METER / GAUGE SYSTEM Engine Coolant Temperature Receiver Gauge Malfunction

DESCRIPTION

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

WIRING DIAGRAM

A01G845E66

INSPECTION PROCEDURE

Tech Tips

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

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


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

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

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

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


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS 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 OFF, LOW, NORMAL, HIGH -
      OK
      Engine coolant temperature receiver gauge indication is normal.

    NG

    REPLACE COMBINATION METER ASSEMBLY Click here

    OK

  3. READ VALUE USING GTS (COOLANT TEMPERATURE)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Combination Meter / 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/0 to 127.5°C (0 to 261.5°F) After warming up: 75 to 100°C (167 to 212°F) -
      OK
      Engine coolant temperature displayed on the GTS is almost the same as the engine coolant temperature receiver gauge indication.

      Tech Tips


      • When the Data List values and engine coolant temperature receiver gauge values match, a signal output error of the ECM or an internal malfunction of the combination meter assembly is suspected.

      • When the Data List values and engine coolant temperature receiver gauge values do not match, an internal malfunction of the combination meter assembly is suspected.


    NG

    REPLACE COMBINATION METER ASSEMBLY Click here

    OK

  4. CHECK SFI SYSTEM


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

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

    B

    GO TO SFI SYSTEM Click here

    C

    GO TO SFI SYSTEM Click here

    A

  5. READ VALUE USING GTS (COOLANT TEMPERATURE, COOLANT TEMP)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS 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/0 to 127.5°C (0 to 261.5°F) After warming up: 75 to 100°C (167 to 212°F) -
      Engine and ECT
      Tester Display Measurement Item/Range Normal Condition Stored as Freeze Frame Data
      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 Yes

      Diagnostic Note:

      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 140°C (284°F), the sensor circuit is open or shorted.

      • Check if the engine overheats when the value indicates 140°C (284°F).
      Result
      Result Proceed to
      Data List values of the ECUs do not match. A
      Data List values of the ECUs match (for 2AR-FE). B
      Data List values of the ECUs match (for 2GR-FE). C

      Tech Tips


      • When the Data List values of the ECUs match, an internal malfunction of the ECM 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 Click here

    C

    REPLACE ECM Click here

    A

  6. REPLACE COMBINATION METER ASSEMBLY


    1. Replace the combination meter assembly with a new or known good one Click here.

      OK
      The operation of the engine coolant temperature receiver gauge returns to normal.
      Result
      Result Proceed to
      OK A
      NG (for 2AR-FE) B
      NG (for 2GR-FE) C

    B

    REPLACE ECM Click here

    C

    REPLACE ECM Click here

    A

    END