ECD SYSTEM (w/o 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, and then the ECM regulates the lift amount of the valve in accordance with the engine running condition.

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

Tech Tips


  • After confirming DTCs P0405 and P0406, check the EGR valve opening angle condition.

    Result Condition
    Changes between 0.3 to 4.2 V Normal
    Less than 0.1 V P0405 (Low input voltage)
    More than 4.9 V P0406 (High input voltage)

  • The result values above are for when the ignition switch is ON (engine is stopped), or when the engine is fully warmed-up and idling.

MONITOR DESCRIPTION

A01DYWXE04

When the 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.

WIRING DIAGRAM

A01E2XNE01

INSPECTION PROCEDURE

Tech Tips

Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when a malfunction is detected. 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.

Note

If the ECM is replaced, the new ECM needs initialization Click here.

PROCEDURE


  1. CHECK ECM (VC VOLTAGE)

    A01DVZHE04

    1. Disconnect the E2 EGR valve position sensor connector.

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

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

    NG

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

    OK

  2. INSPECT EGR VALVE POSITION SENSOR (RESISTANCE)


    NG

    REPLACE EGR VALVE POSITION SENSOR

    OK

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

    A01DZK8E04

    1. Disconnect the E2 sensor connector.

    2. Disconnect the E7 and E8 ECM connectors.

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

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

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

    REPLACE ECM Click here