METER / GAUGE SYSTEM Malfunction in Water Temperature Warning Light

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 an engine coolant temperature warnings based on the data received from the ECM.

WIRING DIAGRAM

A01KTKWE85
*1 CAN Communication Line
*2 Combination Meter Assembly

CAUTION / NOTICE / HINT

Tech Tips


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

  • If the exhaust heat recirculation system has a malfunction, the engine coolant temperature hot warning (engine coolant temperature symbol) is displayed to inform the driver of the malfunction.

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. SYSTEM CHECK


    1. Check the engine coolant temperature hot warning (engine coolant temperature symbol).

      Result
      Result Proceed to
      Engine coolant temperature hot warning (engine coolant temperature symbol) is always displayed or blinks. A
      Engine coolant temperature hot warning (engine coolant temperature symbol) is not displayed. B

    B

    GO TO STEP 5 Click here

    A

  3. CHECK FOR DTC


    1. Check for DTCs.

      SFI system: Click here

      Meter / gauge system: Click here

      Result
      Result Proceed to
      DTCs are not output. A
      DTCs are output (SFI system). B
      DTC B1503 is output. C

    B

    GO TO SFI SYSTEM Click here

    C

    GO TO METER / GAUGE SYSTEM Click here

    A

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


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus:


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

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

    5. Check the values by referring to the table below.


      Powertrain > Engine and ECT > Data List
      Tester Display Measurement Item Range Normal Condition Reference Value Diagnostic Note
      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 -

      • Stored as Freeze Frame Data: Yes

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

      • Check if the engine overheats when the value indicates 140°C (284°F).

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

      Body Electrical > Combination Meter > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Coolant Temperature Engine coolant temperature 0 to 127.5°C (0 to 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 do not match. A
      Data List values of the ECUs 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 error of the ECM or an internal malfunction of the combination meter assembly is suspected.


    B

    REPLACE ECM Click here

    A

  5. 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 hot warning (engine coolant temperature symbol) returns to normal.
      Result
      Proceed to
      OK
      NG

    OK

    END

    NG

    REPLACE ECM Click here