ECD SYSTEM, Diagnostic DTC:P0403,P0404,P0489 and P0490

DTC Code DTC Name
P0403 Exhaust Gas Recirculation "A" Control Circuit
P0404 Exhaust Gas Recirculation "A" Control Circuit Range / Performance
P0489 Exhaust Gas Recirculation "A" Control Circuit Low
P0490 Exhaust Gas Recirculation "A" Control Circuit High

DESCRIPTION

Refer to DTC P0401.

Click here

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

P0403

Exhaust Gas Recirculation "A" Control Circuit

Open or short in EGR valve circuit for 0.22 seconds.

(3 trip detection logic)

  • Open or short in EGR valve circuit

  • EGR valve assembly

  • ECM

Comes on

DTC stored

P0404

Exhaust Gas Recirculation "A" Control Circuit Range / Performance

Either condition is met (3 trip detection logic):

  • EGR valve circuit overcurrent for 0.22 seconds.

  • EGR valve sensor circuit over temperature for 0.22 seconds.

  • Battery short in EGR valve circuit for 0.22 seconds.

  • Open or short in EGR valve circuit

  • EGR valve assembly

  • Cooling fan system

  • ECM

Comes on

DTC stored

P0489

Exhaust Gas Recirculation "A" Control Circuit Low

Ground short in EGR valve circuit for 0.22 seconds.

(3 trip detection logic)

  • Open or short in EGR valve circuit

  • EGR valve assembly

  • ECM

Comes on

DTC stored

P0490

Exhaust Gas Recirculation "A" Control Circuit High

Battery short in EGR valve circuit for 0.22 seconds.

(3 trip detection logic)

  • Open or short in EGR valve circuit

  • EGR valve assembly

  • ECM

Comes on

DTC stored
Table 1. Related Data Lis

DTC No.

Data List

P0403

P0404

P0489

P0490

  • Actual EGR Valve Pos

  • Target EGR Valve Pos

WIRING DIAGRAM

Refer to DTC P0405.

Click here

CAUTION / NOTICE / HINT

Note:

  • When replacing the ECM, the ECM needs registration and initialization.

    Click here

  • After replacing the EGR valve assembly, the ECM needs initialization.

    Click here

PROCEDURE

  1. INSPECT EGR VALVE ASSEMBLY

    1. Inspect the EGR valve assembly.

      Click here

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE EGR VALVE ASSEMBLYClick here

    OK

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

    1. Disconnect the EGR 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

      B131-2 (M+) - B112-48 (EGM+)

      Always

      Below 1 Ω

      B131-1 (M-) - B112-18 (EGM-)

      Always

      Below 1 Ω

      B131-2 (M+) or B112-48 (EGM+) - Body ground

      Always

      10 kΩ or higher

      B131-1 (M-) or B112-18 (EGM-) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTORClick here

    OK

  3. REPLACE ECM

    1. Replace the ECM.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIREDClick here

  4. REPAIR OR REPLACE HARNESS OR CONNECTOR

    1. Repair or replace the harness or connector.

    Result

    Proceed to

    NEXT
    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIREDClick here

  5. REPLACE EGR VALVE ASSEMBLY

    1. Replace the EGR valve assembly.

      Click here

    2. Perform the EGR learning value reset.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

  6. 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 60 seconds or more [A].

    5. Perform road test [B].

    6. Repeat [A] and [B] for the number of trips detected.

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

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

      Powertrain > Engine and ECT > Trouble Codes

    9. Confirm that the DTC is not output again.

    Result

    Proceed to

    NEXT
    NEXT

    END