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ECD SYSTEM (w/o DPF), Diagnostic DTC:P0405, P0406, P0407, P0408

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DTC Code DTC Name
P0405 Exhaust Gas Recirculation Sensor "A" Circuit Low
P0406 Exhaust Gas Recirculation Sensor "A" Circuit High
P0407 Exhaust Gas Recirculation Sensor "B" Circuit Low
P0408 Exhaust Gas Recirculation Sensor "B" Circuit High
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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.

Table 1. P0405
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Ignition switch ON for 5 seconds No. 1 EGR valve position sensor output voltage is less than 0.1 V for 5 seconds (1 trip detection logic).

  • Open in No. 1 EGR valve position sensor circuit

  • No. 1 EGR valve (EGR valve position sensor)

  • ECM
Table 2. P0406
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Ignition switch ON for 5 seconds No. 1 EGR valve position sensor output voltage is more than 4.9 V for 5 seconds (1 trip detection logic).

  • Short in No. 1 EGR valve position sensor circuit

  • No. 1 EGR valve (EGR valve position sensor)

  • ECM
Table 3. P0407
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Ignition switch ON for 5 seconds No. 2 EGR valve position sensor output voltage is less than 0.1 V for 5 seconds (1 trip detection logic).

  • Open in No. 2 EGR valve position sensor circuit

  • No. 2 EGR valve (EGR valve position sensor)

  • ECM
Table 4. P0408
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Ignition switch ON for 5 seconds No. 2 EGR valve position sensor output voltage is more than 4.9 V for 5 seconds (1 trip detection logic).

  • Short in No. 2 EGR valve position sensor circuit

  • No. 2 EGR valve (EGR valve position sensor)

  • ECM
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MONITOR DESCRIPTION

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 5 seconds, the ECM interprets this as a malfunction of the sensor circuit, and illuminates the MIL.

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WIRING DIAGRAM

Refer to DTC P0400 (Click here).

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INSPECTION PROCEDURE

Note:

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

Tip:

  • Read freeze frame data using the intelligent tester. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, and other data from the time the malfunction occurred.

  • Data List items "EGR Lift Sensor Volt %" and "EGR Lift Sensor Volt % #2" are values calculated by converting the EGR position sensor output voltage of 0 to 5 V to a percentage from 0 to 100%.

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PROCEDURE


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    CHECK HARNESS AND CONNECTOR (POWER SOURCE)


    1. A015BKQE08

      Disconnect the EGR valve connector.

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

      Standard Voltage
      Table 5. No. 1
      Tester Connection Switch Condition Specified Condition
      C87-3 (VC) - C87-2 (E2) Ignition switch ON 4.5 to 5.5 V
      Table 6. No. 2
      Tester Connection Switch Condition Specified Condition
      C88-3 (VC) - C88-2 (E2) Ignition switch ON 4.5 to 5.5 V

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    INSPECT EGR VALVE ASSEMBLY (No. 1 or No. 2) (POSITION SENSOR)


    1. Disconnect the EGR valve connector.

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

      Standard Resistance
      Table 7. No. 1
      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
      Table 8. No. 2
      Tester Connection Condition Specified Condition
      3 (VC) - 2 (E2) 20°C (68°F) 2.45 to 4.55 kΩ
      4 (EGS2) - 2 (E2) 20°C (68°F) 2.45 to 4.55 kΩ

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


    1. A0155ZXE08

      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)
      Table 9. No. 1 (LHD)
      Tester Connection Condition Specified Condition
      C87-3 (VC) - C45-90 (VCEG) Always Below 1 Ω
      C87-4 (EGLS) - C45-89 (EGLS) Always Below 1 Ω
      C87-2 (E2) - C45-87 (EEGL) Always Below 1 Ω
      Table 10. No. 2 (LHD)
      Tester Connection Condition Specified Condition
      C88-3 (VC) - C45-90 (VCEG) Always Below 1 Ω
      C88-4 (EGS2) - C45-88 (EGS2) Always Below 1 Ω
      C88-2 (E2) - C45-87 (EEGL) Always Below 1 Ω
      Table 11. No. 1 (RHD)
      Tester Connection Condition Specified Condition
      C87-3 (VC) - C46-90 (VCEG) Always Below 1 Ω
      C87-4 (EGLS) - C46-89 (EGLS) Always Below 1 Ω
      C87-2 (E2) - C46-87 (EEGL) Always Below 1 Ω
      Table 12. No. 2 (RHD)
      Tester Connection Condition Specified Condition
      C88-3 (VC) - C46-90 (VCEG) Always Below 1 Ω
      C88-4 (EGS2) - C46-88 (EGS2) Always Below 1 Ω
      C88-2 (E2) - C46-87 (EEGL) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Table 13. No. 1 (LHD)
      Tester Connection Condition Specified Condition
      C87-3 (VC) or C45-90 (VCEG) - Body ground Always 10 kΩ or higher
      C87-4 (EGLS) or C45-89 (EGLS) - Body ground Always 10 kΩ or higher
      Table 14. No. 2 (LHD)
      Tester Connection Condition Specified Condition
      C88-3 (VC) or C45-90 (VCEG) - Body ground Always 10 kΩ or higher
      C88-4 (EGS2) or C45-88 (EGS2) - Body ground Always 10 kΩ or higher
      Table 15. No. 1 (RHD)
      Tester Connection Condition Specified Condition
      C87-3 (VC) or C46-90 (VCEG) - Body ground Always 10 kΩ or higher
      C87-4 (EGLS) or C46-89 (EGLS) - Body ground Always 10 kΩ or higher
      Table 16. No. 2 (RHD)
      Tester Connection Condition Specified Condition
      C88-3 (VC) or C46-90 (VCEG) - Body ground Always 10 kΩ or higher
      C88-4 (EGS2) or C46-88 (EGS2) - Body ground Always 10 kΩ or higher

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    REPLACE ECM


    1. Replace the ECM (Click here).


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    REPLACE EGR VALVE ASSEMBLY (No. 1 or No. 2)


    1. Replace the EGR valve assembly (No. 1 or No. 2) (Click here).


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    REPAIR OR REPLACE HARNESS OR CONNECTOR


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    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the intelligent tester to the DLC3.

    2. Clear the DTCs (Click here).

    3. Turn the ignition switch off.

    4. Turn the ignition switch to ON for 5 seconds.

    5. Enter the following menus: Powertrain / Engine / DTC.

    6. Confirm that the DTC is not output again.


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    END