METER / GAUGE SYSTEM Speedometer Malfunction

DESCRIPTION

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

Tech Tips


  • Factors that affect the indicated vehicle speed include the tire size, tire inflation, and tire wear. The speed indicated on the speedometer has an allowable margin of error. This can be tested using the GTS. 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 brake actuator assembly (skid control ECU) stores DTCs. Troubleshoot the vehicle stability control system.

    Click here

WIRING DIAGRAM

B002DI4E01
*1 Brake Actuator Assembly (Skid Control ECU)
*2 CAN Communication Line
*3 Combination Meter Assembly

CAUTION / NOTICE / HINT

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 CAN communication DTCs are output.

      for LHD: Click here

      for RHD: 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 for LHD: Click here
    GO TO CAN COMMUNICATION SYSTEM for RHD: Click here

    A

  2. PERFORM ACTIVE TEST USING GTS (SPEED METER OPERATION)


    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 / Active Test.

    5. Perform the Active Test according to the display on the GTS.


      Body Electrical > Combination Meter > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Speed Meter Operation Speedometer

      • OFF, 0, 40, 80, 120, 160, 200 mph*1

      • OFF, 0, 40, 80, 120, 160, 200, 240, 280 km/h*2

      There is a deviation in the values displayed on the speedometer (Control range → Speedometer display)

      (1) for Gauge speedometer


        Reference mph (for Fuel Receiver Gauge Scale R to 1/1 Type) mph*1:

      • 40 → 42.0 to 44.5

      • 80 → 83.1 to 87.1

      • 120 → 124.7 to 129.6

      • 160 → 166.2 to 171.9

      • 200 → 207.8 to 214.2


        Reference km/h (for Fuel Receiver Gauge Scale R to 1/1 Type) km/h*2:

      • 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

      • 240 → 249.2 to 258.0

      • 280 → 290.6 to 300.4


        Reference km/h (for Fuel Receiver Gauge Scale E to F Type) km/h*2:

      • 40 → 41.4 to 45.9

      • 80 → 82.8 to 87.8

      • 120 → 124.1 to 129.1

      • 160 → 165.5 to 170.5

      • 200 → 206.9 to 211.9

      • 240 → 248.3 to 253.3

      • 280 → 289.6 to 294.6

      (2) for Digital speedometer


        Reference mph*1:

      • 40 → 42.0 to 44.5

      • 80 → 83.1 to 87.1

      • 120 → 124.7 to 129.6

      • 160 → 166.2 to 171.9

      • 200 → 207.8 to 214.2


        Reference km/h*2:

      • 40 → 42.0 to 46.0

      • 80 → 84.0 to 88.0

      • 120 → 125.0 to 130.0

      • 160 → 167.0 to 173.0

      • 200 → 208.0 to 215.0

      • 240 → 249.0 to 257.0

      • 280 → 291.0 to 299.0

      • *1: for Speedometer with Imperial Units for Main Scale

      • *2: for Speedometer with Metric Units for Main Scale


      Body Electrical > Combination Meter > Active Test
      Tester Display
      Speed Meter Operation
      OK
      Speedometer indication is normal.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE COMBINATION METER ASSEMBLY Click here

    OK

  3. CHECK FOR DTC


    1. Check if vehicle stability control system DTCs are output.

      Click here


      Chassis > ABS/VSC/TRAC > Trouble Codes
      Result
      Result Proceed to
      Vehicle stability control system DTCs are not output. A
      Vehicle stability control system DTCs are output. B

    B

    GO TO VEHICLE STABILITY CONTROL SYSTEM Click here

    A

  4. READ VALUE USING GTS (VEHICLE SPEED, VEHICLE SPEED METER)


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

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

    5. Read the Data List according to the display on the GTS.


      Chassis > ABS/VSC/TRC > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Vehicle Speed Maximum wheel speed sensor reading 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

      Chassis > ABS/VSC/TRC > Data List
      Tester Display
      Vehicle Speed

      Body Electrical > Combination Meter > Data List
      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 -

      Body Electrical > Combination Meter > Data List
      Tester Display
      Vehicle Speed Meter
      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 malfunction of the brake actuator assembly (skid control ECU) or an internal malfunction of the combination meter assembly is suspected.


    A

    REPLACE COMBINATION METER ASSEMBLY Click here

    B

  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 speedometer returns to normal.
      Result
      Proceed to
      OK
      NG

    OK

    END

    NG

    REPLACE BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU) for LHD: Click here
    REPLACE BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU) for RHD: Click here