SFI SYSTEM, Diagnostic DTC:P0403

DTC Code DTC Name
P0403 Exhaust Gas Recirculation Control Circuit

DESCRIPTION

Refer to DTC P0400 Click here.

DTC No. DTC Detection Condition Trouble Area
P0403

Open or short in EGR valve circuit

(3 trip detection logic)

  • Open or short in EGR valve circuit

  • EGR valve assembly

  • ECM

Tech Tips

DTC P0403 is stored when the ignition switch is ON.

WIRING DIAGRAM

Refer to DTC P0400 Click here.

CAUTION / NOTICE / HINT

Note


  • Perform electronic throttle learning after replacing the ECM Click here.

  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

Tech Tips

Read freeze frame data using the intelligent tester. 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, 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 (CONTROL THE EGR STEP POSITION)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the tester on.

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

      Tech Tips

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

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

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

      OK
      MAP and idling condition change in response to EGR step position as follows.
      Standard
      EGR Step Position (Active Test)
      - 0 Step 0 to 30 Steps
      Idling condition Steady idling Idling changes from steady to rough idling

      MAP

      (Data List)

      MAP value is 28 to 48 kPa

      (210 to 360 mmHg)

      (EGR valve is fully closed)

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

      Tech Tips


      • 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.

      • During Active Test, if the idling condition does not change in response to EGR step position, then there is probably a malfunction in the EGR valve.


    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here

    NG

  2. INSPECT EGR VALVE ASSEMBLY


    1. Inspect the EGR valve assembly Click here.


    NG

    REPLACE EGR VALVE ASSEMBLY Click here

    OK

  3. CHECK TERMINAL VOLTAGE (EGR VALVE ASSEMBLY)

    A01VFW9E01
    Text in Illustration
    *a

    Front view of wire harness connector

    (to EGR Valve Assembly))

    1. Disconnect the EGR valve assembly connector.

    2. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      B56-2 (+B1) - Body ground Ignition switch ON 11 to 14 V
      B56-5 (+B2) - Body ground Ignition switch ON 11 to 14 V

    NG

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

    OK

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


    1. Disconnect the ECM connector.

    2. Disconnect the EGR valve assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B87-42 (EGR1) - B56-4 (EGR1) Always Below 1 Ω
      B87-64 (EGR2) - B56-3 (EGR2) Always Below 1 Ω
      B87-63 (EGR3) - B56-6 (EGR3) Always Below 1 Ω
      B87-43 (EGR4) - B56-1 (EGR4) Always Below 1 Ω
      B87-42 (EGR1) or B56-4 (EGR1) - Body ground Always 10 kΩ or higher
      B87-64 (EGR2) or B56-3 (EGR2) - Body ground Always 10 kΩ or higher
      B87-63 (EGR3) or B56-6 (EGR3) - Body ground Always 10 kΩ or higher
      B87-43 (EGR4) or B56-1 (EGR4) - Body ground Always 10 kΩ or higher

    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

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


    1. Disconnect the EGR valve assembly connector.

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B56-2 (+B1) - 1E-4 Always Below 1 Ω
      B56-5 (+B2) - 1E-4 Always Below 1 Ω
      B56-2 (+B1) or 1E-4 - Body ground Always 10 kΩ or higher
      B56-5 (+B2) or 1E-4 - Body ground Always 10 kΩ or higher

    OK

    CHECK ECM POWER SOURCE CIRCUIT Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR