SFI SYSTEM, Diagnostic DTC:P0403

DTC Code DTC Name
P0403 Exhaust Gas Recirculation Control Circuit

DESCRIPTION

Refer to DTC P0401 Click here.

DTC No. DTC Detection Condition Trouble Area
P0403 Open or short in EGR valve circuit (1 trip detection logic).

  • Open or short in EGR valve assembly circuit

  • EGR valve assembly

  • ECM

Tech Tips

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

MONITOR DESCRIPTION

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

Example:


MONITOR STRATEGY

Related DTCs P0403: EGR valve circuit range check
Required Sensors/Components (Main) EGR valve assembly
Required Sensors/Components (Related) -
Frequency of Operation Continuous
Duration -
MIL Operation Immediate
Sequence of Operation None

TYPICAL ENABLING CONDITIONS

Monitor runs whenever the following DTCs are not stored None
Engine Running
Auxiliary battery voltage 10.5 V or higher
Time after power switch off to on (IG) 0.5 seconds or more

TYPICAL MALFUNCTION THRESHOLDS

One of the following conditions is met Conditions A, B, C or D
A. All of the following conditions are met -
EGR1 output terminal voltage Low
Either of the following conditions is met 1 or 2
1. Step motor Driving
2. EGR1 Not operating
B. All of the following conditions are met -
EGR2 output terminal voltage Low
Either of the following conditions is met 3 or 4
3. Step motor Driving
4. EGR2 Not operating
C. All of the following conditions are met -
EGR3 output terminal voltage Low
Either of the following conditions is met 5 or 6
5. Step motor Driving
6. EGR3 Not operating
D. All of the following conditions are met -
EGR4 output terminal voltage Low
Either of the following conditions is met 7 or 8
7. Step motor Driving
8. EGR4 Not operating

CONFIRMATION DRIVING PATTERN

A01HTXOE08

  1. Connect the Techstream to the DLC3.

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

    Techstream 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 has a normal.

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

  14. If the judgment result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and check for permanent DTCs Click here.

    Tech Tips


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

    • If no permanent DTC is output, the system is normal.

WIRING DIAGRAM

A01HSYVE01

INSPECTION PROCEDURE

Note

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

Tech Tips

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


    1. Connect the Techstream to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the Techstream 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 / Primary / Throttle Idle Position and MAP.

    7. 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.

      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.

      • Do not open the EGR valve 30 steps or more during the Active Test.

      OK
      MAP and idling condition 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 30 Steps

      Idling condition

      (Throttle Idle Position: ON)

      		 Steady idling Idling changes from steady to rough idling or engine stalls

      MAP

      (Data List)

      MAP value is 20 to 40 kPa(abs) [150 to 300 mmHg(abs)]

      (EGR valve is fully closed)

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

      Tech Tips

      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.


    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. A01HTS3E15
      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 Condition Specified Condition
      E24-2 (+B1) - Body ground Power switch on (IG) 11 to 14 V
      E24-5 (+B2) - Body ground Power switch on (IG) 11 to 14 V

    NG

    CHECK HARNESS AND CONNECTOR (EGR VALVE ASSEMBLY - NO. 1 INTEGRATION RELAY) 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
      E24-4 (EGR1) - E28-28 (EGR1) Always Below 1 Ω
      E24-3 (EGR2) - E28-27 (EGR2) Always Below 1 Ω
      E24-6 (EGR3) - E28-26 (EGR3) Always Below 1 Ω
      E24-1 (EGR4) - E28-25 (EGR4) Always Below 1 Ω
      E24-4 (EGR1) or E28-28 (EGR1) - Body ground Always 10 kΩ or higher
      E24-3 (EGR2) or E28-27 (EGR2) - Body ground Always 10 kΩ or higher
      E24-6 (EGR3) or E28-26 (EGR3) - Body ground Always 10 kΩ or higher
      E24-1 (EGR4) or E28-25 (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 (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 and junction block assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E24-2 (+B1) - 1A-8 Always Below 1 Ω
      E24-5 (+B2) - 1A-8 Always Below 1 Ω
      E24-2 (+B1) or 1A-8 - Body ground Always 10 kΩ or higher
      E24-5 (+B2) or 1A-8 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE NO. 1 INTEGRATION RELAY Click here