METER / GAUGE SYSTEM Malfunction in Water Temperature Warning Light

DTC Code DTC Name
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

E143765E85

CAUTION / NOTICE / HINT

Tip:

  • 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.

      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 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

    CHECK FOR DTCClick 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

    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

    for 1ZR-FAE:Click here

    for 2ZR-FE:Click here

    for 1ZR-FE:Click here

    for 8NR-FTS:Click here

    C

    GO TO ECD SYSTEM

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

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

    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.

        Tip:

        • 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

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

        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
    Tip:

    • 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

    for 1ZR-FAE:Click here

    for 2ZR-FE:Click here

    for 1ZR-FE:Click here

    for 8NR-FTS:Click here

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

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

    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

    for 1ZR-FAE:Click here

    for 2ZR-FE:Click here

    for 1ZR-FE:Click here

    for 8NR-FTS:Click here

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

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

    for 1WW:Click here