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 via CAN communication. The combination meter assembly displays the engine coolant temperature that is calculated based on the data received from the ECM.

WIRING DIAGRAM

A001VCCE02
*1 CAN Communication Line
*2 Combination Meter Assembly

CAUTION / NOTICE / HINT

Note


  • Before replacing the ECM, refer to Service Bulletin.

  • When replacing the combination meter assembly, always replace it with a new one. If a combination meter assembly which was installed to another vehicle is used, the information stored in it will not match the information from the vehicle and a DTC may be stored.

Tech Tips

If there is an open or short in the engine coolant temperature sensor circuit, the ECM stores DTCs. Troubleshoot the SFI system.


PROCEDURE


  1. CHECK FOR DTC (METER / GAUGE SYSTEM)


    1. Check for DTCs.

      Click here

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

    B

    GO TO DIAGNOSTIC TROUBLE CODE CHART Click here

    A

  2. CHECK FOR DTC (SFI SYSTEM)


    1. Check for DTCs.


      Result
      Result Proceed to
      DTCs are not output. A
      DTCs are output. (for 8NR-FTS) B
      DTCs are output. (for 3ZR-FAE) C

    B

    GO TO DIAGNOSTIC TROUBLE CODE CHART Click here

    C

    GO TO DIAGNOSTIC TROUBLE CODE CHART Click here

    A

  3. READ VALUE USING GTS (ENGINE SPEED, ENGINE RPM)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus:


      1. for Engine: Powertrain / Engine / Data List.

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

    5. Read the Data List according to the display on the GTS.


      1. Engine. (for 8NR-FTS)


        Powertrain > Engine > Data List
        Tester Display Measurement Item Range Normal Condition Diagnostic Note
        Coolant Temperature Engine coolant temperature Min.: -40°C (-40°F), Max.: 140°C (284°F) 75 to 100°C (167 to 212°F): After warming up engine

        This is the engine coolant temperature.


        • 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 temperature are approximately equal.

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

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

        Powertrain > Engine > Data List
        Tester Display
        Coolant Temperature

      2. Engine and ECT. (for 3ZR-FAE)


        Powertrain > Engine and ECT > Data List
        Tester Display Measurement Item Range Normal Condition Diagnostic Note
        Coolant Temp Engine coolant temperature Min.: -40°C (-40°F), Max.: 140°C (284°F) 75 to 100°C (167 to 212°F): After warming up engine

        This is the engine coolant temperature.


        • 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 temperature are approximately equal.

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

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

        Powertrain > Engine and ECT > Data List
        Tester Display
        Coolant Temp

      3. Combination Meter.


        Body Electrical > Combination Meter > Data List
        Tester Display Measurement Item Range Normal Condition Diagnostic Note
        Coolant Temperature Engine coolant temperature Min.: 0°C (0°F), Max.: 127.5°C (261.5°F) 75 to 100°C (167 to 212°F): After warming up engine -

        Body Electrical > Combination Meter > Data List
        Tester Display
        Coolant Temperature
        Result
        Result Proceed to
        The Data List values of the ECUs do not match (for 8NR-FTS) A
        The Data List values of the ECUs do not match (for 3ZR-FAE) B
        The Data List values of the ECUs match 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 malfunction of the ECM or an internal malfunction of the combination meter assembly is suspected.


    A

    REPLACE ECM Click here

    B

    REPLACE ECM Click here

    C

    REPLACE COMBINATION METER ASSEMBLY Click here