ECD SYSTEM(w/ Urea SCR System), 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.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P0489 Exhaust Gas Recirculation Control Circuit Low

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

 Comes on DTC stored
P0490 Exhaust Gas Recirculation Control Circuit High

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 assembly circuit

  • Electric EGR control valve assembly

  • ECM

 Comes on DTC stored
Related Data List
DTC No. Data List

P0489

P0490

  • Actual EGR Valve Pos

  • Target EGR Valve Pos

CONFIRMATION DRIVING PATTERN

DTC No. DTC Detection Drive Pattern

P0489

P0490

 Idle the engine for 5 seconds or more

WIRING DIAGRAM

Refer to DTC P042E.

Click here

CAUTION / NOTICE / HINT

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 (RESISTANCE OF EGR ACTUATOR)


    1. Remove the electric EGR control valve assembly.

      Click here

    2. B0027B5C01
      *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 (M-) - 4 (M+) Always No short or open circuit
      Result
      Proceed to
      OK
      NG

    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
      C95-4 (M+) - C59-6 (EGM+) Always Below 1 Ω
      C95-5 (M-) - C59-7 (EGM-) Always Below 1 Ω
      C95-4 (M+) or C59-6 (EGM+) - Body ground and other terminals Always 10 kΩ or higher
      C95-5 (M-) or C59-7 (EGM-) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  3. REPLACE ECM


    1. Replace the ECM.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 5 Click here

  4. REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the harness or connector.

      Result
      Proceed to
      NEXT

    NEXT

  5. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the GTS to the DLC3.

    2. Clear the DTCs.


      Powertrain > Engine > Clear DTCs

    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 / Trouble Codes.

    7. Confirm that the DTC is not output again.


      Powertrain > Engine > Trouble Codes
      Result
      Proceed to
      NEXT

    NEXT

    END

  6. REPLACE ELECTRIC EGR CONTROL VALVE ASSEMBLY


    1. Replace the electric EGR control valve assembly.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 5 Click here