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

B0072RTE85
*1 Combination Meter Assembly (Meter Circuit Plate)
*2 CAN Communication Line

CAUTION / NOTICE / HINT

Note

Before replacing the ECM, refer to Service Bulletin.

Tech Tips


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

    w/ Canister PumpModule: Click here

    w/o Canister PumpModule: Click here

  • Active Test cannot be performed on the engine coolant temperature receiver gauge for TFT meter type.

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. CONFIRM MODEL


    1. Choose the model to be inspected.

      Result
      Result Proceed to
      for Optitron Meter Type A
      for TFT Meter Type B

    B

    GO TO STEP 4 Click here

    A

  3. 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. Perform the Active Test according to the display on the GTS.


      Body Electrical > Combination Meter > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Water Temperature Meter Operation Engine coolant temperature receiver gauge OFF, LOW, NORMAL, HIGH -

      Body Electrical > Combination Meter > Active Test
      Tester Display
      Water Temperature Meter Operation
      OK
      Engine coolant temperature receiver gauge indication is normal.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE COMBINATION METER ASSEMBLY Click here

    OK

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


      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
      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 malfunction 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.

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE COMBINATION METER ASSEMBLY Click here

    OK

  5. CHECK FOR DTC


    1. Check if SFI system DTCs are output.

      w/ Canister Pump Module: Click here

      w/o Canister Pump Module: Click here


      Powertrain > Engine > Trouble Codes
      Result
      Result Proceed to
      SFI system DTCs are not output. A
      SFI system DTCs are output. B

    B

    GO TO SFI SYSTEM w/ Canister Pump Module: Click here
    GO TO SFI SYSTEM w/o Canister Pump Module: Click here

    A

  6. READ VALUE USING GTS (COOLANT TEMP, 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:


      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


        Powertrain > Engine > 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.

        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 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 Temp

      2. 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
      Data List values of the ECUs match. A
      Data List values of the ECUs do not match. B

      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.


    B

    REPLACE ECM Click here

    A

  7. 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
      Proceed to
      OK
      NG

    OK

    END

    NG

    REPLACE ECM Click here