Click here

ECD SYSTEM (w/ DPF), Diagnostic DTC:P0405, P0406, P0407, P0408

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
P0407 Exhaust Gas Recirculation Sensor "B" Circuit Low
P0408 Exhaust Gas Recirculation Sensor "B" Circuit High
Click here

DESCRIPTION

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

Table 1. P0405 (No. 1), P0407 (No. 2)
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 0.1 V for 5 seconds.

(1 trip detection logic)

  • Open in EGR valve position sensor circuit

  • EGR valve assembly (EGR valve position sensor)

  • ECM
Table 2. P0406 (No. 1), P0408 (No. 2)
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Engine switch on (IG) for 5 seconds

EGR valve position sensor output voltage is more than 4.9 V for 5 seconds.

(1 trip detection logic)

  • Short in EGR valve position sensor circuit

  • EGR 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

Click here

INSPECTION PROCEDURE

Note:

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

  • 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).

Tip:

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.

Click here

PROCEDURE


  1. Click here

    CHECK HARNESS AND CONNECTOR (EGR VALVE POSITION SENSOR - ECM)


    1. Disconnect the No. 1 or No. 2 EGR valve assembly connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance
      Table 3. No. 1 (LHD)
      Tester Connection Condition Specified Condition
      C87-3 (VC) - C45-91 (VC) Always Below 1 Ω
      C87-4 (EGLS) - C45-88 (EGLS) Always Below 1 Ω
      C87-2 (E2) - C45-92 (E2) Always Below 1 Ω
      C87-3 (VC) or C45-91 (VC) - Body ground Always 10 kΩ or higher
      C87-4 (EGLS) or C45-88 (EGLS) - Body ground Always 10 kΩ or higher
      Table 4. No. 2 (LHD)
      Tester Connection Condition Specified Condition
      C88-3 (VC) - C45-91 (VC) Always Below 1 Ω
      C88-4 (EGS2) - C45-89 (EGS2) Always Below 1 Ω
      C88-2 (E2) - C45-92 (E2) Always Below 1 Ω
      C88-3 (VC) or C45-91 (VC) - Body ground Always 10 kΩ or higher
      C88-4 (EGS2) or C45-89 (EGS2) - Body ground Always 10 kΩ or higher
      Table 5. No. 1 (RHD)
      Tester Connection Condition Specified Condition
      C87-3 (VC) - C46-91 (VC) Always Below 1 Ω
      C87-4 (EGLS) - C46-88 (EGLS) Always Below 1 Ω
      C87-2 (E2) - C46-92 (E2) Always Below 1 Ω
      C87-3 (VC) or C46-91 (VC) - Body ground Always 10 kΩ or higher
      C87-4 (EGLS) or C46-88 (EGLS) - Body ground Always 10 kΩ or higher
      Table 6. No. 2 (RHD)
      Tester Connection Condition Specified Condition
      C88-3 (VC) - C46-91 (VC) Always Below 1 Ω
      C88-4 (EGS2) - C46-89 (EGS2) Always Below 1 Ω
      C88-2 (E2) - C46-92 (E2) Always Below 1 Ω
      C88-3 (VC) or C46-91 (VC) - Body ground Always 10 kΩ or higher
      C88-4 (EGS2) or C46-89 (EGS2) - Body ground Always 10 kΩ or higher

  2. Click here

    CHECK ECM TERMINAL VOLTAGE (VC TERMINAL)


    1. A015BKQE09

      Disconnect the No. 1 or No. 2 EGR valve assembly connector.

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

      Standard Voltage
      Table 7. No. 1
      Tester Connection Switch Condition Specified Condition
      C87-3 (VC) - C87-2 (E2) Engine switch on (IG) 4.5 to 5.5 V
      Table 8. No. 2
      Tester Connection Switch Condition Specified Condition
      C88-3 (VC) - C88-2 (E2) Engine switch on (IG) 4.5 to 5.5 V
      Table 9. Text in Illustration
      *A No. 1
      *B No. 2
      *a

      Front view of wire harness connector

      (to EGR valve assembly)

  3. Click here

    REPLACE EGR VALVE ASSEMBLY

    When DTC P0405 or P0406 is output:


    • Replace the No. 1 EGR valve assembly (Click here).

    When DTC P0407 or P0408 is output:


    • Replace the No. 2 EGR valve assembly (Click here).


  4. Click here

    REPLACE ECM


    1. Replace the ECM (Click here).


  5. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the harness or connector.


  6. Click here

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the GTS to the DLC3.

    2. Clear the DTCs (Click here).

    3. Turn the engine switch off.

    4. Turn the engine switch on (IG) for 5 seconds.

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

    6. Confirm that the DTC is not output again.


  7. Click here

    END