Dtc P0405 Exhaust Gas Recirculation Sensor A Circuit Low

Engine. Lexus Is250, Is220D. Gse20 Ale20
2Ad-Fhv Engine Control System. Lexus Is250, Is220D. Gse20 Ale20

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 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)
  1. Open or short in EGR valve position sensor circuit
  2. EGR valve position sensor
  3. ECM
P0406
EGR valve position sensor output voltage is more than 4.9 V for more than 5 seconds
(1 trip detection logic)
  1. Open or short in EGR valve position sensor circuit
  2. EGR valve position sensor
  3. ECM

HINT:
  1. 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.
  2. 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.

Result
Condition
Changes between 0.3 V and 4.2 V
Normal
Less than 0.1 V
P0405 (Low input voltage)
More than 4.9 V
P0406 (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.
Lexus Is250, Is220D. Gse20 Ale20.2Ad-Fhv Engine Control System.Ecd System. Dtc P0405 Exhaust Gas Recirculation Sensor A Circuit Low

WIRING DIAGRAM


Lexus Is250, Is220D. Gse20 Ale20.2Ad-Fhv Engine Control System.Ecd System. Dtc P0405 Exhaust Gas Recirculation Sensor A Circuit Low


INSPECTION PROCEDURE

NOTICE:
After replacing the ECM, the new ECM needs registration (Click here) and initialization (Click here).
1.CHECK EGR VALVE POSITION SENSOR POWER SOURCE


    Lexus Is250, Is220D. Gse20 Ale20.2Ad-Fhv Engine Control System.Ecd System. Dtc P0405 Exhaust Gas Recirculation Sensor A Circuit Low

  1. Disconnect the E64 sensor connector.

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

    Standard voltage:
    Tester Connection
    		Specified 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

  1. Check the EGR valve position sensor (Click here).

    Standard resistance:

    Tester Connection
    		EGR Valve Condition
    		Condition
    		Specified Condition
    VC (3) - E2 (2)
    		-
    		20°C (68°F)
    		3.5 to 6.5 kΩ
    EGLS (4) - E2 (2)
    		Fully opened
    		20°C (68°F)
    		3.9 kΩ
    EGLS (4) - E2 (2)
    		Fully closed
    		20°C (68°F)
    		1.0 kΩ


NG
REPLACE EGR VALVE ASSEMBLY
OK


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


    Lexus Is250, Is220D. Gse20 Ale20.2Ad-Fhv Engine Control System.Ecd System. Dtc P0405 Exhaust Gas Recirculation Sensor A Circuit Low

  1. Disconnect the E64 sensor connector.

  1. Disconnect the E59 ECM connector.

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

    Standard resistance:
    Tester Connection
    		Specified 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 ground
    		10 kΩ or higher
    VC (E64-3) or VCEG (E59-72)- Body ground
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE ECM