METER / GAUGE SYSTEM Tachometer Malfunction

DESCRIPTION

In this circuit, the meter CPU receives engine speed signals from the ECM using the CAN communication system. The meter CPU displays the engine speed, which is calculated based on the data received from the ECM.

WIRING DIAGRAM

A01FD97E07

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Check if a CAN communication DTC is output Click here [for LHD], Click here [for RHD]).

      Result
      Result Proceed to
      CAN communication DTC is not output A
      CAN communication DTC is output (for LHD) B
      CAN communication DTC is output (for RHD) C

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    C

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  2. PERFORM ACTIVE TEST USING GTS (TACHOMETER OPERATION)


    1. Use the Active Test to check the operation of the tachometer Click here.

      Combination Meter
      Tester Display Test Part Control Range Diagnostic Note
      Tacho Meter Operation Tachometer OFF, 0, 1000, 2000, 3000, 4000, 5000, 6000 or 7000 (rpm) Confirm that the vehicle is stopped with the engine idling.
      OK
      Tachometer indication is normal.

    NG

    REPLACE COMBINATION METER ASSEMBLY Click here

    OK

  3. READ VALUE USING GTS (ENGINE RPM)


    1. Use the Data List to check the engine speed Click here.

      Combination Meter
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Engine Rpm Engine speed/Min.: 0 rpm, Max.: 12750 rpm Actual engine speed -
      OK
      Engine speed displayed on the GTS is almost the same as the tachometer indication.

    2. Record the engine speed displayed on the GTS.

      Tech Tips

      Check the engine speed when the engine is fully warmed up and the air conditioning and all electrical accessories are off.


    NG

    REPLACE COMBINATION METER ASSEMBLY Click here

    OK

  4. READ VALUE USING GTS (ENGINE SPEED)


    1. Use the Data List to check the engine speed Click here.

      Engine and ECT
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Engine Speed Engine speed/Min.: 0 rpm, Max.: 16383 rpm 600 to 700 rpm: When idling -
      OK
      Engine speed displayed on the GTS is almost the same as the previously recorded value displayed on the GTS (Body Electrical / Combination Meter / Data List / Engine Rpm).
      Result
      Result Proceed to
      OK A
      NG (2GR-FSE) B
      NG (4GR-FSE) C

    B

    GO TO SFI SYSTEM Click here

    C

    GO TO SFI SYSTEM Click here

    A

  5. CHECK COMBINATION METER ASSEMBLY


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

      OK
      The operation of the tachometer returns to normal.
      Result
      Result Proceed to
      OK A
      NG (2GR-FSE) B
      NG (4GR-FSE) C

    B

    REPLACE ECM Click here

    C

    REPLACE ECM Click here

    A

    END (COMBINATION METER ASSEMBLY WAS DEFECTIVE)