Caution / Notice / Hint
WARNING: This page is about a different car, the 2025 Toyota GR Corolla, 2024 Toyota GR Corolla, and 2023 Toyota GR Corolla. However, it is still accessible from the selected car via links, so may be relevant.
The necessary procedures (adjustment, calibration, initialization, or registration) that must be performed after parts are removed and installed, or replaced during the 4WD ECU removal/installation are shown below.
NECESSARY PROCEDURE AFTER PARTS REMOVED/INSTALLED/REPLACED
| Replacement Part or Procedure | Necessary Procedure | Effect/Inoperative Function when Necessary Procedure not Performed | Link |
|---|---|---|---|
| 4WD ECU assembly | 1. ECU Data Save (ECU being replaced) | Active Torque Split AWD System | Refer to CALIBRATION [09/2022 - ] |
| 2. ECU Configuration (New ECU) | Vehicle Control History (RoB) are stored | Refer to ECU CONFIGURATION [09/2022 - ] | |
| 3. ECU Data Write (When replacing 4WD ECU assembly) (New ECU) | Active Torque Split AWD System | Refer to CALIBRATION [09/2022 - ] |
HINT:
When the cable is disconnected / reconnected to the auxiliary battery terminal, systems temporarily stop operating. However, each system has a function that completes learning the first time the system is used.
- Learning completes when vehicle is driven
Effect/Inoperative Function When Necessary Procedures are not Performed Necessary Procedures Link Front Camera System Drive the vehicle straight ahead at 35 km/h (22 mph) or more for 5 seconds or more. Refer to INITIALIZATION [11/2022 - ] - Learning completes when vehicle is operated normally
Effect/Inoperative Function When Necessary Procedures are not Performed Necessary Procedures Link Power Door Lock Control System - Back door opener
Perform door unlock operation with door control switch or electrical key transmitter sub-assembly switch. Refer to INITIALIZATION [11/2022 - ]