Click here

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

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

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.

Table 1. P0405
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Engine switch on (IG) 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
Table 2. P0406
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Engine switch on (IG) 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
Click here

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.

Click here

WIRING DIAGRAM

Refer to DTC P042E (Click here).

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 (See PageClick here).

Tip:

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, and other data from the time the malfunction occurred.

Click here

PROCEDURE


  1. Click here

    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 (Check for Open)
      Tester Connection Condition Specified Condition
      C127-3 (VC) - C91-13 (VCPX) Always Below 1 Ω
      C127-2 (VTA) - C90-1 (EGRA) Always Below 1 Ω
      C127-1 (E2) - C90-7 (EEGL) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      C127-3 (VC) or C91-13 (VCPX) - Body ground Always 10 kΩ or higher
      C127-2 (VTA) or C90-1 (EGRA) - Body ground Always 10 kΩ or higher

    4. Reconnect the electric EGR control valve assembly connector.

    5. Reconnect the ECM connector.


  2. Click here

    CHECK HARNESS AND CONNECTOR (POWER SOURCE)


    1. A01DU82E03

      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
      C127-3 (VC) - C127-1 (E2) Engine switch on (IG) 4.5 to 5.5 V
      Table 3. Text in Illustration
      *a

      Front view of wire harness connector

      (to Electric EGR Valve Assembly)

    3. Reconnect the electric EGR control valve assembly connector.


  3. Click here

    REPLACE ELECTRIC EGR CONTROL VALVE ASSEMBLY


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


  4. Click here

    CHECK WHETHER DTC OUTPUT RECURS (P0405 OR P0406)


    1. Connect the intelligent tester to the DLC3.

    2. Clear the DTCs (Click here).

    3. Turn the engine switch on (IG) for 5 seconds or more.

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

    5. Confirm that the DTC is not output again.

      OK
      DTC is not output again.

  5. Click here

    END

  6. Click here

    REPLACE ECM


    1. Replace the ECM (Click here).


  7. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the harness or connector.


  8. Click here

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the intelligent tester to the DLC3.

    2. Clear the DTCs (Click here).

    3. Turn the engine switch on (IG) for 5 seconds or more.

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

    5. Confirm that the DTC is not output again.


  9. Click here

    END