METER / GAUGE SYSTEM Tachometer Malfunction

DESCRIPTION

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

WIRING DIAGRAM

B001D2OE03
*1 Combination Meter Assembly
*2 CAN Communication Line

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Check if a CAN communication DTC is output.


      1. w/ Central Gatway ECU Click here.

      2. w/o Central Gatway ECU Click here.

        Result
        Result Proceed to
        CAN communication DTC is not output. A
        CAN communication DTC is output. (w/ Central Gatway ECU) B
        CAN communication DTC is output. (w/o Central Gatway ECU) C

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    C

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  2. PERFORM ACTIVE TEST USING GTS (TACHO METER OPERATION)


    1. Using the GTS, perform the Active Test 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) -

      • *: for 1GR-FE, 2TR-FE

        OK
        Tachometer indication is normal.
      Result
      Result Proceed to
      CAN communication DTC is not output. A
      CAN communication DTC is output. (w/ Central Gatway ECU) B
      CAN communication DTC is output. (w/o Central Gatway ECU) C

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    C

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  3. READ VALUE USING GTS (ENGINE RPM)


    1. Using the GTS, read the Data List Click here.

      Combination Meter
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Engine Rpm Engine speed/Min.: 0 rpm, Max.: 12750 rpm 600 to 700 rpm (When idling) If the data received from the ECM exceeds the range that can be displayed on the meter, the meter continues to display the maximum value of the range.
      OK
      Engine speed displayed on the intelligent tester is almost the same as the tachometer indication.

    2. Record the engine speed displayed on the intelligent tester.

      Tech Tips

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


    OK

    REPLACE COMBINATION METER ASSEMBLY Click here

    NG

  4. READ VALUE USING GTS (ENGINE SPEED)


    1. Using the GTS, read the Data List 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 GTS is almost same as actual engine speed.
      Result
      Result Proceed to
      OK A
      NG (for Gasoline Engine) B
      NG (for Diesel Engine) C

      Tech Tips


      • for 1GR-FE:

        If it is necessary to refer to the SFI system, refer to the following procedures Click here.

      • for 2TR-FE:

        If it is necessary to refer to the SFI system, refer to the following procedures Click here.

      • for 1KD-FTV:

        If it is necessary to refer to the ECD system, refer to the following procedures Click here.

      • for 1GD-FTV:

        If it is necessary to refer to the ECD system, refer to the following procedures Click here.

      • for 1GD-FTV (w/ Urea SCR System):

        If it is necessary to refer to the ECD system, refer to the following procedures Click here.

      • for 5L-E:

        If it is necessary to refer to the ECD system, refer to the following procedures Click here.


    B

    GO TO SFI SYSTEM for 1GR-FE: Click here
    GO TO SFI SYSTEM for 2TR-FE: Click here

    C

    GO TO ECD SYSTEM for 1KD-FTV: Click here
    GO TO ECD SYSTEM for 1GD-FTV: Click here
    GO TO ECD SYSTEM for 1GD-FTV (w/ Urea SCR System): Click here
    GO TO ECD SYSTEM for 5L-E: Click here

    A

  5. CHECK ECM


    1. Replace the ECM with a new or normally functioning one.


    2. Check that the operation of the tachometer returns to normal.

      OK
      The operation of the tachometer returns to normal.

    OK

    END (ECM IS DEFECTIVE)

    NG

    REPLACE COMBINATION METER ASSEMBLY Click here