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METER / GAUGE SYSTEM Engine Coolant Temperature Gauge Malfunction

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DTC Code DTC Name
  Engine Coolant Temperature Gauge Malfunction
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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.

Table 1. *1 CAN Line *2 Combination Meter Assembly
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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Tip:

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.

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PROCEDURE


  1. Click here

    CHECK CAN COMMUNICATION SYSTEM


    1. Check for DTCs (Click here).

      Table 2. Result
      Result Proceed to
      CAN communication system DTC is not output A
      CAN communication system (for LHD with Central Gateway ECU) DTC is output B
      CAN communication system (for LHD without Central Gateway ECU) DTC is output C
      CAN communication system (for RHD with Central Gateway ECU) DTC is output D
      CAN communication system (for RHD without Central Gateway ECU) DTC is output E

  2. Click here

    PERFORM ACTIVE TEST USING GTS (COOLANT TEMP)


    1. Operate the GTS according to the display and select Active Test.

      Table 3. 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 engine idling.
      Tip:

      Confirm that the vehicle is stopped and the engine is idling.

      OK
      Needle indication is normal.

  3. Click here

    READ VALUE USING GTS (COOLANT TEMPERATURE)


    1. Operate the GTS according to the display and select Data List.

      Table 4. 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 GTS is between 80°C (176°F) and 95°C (203°F) after warming up.
      Table 5. Result
      Result Proceed to
      OK A
      NG B

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    READ VALUE USING GTS (ENGINE COOLANT)


    1. Operate the GTS according to the display and select Data List.

      Table 6. Engine*1, *2, *3
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Coolant Temp

      Engine coolant temperature:

      Min.: -40°C, Max.: 140°C

      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.

      Table 7. Engine*4
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Coolant Temp

      Engine coolant temperature/

      Min.: -40°C, Max.: 140°C

      After warming up engine: 75 to 90°C (167 to 194°F)
      • If the value is -40°C (-40°F) or 140°C (284°F), the sensor circuit is open or shorted.

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


      • *1: for 1GR-FE

      • *2: for 1UR-FE

      • *3: for 3UR-FE

      • *4: for 1VD-FTV

      OK
      Engine coolant temperature value displayed on the GTS is almost the same as actual engine coolant temperature.
      Table 8. Result
      Result Proceed to
      OK A
      NG (for Gasoline) B
      NG (for Diesel) C
      Tip:

      *1: Refer to SFI System:


      *2: Refer to ECD System:



    • AClick here
    • B

      GO TO SFI SYSTEM (*1)

    • C

      GO TO ECD SYSTEM (*2)

  5. Click here

    CHECK COMBINATION METER ASSEMBLY


    1. Temporarily replace the combination meter with a new one (Click here).

    2. Check that the operation of the combination meter returns to normal (Click here).

      OK
      Operation of combination meter returns to normal.
      Table 9. Result
      Result Proceed to
      OK A
      NG (for 1GR-FE) B
      NG (for 1UR-FE) C
      NG (for 3UR-FE) D
      NG (for 1VD-FTV) E