Caution / Notice / Hint

WARNING: This page is about a different car, the 2021 Toyota Avalon. 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 ECM removal/installation are shown below.

NECESSARY PROCEDURES AFTER PARTS REMOVED/INSTALLED/REPLACED

Replaced Part or Performed Procedure	Necessary Procedure	Effect/Inoperative Function when Necessary Procedure not Performed	Link
Battery terminal is disconnected/reconnected	Perform steering sensor zero point calibration	Lane Departure Alert System (w/ Steering Control)	Refer to INITIALIZATION [04/2018 - 08/2021] , or refer to INITIALIZATION [08/2021 - ]
		Pre-collision System
		Intelligent Clearance Sonar System*1
		Lighting System (for Gasoline Model with Cornering Light)
	Memorize steering angle neutral point	Parking Assist Monitor System	Refer to INITIALIZATION [04/2018 - ]
	Memorize steering angle neutral point	Panoramic View Monitor System	Refer to INITIALIZATION [04/2018 - ]
Replacement of ECM	Vehicle Identification Number (VIN) registration	MIL comes on	Refer to REGISTRATION [08/2020 - ]
	ECU communication ID registration (Immobilizer system)	Engine start function	Refer to REGISTRATION [08/2020 - ]
	Code registration (Smart Key System (for Start Function, Gasoline Model))	Wireless Door Lock Control System Smart Key System (for Entry Function, Gasoline Model) Smart Key System (for Start Function, Gasoline Model) Steering lock function	Refer to REGISTRATION [08/2020 - ]
Replacement of ECM (If transaxle compensation code read from ECM)	Perform reset memory*2 Transfer transaxle compensation code Perform road test to allow ECM to learn	Large shift shock Deterioration of fuel efficiency	Refer to INITIALIZATION [08/2020 - ] for UB80F Initialization Refer to REGISTRATION [08/2020 - ] for UB80F Registration
Replacement of ECM (If transaxle compensation code not read from ECM)	Perform reset memory*2 Reset transaxle compensation code Perform road test to allow ECM to learn	Large shift shock Deterioration of fuel efficiency

*1: When performing learning using the Techstream.*2: Not necessary when ECM replaced with new one.

NOTE:

After turning the engine switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.
Refer to PRECAUTION [04/2018 - ]
If the ECM has been struck or dropped, replace it.
Perform Vehicle Identification Number (VIN) registration when replacing the ECM.
Refer to INITIALIZATION [08/2020 - ]