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 electronically controlled brake system.

    Click here

WIRING DIAGRAM

B000W2CE31
*1 Speed Signal
*2 Skid Control ECU Assembly
*3 Combination Meter Assembly
*4 CAN Communication Line

CAUTION / NOTICE / HINT

Note


  • If the vehicle speed is outside the allowable range when tested, perform the operation check.

    Click here

  • When replacing the combination meter assembly, always replace it with a new one. If a combination meter assembly which was installed to another vehicle is used, the information stored in it will not match the information from the vehicle and a DTC may be stored.

Tech Tips

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

PROCEDURE


  1. CHECK FOR DTC


    1. Check for DTCs.

      Click here

      Result
      Result Proceed to
      DTCs are not output. A
      DTCs are output. B

    B

    GO TO DIAGNOSTIC TROUBLE CODE CHART Click here

    A

  2. CHECK FOR DTC (ELECTRONICALLY CONTROLLED BRAKE SYSTEM)


    1. Check for DTCs.

      Click here

      Result
      Result Proceed to
      DTCs are not output. A
      DTCs are output. B

    B

    ELECTRONICALLY CONTROLLED BRAKE SYSTEM Click here

    A

  3. READ VALUE USING GTS (VEHICLE SPEED METER)


    1. Using the GTS, read the Data List.

      Click here


      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

      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 brake booster with master cylinder assembly (skid control ECU) or an internal malfunction of the combination meter assembly is suspected.

      OK
      Vehicle speed displayed on the GTS is almost the same as the actual vehicle speed measured using a speedometer tester (calibrated chassis dynamometer).
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here

    NG

  4. READ VALUE USING GTS (VEHICLE SPEED)


    1. Using the GTS, read the Data List.

      Click here


      Chassis > ABS/VSC/TRC > Data List
      Tester Display Measurement Item Normal Condition Reference Value Diagnostic Note
      Vehicle Speed Vehicle speed Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph) Almost the same as actual vehicle speed -

      Chassis > ABS/VSC/TRC > Data List
      Tester Display
      Vehicle Speed
      OK
      Vehicle speed displayed on the GTS is almost the same as the actual vehicle speed measured using a speedometer tester (calibrated chassis dynamometer).
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here

    NG

    REPLACE SKID CONTROL ECU ASSEMBLY for LHD Click here for RHD Click here