DTC P0405 P0406 2AD-FHV

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.
Toyota fault code list DTC P0405 DTC P0406 

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 and ECT / Data List / EGR Position.
  2. The result values below are for when the ignition 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 DTC P0405 DTC P0406

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.
Monitor description DTC P0405 DTC P0406

Wiring diagram

Refer to DTC P0400

Inspection procedure DTC P0405 DTC P0406

 

NOTICE:

After replacing the ECM, the new ECM needs registration and initialization .

 

1.CHECK EGR VALVE POSITION SENSOR POWER SOURCE

Check egr valve position sensor power source

  1. Disconnect the B54 EGR valve position sensor connector.

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

     

    Standard voltage:

    Tester Connection Specified Condition
    B54-3 (VC) - B54-2 (E2) 4.5 to 5.5 V

  3. Reconnect the EGR valve position sensor connector.

 

  NG  
Go to step 3
 
OK  
   
2.INSPECT EGR VALVE POSITION SENSOR

Inspect egr valve position sensor

  1. Disconnect the B54 EGR valve position sensor connector.

  2. Measure the resistance of the EGR valve position sensor.
     

     

    Standard resistance:

     
    Tester Connection EGR Valve Condition Condition Specified Condition
    B54-3 (VC)- B54-2 (E2) - 20°C (68°F) 3.5 to 6.5 k?
    B54-4 (EGLS) - B54-2 (E2) Fully open 20°C (68°F) 3.9 k?
    B54-4 (EGLS) - B54-2 (E2) Fully closed 20°C (68°F) 1.0 k?

  3. Reconnect the EGR valve position sensor connector.

 

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

Check wire harness (egr valve position sensor - ecm)

  1. Disconnect the B54 sensor connector.

  2. Disconnect the B32 ECM connector.

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

     

    Standard resistance:

    Tester Connection Specified Condition
    B54-3 (VC) - B32-72 (VCEG) Below 1 ?
    B54-4 (EGLS) - B32-118 (EGLS) Below 1 ?
    B54-2 (E2) - B32-95 (EEGL) Below 1 ?
    B54-3 (VC) or B32-72 (VCEG) - Body ground 10 k? or higher
    B54-4 (EGLS) or B32-118 (EGLS) - Body ground 10 k? or higher

  4. Reconnect the EGR valve position sensor connector.

  5. Reconnect the ECM connector.

 

  NG  
REPAIR OR REPLACE HARNESS AND CONNECTOR
 
OK  
   
REPLACE ECM 
2AD-FHV