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

A01EQ5CE10

INSPECTION PROCEDURE

Tech Tips

If there is an open or short in the engine coolant temperature sensor circuit, an SFI system DTC is output. If output, perform troubleshooting on the SFI system first.

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Check for DTCs Click here.

      Result
      Result Proceed to
      CAN communication system DTC is not output A
      CAN communication system (for LHD) DTC is output B
      CAN communication system (for RHD) DTC is output C

    B

    Go to CAN COMMUNICATION SYSTEM Click here

    C

    Go to CAN COMMUNICATION SYSTEM Click here

    A

  2. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (COOLANT TEMP)


    1. Operate the intelligent tester according to the display and select the Active Test 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 INTELLIGENT TESTER (COOLANT TEMPERATURE)


    1. Operate the intelligent tester according to the display and select the Data List Click here [3UR-FE], Click here [1UR-FE]).

      Combination Meter
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Coolant Temperature Engine coolant temperature/Min.: -40 (-40), Max.: 140 (284) After warming up: 80 to 105 (176 to 221)

      • Unit: °C (°F)

      • If the value is -40 (-40): The sensor circuit is open

      • If the value is 140 (284): The sensor circuit is shorted.
      OK
      Coolant temperature displayed on the intelligent tester is between 80°C (176°F) and 105°C (221°F) after warming up.

    NG

    REPLACE COMBINATION METER ASSEMBLY Click here

    OK

  4. READ VALUE USING INTELLIGENT TESTER (ENGINE COOLANT TEMPERATURE)


    1. Operate the intelligent tester according to the display and select Data List Click here [3UR-FE], Click here [1UR-FE]).

      Engine
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Coolant Temp Engine coolant temperature/Min.: -40°C (-40°F), Max.:140°C (284°F) 80 to 100°C (176 to 212°F): After warming up

      If the value is -40°C (-40°F): the sensor circuit is open.

      If the value is 140°C (284°F): the sensor circuit is shorted.
      OK
      Engine coolant temperature value displayed on the intelligent tester is almost the same as actual engine coolant temperature.
      Result
      Result Proceed to
      OK A
      NG (3UR-FE) B
      NG (1UR-FE) C

    B

    Go to SFI SYSTEM Click here

    C

    Go to SFI SYSTEM Click here

    A

  5. REPLACE COMBINATION METER ASSEMBLY


    1. Temporarily replace the combination meter with a new one 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 (3UR-FE) B
      NG (1UR-FE) C

    B

    REPLACE ECM Click here

    C

    REPLACE ECM Click here

    A

    END (COMBINATION METER IS DEFECTIVE)