Toyota Yaris: Power Steering System / Calibration

Toyota Yaris XP210 (2020-2023) Reapir and Service Manual / Steering / Power Assist Systems / Power Steering System / Calibration




If any of the following conditions are met, perform Power Steering ECU Initial Setting (assist map writing):

  • The power steering ECU assembly has been replaced.
  • The electric power steering column sub-assembly has been replaced.
  • There is a difference in steering effort between turning left and right.

(a) Perform Power Steering ECU Initial Setting (assist map writing).

(1) Align the front wheels straight ahead and center the steering wheel.

Chassis > EMPS > Utility

Tester Display

Power Steering ECU Initial Setting


  • Do not turn the steering wheel sharply.
  • During the torque sensor zero point calibration the steering wheel will shudder. Do not touch the steering wheel until at least 3 seconds have elapsed after the shuddering has stopped.

(2) Check for RoBs.

Chassis > EMPS > Utility

Tester Display

Vehicle Control History (RoB)


When Power Steering ECU Initial Setting (assist map writing) are completed, make sure to check for vehicle control history (RoB).

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    Break-In Period

    No special break-in is necessary, but a few precautions in the first 600 miles (1,000 km) may add to the performance, economy, and life of the vehicle.

    Do not race the engine. Do not maintain one constant speed, either slow or fast, for a long period of time. Do not drive constantly at full-throttle or high engine rpm for extended periods of time. Avoid unnecessary hard stops. Avoid full-throttle starts.

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