Dtc P2470 Exhaust Gas Temperature Sensor Circuit Low (Bank 1 Sensor 4)


DESCRIPTION

MONITOR DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT NO. 4 EXHAUST GAS TEMPERATURE SENSOR

CHECK HARNESS AND CONNECTOR (NO. 4 EXHAUST GAS TEMPERATURE SENSOR - ECM)

REPLACE ECM

REPLACE NO. 4 EXHAUST GAS TEMPERATURE SENSOR

REPAIR OR REPLACE HARNESS OR CONNECTOR

CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

DTC P2470 Exhaust Gas Temperature Sensor Circuit Low (Bank 1 Sensor 4)

DTC P2471 Exhaust Gas Temperature Sensor Circuit High (Bank 1 Sensor 4)


DESCRIPTION


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.1Gd-Ftv Engine Control.Ecd System. Dtc P2470 Exhaust Gas Temperature Sensor Circuit Low (Bank 1 Sensor 4)

The No. 4 exhaust gas temperature sensor is installed after the SCR catalyst to detect the exhaust gas temperature. A thermistor built into the No. 4 exhaust gas temperature sensor changes its resistance value according to the exhaust gas temperature. The lower the exhaust gas temperature, the higher the thermistor resistance value. The higher the exhaust gas temperature, the lower the thermistor resistance value. The No. 4 exhaust gas temperature sensor is connected to the ECM. The 5 V power source voltage is applied to the No. 4 exhaust gas temperature sensor from terminal THSO via resistor R. Resistor R and the No. 4 exhaust gas temperature sensor are connected in series. When the resistance value of the No. 4 exhaust gas temperature sensor changes in accordance with the exhaust gas temperature, the voltage at terminal THSO also changes. The No. 4 exhaust gas temperature sensor monitors the temperature downstream of the SCR catalyst.

P2470
DTC Detection Drive Pattern
DTC Detection Condition
Trouble Area
Idle the engine for 3 seconds after warming up the engine (the engine coolant temperature is 60°C (140°F) or higher) and allowing 11 minutes to elapse after starting the engine.
No. 4 Exhaust gas temperature sensor output voltage is below 0.11 V for 3 seconds or more when all conditions are met. (1 trip detection logic):
  1. After starting the engine, 11 minutes or more elapses
  2. Engine is running
  3. Coolant temperature is 60°C (140°F) or higher
  1. Open or short in No. 4 exhaust gas temperature sensor circuit
  2. No. 4 exhaust gas temperature sensor
  3. ECM

P2471
DTC Detection Drive Pattern
DTC Detection Condition
Trouble Area
Idle the engine for 3 seconds after warming up the engine (the engine coolant temperature is 60°C (140°F) or higher) and allowing 11 minutes to elapse after starting the engine.
No. 4 Exhaust gas temperature sensor output voltage is higher than 4.89 V for 3 seconds or more when all conditions are met. (1 trip detection logic):
  1. After starting the engine, 11 minutes or more elapses
  2. Engine is running
  3. Coolant temperature is 60°C (140°F) or higher
  1. Open or short in No. 4 exhaust gas temperature sensor circuit
  2. No. 4 exhaust gas temperature sensor
  3. ECM

Related Data List
DTC No.
Data List
P2470
P2471
SCR Temperature

MONITOR DESCRIPTION

The ECM constantly monitors the output voltages from the No. 4 exhaust gas temperature sensors in order to detect problems with the sensors. When the sensor output voltage deviates from the normal operating range (between 0.11 V and 4.89 V) for more than 3 seconds after the engine is warmed up, the ECM interprets this as malfunction of the sensor circuit and illuminates the MIL.

WIRING DIAGRAM


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.1Gd-Ftv Engine Control.Ecd System. Dtc P2470 Exhaust Gas Temperature Sensor Circuit Low (Bank 1 Sensor 4)


INSPECTION PROCEDURE

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.INSPECT NO. 4 EXHAUST GAS TEMPERATURE SENSOR

  1. Inspect the No. 4 exhaust gas temperature sensor (LandCruiser RM000005UL7000X.html).



NG
Go to step 4
OK


2.CHECK HARNESS AND CONNECTOR (NO. 4 EXHAUST GAS TEMPERATURE SENSOR - ECM)

  1. Disconnect the No. 4 exhaust gas temperature sensor.

  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
    s5-2 (THSO) - G184-26 (THSO)
    		Always
    		Below 1 Ω
    s5-1 (E2) - G184-33 (ETSO)
    		Always
    		Below 1 Ω
    s5-2 (THSO) or G184-26 (THSO) - Body ground and other terminals
    		Always
    		10 kΩ or higher
    s5-1 (E2) or G184-33 (ETSO) - Body ground and other terminals
    		Always
    		10 kΩ or higher

  1. Reconnect the No. 4 exhaust gas temperature sensor.

  1. Reconnect the ECM connector.



NG
Go to step 5
OK


3.REPLACE ECM

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



NEXT
Go to step 6

4.REPLACE NO. 4 EXHAUST GAS TEMPERATURE SENSOR

  1. Replace the No. 4 exhaust gas temperature sensor (LandCruiser RM000005UKN000X.html).



NEXT
Go to step 6

5.REPAIR OR REPLACE HARNESS OR CONNECTOR

  1. Repair or replace the harness or connector.


NEXT


6.CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

  1. Connect the GTS to the DLC3.

  1. Clear the DTCs (LandCruiser RM000000PDK1E5X.html).

  1. Start the engine.

  1. Idle the engine for 3 seconds or more after warming up the engine (the engine coolant temperature is 60°C (140°F) or higher) and allowing 11 minutes to elapse after starting the engine.

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

  1. Confirm that the DTC is not output again.


NEXT

END