ECD SYSTEM, Diagnostic DTC:P0405 and 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 electric EGR control valve assembly 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 position sensor (built into electric EGR control valve assembly)

  • 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 position sensor (built into electric EGR control valve assembly)

  • 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).

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.

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 CONNECTORClick here

    OK

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

    1. A204592C02

      *a

      Front view of wire harness connector

      (to Electric EGR Control 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 ECMClick 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. Turn the GTS on.

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

    9. Confirm that the DTC is not output.

      Powertrain > Engine > Trouble Codes

      OK

      DTC is not output.

    Result

    Proceed to

    OK

    NG
    OK

    END

    NG

    REPLACE ECMClick here

  5. REPLACE ECM

    1. Replace the ECM.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIREDClick 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. Turn the GTS on.

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

    9. Confirm that the DTC is not output.

      Powertrain > Engine > Trouble Codes

    Result

    Proceed to

    NEXT
    NEXT

    END