Variable Gear Ratio Steering System (Initialization)

STEERING ANGLE SENSOR INITIALIZATION (to obtain a tire angle (during straight-ahead driving) signal)
1. Turn the power switch ON (IG), and check that the master warning light illuminates for a few seconds.
  
  Fig 1: Identifying Master Warning Light
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  NOTE:
  If the warning light remains on or blinks, repair the applicable system.
2. Drive the vehicle on a straight road at 35 km/h (22 mph) or more for 5 seconds or longer.
  HINT:
  - At this point, the steering wheel will still remain off-center by 5 to 10°.
  - In this step, the neutral position of the steering wheel is restored from the steering control ECU memory.
3. Confirm that steering angle sensor initialization is completed (using the Techstream).
  1. Enter the VGRS menu using the Techstream. Select "Straight Angle Valid Flag" from "Data List". Check if the steering angle sensor has obtained a tire angle (during straight-ahead driving) signal.
    Standard
    
    "Valid" is displayed on the Techstream screen.
4. Confirm that steering angle sensor initialization is completed (not using the Techstream).
  1. Stop the vehicle (power switch turned to ON (READY)).
  2. Slowly turn the steering wheel from lock to lock.
  3. If it turns approximately 2.7 turns, steering angle sensor initialization is completed. If it turns approximately 3.2 turns, steering angle sensor initialization is not completed.
    NOTE:
    If the steering wheel turns approximately 3.2 turns, drive the vehicle on a straight road at 35 km/h (22 mph) or more for 5 seconds or longer. Then confirm the initialization again.