METER / GAUGE SYSTEM Tachometer Malfunction

DESCRIPTION

The combination meter assembly controls the tachometer in accordance with the engine speed signals from the ECM through the CAN communication system.

WIRING DIAGRAM

A004JZ0E03
*1 CAN Communication Line
*2 COMBINATION METER ASSEMBLY

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Check if CAN communication DTCs are output Click here.

      Result
      Result Proceed to
      DTCs are not output A
      DTCs are output B

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  2. PERFORM ACTIVE TEST USING GTS (TACHOMETER OPERATION)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Combination Meter / Active Test.

    5. According to the display on the tester, perform the Active Test.

      Combination Meter
      Tester Display Test Part Control Range Diagnostic Note
      Tachometer Operation Tachometer 0, 1000, 2000, 3000, , 4000, 5000, 6000, 7000 rpm -
      OK
      The engine speed displayed on the tester is approximately the same as that of the tachometer reading.

    NG

    REPLACE COMBINATION METER ASSEMBLY Click here

    OK

  3. READ VALUE USING GTS (ENGINE RPM)


    1. Connect the GTS to the DLC3.

    2. Start the engine.

    3. Turn the GTS on.

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

    5. According to the display on the tester, read the Data List.

      Combination Meter
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Engine Rpm

      Engine speed

      Min.: 0

      Max.: 12750

      		 Approximately same as actual engine speed (when engine is running) Unit: rpm
      OK
      The engine speed displayed on the tester is approximately the same as that displayed on the combination meter assembly.

      Note

      Determine whether the value displayed on the tester is within the acceptable range by referring to the reference values described in "On-Vehicle Inspection" Click here.


    NG

    REPLACE COMBINATION METER ASSEMBLY Click here

    OK

  4. CHECK SFI SYSTEM


    1. Check if the SFI system outputs DTCs Click here.

      Result
      Result Proceed to
      DTCs are not output A
      DTCs are output B

    B

    GO TO SFI SYSTEM Click here

    A

  5. READ VALUE USING GTS (ENGINE SPEED)


    1. Connect the GTS to the DLC3.

    2. Start the engine.

    3. Turn the GTS on.

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

    5. According to the display on the tester, read the Data List.

      Combination Meter
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Engine Speed

      Engine speed

      Min.: 0

      Max.: 16383.75

      		 Approximately same as actual engine speed (when engine is running) Unit: rpm
      OK
      The engine speed displayed on the tester is approximately the same as that displayed on the combination meter assembly.

      Note

      Determine whether the value displayed on the tester is within the acceptable range by referring to the reference values described in "On-Vehicle Inspection" Click here.


    NG

    GO TO SFI SYSTEM Click here

    OK

  6. REPLACE COMBINATION METER ASSEMBLY


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

      OK
      The operation of the tachometer returns to normal.

    OK

    END

    NG

    REPLACE ECM Click here