METER / GAUGE SYSTEM Engine Coolant Temperature Receiver Gauge Malfunction

DESCRIPTION

In this circuit, the meter CPU receives engine coolant temperature signals from the ECM. The meter CPU displays engine coolant temperature that is calculated based on the data received from the ECM.

WIRING DIAGRAM

A01DTNVE01
A01DRQBE01

INSPECTION PROCEDURE

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 or ECD System.


PROCEDURE


  1. CHECK ENGINE


    1. Check the engine type.

      Engine type
      Engine type Proceed to
      not 5L-E A
      5L-E B

    B
    A
  2. CHECK CAN COMMUNICATION SYSTEM


    1. Check if a CAN communication DTC is output.


      1. for LHD with Entry and Start System Click here.

      2. for LHD without Entry and Start System Click here.

      3. for RHD with Entry and Start System Click here.

      4. for RHD without Entry and Start System Click here.

        Result
        Result Proceed to
        CAN communication DTC is not output. A
        CAN communication DTC is output. (for LHD with Entry and Start System) B
        CAN communication DTC is output. (for LHD without Entry and Start System) C
        CAN communication DTC is output. (for RHD with Entry and Start System) D
        CAN communication DTC is output. (for RHD without Entry and Start System) E

    B
    C
    D
    E
    A
  3. READ VALUE USING INTELLIGENT TESTER (COOLANT TEMPERATURE)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the intelligent tester on.

    4. Enter the following menus: Body Electrical / Combination Meter / Data List.

    5. Check the values by referring to the table below.

      Combination Meter
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Coolant Temperature Engine coolant temperature/0 to 127.5°C (0 to 261.5°F) After warming up: 80 to 95°C (176 to 203°F)
      • If -40°C (-40°F): Sensor circuit open

      • If 140°C (284°F) or more: Sensor circuit shorted

      OK
      Engine coolant temperature value displayed on the intelligent tester is almost the same as the engine coolant temperature receiver gauge indication.
    6. Record the temperature displayed on the intelligent tester.


    NG
    OK
  4. READ VALUE USING INTELLIGENT TESTER (COOLANT TEMP)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the intelligent tester on.

    4. Enter the following menus: Powertrain / Engine and ECT / Data List.

    5. Check the values by referring to the table below.

      Engine and ECT
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Coolant Temp Engine coolant temperature/Min.: -40°C (-40°F), Max.: 215°C (419°F) After warming up: 80 to 100°C (176 to 212°F) -
      OK
      Engine coolant temperature value displayed on the intelligent tester is almost the same as the previously recorded intelligent tester indication (Body Electrical / Combination Meter / Data List / Coolant Temperature).
      Result
      Result Proceed to
      OK A
      NG (for 1GR-FE) B
      NG (for 2TR-FE) C
      NG (for 1KD-FTV) D

    B
    C
    D
    A
  5. READ VALUE USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the intelligent tester on.

    4. Enter the following menus: Body Electrical / Combination Meter / Data List.

    5. Check the values by referring to the table below.

      Combination Meter
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Coolant Temperature Engine coolant temperature/0 to 127.5°C (0 to 261.5°F) After warming up: 80 to 95°C (176 to 203°F)
      • If -40°C (-40°F): Sensor circuit open

      • If 140°C (284°F) or more: Sensor circuit shorted

      OK
      Engine coolant temperature value displayed on the intelligent tester is almost the same as the engine coolant temperature receiver gauge indication.
    6. Record the temperature displayed on the intelligent tester.


    NG
    OK
  6. READ VALUE USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the intelligent tester on.

    4. Enter the following menus: Powertrain / Engine and ECT / Data List.

    5. Check the values by referring to the table below.

      Engine and ECT
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Coolant Temp Engine coolant temperature/Min.: -40°C (-40°F), Max.: 215°C (419°F) After warming up: 80 to 100°C (176 to 212°F) -
      OK
      Engine coolant temperature value displayed on the intelligent tester is almost the same as the previously recorded intelligent tester indication (Body Electrical / Combination Meter / Data List / Coolant Temperature).

    NG
    OK