ECD SYSTEM(w/ Glow Plug Controller), Diagnostic DTC:P0489 and 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
Table 1. 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

Tip:

  • 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

    CHECK WHETHER DTC OUTPUT RECURS (DTC P0489 OR P0490)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 CONNECTORClick 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

    REPLACE ECMClick here

    NG

  4. REPLACE ELECTRIC EGR CONTROL VALVE ASSEMBLY

    1. Replace the electric EGR control valve assembly.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

    CHECK WHETHER DTC OUTPUT RECURS (DTC P0489 OR P0490)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