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 via the CAN communication system. The combination meter assembly displays an engine coolant temperature warning based on the data received from the ECM.

WIRING DIAGRAM

E143765E85

CAUTION / NOTICE / HINT

Note:

When it is necessary to replace the combination meter assembly, be sure to replace it with a new one.

Tip:

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

for 1KR-FE:Click here

for 1PP:Click here

PROCEDURE

  1. CHECK CAN COMMUNICATION SYSTEM

    1. Check if CAN communication system DTCs are output.

      Click hereClick here

      Body Electrical > Combination Meter > Trouble Codes

    Result

    Result

    Proceed to

    CAN communication system DTCs are not output.

    A

    CAN communication system DTCs are output.

    B
    B

    GO TO CAN COMMUNICATION SYSTEM

    Click hereClick 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 blinks or 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

    Click here

    OK

  4. CHECK FOR DTC

    1. Check if SFI system DTCs are output.

      for 1KR-FE:Click here

      for 1PP:Click here

      Powertrain > Engine and ECT > Trouble Codes

    Result

    Result

    Proceed to

    SFI system DTCs are not output.

    A

    SFI system DTCs are output.

    B
    B

    GO TO SFI SYSTEM

    for 1KR-FE:Click here

    for 1PP: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 1KR-FE:

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

      2. for 1PP:

        for Engine: Powertrain / Engine / Data List.

      3. 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 1KR-FE)

        Powertrain > Engine and ECT > Data List

        Tester Display

        Measurement Item

        Range

        Normal Condition

        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 air temperature are approximately equal.

        • If the value is -40°C (-40°F), or 140°C (284°F), the sensor circuit is open or shorted.

        Powertrain > Engine and ECT > Data List

        Tester Display

        Coolant Temp

      2. Engine (for 1PP)

        Powertrain > Engine > Data List

        Tester Display

        Measurement Item

        Range

        Reference Value

        Water Temperature Not Corrected

        Water Temperature Not Corrected

        Min.: -50°C (-58°F), Max.: 150°C (302°F)

        84°C (183°F):

        Idle (warmed up)

        Powertrain > Engine > Data List

        Tester Display

        Water Temperature Not Corrected

      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)

        75 to 95 °C (167 to 203°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 malfunction of the ECM or an internal malfunction of the combination meter assembly is suspected.

    B

    REPLACE ECM

    for 1KR-FE:Click here

    for 1PP:Click here

    A

  6. 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 light returns to normal.

    Result

    Proceed to

    OK

    NG
    OK

    END

    NG

    REPLACE ECM

    for 1KR-FE:Click here

    for 1PP:Click here