Inspection [11/2021 - ]: Procedure

READ VALUE USING GTS

Using the GTS, display the following items.

Chassis > Brake Control > Data List

Tester Display
FR Wheel Speed
FL Wheel Speed

Check if the speed indicated on the display changes in the same manner as the speedometer reading during acceleration/deceleration when the steering wheel is in the straight-ahead position.
If the speed indicated on the display does not change in the inspection, check the front speed sensor.

CHECK FRONT SPEED SENSOR

Visually check the tip of the front speed sensor for foreign particles or damage.
If necessary, clean the tip or replace the front speed sensor.
Disconnect the front speed sensor connector.
Check the front speed sensor cable for discontinuity. If defective, replace the front speed sensor.

Connect a 12 V power supply to the No. 1 terminal of the front speed sensor connector, then attach resistance to the No. 2 terminal. Rotate the wheel at about 3 km/h (2 MPH), and measure the voltage using an oscilloscope.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Vehicle stopped state

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard Voltage

0.7 to 1.4 V

Driving condition

Driving condition (enlarged view)

Standard Voltage

0.7 to 2.8 V

Replace the following parts if it is found defective.
- If the output voltage is out of the standard value:
  Replace the magnetic encoder (front axle hub sub-assembly).
- If the output voltage is within standard value:
  Replace the brake actuator assembly.