Last Modified: 06-05-2026 6.11:8.1.0 Doc ID: RM100000001H78Q
Model Year Start: 2020 Model: Corolla HV Prod Date Range: [01/2019 - 09/2022]
Title: POWER ASSIST SYSTEMS: POWER STEERING SYSTEM (for HV Model): CALIBRATION; 2020 - 2022 MY Corolla HV [01/2019 - 09/2022]

CALIBRATION

1. POWER STEERING ECU INITIAL SETTING (TORQUE SENSOR ZERO POINT CALIBRATION AND ASSIST MAP WRITING) (USING TECHSTREAM)

NOTICE:

If any of the following conditions are met, perform Power Steering ECU Initial Setting (torque sensor zero point calibration and assist map writing):

  • The power steering ECU with motor 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 (torque sensor zero point calibration and assist map writing).

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

(2) Turn the power switch off.

(3) Connect the Techstream to the DLC3.

(4) Turn the power switch on (IG).

(5) Turn the Techstream on.

(6) Enter the following menus: Chassis / EMPS / Utility / Power Steering ECU Initial Setting.

Chassis > EMPS > Utility

NOTICE:

  • 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.

(7) Check for RoBs.

Click here 2020 - 2022 MY Corolla HV [01/2019 - 09/2022]; POWER ASSIST SYSTEMS: POWER STEERING SYSTEM (for HV Model): VEHICLE CONTROL HISTORY

Chassis > EMPS > Utility

NOTICE:

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