ECD SYSTEM (w/o EGR Cooler Bypass Valve), 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

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

(1 trip detection logic)

  • Open or short in EGR valve position sensor circuit

  • EGR valve position sensor

  • ECM
P0406

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

(1 trip detection logic)

  • Open or short in EGR valve position sensor circuit

  • EGR valve position sensor

  • ECM

MONITOR DESCRIPTION

When output voltage of the EGR valve position sensor deviates from the normal operating range of 0.1 to 4.9 V for more than 0.5 seconds, the ECM interprets this as a malfunction of the sensor circuit, and illuminates the MIL.

A01KG88E09

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.

Tech Tips

Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, and other data from the time the malfunction occurred.

PROCEDURE


  1. CHECK TERMINAL VOLTAGE (EGR VALVE POSITION SENSOR CONNECTOR)


    1. A01KHLEE11
      Text in Illustration
      *1 EGR Valve Position Sensor Connector
      *a Wire Harness Side
      *b Front View

      Disconnect the E1 EGR valve position sensor connector.

    2. Turn the ignition switch ON.

    3. Measure the voltage of the wire harness side connector.

      Standard voltage
      Tester Connection Specified Condition
      E1-1 (VC) - E1-2 (E2) 4.5 to 5.5 V

    4. Reconnect the EGR valve position sensor connector.


    NG

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

    OK

  2. INSPECT EGR VALVE POSITION SENSOR


    1. A01KHN0E12
      Text in Illustration
      *1 Ohmmeter

      Disconnect the EGR valve position sensor connector.

    2. Create a vacuum in the diaphram chamber.

    3. Measure the resistance of the EGR valve position sensor when the valve is fully opened and fully closed.

      Standard resistance
      Tester Connection EGR Valve Condition Condition Specified Condition
      3 (EGLS) - 2 (E2) Fully opened 20°C (68°F) 2.0 to 7.0 kΩ
      3 (EGLS) - 2 (E2) Fully closed 20°C (68°F) 0.1 to 2.5 kΩ

    4. Reconnect the EGR valve position sensor connector.


    NG

    REPLACE EGR VALVE POSITION SENSOR

    OK

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


    1. A01KI28E09
      Text in Illustration
      *1 EGR Valve Position Sensor Connector
      *2 ECM Connector
      *a Wire Harness Side
      *b Front View

      Disconnect the E1 EGR valve position sensor connector.

    2. Disconnect the E5 and E6 ECM connectors.

    3. Check the resistance.

      Standard resistance (Check for open)
      Tester Connection Specified Condition
      E1-3 (EGLS) - E5-33 (EGLS) Below 1 Ω
      E2 (E1-2) - E2 (E6-28) Below 1 Ω
      Standard resistance (Check for short)
      Tester Connection Specified Condition
      E1-3 (EGLS) or E5-33 (EGLS)- Body ground 10 kΩ or higher

    4. Reconnect the EGR valve position sensor connector.

    5. Reconnect the ECM connectors.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM