ECD SYSTEM(for CCo), 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.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P0405 Exhaust Gas Recirculation Sensor "A" Circuit Low

EGR valve position sensor output voltage is less than 0.1 V for 5 seconds.

(1 trip detection logic)

  • Open or short in EGR valve position sensor circuit

  • EGR valve assembly (EGR valve position sensor)

  • ECM

 Comes on DTC stored
P0406 Exhaust Gas Recirculation Sensor "A" Circuit High

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

(1 trip detection logic)

  • Open or short in EGR valve position sensor circuit

  • EGR valve assembly (EGR valve position sensor)

  • ECM

 Comes on DTC stored

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 higher than 5 seconds, the ECM interprets this as a malfunction of the sensor circuit and illuminates the MIL.

CONFIRMATION DRIVING PATTERN

DTC No. DTC Detection Drive Pattern
P0405 Ignition switch ON for 5 seconds or more
P0406

WIRING DIAGRAM

Refer to DTC P042E Click here.

CAUTION / NOTICE / HINT

Note

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

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
      i1-2 (VC) - B76-94 (VCEG) Always Below 1 Ω
      i1-4 (VTA) - B76-118 (EGLS) Always Below 1 Ω
      i1-3 (E2) - B76-95 (EEGL) Always Below 1 Ω
      i1-2 (VC) or B76-94 (VCEG) - Body ground Always 10 kΩ or higher
      i1-4 (VTA) or B76-118 (EGLS) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  2. CHECK TERMINAL VOLTAGE (POWER SOURCE OF ELECTRIC EGR CONTROL VALVE ASSEMBLY)


    1. A00YWWUC02
      *a

      Front view of wire harness connector

      (to Electric EGR Valve Assembly)

      Disconnect the electric EGR control valve assembly connector.

    2. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      i1-2 (VC) - i1-3 (E2) Ignition switch ON 4.5 to 5.5 V
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE ECM Click here

    OK

  3. REPLACE ELECTRIC EGR CONTROL VALVE ASSEMBLY


    1. Replace the electric EGR control valve assembly.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

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


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Clear the DTCs.


      Powertrain > Engine > Clear DTCs

    5. Turn the ignition switch off and wait for 30 seconds or more.

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

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


      Powertrain > Engine > Trouble Codes

    8. Confirm that the DTC is not output again.

      OK
      DTC is not output again.
      Result
      Proceed to
      OK
      NG

    OK

    END

    NG

  5. REPLACE ECM


    1. Replace the ECM.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 7 Click here

  6. REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the harness or connector.

      Result
      Proceed to
      NEXT

    NEXT

  7. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Clear the DTCs.


      Powertrain > Engine > Clear DTCs

    5. Turn the ignition switch off and wait for 30 seconds or more.

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

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


      Powertrain > Engine > Trouble Codes

    8. Confirm that the DTC is not output again.

      Result
      Proceed to
      NEXT

    NEXT

    END