ECD SYSTEM(w/ Glow Plug Controller), Diagnostic DTC:P0403 and P0404

DTC Code DTC Name
P0403 Exhaust Gas Recirculation Circuit
P0404 Exhaust Gas Recirculation "A" Control Circuit Range / Performance

DESCRIPTION

Refer to DTC P0400.

Click here

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

P0403

Exhaust Gas Recirculation Circuit

Open or short in EGR valve circuit for around 1 second

(1 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

One of the following condition is met (2 trip detection logic):

  • EGR valve power stage over temperature for around 3 seconds.

  • Short circuit overload is detected in EGR valve power stage for around 3 seconds.

  • Open or short in EGR valve circuit

  • EGR valve assembly

  • ECM

Comes on

DTC stored
Table 1. DTC Detection Drive Pattern

DTC No.

DTC Detection Drive Pattern

P0403

Ignition switch ON (not engine start)

P0404

Engine runnning
Table 2. Related Data List

DTC No.

Data List

P0403

  • Actual EGR Valve Pos

  • Target EGR Valve Pos

P0404

WIRING DIAGRAM

A353791E03

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. INSPECT ELECTRIC EGR CONTROL VALVE ASSEMBLY (DC MOTOR)

    1. Inspect the electric EGR control valve assembly.

      Click here

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE ELECTRIC EGR CONTROL VALVE ASSEMBLYClick 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

      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. 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

    Result

    Proceed to

    NEXT
    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIREDClick here

  5. REPLACE ELECTRIC EGR CONTROL VALVE ASSEMBLY

    1. Replace the electric EGR control valve assembly.

      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 / Trouble Codes / Pending.

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

      Powertrain > Engine and ECT > Trouble Codes

    Result

    Proceed to

    NEXT
    NEXT

    END