SFI SYSTEM(w/ EGR System), Diagnostic DTC:P0403

DTC Code DTC Name
P0403 Exhaust Gas Recirculation Control Circuit

DESCRIPTION

Refer to DTC P0401.

Click here

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Warning Indicate

Memory

P0403

Exhaust Gas Recirculation Control Circuit

Open or short in the EGR valve circuit (1 trip detection logic).

  • Open or short in EGR valve circuit

  • EGR valve assembly

  • ECM

Comes on

DTC stored
Tip:

DTC P0403 is stored when the engine switch is on (IG).

MONITOR DESCRIPTION

This DTC is designed to detect an open or short is the EGR valve circuit.

If the EGR terminal voltage is low when the EGR terminal output is off, the ECM determines that the EGR valve circuit is malfunctioning.

MONITOR STRATEGY

Frequency of Operation

Continuous

CONFIRMATION DRIVING PATTERN

A215251E10

  1. Connect the intelligent tester to the DLC3.

  2. Turn the engine switch on (IG) and turn the tester on [A].

  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).

    Click here

  4. Start the engine and warm it up [B].

  5. Drive the vehicle at 20 km/h (12 mph) or more for 10 minutes [C].

    CAUTION:

    When performing the confirmation driving pattern, obey all speed limits and traffic laws.

  6. Enter the following menus: Powertrain / Engine and ECT / DTC [D].

  7. Read the pending DTCs.

    Tip:

    • If a pending DTC is output, the system is malfunctioning.

    • If a pending DTC is not output, perform the following procedure.

  8. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

  9. Input the DTC: P0403.

  10. Check the DTC judgment result.

    Tester Display

    Description

    NORMAL

    • DTC judgment completed

    • System normal

    ABNORMAL

    • DTC judgment completed

    • System abnormal

    INCOMPLETE

    • DTC judgment not completed

    • Perform driving pattern after confirming DTC enabling conditions

    UNKNOWN

    • Unable to perform DTC judgment

    • Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit
    Tip:

    • If the judgment result shows NORMAL, the system is normal.

    • If the judgment result shows ABNORMAL, the system has a malfunction.

WIRING DIAGRAM

Refer to DTC P0401.

Click here

CAUTION / NOTICE / HINT

Tip:

Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE

  1. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (OPERATE EGR VALVE)

    1. Connect the intelligent tester to the DLC3.

    2. Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher.

      Tip:

      • When performing the Active Test, make sure the shift lever is in P or N.

      • The A/C switch and all accessory switches should be off.

    3. Turn the tester on.

    4. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position.

      Powertrain > Engine and ECT > Active Test

      Tester Display

      Control the EGR Step Position

    5. Confirm that Throttle Idle Position is ON and check the engine idling condition and the value of MAP in the Data List while performing the Active Test.

      Tip:

      • Do not leave the EGR valve open for 10 seconds or more during the Active Test.

      • Be sure to return the EGR valve to step 0 when the Active Test is completed.

      OK

      MAP and idling condition change in response to EGR step position as follows.

      Standard

      -

      EGR Step Position (Active Test)

      Step 0

      Step 0 to 30

      Idling condition

      Steady idling

      Idling changes from steady to rough idling or engine stalls

      MAP

      (Data List)

      20 to 40 kPa (150 to 300 mmHg)

      MAP value is at least 10 kPa (75 mmHg) higher than when EGR valve is fully closed

      Result

      Result

      OK

      NG
    OK

    CHECK FOR INTERMITTENT PROBLEMS

    Click here

    NG

  2. INSPECT EGR VALVE ASSEMBLY

    1. Inspect the EGR valve assembly.

      Click here

      Result

      Result

      OK

      NG
    NG

    REPLACE EGR VALVE ASSEMBLY

    Click here

    OK

  3. INSPECT EGR VALVE ASSEMBLY (+B OR +B2 VOLTAGE)

    1. A217947C01

      *a

      Front view of wire harness connector

      (to EGR Valve Assembly)

      Disconnect the EGR valve connector.

    2. Measure the voltage according to the value(s) in the table below.

      Standard Resistance

      Tester Connection

      Switch Condition

      Specified Condition

      C43-5 (+B1) - Body ground

      Engine switch on (IG)

      11 to 14 V

      C43-2 (+B2) - Body ground

      Engine switch on (IG)

      11 to 14 V

    3. Reconnect the EGR valve connector.

      Result

      Result

      OK

      NG
    NG

    CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - EGR VALVE)Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (ECM - EGR VALVE)

    1. Disconnect the EGR valve connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance (Check for Open)

      Tester Connection

      Condition

      Specified Condition

      C28-23 (EGR1) - C43-4 (EGR1)

      Always

      Below 1 Ω

      C28-36 (EGR2) - C43-3 (EGR2)

      Always

      Below 1 Ω

      C28-30 (EGR3) - C43-6 (EGR3)

      Always

      Below 1 Ω

      C28-24 (EGR4) - C43-1 (EGR4)

      Always

      Below 1 Ω

      Standard Resistance (Check for Short)

      Tester Connection

      Condition

      Specified Condition

      C28-23 (EGR1) or C43-4 (EGR1) - Body ground

      Always

      Below 1 Ω

      C28-36 (EGR2) or C43-3 (EGR2) - Body ground

      Always

      Below 1 Ω

      C28-30 (EGR3) or C43-6 (EGR3) - Body ground

      Always

      Below 1 Ω

      C28-24 (EGR4) or C43-1 (EGR4) - Body ground

      Always

      Below 1 Ω

    4. Reconnect the EGR valve connector.

    5. Reconnect the ECM connector.

      Result

      Result

      OK

      NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK WHETHER DTC OUTPUT RECURS (DTC P0403)

    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Clear the DTCs.

      Click here

      Powertrain > Engine and ECT > Clear DTCs

    4. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

    5. Confirm that no DTC is output using the intelligent tester.

      Powertrain > Engine and ECT > Trouble Codes

      Result

      Result

      Proceed to

      DTC P0403 output

      A

      No DTC output

      B
    A

    REPLACE ECM

    Click here

    B

    END

  6. CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - EGR VALVE)

    1. Disconnect the EGR valve connector.

    2. Remove the No. 1 integration relay from engine room relay block.

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

      Standard Resistance (Check for Open)

      Tester Connection

      Condition

      Specified Condition

      1B-4 - C43-5 (+B1)

      Always

      Below 1 Ω

      1B-4 - C43-2 (+B2)

      Always

      Below 1 Ω

      Standard Resistance (Check for Short)

      Tester Connection

      Condition

      Specified Condition

      1B-4 or C43-5 (+B1) - Body ground

      Always

      Below 1 Ω

      1B-4 or C43-2 (+B2) - Body ground

      Always

      Below 1 Ω

    4. Reconnect the EGR valve connector.

    5. Reinstall the No. 1 integration relay.

      Result

      Result

      OK

      NG
    OK

    CHECK ECM POWER SOURCE CIRCUIT

    Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR