ECD SYSTEM (w/ DPF), Diagnostic DTC:P0405, P0406

DTC Code DTC Name
P0405 Exhaust Gas Recirculation Sensor "A" Circuit Low
P0406 Exhaust Gas Recirculation Sensor "A" Circuit High

DESCRIPTION

The EGR valve position sensor is mounted on the EGR valve and used for detecting the EGR valve angle. The EGR valve angle detected by the sensor is sent to the ECM as feedback. The ECM then regulates the EGR valve angle in accordance with engine running conditions.

P0405
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Ignition switch ON for 5 seconds

EGR valve position sensor output voltage is less than 0.2 V for 2 seconds.

(1 trip detection logic)

  • Open or short in EGR valve position sensor circuit

  • Electric EGR control valve assembly (EGR valve position sensor)

  • ECM
P0406
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Ignition switch ON for 5 seconds

EGR valve position sensor output voltage is higher than 4.8 V for 2 seconds.

(1 trip detection logic)

  • Open or short in EGR valve position sensor circuit

  • Electric EGR control valve assembly (EGR valve position sensor)

  • ECM

MONITOR DESCRIPTION

When the output voltage of the EGR valve position sensor deviates from the normal operating range of 0.1 to 4.9 V for more than 5 seconds, the ECM interprets this as a malfunction of the sensor circuit and illuminates the MIL.

WIRING DIAGRAM

Refer to DTC P042E Click here.

INSPECTION PROCEDURE

Note


  • After replacing the ECM, the new ECM needs registration Click here and initialization Click here.

  • After replacing the fuel supply pump assembly, the ECM needs initialization Click here.

  • After replacing an injector assembly, the ECM needs registration Click here.

Tech Tips

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. CHECK HARNESS AND CONNECTOR (EGR VALVE POSITION SENSOR - 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
      s1-3 (VC) - D99-75 (VCPX) Always Below 1 Ω
      s1-2 (VTA) - D99-115 (EGRA) Always Below 1 Ω
      s1-1 (E2) - D99-92 (EEGL) Always Below 1 Ω
      s1-3 (VC) or D99-75 (VCPX) - Body ground Always 10 kΩ or higher
      s1-2 (VTA) or D99-115 (EGRA) - Body ground Always 10 kΩ or higher

    4. Reconnect the electric EGR control valve assembly connector.

    5. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (POWER SOURCE)


    1. A01BI0JE09
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Electric EGR control valve assembly)

      Disconnect the electric EGR control valve assembly connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      s1-3 (VC) - s1-1 (E2) Ignition switch ON 4.5 to 5.5 V

    3. Reconnect the electric EGR control valve assembly connector.


    NG

    REPLACE ECM Click here

    OK

  3. REPLACE ELECTRIC EGR CONTROL VALVE ASSEMBLY


    1. Replace the electric EGR control valve assembly Click here.


    NEXT

  4. CHECK WHETHER DTC OUTPUT RECURS (P0405 OR P0406)


    1. Connect the GTS to the DLC3.

    2. Clear the DTCs Click here.

    3. Turn the ignition switch to ON for 5 seconds or more.

    4. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

    5. Confirm that the DTC is not output again.

      OK
      DTC is not output again.

    NG

    REPLACE ECM Click here

    OK

    END

  5. REPLACE ECM


    1. Replace the ECM Click here.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  6. REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the harness or connector.


    NEXT

  7. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the GTS to the DLC3.

    2. Clear the DTCs Click here.

    3. Turn the ignition switch to ON for 5 seconds or more.

    4. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

    5. Confirm that the DTC is not output again.


    NEXT

    END