ECD SYSTEM(w/ Urea SCR System), Diagnostic DTC:P2470, P2471

DTC Code DTC Name
P2470 Exhaust Gas Temperature Sensor Circuit Low (Bank 1 Sensor 4)
P2471 Exhaust Gas Temperature Sensor Circuit High (Bank 1 Sensor 4)

DESCRIPTION

B0027TKE01
*1 No. 4 Exhaust Gas Temperature Sensor
*2 Exhaust Gas
*3 SCR Catalyst

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.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P2470 Exhaust Gas Temperature Sensor Circuit Low (Bank 1 Sensor 4)

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):


  • After starting the engine, 1 minute or more elapses

  • Engine is running

  • Coolant temperature is 70°C (158°F) or higher

  • Open or short in No. 4 exhaust gas temperature sensor circuit

  • No. 4 exhaust gas temperature sensor

  • ECM

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

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):


  • After starting the engine, 1 minute or more elapses

  • Engine is running

  • Coolant temperature is 70°C (158°F) or higher

  • Open or short in No. 4 exhaust gas temperature sensor circuit

  • No. 4 exhaust gas temperature sensor

  • ECM

 Comes on DTC stored
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.

CONFIRMATION DRIVING PATTERN

DTC No. DTC Detection Drive Pattern

P2470

P2471

 Idle the engine for 3 seconds after warming up the engine (the engine coolant temperature is 70°C (158°F) or higher) and allowing 1 minute to elapse after starting the engine.

WIRING DIAGRAM

B0028L2E03
*a THSO
*b ETSO
*c No. 4 Exhaust Gas Temperature Sensor

CAUTION / NOTICE / HINT

Note

After replacing the ECM, the new ECM needs registration (Click here ) and initialization Click here.

Tech Tips

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.

PROCEDURE


  1. INSPECT NO. 4 EXHAUST GAS TEMPERATURE SENSOR


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

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE NO. 4 EXHAUST GAS TEMPERATURE SENSOR Click here

    OK

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


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

    2. Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      e2-2 (THSO) - G85-26 (THSO) Always Below 1 Ω
      e2-1 (E2) - G85-33 (ETSO) Always Below 1 Ω
      e2-2 (THSO) or G85-26 (THSO) - Body ground and other terminals Always 10 kΩ or higher
      e2-1 (E2) or G85-33 (ETSO) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  3. REPLACE ECM


    1. Replace the ECM.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 5 Click here

  4. REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the harness or connector.

      Result
      Proceed to
      NEXT

    NEXT

  5. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the GTS to the DLC3.

    2. Clear the DTCs.

    3. Turn the ignition switch off and wait for at least 30 seconds.

    4. Turn the ignition switch to ON and turn the GTS on.

    5. Start the engine.

    6. Idle the engine for 3 seconds or more after warming up the engine (the engine coolant temperature is 70°C (158°F) or higher) and allowing 1 minute to elapse after starting the engine.

    7. Enter the following menus: Powertrain / Engine / Trouble Codes.

    8. Confirm that the DTC is not output again.


      Powertrain > Engine > Trouble Codes
      Result
      Proceed to
      NEXT

    NEXT

    END

  6. REPLACE NO. 4 EXHAUST GAS TEMPERATURE SENSOR


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

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 5 Click here