Dtc P0405 Exhaust Gas Recirculation Sensor A Circuit Low


DESCRIPTION

MONITOR DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK ECM (EGR VALVE POSITION SENSOR VOLTAGE)

INSPECT EGR VALVE POSITION SENSOR (EGLS VOLTAGE)

CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

CHECK HARNESS AND CONNECTOR

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

CHECK ECM (CHECK RESISTANCE)

REPLACE ELECTRIC EGR CONTROL VALVE ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

REPLACE ECM

CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

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 electric EGR control valve assembly and used for detecting the EGR valve angle. The EGR valve angle detected by the sensor is sent to the ECM as feedback. The ECM then regulates the EGR valve angle in accordance with engine running conditions.

P0405
DTC Detection Drive Pattern
DTC Detection Condition
Trouble Area
Engine switch on (IG) for 5 seconds
EGR valve position sensor output voltage is less than 0.2 V for 2 seconds.
(1 trip detection logic)
  1. Open or short in EGR valve position sensor circuit
  2. Electric EGR control valve assembly (EGR valve position sensor)
  3. ECM

P0406
DTC Detection Drive Pattern
DTC Detection Condition
Trouble Area
Engine switch on (IG) for 5 seconds
EGR valve position sensor output voltage is higher than 4.8 V for 2 seconds.
(1 trip detection logic)
  1. Open or short in EGR valve position sensor circuit
  2. Electric EGR control valve assembly (EGR valve position sensor)
  3. ECM

MONITOR DESCRIPTION

When the output voltage of the EGR valve position sensor deviates from the normal operating range of 0.2 to 4.8 V for more than 2 seconds, the ECM interprets this as a malfunction of the sensor circuit and illuminates the MIL.

WIRING DIAGRAM

Refer to DTC P042E (LandCruiser RM000004KMK024X_03.html).

INSPECTION PROCEDURE

NOTICE:
After replacing the ECM, the new ECM needs registration (LandCruiser RM0000012XK0AVX.html) and initialization (LandCruiser RM000000TIN08IX.html).
HINT:
Read freeze frame data using the GTS. 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.
1.CHECK ECM (EGR VALVE POSITION SENSOR VOLTAGE)


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.1Gd-Ftv Engine Control.Ecd System. Dtc P0405 Exhaust Gas Recirculation Sensor A Circuit Low

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    C151-31 (VCEG) - C151-24 (EEGL)
    		Engine switch on (IG)
    		4.5 to 5.5 V
    Text in Illustration
    *a
    		Component with harness connected
    (ECM)


NG
Go to step 10
OK


2.INSPECT EGR VALVE POSITION SENSOR (EGLS VOLTAGE)


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.1Gd-Ftv Engine Control.Ecd System. Dtc P0405 Exhaust Gas Recirculation Sensor A Circuit Low

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    C151-25 (EGLS) - C151-24 (EEGL)
    		Engine switch on (IG)
    		0.6 to 1.4 V
    Text in Illustration
    *a
    		Component with harness connected
    (ECM)


NG
Go to step 4
OK


3.CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

  1. Connect the GTS to the DLC3.

  1. Clear the DTCs (LandCruiser RM000000PDK1ENX.html).

  1. Turn the engine switch off.

  1. Turn the engine switch on (IG) for 5 seconds or more.

  1. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

  1. Confirm that the DTC is not output again.



NEXT
CHECK FOR INTERMITTENT PROBLEMS (LandCruiser RM000000PDQ1A0X.html)

4.CHECK HARNESS AND CONNECTOR


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.1Gd-Ftv Engine Control.Ecd System. Dtc P0405 Exhaust Gas Recirculation Sensor A Circuit Low

  1. Disconnect the electric EGR control valve assembly connector.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    C127-3 (VC) - C127-1 (E2)
    		Engine switch on (IG)
    		4.5 to 5.5 V
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Electric EGR control valve assembly)

  1. Reconnect the electric EGR control valve assembly connector.



NG
Go to step 8
OK


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

  1. Disconnect the electric EGR control valve assembly connector.

  1. Disconnect the ECM connector.

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

    Standard Resistance:

    Tester Connection
    		Condition
    		Specified Condition
    C127-3 (VC) - C151-31 (VCEG)
    		Always
    		Below 1 Ω
    C127-2 (VTA) - C151-25 (EGLS)
    		Always
    		Below 1 Ω
    C127-1 (E2) - C151-24 (EEGL)
    		Always
    		Below 1 Ω
    C127-3 (VC) or C151-31 (VCEG) - Body ground and other terminals
    		Always
    		10 kΩ or higher
    C127-2 (VTA) or C151-25 (EGLS) - Body ground and other terminals
    		Always
    		10 kΩ or higher

  1. Reconnect the electric EGR control valve assembly connector.

  1. Reconnect the ECM connector.



NG
Go to step 8
OK


6.CHECK ECM (CHECK RESISTANCE)


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.1Gd-Ftv Engine Control.Ecd System. Dtc P0405 Exhaust Gas Recirculation Sensor A Circuit Low

  1. Disconnect the electric EGR control valve assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    C127-3 (VC) - C127-2 (VTA)
    		Engine switch off
    		No short or open
    C127-2 (VTA) - C127-1 (E2)
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Electric EGR control valve assembly)

  1. Reconnect the electric EGR control valve assembly connector.



NG
Go to step 9
OK


7.REPLACE ELECTRIC EGR CONTROL VALVE ASSEMBLY

  1. Replace the electric EGR control valve assembly (LandCruiser RM000005UJR000X.html).



NEXT
Go to step 10

8.REPAIR OR REPLACE HARNESS OR CONNECTOR

  1. Repair or replace the harness or connector.



NEXT
Go to step 10

9.REPLACE ECM

  1. Replace the ECM (LandCruiser RM0000013Z002DX.html).



NEXT
Go to step 10

10.CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

  1. Connect the GTS to the DLC3.

  1. Clear the DTCs (LandCruiser RM000000PDK1ENX.html).

  1. Turn the engine switch on (IG) for 2 seconds or more.

  1. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

  1. Confirm that the DTC is not output again.


NEXT

END