METER / GAUGE SYSTEM Engine Coolant Temperature Receiver Gauge Malfunction

DESCRIPTION

In this circuit, the combination meter assembly receives engine coolant temperature signals from the ECM using the CAN communication line. The combination meter assembly displays the engine coolant temperature, which is calculated based on the data received from the ECM.

WIRING DIAGRAM

A01QSBQE17
*1 Combination Meter Assembly
*2 CAN Communication Line

CAUTION / NOTICE / HINT

Note

When replacing the combination meter assembly, make sure to replace it with a new one.

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


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

      for LHD: Click here

      for RHD: Click here

      Result
      Proceed to
      CAN communication system DTC is not output
      CAN communication system DTC is output (for LHD)
      CAN communication system DTC is output (for RHD)

    CAN communication system DTC is output (for LHD)

    GO TO CAN COMMUNICATION SYSTEM Click here

    CAN communication system DTC is output (for RHD)

    GO TO CAN COMMUNICATION SYSTEM Click here

    CAN communication system DTC is not output

  2. CHECK SFI SYSTEM OR ECD SYSTEM


    • *1: Engine Type Gasoline

    • *2: Engine Type Diesel


    1. Check if a SFI system*1 or ECD system*2 DTC is output.

      ECD system (1AD-FTV):

      ECD system (2AD-FHV):

      ECD system (2AD-FTV [for CCo]):

      ECD system (2AD-FTV [for DPF]): Click here

      SFI system (2AR-FE): Click here

      SFI system (3ZR-FAE): Click here

      SFI system (3ZF-FE): Click here


      Powertrain > Engine and ECT > Trouble Codes
      Result
      Proceed to
      DTC is not output (for Segment Display Type)
      DTC is not output (for Dot Display Type)
      ECD system DTC is output (1AD-FTV)
      ECD system DTC is output (2AD-FHV)
      ECD system DTC is output (2AD-FTV [for CCo])
      ECD system DTC is output (2AD-FTV [for DPF])
      SFI system DTC is output (2AR-FE)
      SFI system DTC is output (3ZR-FAE)
      SFI system DTC is output (3ZR-FE)

    DTC is not output (for Dot Display Type)

    GO TO STEP 4 Click here

    ECD system DTC is output (1AD-FTV)

    GO TO ECD SYSTEM Click here

    ECD system DTC is output (2AD-FHV)

    GO TO ECD SYSTEM Click here

    ECD system DTC is output (2AD-FTV [for CCo])

    GO TO ECD SYSTEM Click here

    ECD system DTC is output (2AD-FTV [for DPF])

    GO TO ECD SYSTEM Click here

    SFI system DTC is output (2AR-FE)

    GO TO SFI SYSTEM Click here

    SFI system DTC is output (3ZR-FAE)

    GO TO SFI SYSTEM Click here

    SFI system DTC is output (3ZR-FE)

    GO TO SFI SYSTEM Click here

    DTC is not output (for Segment Display Type)

  3. PERFORM ACTIVE TEST USING GTS (WATER TEMPERATURE METER OPERATION)


    1. Using the GTS, perform the Active Test.

      Click here


      Body Electrical > Combination Meter > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Water Temperature Meter Operation Engine coolant temperature receiver gauge OFF, LOW, NORMAL or HIGH -

      Body Electrical > Combination Meter > Active Test
      Tester Display
      Water Temperature Meter Operation
      OK
      Engine coolant temperature receiver gauge indication is normal.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE COMBINATION METER ASSEMBLY Click here

    OK

  4. READ VALUE USING GTS (COOLANT TEMPERATURE, COOLANT TEMP)


    1. Using the GTS, read the Data List.

      Click here


      Body Electrical > Combination Meter > Data List
      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: 75 to 100°C (167 to 212°F) -

      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: 215°C (419°F) 60 to 90°C (140 to 194°F): After warming up engine -

      Powertrain > Engine > 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) 60 to 90°C (140 to 194°F): After warming up engine -

      Body Electrical > Combination Meter > Data List
      Tester Display
      Coolant Temperature

      Powertrain > Engine and ECT > Data List
      Tester Display
      Coolant Temp

      Powertrain > Engine > Data List
      Tester Display
      Coolant Temp

      Tech Tips


      • 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.

      Result
      Proceed to
      The Data List values of the ECUs do not match.
      The Data List values of the ECUs match.

    The Data List values of the ECUs do not match.

    REPLACE COMBINATION METER ASSEMBLY Click here

    The Data List values of the ECUs match.

  5. CHECK COMBINATION METER ASSEMBLY


    1. Replace the combination meter assembly with a new or normally functioning one.

      Click here

    2. Check that the operation of the engine coolant temperature receiver gauge returns to normal.

      OK
      The operation of the engine coolant temperature receiver gauge returns to normal.
      Result
      Proceed to
      OK
      NG (1AD-FTV)
      NG (2AD-FHV)
      NG (2AD-FTV)
      NG (2AR-FE)
      NG (3ZR-FAE)
      NG (3ZR-FE)

    OK

    END (COMBINATION METER ASSEMBLY WAS DEFECTIVE)

    NG (1AD-FTV)

    REPLACE ECM Click here

    NG (2AD-FHV)

    REPLACE ECM Click here

    NG (2AD-FTV)

    REPLACE ECM Click here

    NG (2AR-FE)

    REPLACE ECM Click here

    NG (3ZR-FAE)

    REPLACE ECM Click here

    NG (3ZR-FE)

    REPLACE ECM Click here