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 EGR valve using gears. The opening angle of the EGR valve 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 Valve Pos

P0490

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.

  • After replacing the fuel supply pump assembly, 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 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. Inspect the electric EGR control valve assembly Click here.


    NG
    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
      s1-4 (M+) - D99-86 (EGM+) Always Below 1 Ω
      s1-5 (M-) - D99-85 (EGM-) Always Below 1 Ω
      s1-4 (M+) or D99-86 (EGM+) - Body ground Always 10 kΩ or higher
      s1-5 (M-) or D99-85 (EGM-) - Body ground Always 10 kΩ or higher
    4. Reconnect the electric EGR valve assembly connector.

    5. Reconnect the ECM connector.


    NG
    OK
  3. REPLACE ECM


    1. Replace the ECM Click here.


    NEXT
  4. REPLACE ELECTRIC EGR VALVE ASSEMBLY


    1. Replace the electric EGR valve assembly Click here.


    NEXT
  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. Start the engine.

    5. Idle the engine for 5 seconds or more

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

    7. Confirm that the DTC is not output again.


    NEXT