METER / GAUGE SYSTEM Tachometer Malfunction

DESCRIPTION

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

WIRING DIAGRAM

B005BFWE14
*1 Combination Meter Assembly
*2 CAN Communication Line

CAUTION / NOTICE / HINT

Note

When replacing the combination meter assembly, make sure to replace it with a new one.

PROCEDURE


  1. CHECK FOR DTC (CAN COMMUNICATION SYSTEM)


    1. Check if CAN communication DTCs are output.

      Click here

      OK
      CAN communication DTCs are not output.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO CAN COMMUNICATION SYSTEM Click here

    OK

  2. CHECK FOR DTC (SFI SYSTEM)


    1. Check for DTCs.

      for 8AR-FTS (w/ Canister Pump Module): Click here

      for 8AR-FTS (w/o Canister Pump Module): Click here

      for 3ZR-FAE: Click here


      Powertrain > Engine > Trouble Codes
      Powertrain > Engine and ECT > Trouble Codes
      OK
      No DTCs are output.
      Result
      Result Proceed to
      OK A
      NG (for 8AR-FTS [w/ Canister Pump Module]) B
      NG (for 8AR-FTS [w/o Canister Pump Module]) C
      NG (for 3ZR-FAE) D

    B

    GO TO SFI SYSTEM Click here

    C

    GO TO SFI SYSTEM Click here

    D

    GO TO SFI SYSTEM Click here

    A

  3. PERFORM ACTIVE TEST USING GTS (TACHOMETER OPERATION)


    1. Using the GTS, perform the Active Test.

      Click here


      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 or 7000 (rpm) -

      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 SPEED, ENGINE RPM)


    1. Using the GTS, read the Data List.

      Click here


      Powertrain > Engine > Data List
      Tester Display Measurement Item Normal Condition Reference Value Diagnostic Note
      Engine Speed Engine speed Min.: 0 rpm, Max.: 16383 rpm Actual engine speed for 8AR-FTS

      Powertrain > Engine and ECT > Data List
      Tester Display Measurement Item Normal Condition Reference Value Diagnostic Note
      Engine Speed Engine speed Min.: 0 rpm, Max.: 16383 rpm Actual engine speed for 3ZR-FAE

      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 Actual engine speed -

      Powertrain > Engine > Data List
      Tester Display
      Engine Speed

      Powertrain > Engine and ECT > Data List
      Tester Display
      Engine Speed

      Body Electrical > Combination Meter > Data List
      Tester Display
      Engine Rpm

      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.

      OK
      The Data List values of the ECUs do not match.
      Result
      Result Proceed to
      OK A
      NG (for 8AR-FTS) B
      NG (for 3ZR-FAE) C

    B

    REPLACE ECM Click here

    C

    REPLACE ECM Click here

    A

  5. CHECK COMBINATION METER ASSEMBLY


    1. Replace the combination meter assembly.

      Click here

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

      OK
      The operation of the tachometer returns to normal.
      Result
      Result Proceed to
      OK A
      NG (for 8AR-FTS) B
      NG (for 3ZR-FAE) C

    A

    END (COMBINATION METER ASSEMBLY IS DEFECTIVE)

    B

    REPLACE ECM Click here

    C

    REPLACE ECM Click here