METER / GAUGE SYSTEM Malfunction in Water Temperature Warning Light

DESCRIPTION

In this circuit, the combination meter sub-assembly receives engine coolant temperature signals from the ECM using the CAN communication system. The combination meter sub-assembly displays engine coolant temperature warnings based on the data received from the ECM.

WIRING DIAGRAM

B005YB8E61
*a Engine Coolant Temperature Sensor
*b Combination Meter Sub-assembly
*c CAN Communication Line

CAUTION / NOTICE / HINT

Tech Tips


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

  • If the exhaust heat recirculation system has a malfunction, the water temperature warning light comes on to inform the driver of the malfunction.

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Check if CAN communication DTCs are output Click here.(w/ Central Gateway ECU)

    2. Check if CAN communication DTCs are output Click here.(w/o Central Gateway ECU)

      Result
      Result Proceed to
      CAN communication DTCs are not output. A
      CAN communication DTCs are output. (w/ Central Gateway ECU) B
      CAN communication DTCs are output. (w/o Central Gateway ECU) C

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    C

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  2. SYSTEM CHECK


    1. Check the Water temperature warning light.

      Result
      Result Proceed to
      Water temperature warning light does not come on. A
      Water temperature warning light remains on. B

    B

    CHECK FOR DTC Click here

    A

  3. PERFORM ACTIVE TEST USING GTS (INDICAT. LAMP COOLANT HOT)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Combination Meter / Active Test.

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

      Combination Meter
      Tester Display Test Part Control Range Diagnostic Note
      Indicat. Lamp Coolant Hot Water temperature warning light OFF or ON -
      OK
      Water temperature warning light operation is normal.
      Result
      Result Proceed to
      OK A
      NG (w/o Multi-information display) B
      NG (w/ Multi-information display) C

    B

    REPLACE METER CIRCUIT PLATE Click here

    C

    REPLACE COMBINATION METER SUB-ASSEMBLY Click here

    A

  4. CHECK FOR DTC


    1. Check for DTCs (See page for SFI System, Click here for Meter/Gauge System).

      Result
      Result Proceed to
      DTC is not output. A
      DTC of SFI system is output. B
      DTC B1503 is output. C

    B

    GO TO SFI SYSTEM Click here

    C

    GO TO METER / GAUGE SYSTEM Click here

    A

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


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

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

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

      Combination Meter
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Coolant Temperature Engine coolant temperature / 0 to 127.5°C (0 to 261.5°F) After warming up: 75 to 100°C (167 to 212°F) -
      Engine and ECT
      Tester Display Measurement Item/Range Normal Condition Stored as Freeze Frame Data
      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 Yes

      Diagnostic Note:

      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 air temperature are approximately equal.

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

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

      Note

      Enter inspection mode Click here.

      Result
      Result Proceed to
      The data list values of the ECUs do not match (w/o Multi-information display). A
      The data list values of the ECUs do not match (w/ Multi-information display). B
      The data list values of the ECUs match. C

      Tech Tips

      When the Data List values of the ECUs do not match, a signal output error of the ECM is suspected.


    B

    REPLACE COMBINATION METER SUB-ASSEMBLY Click here

    C

    GO TO SFI SYSTEM Click here

    A

  6. REPLACE METER CIRCUIT PLATE


    1. Replace the meter circuit plate with a new or a known good one Click here.

      OK
      The operation of the water temperature warning light returns to normal.

    OK

    END

    NG

    REPLACE ECM Click here

  7. REPLACE COMBINATION METER SUB-ASSEMBLY


    1. Replace the combination meter sub-assembly with a new or a known good one Click here.

      OK
      The operation of the water temperature warning light returns to normal.

    OK

    END

    NG

    REPLACE ECM Click here