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)	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.

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.

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

Disconnect the E64 sensor connector.

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

Check the EGR valve position sensor .

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)

Disconnect the E64 sensor connector.

Disconnect the E59 ECM connector.

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

LEXUS IS250, IS220d / GSE20 ALE20

2AD-FHV ENGINE CONTROL SYSTEM

Lexus IS250 IS220d GSE20 ALE20

ECD SYSTEM