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

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

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.

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
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

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

A01WT2JE04

CAUTION / NOTICE / HINT

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 (See page ) 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 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
      No. 1 (LHD)
      Tester Connection Condition Specified Condition
      C97-3 (VC) - C110-91 (VC) Always Below 1 Ω
      C97-4 (EGLS) - C110-88 (EGLS) Always Below 1 Ω
      C97-2 (E2) - C110-92 (E2) Always Below 1 Ω
      C97-3 (VC) or C110-91 (VC) - Body ground Always 10 kΩ or higher
      C97-4 (EGLS) or C110-88 (EGLS) - Body ground Always 10 kΩ or higher
      No. 2 (LHD)
      Tester Connection Condition Specified Condition
      C98-3 (VC) - C110-91 (VC) Always Below 1 Ω
      C98-4 (EGS2) - C110-89 (EGS2) Always Below 1 Ω
      C98-2 (E2) - C110-92 (E2) Always Below 1 Ω
      C98-3 (VC) or C110-91 (VC) - Body ground Always 10 kΩ or higher
      C98-4 (EGS2) or C110-89 (EGS2) - Body ground Always 10 kΩ or higher
      No. 1 (RHD)
      Tester Connection Condition Specified Condition
      C97-3 (VC) - C138-91 (VC) Always Below 1 Ω
      C97-4 (EGLS) - C138-88 (EGLS) Always Below 1 Ω
      C97-2 (E2) - C138-92 (E2) Always Below 1 Ω
      C97-3 (VC) or C138-91 (VC) - Body ground Always 10 kΩ or higher
      C97-4 (EGLS) or C138-88 (EGLS) - Body ground Always 10 kΩ or higher
      No. 2 (RHD)
      Tester Connection Condition Specified Condition
      C98-3 (VC) - C138-91 (VC) Always Below 1 Ω
      C98-4 (EGS2) - C138-89 (EGS2) Always Below 1 Ω
      C98-2 (E2) - C138-92 (E2) Always Below 1 Ω
      C98-3 (VC) or C138-91 (VC) - Body ground Always 10 kΩ or higher
      C98-4 (EGS2) or C138-89 (EGS2) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  2. CHECK ECM TERMINAL VOLTAGE (VC TERMINAL)


    1. A01WQ8EE02
      Text in Illustration
      *A No. 1
      *B No. 2
      *a

      Front view of wire harness connector

      (to EGR valve assembly)

      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
      No. 1
      Tester Connection Switch Condition Specified Condition
      C97-3 (VC) - C97-2 (E2) Engine switch on (IG) 4.5 to 5.5 V
      No. 2
      Tester Connection Switch Condition Specified Condition
      C98-3 (VC) - C98-2 (E2) Engine switch on (IG) 4.5 to 5.5 V

    NG

    REPLACE ECM Click here

    OK

  3. 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.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  4. REPLACE ECM


    1. Replace the ECM Click here.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  5. REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the harness or connector.


    NEXT

  6. 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.


    NEXT

    END