (M+) or E10-6 (EGM+) - Body ground Always 10 kΩ or higher
      E23-4 (M-) or E10-7 (EGM-) - Body ground Always 10 kΩ or higher

    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 CONTROL VALVE ASSEMBLY


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

    2. Perform Initialization procedure for electric EGR control 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 intelligent tester to the DLC3.

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

    3. Clear the DTCs Click here.

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

    5. Start the engine.

    6. Idle the engine for 5 seconds or more

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

    8. Confirm that the DTC is not output again.


    NEXT

    END