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

B0042U8E85
*1 Combination Meter Assembly (Meter Circuit Plate)
*2 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 DTCs. Troubleshoot the SFI system or ECD system.

    SFI system for 1NR-FE: Click here

    SFI system for 1ZR-FAE: Click here

    SFI system for 2ZR-FE: Click here

    SFI system for 1ZR-FE: Click here

    SFI system for 8NR-FTS: Click here

    ECD system for 1ND-TV (w/ Glow Plug Controller): Click here

    ECD system for 1ND-TV (w/o Glow Plug Controller): Click here

    ECD system for 1WW: Click here

  • If the exhaust heat recirculation system has a malfunction, the engine coolant temperature hot 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.

      w/ Central Gateway ECU: Click here

      w/o Central Gateway ECU: 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 w/ Central Gateway ECU: Click here
    GO TO CAN COMMUNICATION SYSTEM w/o Central Gateway ECU: Click here

    A

  2. SYSTEM CHECK


    1. Check the engine coolant temperature hot warning light.

      Result
      Result Proceed to
      Engine coolant temperature hot warning light does not come on. A
      Engine coolant temperature hot warning light remains on. B

    B

    GO TO STEP 4 Click here

    A

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


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    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
      Indicat. Lamp Coolant Hot Engine coolant temperature hot warning light OFF or ON -

      Body Electrical > Combination Meter > Active Test
      Tester Display
      Indicat. Lamp Coolant Hot
      OK
      Engine coolant temperature hot warning light operation is normal.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE COMBINATION METER ASSEMBLY for Hatchback, Wagon: Click here
    REPLACE COMBINATION METER ASSEMBLY for Sedan: Click here

    OK

  4. CHECK FOR DTC


    1. Check if SFI system, ECD system or meter / gauge system DTCs are output.

      SFI system for 1NR-FE: Click here

      SFI system for 1ZR-FAE: Click here

      SFI system for 2ZR-FE: Click here

      SFI system for 1ZR-FE: Click here

      SFI system for 8NR-FTS: Click here

      ECD system for 1ND-TV (w/ Glow Plug Controller): Click here

      ECD system for 1ND-TV (w/o Glow Plug Controller): Click here

      ECD system for 1WW: Click here

      Meter / gauge system: Click here

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

    B

    GO TO SFI SYSTEM for 1NR-FE: Click here
    GO TO SFI SYSTEM for 1ZR-FAE: Click here
    GO TO SFI SYSTEM for 2ZR-FE: Click here
    GO TO SFI SYSTEM for 1ZR-FE: Click here
    GO TO SFI SYSTEM for 8NR-FTS: Click here

    C

    GO TO ECD SYSTEM for 1ND-TV (w/ Glow Plug Controller): Click here
    GO TO ECD SYSTEM for 1ND-TV (w/o Glow Plug Controller): Click here
    GO TO ECD SYSTEM for 1WW: Click here

    D

    GO TO METER / GAUGE SYSTEM Click here

    A

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


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

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


      1. Engine and ECT (for Gasoline)


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

        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

      2. Engine and ECT (for Diesel)


        Powertrain > Engine and ECT > Data List
        Tester Display Measurement Item Type Range Normal Condition Reference Value Diagnostic Note
        Coolant Temp Engine coolant temperature

        for 1ND-TV:

        Sensor output (engine coolant temperature sensor)

        for 1WW:

        -

        for 1ND-TV:

        Min.: -40°C, Max.: 140°C

        for 1WW:

        Min.: -40°C, Max.: 215°C

        for 1ND-TV:

        After warming up engine: 75 to 100°C (167 to 212°F)

        for 1WW:

        After warming up engine: 75 to 90°C (167 to 194°F)

        for 1ND-TV:

        After warming up engine: 75°C (167°F)

        for 1WW:

        -

        for 1ND-TV:


        • After a long soak, the coolant temperature, intake air temperature, and ambient air temperature are approximately equal.

        • If the value is -30°C (-22°F) or less, or 120°C (248°F) or higher, the sensor circuit is open or shorted.

        Cause of Out of Range:


        • Engine coolant temperature sensor

        Symptoms when out of range:

        Difficult starting when engine is cold, rough idle, black smoke, lack of power

        for 1WW:

        -

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

      3. 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 (32°F), Max.: 127.5°C (261.5°F)

        except 1WW:

        75 to 100 °C (167 to 212°F): After warming up engine

        for 1WW:

        75 to 90°C (167 to 194°F): After warming up engine

        		 -

        Body Electrical > Combination Meter > Data List
        Tester Display
        Coolant Temperature
      Result
      Result Proceed to
      The data List values of the ECUs do not match. A
      The 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 for 1NR-FE: Click here
    REPLACE ECM for 1ZR-FAE: Click here
    REPLACE ECM for 2ZR-FE: Click here
    REPLACE ECM for 1ZR-FE: Click here
    REPLACE ECM for 8NR-FTS: Click here
    REPLACE ECM for 1ND-TV (w/ Glow Plug Controller): Click here
    REPLACE ECM for 1ND-TV (w/o Glow Plug Controller): Click here
    REPLACE ECM for 1WW: Click here

    A

  6. REPLACE COMBINATION METER ASSEMBLY


    1. Replace the combination meter assembly with a new or known good one.

      for Hatchback, Wagon: Click here

      for Sedan: Click here

      OK
      The operation of the engine coolant temperature hot warning light returns to normal.
      Result
      Proceed to
      OK
      NG

    OK

    END

    NG

    REPLACE ECM for 1NR-FE: Click here
    REPLACE ECM for 1ZR-FAE: Click here
    REPLACE ECM for 2ZR-FE: Click here
    REPLACE ECM for 1ZR-FE: Click here
    REPLACE ECM for 8NR-FTS: Click here
    REPLACE ECM for 1ND-TV (w/ Glow Plug Controller): Click here
    REPLACE ECM for 1ND-TV (w/o Glow Plug Controller): Click here
    REPLACE ECM for 1WW: Click here