ECD SYSTEM, 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 assembly 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.

DTC No. DTC Detection Condition Trouble Area
P0405 Open in EGR valve position sensor circuit for 5 seconds

  • Open in EGR valve position sensor circuit

  • EGR valve assembly

  • ECM
P0406 Short in EGR valve position sensor circuit for 5 seconds

  • Short in EGR valve position sensor circuit

  • EGR valve assembly

  • ECM

WIRING DIAGRAM

A01CJ1PE04

INSPECTION PROCEDURE

Note

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

PROCEDURE


  1. CHECK EGR VALVE ASSEMBLY (EGR POSITION SENSOR POWER SOURCE)


    1. A01CIS0E05
      Text in Illustration
      *1

      Front view of wire harness connector

      (to EGR Valve Assembly)

      Disconnect the EGR 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 Switch Condition Specified Condition
      E17-3 (VC) - E17-2 (E2) Ignition switch ON 4.5 to 5.5 V

    4. Reconnect the EGR valve assembly connector.


    NG

    CHECK HARNESS AND CONNECTOR (ECM - EGR VALVE ASSEMBLY) Click here

    OK

  2. INSPECT EGR VALVE ASSEMBLY (EGR POSITION SENSOR RESISTANCE)


    1. A01CH6PE08
      Text in Illustration
      *1

      Component without harness connected

      (EGR Valve Assembly)

      Disconnect the EGR valve assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 (VC) - 2 (E2) 20°C (68°F) 2.45 to 4.55 kΩ
      4 (EGLS) - 2 (E2) 20°C (68°F) 2.45 to 4.55 kΩ

    3. Reconnect the EGR valve assembly connector.


    NG

    REPLACE EGR VALVE ASSEMBLY Click here

    OK

  3. CHECK ECM (EGLS VOLTAGE)


    1. A01CGXCE90
      Text in Illustration
      *1

      Component with harness connected

      (ECM)

      Start the engine.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      E23-33 (EGLS) - E22-28 (E2) Idling 3.0 to 3.5 V
      E23-33 (EGLS) - E22-28 (E2) Engine running at 3000 rpm 2.7 to 3.3 V

    NG

    CHECK HARNESS AND CONNECTOR (ECM - EGR VALVE ASSEMBLY) Click here

    OK

    REPLACE ECM Click here

  4. CHECK HARNESS AND CONNECTOR (ECM - EGR VALVE ASSEMBLY)


    1. Disconnect the EGR 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
      E23-33 (EGLS) - E17-4 (EGLS) Always Below 1 Ω
      E22-28 (E2) - E17-2 (E2) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      E23-33 (EGLS) or E17-4 (EGLS) - Body ground Always 10 kΩ or higher
      E22-28 (E2) or E17-2 (E2) - Body ground Always 10 kΩ or higher

    4. Reconnect the EGR valve assembly connector.

    5. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - EGR VALVE POSITION SENSOR)

    OK

    REPLACE ECM Click here

  5. CHECK HARNESS AND CONNECTOR (ECM - EGR VALVE ASSEMBLY)


    1. Disconnect the EGR 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
      E22-18 (VC) - E17-3 (VC) Always Below 1 Ω
      E22-28 (E2) - E17-2 (E2) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      E22-18 (VC) or E17-3 (VC) - Body ground Always 10 kΩ or higher
      E22-28 (E2) or E17-2 (E2) - Body ground Always 10 kΩ or higher

    4. Reconnect the EGR valve assembly connector.

    5. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - EGR VALVE ASSEMBLY)

    OK

    REPLACE ECM Click here