ECD SYSTEM (w/ EGR Cooler), 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

  • Open or short in E-VRV circuit

  • ECM
P0490

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

(1 trip detection logic)

  • E-VRV

  • Open or short in E-VRV circuit

  • ECM

WIRING DIAGRAM

A01DZHHE04

INSPECTION PROCEDURE

Note

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

PROCEDURE


  1. INSPECT VACUUM REGULATING VALVE (E-VRV)


    1. Inspect the vacuum regulating valve (E-VRV) Click here.


    NG

    REPLACE VACUUM REGULATING VALVE (E-VRV) Click here

    OK

  2. INSPECT VACUUM REGULATING VALVE (E-VRV) (POWER SOURCE VOLTAGE)


    1. A01E1KUE01

      Disconnect the V1 vacuum regulating valve (E-VRV) connector.

    2. Turn the ignition switch 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 (VACUUM REGULATING VALVE (E-VRV) - INTEGRATION RELAY) Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (VACUUM REGULATING VALVE (E-VRV) - ECM)


    1. A01E0DSE01

      Disconnect the V1 vacuum regulating valve (E-VRV) connector.

    2. Disconnect the E7 ECM connector.

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

      Standard resistance (Check for open)
      Tester Connection Specified Condition
      V1-2 - EGR (E7-9) Below 1 Ω
      Standard resistance (Check for short)
      Tester Connection Specified Condition
      V1-2 or EGR (E7-9) - Body ground 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

    REPLACE ECM Click here

  4. CHECK HARNESS AND CONNECTOR (VACUUM REGULATING VALVE (E-VRV) - INTEGRATION RELAY)

    A01DYZDE01

    1. Remove the integration relay from the engine room junction block Click here.

    2. Disconnect the 1J integration relay connector.

    3. Disconnect the V1 vacuum regulating valve (E-VRV) connector.

    4. Measure the resistance of the wire harness side connectors.

      Standard resistance (Check for open)
      Tester Connection Specified Condition
      1J-5 - V1-1 Below 1 Ω
      Standard resistance (Check for short)
      Tester Connection Specified Condition
      1J-5 - V1-1 Below 1 Ω
      1J-5 or V1-1 - Body ground 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

    INSPECT ECM POWER SOURCE CIRCUIT Click here