Caution / Notice / Hint

WARNING: This page is about a different car, the 2025 Toyota Highlander, 2024 Toyota Highlander, and 2023 Toyota Highlander. 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 engine unit removal/installation are shown below.

*1: Not necessary when ECM replaced with new one

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	Idle the engine for approximately 5 to 60 minutes or drive the vehicle until stop and start control is permitted	Stop and Start System	Refer to PRECAUTION [10/2022 - 11/2023]
	Perform steering sensor zero point calibration	Lane Control System	Refer to INITIALIZATION [12/2019 - ]
		Parking Support Brake System*1
		Pre-collision System
		Lighting System (EXT) (w/ AFS)
	Initialize back door lock	Power Door Lock Control System	Refer to INITIALIZATION [12/2019 - 11/2023]
	Reset back door close position	Power Back Door System	Refer to INITIALIZATION [12/2019 - 11/2023]
Replacement of ECM	Perform Vehicle Identification Number (VIN) registration	DTC is output	Refer to REGISTRATION [10/2022 - ]
	Heavy knock history Save history Write history	-	Refer to REGISTRATION [10/2022 - ]
	Code registration	Engine start function	Refer to REGISTRATION [10/2022 - 11/2023]
	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	for Initialization: Refer to INITIALIZATION [10/2022 - ] for Registration: Refer to REGISTRATION [10/2022 - ]
	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
Replacement of engine assembly Gas leak from exhaust system is repaired Replacement of camshaft timing gear assembly Replacement of cylinder head sub-assembly Replacement of camshaft (for intake or exhaust camshaft) Replacement of camshaft timing exhaust gear assembly Replacement of port fuel injector assembly Replacement of direct fuel injector assembly Replacement of fuel (engine room side) pump assembly (for high pressure side) Replacement of spark plug Replacement of ignition coil assembly Replacement of knock control sensor Replacement of engine coolant temperature sensor (for Water Inlet Housing Side) Replacement of engine coolant temperature sensor (for Cylinder Block Side) Replacement of Engine coolant temperature sensor (for Outlet Side)	Inspection after repair	Poor idle, etc. Engine start function, etc.	Refer to INITIALIZATION [10/2022 - ]
Replacement of starter assembly*3	Clear the number of starter operations	Stop and Start System	Refer to REGISTRATION [10/2022 - 11/2023]
Replacement of automatic transaxle assembly	Perform reset memory Input transaxle compensation code into ECM Perform road test to allow ECM to learn	Large shift shock Deterioration of fuel efficiency	for Initialization: Refer to INITIALIZATION [10/2022 - ] for Registration: Refer to REGISTRATION [10/2022 - ]
Replacement of automatic transaxle fluid	ATF thermal degradation estimate reset	The value of the Data List item "ATF Thermal Degradation Estimate" is not estimated correctly	Refer to INITIALIZATION [10/2022 - ]
Suspension, tires, etc. (The vehicle height changes because of suspension or tire replacement)	Rear television camera assembly optical axis (Back camera position setting)	Parking Assist Monitor System	Refer to CALIBRATION [10/2022 - ]
	Parking assist ECU initialization	Panoramic View Monitor System	Refer to CALIBRATION [10/2022 - 11/2023]
	Perform headlight ECU sub-assembly LH initialization	Lighting System (EXT) (w/ AFS)	Refer to INITIALIZATION [12/2019 - 11/2023]
Front wheel alignment adjustment	Perform "Reset Memory" Perform "Calibration"	VSC is disabled or malfunctions DTCs are output Slip indicator light illuminates ABS warning light illuminates	Refer to UTILITY [12/2019 - 11/2023]
Replacement of front bumper assembly*4	Front television camera view adjustment	Panoramic View Monitor System	Refer to CALIBRATION [10/2022 - 11/2023]

*1: Learning can also be performed using the GTS.

*2: Not necessary when ECM replaced with new one.

*3: When the starter assembly is replaced, "ST relay" must be also replaced.

*4: Even when not replacing the part, it is necessary to perform the specified necessary procedures after installation.

NOTE:

This procedure includes the removal of small-head bolts. Refer to Small-Head Bolts of Basic Repair Hint to identify the small-head bolts.

Refer to PRECAUTION [12/2019 - 11/2023]