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

DTC Code DTC Name
P0403 Exhaust Gas Recirculation Circuit Malfunction

DESCRIPTION

Refer to DTC P0401 Click here.

DTC No. DTC Detection Condition Trouble Area
P0403

Both of the following conditions are met: (1 trip detection logic)


  • (a) The engine is running.

  • (b) Any of the terminals EGR1 to EGR4 has a fixed voltage of 0 V.

  • Open or short in EGR valve assembly circuit

  • EGR valve assembly

  • No. 1 integration relay

  • ECM

MONITOR DESCRIPTION

This DTC is stored if an open or short in the EGR valve assembly circuit is detected.

Example:


MONITOR STRATEGY

Frequency of Operation Continuous

CONFIRMATION DRIVING PATTERN

Tech Tips

Performing this confirmation driving pattern will activate the catalyst efficiency monitor. This is very useful for verifying the completion of a repair.

A01FRDTE13

  1. Connect the GTS to the DLC3.

  2. Turn the power switch on (IG) and turn the GTS on.

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

  4. Turn the power switch off and wait for at least 30 seconds.

  5. Turn the power switch on (IG) and turn the GTS on [A].

  6. Put the engine in inspection mode (maintenance mode) Click here.

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

  8. 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.

  9. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [D].

  10. Read the pending DTCs.

    Tech Tips


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

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

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

  12. Input the DTC: P0403.

  13. Check the DTC judgment result.

    GTS 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
    N/A

    • Unable to perform DTC judgment

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

    Tech Tips


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

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

WIRING DIAGRAM

A01FTI5E01

INSPECTION PROCEDURE

Note

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

Tech Tips

Read freeze frame data using the GTS. 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 GTS (CONTROL THE EGR STEP POSITION)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Put the engine in inspection mode (maintenance mode) Click here.

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

      Tech Tips

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

    6. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position / Data List / All Data / Throttle Idle Position and MAP.

    7. Confirm that the Throttle Idle Position is ON and check the MAP value in the Data List while performing the Active Test.

      Note


      • 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.

      • Do not open the EGR valve 26 steps or more during the Active Test.

      OK
      MAP change in response to EGR step position when Throttle Idle Position is ON in Data List.
      Standard
      - EGR Step Position (Active Test)
      0 Steps 0 to 26 Steps

      MAP

      (Data List)

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

      Tech Tips


      • While performing the Active Test, if the increase in the value of MAP is small, the EGR valve assembly may be a malfunctioning.

      • Even if the EGR valve assembly is malfunctioning, rough idling or an increase in the value of MAP may occur while performing the Active Test. However, the amount that the value of MAP increases will be smaller than normal.


    NG

    INSPECT EGR VALVE ASSEMBLY Click here

    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here

  2. INSPECT EGR VALVE ASSEMBLY


    1. Inspect the EGR valve assembly Click here.

      Tech Tips

      Perform "Inspection After Repair" after replacing the EGR valve assembly Click here.


    NG

    REPLACE EGR VALVE ASSEMBLY Click here

    OK

  3. CHECK TERMINAL VOLTAGE (POWER SOURCE OF EGR VALVE ASSEMBLY)


    1. A01FQP4E22
      Text in Illustration
      *a

      Front view of wire harness connector

      (to EGR Valve Assembly)

      Disconnect the EGR valve assembly connector.

    2. Turn the power switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      F84-2 (+B1) - Body ground Power switch on (IG) 11 to 14 V
      F84-5 (+B2) - Body ground Power switch on (IG) 11 to 14 V

    NG

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

    OK

  4. 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
      F84-4 (EGR1) - F70-28 (EGR1) Always Below 1 Ω
      F84-3 (EGR2) - F70-27 (EGR2) Always Below 1 Ω
      F84-6 (EGR3) - F70-26 (EGR3) Always Below 1 Ω
      F84-1 (EGR4) - F70-25 (EGR4) Always Below 1 Ω
      F84-4 (EGR1) or F70-28 (EGR1) - Body ground Always 10 kΩ or higher
      F84-3 (EGR2) or F70-27 (EGR2) - Body ground Always 10 kΩ or higher
      F84-6 (EGR3) or F70-26 (EGR3) - Body ground Always 10 kΩ or higher
      F84-1 (EGR4) or F70-25 (EGR4) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM Click here

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


    1. Disconnect the EGR valve assembly connector.

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1E-15 - F84-2 (+B1) Always Below 1 Ω
      1E-15 - F84-5 (+B2) Always Below 1 Ω
      1E-15 or F84-2 (+B1) - Body ground Always 10 kΩ or higher
      1E-15 or F84-5 (+B2) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE NO.1 INTEGRATION RELAY