METER / GAUGE SYSTEM Engine Coolant Temperature Receiver Gauge Malfunction

DESCRIPTION

In this circuit, the meter ECU receives engine coolant temperature signals from the ECM using the CAN communication system. The meter ECU displays an engine coolant temperature indication that is calculated based on the data received from the ECM.

WIRING DIAGRAM

A01HUHRE66

INSPECTION PROCEDURE

Tech Tips

If there is an open or short in the engine coolant temperature sensor circuit, the ECM stores the DTCs. Troubleshoot SFI System Click here for 2AR-FXE).

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Check if CAN communication DTCs are output Click here.

      Result
      Result Proceed to
      DTCs are not output. A
      DTCs are output. B

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  2. PERFORM ACTIVE TEST USING TECHSTREAM (WATER TEMPERATURE METER OPERATION)


    1. Connect the Techstream to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the Techstream on.

    4. Enter the following menus: Body Electrical / Combination Meter / Active Test.

    5. Check the operation by referring to the table below.

      Combination Meter
      Tester Display Test Part Control Range Diagnostic Note
      Water Temperature Meter Operation Engine coolant temperature receiver gauge Low, Normal, High -
      OK
      Engine coolant temperature receiver gauge indication is normal.

    NG

    REPLACE COMBINATION METER ASSEMBLY Click here

    OK

  3. CHECK SFI SYSTEM


    1. Check if SFI system DTCs are output Click here for 2AR-FXE).

      Result
      Result Proceed to
      DTCs are not output. A
      DTCs are output (for 2AR-FXE). B

    B

    GO TO SFI SYSTEM (for 2AR-FXE) Click here

    A

  4. READ VALUE USING TECHSTREAM (COOLANT TEMPERATURE, COOLANT TEMP)


    1. Connect the Techstream to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the Techstream on.

    4. Enter the following menus:


      1. for Combination Meter: Body Electrical / Combination Meter / Data List.

      2. for Engine and ECT: Powertrain / Engine and ECT / Data List.

    5. Check the values by referring to the table below.

      Combination Meter
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Coolant Temperature Engine coolant temperature/-40 to 140°C (-40 to 284°F) After warming up: 75 to 100°C (167 to 212°F)

      • If -40°C (-40°F): Sensor circuit open

      • If 140°C (284°F) or more: Sensor circuit shorted
      Engine and ECT
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Coolant Temp Coolant temperature/Min.: -40°C (-40°F), Max.: 140°C (284°F) 75 to 100°C (167 to 212°F): After warming up

      • Stored as Freeze Frame Data

      • This is the engine coolant temperature.

      Tech Tips


      • After warming up the engine, the engine coolant temperature is 75 to 100°C (167 to 212°F).

      • After a long soak, the engine coolant temperature, intake air temperature and ambient air temperature are approximately equal.

      • If the value is -40°C (-40°F), or higher than 135°C (275°F), the sensor circuit is open or shorted.

      • Check if the engine overheats when the value indicates higher than 135°C (275°F).

      Note

      Enter inspection mode Click here.

      Result
      Result Proceed to
      The Data List values of the ECUs match. A
      The Data List values of the ECUs do not match (for 2AR-FXE). B

      Tech Tips


      • When the Data List values of the ECUs match, an internal malfunction of the combination meter assembly is suspected.

      • When the Data List values of the ECUs do not match, a signal output error of the ECM or an internal malfunction of the combination meter assembly is suspected


    B

    REPLACE ECM (for 2AR-FXE) Click here

    A

    REPLACE COMBINATION METER ASSEMBLY Click here