ECD SYSTEM (w/ EGR Cooler Bypass Valve), 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 system recirculates exhaust gases, in order to suit every driving condition. The recirculated gas mingles with intake air, therefore the EGR system can slow combustion speed and keep the combustion temperature down. This helps reduce NOx emission.

In order to increase EGR circulation efficiency, the ECM adjusts the lift amount of the EGR valve and throttle valve angle.

DTC No. DTC Detection Condition Trouble Area
P0489

Open or short in E-VRV circuit for 5 seconds or more

(1 trip detection logic)

  • E-VRV for EGR

  • Open or short in E-VRV for EGR circuit

  • ECM
P0490

Open or short in E-VRV circuit for 5 seconds or more

(1 trip detection logic)

  • E-VRV for EGR

  • Open or short in E-VRV for EGR circuit

  • ECM

WIRING DIAGRAM

Refer to DTC P0400 Click here.

INSPECTION PROCEDURE

Note

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

PROCEDURE


  1. INSPECT ELECTRIC EGR CONTROL VALVE ASSEMBLY (E-VRV FOR EGR)


    1. Inspect the E-VRV for EGR Click here.


    NG

    REPLACE VACUUM REGULATING VALVE (E-VRV) Click here

    OK

  2. INSPECT ELECTRIC EGR CONTROL VALVE ASSEMBLY (E-VRV FOR EGR) (POWER SOURCE VOLTAGE)


    1. A01KIF3E14
      Text in Illustration
      *1 E-VRV for EGR Connector
      *a Wire Harness Side

      Disconnect the V1 E-VRV for EGR connector.

    2. Turn the ignition switch to ON.

    3. Measure the voltage of the wire harness side connector and body ground.

      Standard voltage
      Tester Connection Specified Condition
      V1-1 - Body ground 11 to 14 V

    NG

    CHECK HARNESS AND CONNECTOR (E-VRV FOR EGR - EFI MAIN RELAY) Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (E-VRV FOR EGR - ECM)


    1. Disconnect the V1 E-VRV for EGR connector.

    2. Disconnect the E10 ECM connector.

    3. Measure the resistance of the wire harness side connector.

      Standard resistance (Check for open)
      Tester Connection Specified Condition
      V1-2 - E10-9 (EGR) Below 1 Ω
      Standard resistance (Check for short)
      Tester Connection Specified Condition
      V1-2 or E10-9 (EGR) - Body ground 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

    REPLACE ECM Click here

  4. CHECK HARNESS AND CONNECTOR (E-VRV FOR EGR - EFI MAIN RELAY)

    A01KGC9E05
    Text in Illustration
    *1 EFI Fuse
    *2 EFI MAIN relay
    *3 E-VRV for EGR Connector
    *a R/B No. 2
    *b Wire Harness Side
    *c Front View

    1. Inspect the EFI fuse.


      1. Remove the EFI fuse from the R/B No. 2.

      2. Check the EFI fuse resistance.

        Standard resistance
        Below 1 Ω

      3. Reinstall the EFI fuse.

    2. Check the wire harness between the E-VRV for EGR and EFI MAIN relay.


      1. Disconnect the V1 E-VRV for EGR connector.

      2. Remove the EFI MAIN relay from the R/B No. 2.

    3. Check the resistance.

      Standard resistance (Check for open)
      Tester Connection Specified Condition
      R/B No. 2 (EFI MAIN relay terminal 3) - V1-1 Below 1 Ω
      Standard resistance (Check for short)
      Tester Connection Specified Condition
      R/B No. 2 (EFI MAIN relay terminal 3) or V1-1 - Body ground 10 kΩ or higher

    4. Reconnect the E-VRV for EGR connector.

    5. Reinstall the EFI MAIN relay.


    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

    INSPECT ECM POWER SOURCE CIRCUIT Click here