ECD SYSTEM(w/ Glow Plug Controller), Diagnostic DTC:P0489, P0490

DTC Code DTC Name
P0489 Exhaust Gas Recirculation Control Circuit Low
P0490 Exhaust Gas Recirculation Control Circuit High

DESCRIPTION

The ECM opens and closes the EGR valve using a DC motor type actuator. Due to opening and closing the valve, the exhaust gas recirculation volume can be properly controlled.

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

Open in electric EGR control valve assembly circuit

(2 trip detection logic)

  • Electric EGR control valve assembly

  • Open in electric EGR control valve assembly circuit

  • ECM

 Comes on DTC stored
P0490 Exhaust Gas Recirculation Control Circuit High

Short in electric EGR control valve assembly circuit

(2 trip detection logic)

  • Electric EGR control valve assembly

  • Short in electric EGR control valve assembly circuit

  • ECM

 Comes on DTC stored
DTC Detection Drive Pattern
DTC No. DTC Detection Drive Pattern
P0489

Turn the ignition switch to ON and wait for 10 seconds

(Monitor this DTC only once per driving cycle)
P0490 Turn the ignition switch to ON and wait for 30 seconds

WIRING DIAGRAM

Refer to DTC P0403.

Click here

CAUTION / NOTICE / HINT

Note

When replacing the ECM, perform ECM Initialization and Registration.

Click here

Tech Tips


  • When the ECM must be replaced, before replacing the ECM, perform the "Learning Values Save" function using the GTS. Then after installing a new ECM, perform all of the initialization and registration procedures for the "Learning Values Write" function by following the instructions shown on the GTS display.

  • 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. PERFORM ACTIVE TEST USING GTS (CONTROL THE EGR STEP POSITION)


    1. Connect the GTS to the DLC3.

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

    3. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position / Data List / Actual EGR Valve Pos.


      Powertrain > Engine and ECT > Active Test
      Active Test Display
      Control the EGR Step Position
      Data List Display
      Actual EGR Valve Pos

    4. When changing the Active Test value from 1 to 100%, check that Actual EGR Valve Pos smoothly changes to the set opening angle.

      Standard
      Value smoothly changes to the set opening angle.
      Result
      Proceed to
      OK
      NG

    OK

    GO TO STEP 6 Click here

    NG

  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
      B134-1 (M+) - B212-51 (EGM+) Always Below 1 Ω
      B134-2 (M-) - B212-21 (EGM-) Always Below 1 Ω
      B134-1 (M+) or B212-51 (EGM+) - Body ground and other terminals Always 10 kΩ or higher
      B134-2 (M-) or B212-21 (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. INSPECT ELECTRIC EGR CONTROL VALVE ASSEMBLY (DC MOTOR)


    1. Inspect the electric EGR control valve assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    OK

    GO TO STEP 7 Click here

    NG

  4. REPLACE ELECTRIC EGR CONTROL VALVE ASSEMBLY


    1. Replace the electric EGR control valve assembly.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 6 Click here

  5. REPAIR OR REPLACE HARNESS OR CONNECTOR

    Result
    Proceed to
    NEXT

    NEXT

  6. CHECK WHETHER DTC OUTPUT RECURS (DTC P0489 OR P0490)


    1. Connect the GTS to the DLC3.

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

    3. Clear the DTCs.


      Powertrain > Engine and ECT > Clear DTCs

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

    5. Turn the ignition switch to ON and wait for 30 seconds or more.

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

    7. Read the pending DTCs.


      Powertrain > Engine and ECT > Trouble Codes
      Result
      Result Proceed to
      DTC P0489 or P0490 is output A
      DTC is not output B

    B

    END

    A

  7. REPLACE ECM


    1. Replace the ECM.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  8. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the GTS to the DLC3.

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

    3. Clear the DTCs.


      Powertrain > Engine and ECT > Clear DTCs

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

    5. Turn the ignition switch to ON and wait for 30 seconds or more.

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

    7. Confirm that the pending DTC is not output again.


      Powertrain > Engine and ECT > Trouble Codes
      Result
      Proceed to
      NEXT

    NEXT

    END