METER / GAUGE SYSTEM Tachometer Malfunction

DESCRIPTION

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

WIRING DIAGRAM

B003XR5E85
*1 Combination Meter Assembly (Meter Circuit Plate)
*2 CAN Communication Line

CAUTION / NOTICE / HINT

Tech Tips

Active Test cannot be performed on the tachometer for F SPORT models.

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
      except F SPORT models A
      for F SPORT models 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. Check the operation by referring to the table below.


      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. Check the values by referring to the table below.


      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 600 to 700 rpm: Idling -

      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 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

  5. CHECK FOR DTC


    1. Check if SFI system DTCs are output.

      Click here


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

    B

    GO TO SFI SYSTEM for 2AR-FSE (w/ EGR System): Click here
    GO TO SFI SYSTEM for 2AR-FSE (w/o EGR System): Click here

    A

  6. READ VALUE USING GTS (ENGINE SPEED, 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 / Engine and ECT / Data List.

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

    5. Check the values by referring to the table below.


      1. Engine and ECT


        Powertrain > Engine and ECT > Data List
        Tester Display Measurement Item Range Normal Condition Diagnostic Note
        Engine Speed Engine speed Min.: 0 rpm, Max.: 16383 rpm 600 to 700 rpm: Idling

        • Stored as freeze frame data: Yes

        • When the crankshaft position sensor is malfunctioning, "Engine Speed" is approximately 0 rpm or varies greatly from the actual engine speed.

        Powertrain > Engine and ECT > 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 600 to 700 rpm: Idling -

        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 error of the ECM or an internal malfunction of the combination meter assembly is suspected.


    B

    REPLACE ECM 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 ECM Click here