METER / GAUGE SYSTEM Tachometer Malfunction

DESCRIPTION

In this circuit, the combination meter assembly receives engine speed signals from the Hybrid vehicle control ECU assembly via the CAN communication system. The combination meter assembly displays the engine speed calculated based on the data received from the Hybrid vehicle control ECU assembly.

WIRING DIAGRAM

B004FK6E17
*1 Hybrid Vehicle Control ECU Assembly
*2 Combination Meter Assembly
*3 CAN Communication Line

CAUTION / NOTICE / HINT

Tech Tips

Active Test cannot be performed on the tachometer for TFT meter type.

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Check if CAN communication DTCs are output.

      Click here

      Result
      Result Proceed to
      CAN communication DTCs are not output. A
      CAN communication DTCs are output. B

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  2. CONFIRM MODEL


    1. Confirm the vehicle type.

      Result
      Result Proceed to
      for Optitron Meter Type A
      for TFT Meter Type B

    B

    GO TO STEP 4 Click here

    A

  3. PERFORM ACTIVE TEST USING GTS (TACHOMETER OPERATION)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    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
      TachoMeter Operation Tachometer OFF, 0, 1000, 2000, 3000, 4000, 5000, 6000, 7000 -

      Body Electrical > Combination Meter > Active Test
      Tester Display
      TachoMeter Operation
      OK
      Tachometer indication is normal.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE COMBINATION METER ASSEMBLY Click here

    OK

  4. READ VALUE USING GTS (ENGINE RPM)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

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

    5. Read the Data List according to the display on the GTS.


      Body Electrical > Combination Meter > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Engine Rpm Engine speed Min.: 0 rpm, Max.: 12750 rpm Almost the same as actual tachometer -

      Body Electrical > Combination Meter > Data List
      Tester Display
      Engine Rpm
      OK
      Engine speed displayed on the GTS is almost the same as the tachometer indication.

      Tech Tips


      • When the Data List values and tachometer values match, a signal output error of the hybrid vehicle control ECU assembly or an internal malfunction of the combination meter assembly is suspected.

      • When the Data List values and tachometer values do not match, an internal malfunction of the combination meter assembly is suspected.

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE COMBINATION METER ASSEMBLY Click here

    OK

  5. CHECK FOR DTC


    1. Check if hybrid control system DTCs are output.

      Click here


      Powertrain > Hybrid Control > Trouble Codes
      Result
      Result Proceed to
      Hybrid control system DTCs are not output. A
      Hybrid control system DTCs are output. B

    B

    GO TO HYBRID CONTROL SYSTEM Click here

    A

  6. READ VALUE USING GTS (ENGINE REVOLUTION, ENGINE RPM)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus:


      1. for Engine: Powertrain / Hybrid Control / Data List.

      2. for Combination Meter: Body Electrical / Combination Meter / Data List.

    5. Read the Data List according to the display on the GTS.


      1. Hybrid Control


        Powertrain > Hybrid Control > Data List
        Tester Display Measurement Item Normal Condition Reference Value Diagnostic Note
        Engine Revolution Engine speed -

        While idling after the engine is warmed up and in inspection mode:

        Approximately 900 rpm

        While driving at a constant speed:

        No significant fluctuation

        		 -

        Powertrain > Hybrid Control > Data List
        Tester Display
        Engine Revolution

      2. Combination Meter


        Body Electrical > Combination Meter > Data List
        Tester Display Measurement Item Range Normal Condition Diagnostic Note
        Engine Rpm Engine speed Min.: 0 rpm, Max.: 12750 rpm Almost the same as actual tachometer -

        Body Electrical > Combination Meter > Data List
        Tester Display
        Engine Rpm
      Result
      Result Proceed to
      The data list values of the ECUs do not match. A
      The data list values of the ECUs match. B

      Tech Tips


      • When the Data List values of the ECUs match, an internal malfunction of the hybrid vehicle control ECU assembly is suspected.

      • When the Data List values of the ECUs do not match, a signal output error of the hybrid vehicle control ECU assembly or an internal malfunction of the combination meter assembly is suspected.


    B

    REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY Click here

    A

  7. REPLACE COMBINATION METER ASSEMBLY


    1. Replace the combination meter assembly with a new or known good one.

      Click here

      OK
      The operation of the tachometer returns to normal.
      Result
      Proceed to
      OK
      NG

    OK

    END

    NG

    REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY Click here