ECD SYSTEM (w/ EGR Cooler), 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 5 seconds, the ECM interprets this as a malfunction of the sensor circuit, and illuminates the MIL.

WIRING DIAGRAM

A01DX9ME03

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. A01E2N6E03

      Disconnect the E2 EGR valve position sensor connector.

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

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

    NG

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

    OK

  2. INSPECT EGR VALVE POSITION SENSOR

    A01DY1UE02

    1. Disconnect the EGR valve position sensor connector.

    2. Measure the resistance of the EGR valve position sensor.

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

    NG

    REPLACE EGR VALVE POSITION SENSOR Click here

    OK

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


    1. A01DZDDE03

      Disconnect the E2 EGR valve position sensor connector.

    2. Disconnect the E7 and E8 ECM connectors.

    3. Measure the resistance of the wire harness side connectors.

      Standard resistance (Check for open)
      Tester Connection Specified Condition
      VC (E2-1) - VC (E8-18) Below 1 Ω
      EGLS (E2-3) - EGLS (E7-33) Below 1 Ω
      E2 (E2-2) - E2 (E8-28) Below 1 Ω
      Standard resistance (Check for short)
      Tester Connection Specified Condition
      EGLS (E2-3) or EGLS (E7-33) - Body ground 10 kΩ or higher
      VC (E2-1) or VC (E8-18) - Body ground 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM Click here