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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 23 (Engine Mechanical System (A25A-FXS) - Service Information (2 Of 3)) >> Engine Assembly >> Removal [11/2023 - ] >> Caution / Notice / Hint

Caution / Notice / Hint

WARNING: This page is about a different variant/trim than selected.

The necessary procedures (adjustment, calibration, initialization or registration) that must be performed after parts are removed and installed, or replaced during engine assembly 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
Replacement of ECM Perform Vehicle Identification Number (VIN) registration DTC is output Refer to REGISTRATION [12/2019 - ]
Update ECU security key Vehicle Control History (RoB) are stored Refer to UPDATE ECU SECURITY KEY [11/2023 - ]
  • Replacement of engine assembly
  • Gas leak from exhaust system is repaired
 Perform Inspection After Repair
  • Poor idle, etc.
  • Engine start function, etc.
 Refer to INITIALIZATION [10/2021 - ]
Replacement of inverter with converter assembly Resolver learning
  • DTCs are stored
  • Slight vibration at a vehicle speed of 5 km/h (3 mph) or less
  • Shock or vibration during acceleration
 Refer to UTILITY [11/2023 - ]
Replacement of hybrid vehicle transaxle assembly
  • Resolver learning
  • Initialize resolver
Replacement of front bumper assembly*1 Front television camera view adjustment Panoramic View Monitor System Refer to CALIBRATION [11/2023 - ]
Replacement or removal and installation of 2 or more parts: 
  • Front television camera assembly, radiator grille sub-assembly or front bumper assembly
  • Rear television camera assembly
  • Side television camera assembly LH or outer rear view mirror assembly LH
  • Side television camera assembly RH or outer rear view mirror assembly RH
 Television camera view adjustment Panoramic View Monitor System Refer to CALIBRATION [11/2023 - ]
Suspension, tires, etc.*2 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 [11/2023 - ]
w/ AFS: 
  1. Perform headlight ECU sub-assembly LH initialization
 Lighting System (EXT) (w/ AFS) Refer to INITIALIZATION [11/2023 - ]
  • Replacement of headlight ECU sub-assembly LH
  • Replacement of headlight assembly LH*3
  • Synchronize the vehicle information
  • Perform headlight ECU sub-assembly LH initialization
 Lighting System (EXT) (w/ AFS) Refer to INITIALIZATION [11/2023 - ]
Front wheel alignment adjustment Perform "Calibration".
  • DTCs are stored
  • ABS warning light illuminates
  • Brake system warning light (yellow indicator) illuminates
  • Slip indicator light illuminates
  • Electronically controlled brake system disabled or malfunctions
 Refer to UTILITY [11/2023 - ]

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

*2: If the vehicle height has changed due to suspension or tire replacement

*3: w/ AFS

WARNING:
  • The engine assembly with transaxle is very heavy. Be sure to follow the procedure described in the repair information, or the engine lifter may suddenly drop or the engine assembly with transaxle may fall off the engine lifter.
    GTY566510Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a An Object Exceeding Weight Limit of Engine Lifter
  • To prevent burns, do not touch the engine, exhaust manifold or other high temperature components while the engine is hot.
    GTY563663Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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 Procedure not Performed Necessary Procedure Link
Lane Control System Perform steering sensor zero point calibration Refer to INITIALIZATION [12/2019 - ]
Pre-collision System
Lighting System (EXT) (w/ AFS)
LEARNING COMPLETES WHEN VEHICLE IS OPERATED NORMALLY

Effect/Inoperative Function when Necessary Procedure not Performed Necessary Procedure Link
Power Door Lock Control System Initialize back door lock Refer to INITIALIZATION [11/2023 - ]
Power Back Door System Reset back door close position Refer to INITIALIZATION [11/2023 - ]
Air Conditioning System After the ignition switch is turned to ON, the servo motor standard position is recognized. -
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