| Last Modified: 05-13-2024 | 6.11:8.1.0 | Doc ID: RM1000000025783 |
| Model Year Start: 2023 | Model: GR Corolla | Prod Date Range: [09/2022 - ] |
| Title: POWER ASSIST SYSTEMS: POWER STEERING SYSTEM (for Gasoline Model): CALIBRATION; 2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [09/2022 - ] | ||
CALIBRATION
POWER STEERING ECU INITIAL SETTING (TORQUE SENSOR ZERO POINT CALIBRATION AND ASSIST MAP WRITING) (for Type A)
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 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 ignition switch off.
(3) Connect the Techstream to the DLC3.
(4) Turn the ignition switch to ON.
(5) Turn the Techstream on.
(6) Enter the following menus: Chassis / EMPS / Utility / Power Steering ECU Initial Setting.
Chassis > EMPS > Utility
|
Tester Display |
|---|
|
Power Steering ECU Initial Setting |
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
![2023 MY Corolla Corolla Hatchback GR Corolla [09/2022 - 11/2022]; POWER ASSIST SYSTEMS: POWER STEERING SYSTEM (for Gasoline Model): VEHICLE CONTROL HISTORY](/t3Portal/stylegraphics/info.gif)
Chassis > EMPS > Utility
|
Tester Display |
|---|
|
Vehicle Control History (RoB) |
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).
POWER STEERING ECU INITIAL SETTING (ASSIST MAP WRITING) (for Type B)
NOTICE:
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.
(a) Perform Power Steering ECU Initial Setting (assist map writing).
(1) Align the front wheels straight ahead and center the steering wheel.
(2) Turn the ignition switch off.
(3) Connect the GTS to the DLC3.
(4) Turn the ignition switch to ON.
(5) Turn the GTS on.
(6) Enter the following menus: Chassis / EMPS / Utility / Power Steering ECU Initial Setting.
Chassis > EMPS > Utility
|
Tester Display |
|---|
|
Power Steering ECU Initial Setting |
NOTICE:
Do not turn the steering wheel sharply.
(7) Check for RoBs.
Click here
Chassis > EMPS > Utility
|
Tester Display |
|---|
|
Vehicle Control History (RoB) |
NOTICE:
When Power Steering ECU Initial Setting (assist map writing) are completed, make sure to check for vehicle control history (RoB).
END POSITION INITIAL SETTING (for Type B)
Perform end position initial setting after replacing or servicing parts related to steering operation
|
Removed or Replaced Part |
Work |
End Position Initial Setting |
|---|---|---|
|
○: Necessary
-: Unnecessary |
||
|
Power steering ECU assembly |
Removing |
- |
|
Replacing |
○ |
|
|
Electric power steering column sub-assembly |
Removing |
- |
|
Replacing |
○ |
|
|
No. 2 steering intermediate shaft assembly |
Removing |
- |
|
Replacing |
○ |
|
|
Steering gear assembly |
Removing |
- |
|
Replacing |
○ |
|
NOTICE:
If matchmarks were not placed when removing parts related to steering operation, perform end position initial setting.
HINT:
When disconnecting and reconnecting the auxiliary battery, there is an automatic learning function that completes learning when the respective system is used.
(a) Align the front wheels straight ahead and center the steering wheel.
(b) Perform end position learning value clear. (*1)
(1) When using GTS:
- Perform end position learning value clear according to the instructions on the GTS screen.
Chassis > EMPS > Utility
|
Tester Display |
|---|
|
End Position Learning Value Clear |
(2) When not using GTS:
- Turn the ignition switch off.
-
Disconnect the cable from the negative (-) auxiliary battery terminal and wait for at least 40 seconds.
Click here
-
Connect the cable to the negative (-) auxiliary battery terminal.
Click here
(c) Start the engine.
(d) Fully turn the steering wheel to the right and left on level ground.
(e) According to the display on the GTS, read the Data List.
Chassis > EMPS > Data List
|
Tester Display |
|---|
|
Status of Learned Left/Right End Position for End Torque Limit Control |
Standard:
Left Direction (Decision Position) & Right Direction (Decision Position)
(f) If the results are not as specified, perform the procedure again from step (*1).
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