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

P0489
DTC Detection Drive Pattern DTC Detection Condition Trouble Area

Turn the ignition switch to ON and wait for 10 seconds

(This DTC is monitored only once per driving cycle)

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
P0490
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Ignition switch ON for 30 seconds

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

WIRING DIAGRAM

Refer to DTC P0403 Click here.

CAUTION / NOTICE / HINT

Note

When replacing the ECM, the ECM needs Registration and Initialization 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 the new ECM, perform all of the initialization/registrations 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.

    3. Turn the GTS on.

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

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

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

    B

    CHECK WHETHER DTC OUTPUT RECURS (DTC P0489 OR P0490) Click here

    A

  2. CHECK HARNESS AND CONNECTOR (ELECTRIC EGR CONTROL VALVE ASSEMBLY - ECM)


    1. Disconnect the B55 electric EGR control valve assembly connector.

    2. Disconnect the B104 ECM connector (for LHD).

    3. Disconnect the B103 ECM connector (for RHD).

    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      B104-51 (EGM+) - B55-1 (M+) Always Below 1 Ω
      B104-21 (EGM-) - B55-2 (M-) Always Below 1 Ω
      B104-51 (EGM+) or B55-1 (M+) - Body ground Always 10 kΩ or higher
      B104-21 (EGM-) or B55-2 (M-) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      B103-51 (EGM+) - B55-1 (M+) Always Below 1 Ω
      B103-21 (EGM-) - B55-2 (M-) Always Below 1 Ω
      B103-51 (EGM+) or B55-1 (M+) - Body ground Always 10 kΩ or higher
      B103-21 (EGM-) or B55-2 (M-) - Body ground Always 10 kΩ or higher

    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.


    OK

    REPLACE ECM Click here

    NG

  4. REPLACE ELECTRIC EGR CONTROL VALVE ASSEMBLY


    1. Replace the electric EGR control valve assembly Click here.

    2. Turn the ignition switch to ON.

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


    NEXT

    CHECK WHETHER DTC OUTPUT RECURS (DTC P0489 OR P0490) Click here

  5. REPAIR OR REPLACE HARNESS OR CONNECTOR


    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.

    3. Turn the GTS on.

    4. Clear the DTCs Click here.

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

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

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

    8. Read the DTCs.

      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.


    NEXT

  8. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Clear the DTCs Click here.

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

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

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

    8. Confirm that the DTC is not output again.


    NEXT

    END