METER / GAUGE SYSTEM Engine Coolant Temperature Gauge Malfunction

DESCRIPTION

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

WIRING DIAGRAM

A0053R5E01
*1 Combination Meter Assembly
*2 CAN Communication Line

CAUTION / NOTICE / HINT

Tech Tips

If there is an open or short in the engine coolant temperature sensor circuit, an SFI system DTC is output. If an SFI system DTC is output, perform troubleshooting for the SFI system first.

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Check for DTCs Click here.

      Result
      Result Proceed to
      CAN communication system DTC is not output A
      CAN communication system DTC is output B

    B

    Go to CAN COMMUNICATION SYSTEM Click here

    A

  2. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (ENGINE COOLANT TEMP)


    1. Use the Active Test to check the operation of the engine coolant temperature receiver gauge Click here.

      Combination Meter
      Tester Display Test Part Control Range Diagnostic Note
      Water Temperature Meter Operation Engine coolant temperature receiver gauge LOW, NORMAL or HIGH Perform the test with the vehicle stopped and the engine idling.

      Tech Tips

      Confirm that the vehicle is stopped and the engine is idling.

      OK
      Needle indication is normal.

    NG

    REPLACE COMBINATION METER ASSEMBLY Click here

    OK

  3. READ VALUE USING INTELLIGENT TESTER (COOLANT TEMPERATURE)


    1. Use the Data List to check if the engine coolant temperature receiver gauge is operating properly Click here.

      Combination Meter
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Coolant Temperature Engine coolant temperature/Min.: -40 (-40), Max.: 127.5 (261.5) After warming up: 80 to 95 (176 to 203)

      • Unit: °C (°F)

      • If the value is -40 (-40), the sensor circuit is open.

      • If the value is 127.5 (261.5), the sensor circuit is shorted.
      OK
      Coolant temperature displayed on the intelligent tester is between 80°C (176°F) and 95°C (203°F) after warming up.

    NG

    REPLACE COMBINATION METER ASSEMBLY Click here

    OK

  4. READ VALUE USING INTELLIGENT TESTER (ENGINE COOLANT TEMPERATURE)


    1. Use the Data List to check if the engine coolant temperature sensor is operating properly Click here.

      Engine
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Coolant Temp Engine coolant temperature/Min.: -40°C (-40°F), Max.: 140°C (284°F) After warming up: 80 to 100°C (176 to 212°F)

      • If the value is -40°C (-40°F), the sensor circuit is open.

      • If the value is 140°C (284°F), the sensor circuit is shorted.
      OK
      Engine coolant temperature value displayed on the intelligent tester is almost the same as actual engine coolant temperature.

      Tech Tips


      • for 1ZR-FAE:

        If it is necessary to refer to the SFI system, refer to the following procedures (See page ).

        Click here

      • for 2ZR-FAE:

        If it is necessary to refer to the SFI system, refer to the following procedures (See page ).

        Click here

      • for 3ZR-FE:

        If it is necessary to refer to the SFI system, refer to the following procedures (See page ).

        Click here

      • for 3ZR-FAE:

        If it is necessary to refer to the SFI system, refer to the following procedures (See page ).

        Click here


    NG

    Go to SFI SYSTEM

    OK

  5. REPLACE COMBINATION METER ASSEMBLY


    1. Temporarily replace the combination meter with a new one or normally functioning Click here.


    NEXT

  6. CHECK COMBINATION METER ASSEMBLY


    1. Check that the operation of the combination meter returns to normal Click here.

      OK
      Operation of combination meter returns to normal.

      Tech Tips


      • for 1ZR-FAE:

        If it is necessary to replace the ECM, refer to the following procedures Click here.

      • for 2ZR-FAE:

        If it is necessary to replace the ECM, refer to the following procedures Click here.

      • for 3ZR-FE:

        If it is necessary to replace the ECM, refer to the following procedures Click here.

      • for 3ZR-FAE:

        If it is necessary to replace the ECM, refer to the following procedures Click here.


    OK

    END (COMBINATION METER IS DEFECTIVE)

    NG

    REPLACE ECM