METER / GAUGE SYSTEM Tachometer Malfunction

DESCRIPTION

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

WIRING DIAGRAM

B0067JDE85
*1 Combination Meter Assembly (Meter Circuit Plate)
*2 CAN Communication Line

CAUTION / NOTICE / HINT

Note

Before replacing the ECM, refer to Service Bulletin.

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. READ VALUE USING GTS (ENGINE RPM)


    1. Connect the GTS to the DLC3.

    2. Turn the engine 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 malfunction of the ECM 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

  3. CHECK FOR DTC


    1. Check if SFI system DTCs are output.

      SFI system (w/ Canistor Pump Module): Click here

      SFI system (w/o Canistor Pump Module): Click here


      Powertrain > Engine > Trouble Codes
      Result
      Result Proceed to
      SFI system DTCs are not output. A
      SFI system DTCs are output. B

    B

    GO TO SFI SYSTEM SFI system (w/ Canister Pump Module): Click here
    GO TO SFI SYSTEM SFI system (w/o Canister Pump Module): Click here

    A

  4. READ VALUE USING GTS (ENGINE SPEED, ENGINE RPM)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus:


      1. for Engine: Powertrain / Engine / 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. Engine


        Powertrain > Engine > Data List
        Tester Display Measurement Item Range Normal Condition Reference Value Diagnostic Note
        Engine Speed Engine speed Min.: 0 rpm, Max.: 16383 rpm 700 to 800 rpm: Idling with warm engine Idling (engine warmed up and A/C off): 763 rpm When the crankshaft position sensor is malfunctioning, "Engine Speed" is approximately 0 rpm or varies greatly from the actual engine speed.

        Powertrain > Engine > Data List
        Tester Display
        Engine Speed

      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 ECM is suspected.

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


    B

    REPLACE ECM Click here

    A

  5. 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 ECM Click here