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 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 times or more

  • Open in EGR valve position sensor circuit

  • EGR valve

  • ECM
P0406 Short in EGR valve position sensor circuit for 5 times or more

  • Short in EGR valve position sensor circuit

  • EGR valve

  • ECM

WIRING DIAGRAM

Refer to DTC P0400 Click here.

INSPECTION PROCEDURE

Note

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

PROCEDURE


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


    1. A01CIS0E01

      Disconnect the EGR valve connector.

    2. Turn the ignition switch to the ON position.

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

      Standard voltage
      Tester Connection Condition Specified Condition
      E17-3 (VC) - E17-2 (E2) Ignition switch in the ON position 4.5 to 5.5 V

    4. Reconnect the EGR valve connector.


    NG

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

    OK

  2. INSPECT EGR VALVE ASSEMBLY (POSITION SENSOR RESISTANCE)


    1. A01CH6PE01

      Disconnect the EGR valve connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      E17-3 (VC) - E17-2 (E2) 20°C (68°F) 2.45 to 4.55 kΩ
      E17-4 (EGLS) - E17-2 (E2) 20°C (68°F) 2.45 to 4.55 kΩ

    3. Reconnect the EGR valve connector.


    NG

    REPLACE EGR VALVE ASSEMBLY

    OK

  3. CHECK ECM (EGLS VOLTAGE)


    1. A01CGXCE73

      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

    OK

    REPLACE ECM

    NG

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


    1. A01CJBAE01

      Disconnect the EGR valve position sensor.

    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
      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 connector.

    5. Reconnect the ECM connector.


    NG

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

    OK

    REPLACE ECM

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


    1. A01CIKHE01

      Disconnect the EGR valve 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
      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 connector.

    5. Reconnect the ECM connector.


    NG

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

    OK

    REPLACE ECM