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

A004OS4E01
*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 ECD system DTC is output. If an ECD system DTC is output, perform troubleshooting for the ECD system first.

PROCEDURE


  1. CHECK FOR DTC (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 GTS (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 GTS (COOLANT TEMPERATURE)


    1. Using the GTS, read the Data List Click here.

      Combination Meter
      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 the engine -
      OK
      Coolant temperature displayed on the GTS is between 75°C (167°F) and 100°C (212°F) after warming up.

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here

    NG

  4. READ VALUE USING GTS (ENGINE COOLANT TEMPERATURE)


    1. Using the GTS, read the Data List Click here.

      Engine
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Coolant Temp Engine coolant temperature / Min.: -40°C (-40°F), Max: 215°C (419°F) 75 to 100°C (167 to 212°F): After warming up the engine -
      OK
      Engine coolant temperature value displayed on the GTS is almost the same as actual engine coolant temperature.
      Result
      Result Proceed to
      OK A
      NG (for 1WW) B
      NG (for 2WW) C

    B

    GO TO ECD SYSTEM Click here

    C

    GO TO ECD SYSTEM Click here

    A

  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.
      Result
      Result Proceed to
      OK A
      NG (for 1WW) B
      NG (for 2WW) C

    A

    END (COMBINATION METER IS DEFECTIVE)

    B

    REPLACE ECM Click here

    C

    REPLACE ECM Click here