METER / GAUGE SYSTEM Speedometer Malfunction

DESCRIPTION

The meter ECU receives vehicle speed signals from the skid control ECU via the CAN communication system. The speed sensor detects the wheel speed and sends the appropriate signals to the skid control ECU. The skid control ECU supplies power to the vehicle speed sensor. The skid control ECU detects vehicle speed signals based on the pulses of the voltage.

Tech Tips


  • Factors that affect the indicated vehicle speed include tire size, tire inflation, and tire wear. The speed indicated on the speedometer has an allowable margin of error. This can be tested using a intelligent tester. For details about testing and the margin of error, see the reference chart Click here.

  • If the vehicle speed sensor circuit has a malfunction, the skid control ECU stores the DTCs. Troubleshoot the Brake Control System Click here.

WIRING DIAGRAM

A01EXADE62

INSPECTION PROCEDURE

Note

If the vehicle speed is outside the allowable range when tested, perform the on-vehicle inspection Click here.

Tech Tips

Before starting the following inspection, check tire size and tire air pressure.

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Check if a CAN communication DTC is output Click here.

      Result
      Result Proceed to
      CAN communication DTC is not output. A
      CAN communication DTC is output. B

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  2. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (SPEED METER OPERATION)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch ON.

    3. Turn the intelligent tester on.

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

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

      Combination Meter
      Tester Display Test Part Control Range Diagnostic Note
      Speed Meter Operation Speedometer 0, 40, 80, 120, 160, 200, 240 km/h

      There is a deviation in the values displayed on the speedometer

      (Control range → Speedometer display)


      • 40 → 41.7 to 46.2

      • 80 → 83.4 to 88.4

      • 120 → 125.1 to 130.6

      • 160 → 166.2 to 173.2

      • 200 → 207.7 to 215.7
      OK
      Speedometer indication is normal.

    NG

    REPLACE COMBINATION METER ASSEMBLY Click here

    OK

  3. CHECK BRAKE CONTROL SYSTEM


    1. Check if the brake control system output the DTC Click here.

      Result
      Result Proceed to
      The DTC is not output. A
      The DTC is output. B

    B

    GO TO BRAKE CONTROL SYSTEM Click here

    A

  4. READ VALUE USING INTELLIGENT TESTER (VEHICLE SPEED, VEHICLE SPEED METER)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch ON.

    3. Turn the intelligent tester on.

    4. Enter the following menus:


      1. for ABS/VSC/TRC: Chassis / ABS/VSC/TRC / Data List.

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

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

      ABS/VSC/TRC
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Vehicle Speed Vehicle speed/Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph) Vehicle stopped: 0 km/h (0 mph) When driving at constant speed: No large fluctuations
      Combination Meter
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Vehicle Speed Meter Vehicle speed/Min.: 0 km/h (0 mph), Max.: 255 km/h (158 mph) Almost the same as actual vehicle speed -
      Result
      Result Proceed to
      The data list values of the ECUs match. A
      The data list values of the ECUs do not match. B

      Tech Tips


      • When the Data List values of the ECUs match, an internal malfunction of the combination meter assembly is suspected.

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


    B

    REPLACE COMBINATION METER ASSEMBLY Click here

    A

    REPLACE COMBINATION METER ASSEMBLY Click here

  5. REPLACE COMBINATION METER ASSEMBLY


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

      Result
      Result Proceed to
      The operation of the speedometer returns to normal. A
      The operation of the speedometer does not returns to normal. B

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    A

    END