METER / GAUGE SYSTEM Malfunction in Water Temperature Warning Light

DESCRIPTION

In this circuit, the meter CPU receives engine coolant temperature signals from the ECM using the CAN communication system (CAN V1 Bus). The meter CPU displays engine coolant temperature that is calculated based on the data received from the ECM.

WIRING DIAGRAM

B00477WE99
*1 CAN Communication Line
*2 Combination Meter Assembly

CAUTION / NOTICE / HINT

Tech Tips

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


PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Check if a CAN communication system DTC is output.


      Result
      Result Proceed to
      CAN communication DTC is not output A
      DTC is output (w/o Toyota Safety Sense) B
      DTC is output (w/ Toyota Safety Sense) C

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    C

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  2. PERFORM ACTIVE TEST USING GTS (COOLANT TEMP)


    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 / Combination Meter / Active Test.

    5. According to the display on the GTS, perform the Active Test.

      Combination Meter
      Tester Display Test Part Control Range Diagnostic Note
      Indicat. Lamp Coolant Cool Engine coolant temperature indicator light OFF/ON Vehicle is stopped and engine is idling
      Indicat. Lamp Coolant Hot Engine coolant temperature warning light OFF/ON Vehicle is stopped and engine is idling
      OK
      Value selected during Active Test is displayed.

    NG

    REPLACE COMBINATION METER ASSEMBLY Click here

    OK

  3. READ VALUE USING GTS (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: Body / Combination Meter / Data List.

    5. According to the display on the GTS, read the Data List.

      Combination Meter
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Coolant Temperature

      Engine coolant temperature/

      Min.: 0 (32)

      Max.: 127.5 (261.5)

      After warming up:

      80 to 100 (176 to 212)

      		 Unit: °C (°F)
      OK
      Vehicle's coolant temperature and tester value are the same.

    NG

    REPLACE COMBINATION METER ASSEMBLY Click here

    OK

  4. CHECK ENGINE CONTROL SYSTEM


    1. Check if an engine control DTC is output.


      Result
      Result Proceed to
      Engine control DTC is not output A
      Engine control DTC is output (for 2NR-FKE) B
      Engine control DTC is output (for 1KR-FE) C
      Engine control DTC is output (for 1ND-TV with DPF) D
      Engine control DTC is output (for 1ND-TV without DPF) E

    A

    REPLACE COMBINATION METER ASSEMBLY Click here

    B

    GO TO SFI SYSTEM Click here

    C

    GO TO SFI SYSTEM Click here

    D

    GO TO ECD SYSTEM Click here

    E

    GO TO ECD SYSTEM Click here