Dtc P0405 Exhaust Gas Recirculation Sensor A Circuit Low

Lexus IS250 IS220d GSE20 ALE20 2AD-FHV ENGINE CONTROL SYSTEM

DESCRIPTION

MONITOR DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK EGR VALVE POSITION SENSOR POWER SOURCE

INSPECT EGR VALVE POSITION SENSOR

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

DTC P0405 Exhaust Gas Recirculation Sensor "A" Circuit Low

DTC 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 ConditionTrouble 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
  • HINT:
After confirming DTCs P0405 and P0406, check the EGR valve opening angle condition by entering the following menus on the intelligent tester: Powertrain / Engine / Data List / EGR Position.
The result values below are for when the engine switch is ON (IG) (engine is stopped), or when the engine is fully warmed-up and idling.
ResultCondition
Changes between 0.3 V and 4.2 VNormal
Less than 0.1 VP0405 (Low input voltage)
More than 4.9 VP0406 (High input voltage)

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.


Dtc P0405 Exhaust Gas Recirculation Sensor A Circuit Low. 2AD-FHV ENGINE CONTROL SYSTEM. Lexus IS250 IS220d GSE20 ALE20

WIRING DIAGRAM

Dtc P0405 Exhaust Gas Recirculation Sensor A Circuit Low. 2AD-FHV ENGINE CONTROL SYSTEM. Lexus IS250 IS220d GSE20 ALE20

INSPECTION PROCEDURE

  • NOTICE:
  • After replacing the ECM, the new ECM needs registration and initialization .
1.CHECK EGR VALVE POSITION SENSOR POWER SOURCE
Dtc P0405 Exhaust Gas Recirculation Sensor A Circuit Low. 2AD-FHV ENGINE CONTROL SYSTEM. Lexus IS250 IS220d GSE20 ALE20

Disconnect the E64 sensor connector.

Measure the voltage of the wire harness side connector.

  • Standard voltage:
  • Tester ConnectionSpecified Condition
    VC (E64-3) - E2 (E64-2)4.5 to 5.5 V
NG
Go to step 3
OK
2.INSPECT EGR VALVE POSITION SENSOR

Check the EGR valve position sensor .

  • Standard resistance:
  • Tester ConnectionEGR Valve ConditionConditionSpecified Condition
    VC (3) - E2 (2)-20°C (68°F)3.5 to 6.5 kΩ
    EGLS (4) - E2 (2)Fully opened20°C (68°F)3.9 kΩ
    EGLS (4) - E2 (2)Fully closed20°C (68°F)1.0 kΩ
NG
REPLACE EGR VALVE ASSEMBLY
OK
3.CHECK HARNESS AND CONNECTOR (EGR VALVE POSITION SENSOR - ECM)
Dtc P0405 Exhaust Gas Recirculation Sensor A Circuit Low. 2AD-FHV ENGINE CONTROL SYSTEM. Lexus IS250 IS220d GSE20 ALE20

Disconnect the E64 sensor connector.

Disconnect the E59 ECM connector.

Measure the resistance of the wire harness side connectors.

  • Standard resistance:
  • Tester ConnectionSpecified Condition
    VC (E64-3) - VCEG (E59-72)Below 1 Ω
    EGLS (E64-4) - EGLS (E59-118)Below 1 Ω
    E2 (E64-2) - EEGL (E59-95)Below 1 Ω
    EGLS (E64-4) or EGLS (E59-118) - Body ground10 kΩ or higher
    VC (E64-3) or VCEG (E59-72)- Body ground10 kΩ or higher
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
REPLACE ECM