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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> General Information >> OEM General Information >> Setup >> When Replacing Or Removing/Installing Parts >> Work Procedure [11/2023 - ] >> Work Procedure [11/2023 - ]

Work Procedure [11/2023 - ]

  1. PROCEDURES NECESSARY WHEN ECU OR OTHER PARTS ARE REPLACED 
    Replacement Part Necessary Procedure Effect/Inoperative Function when Necessary Procedure not Performed Link
    For T24A-FTS: 
    1. ECM
    		 Perform Vehicle Identification Number (VIN) registration DTC is output Refer to REGISTRATION [10/2022 - ]
    Update ECU security key Vehicle Control History (RoB) are stored Refer to UPDATE ECU SECURITY KEY [11/2023 - ] 
    Heavy knock history
    • Save history
    • Write history
    		 - Refer to REGISTRATION [10/2022 - ]
    Code registration Engine start function Refer to REGISTRATION [11/2023 - ]
    If transaxle compensation code read from ECM 
    • Perform reset memory*1
    • 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*1
    • Reset transaxle compensation code
    • Perform road test to allow ECM to learn
    For T24A-FTS: 
    • Throttle body with motor assembly
    • Engine assembly
    • Cylinder head sub-assembly
    • Camshaft (for intake or exhaust camshaft)
    • Camshaft timing gear assembly
    • Camshaft timing exhaust gear assembly
    • Piston
    • Mass air flow meter sub-assembly
    • Port fuel injector assembly
    • Direct fuel injector assembly
    • Fuel pump (for low pressure side)
    • Fuel (engine room side) pump assembly (for high pressure side)
    • No. 2 fuel pressure sensor (for low pressure side)
    • Fuel pressure sensor (for high pressure side)
    • Air fuel ratio sensor (sensor 1)
    • Air fuel ratio sensor (sensor 2)
    • Engine coolant temperature sensor (for Water Inlet Housing Side)
    • Engine coolant temperature sensor (for Cylinder Head Side)
    • Engine coolant temperature sensor (for Outlet Side)
    • Spark plug
    • Ignition coil assembly
    • Air intake system parts
    • Exhaust system parts
    • Knock control sensor
    		 Inspection after repair
    • Poor idle, etc.
    • Engine start function, etc.
    		 Refer to INITIALIZATION [10/2022 - ]
    For T24A-FTS: 
    1. Piston ring
    		 Inspection after repair
    • Poor idle, etc.
    • Engine start function, etc.
    Heavy knock history
    1. Initializes the stored history data
    		 -
    For A25A-FXS: 
    1. 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 - ] 
    For A25A-FXS: 
    • Throttle body with motor assembly
    • Cam timing control motor with EDU assembly
    • Camshaft timing gear assembly
    • Engine assembly
    • Cylinder head sub-assembly
    • Camshaft (for intake or exhaust camshaft)
    • Camshaft timing exhaust gear assembly
    • Piston or piston ring
    • Mass air flow meter sub-assembly
    • Port fuel injector assembly
    • Direct fuel injector assembly
    • Fuel pump (for low pressure side)
    • Fuel pump assembly (for high pressure side)
    • No. 2 fuel pressure sensor (for low pressure side)
    • Fuel pressure sensor (for high pressure side)
    • Air fuel ratio sensor (sensor 1)
    • Air fuel ratio sensor (sensor 2)
    • Engine coolant temperature sensor
    • Spark plug
    • Ignition coil assembly
    • EGR valve assembly
    • Air intake system parts
    • Exhaust system parts
    • Knock control sensor
    		 Perform Inspection After Repair
    • Poor idle, etc.
    • Engine start function, etc.
    		 Refer to INITIALIZATION [10/2021 - ]
    Radiator shutter assembly Change grille shutter control mode and/or perform initialization Grille Shutter System Refer to INITIALIZATION [10/2021 - ]
    Hybrid vehicle control ECU Update ECU security key Vehicle Control History (RoB) are stored Refer to UPDATE ECU SECURITY KEY [11/2023 - ] 
    Code registration Hybrid control system cannot be started Refer to REGISTRATION [11/2023 - ]
    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 - ]
    Hybrid vehicle transaxle assembly
    • Resolver learning
    • Initialize resolver
    HV battery Battery status info update HV battery status information cannot be updated Refer to UTILITY [11/2023 - ]
    Hybrid battery terminal block High voltage fuse accumulated load history reset DTCs are stored
    Rear traction motor with transaxle assembly
    • Resolver learning
    • Initialize resolver
    • 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 - ]
    Forward recognition camera Update ECU security key Vehicle Control History (RoB) are stored Refer to UPDATE ECU SECURITY KEY [11/2023 - ] 
    Adjust forward recognition camera
    • Dynamic Radar Cruise Control System
    • Front Camera System
    • Lane Control System
    • Road Sign Assist System
    • Pre-collision System
    • Lighting System (EXT)
    		 One Time Recognition: Refer to TARGET ADJUSTMENT (ONE TIME RECOGNITION) [09/2020 - ]
    Sequential Recognition: Refer to TARGET ADJUSTMENT (SEQUENTIAL RECOGNITION) [09/2020 - ]
    Driving Adjustment: Refer to DRIVING ADJUSTMENT [09/2020 - ]
    Windshield glass* Adjust forward recognition camera
    • Dynamic Radar Cruise Control System
    • Front Camera System
    • Lane Control System
    • Road Sign Assist System
    • Pre-collision System
    • Lighting System (EXT)
    		 One Time Recognition: Refer to TARGET ADJUSTMENT (ONE TIME RECOGNITION) [09/2020 - ]
    Sequential Recognition: Refer to TARGET ADJUSTMENT (SEQUENTIAL RECOGNITION) [09/2020 - ]
    Driving Adjustment: Refer to DRIVING ADJUSTMENT [09/2020 - ]
    Millimeter wave radar sensor assembly Adjust millimeter wave radar sensor assembly
    • Dynamic Radar Cruise Control System
    • Lane Control System
    • Road Sign Assist System
    • Front Radar Sensor System
    • Pre-collision System
    • Lighting System (EXT)
    		 Triangle Target: Refer to TARGET ADJUSTMENT (TRIANGLE TARGET) [10/2022 - ]
    Flat Surface Target: Refer to TARGET ADJUSTMENT (FLAT SURFACE TARGET) [10/2022 - ]
    Driving Adjustment: Refer to DRIVING ADJUSTMENT [10/2022 - ]
    Engine stop and start ECU assembly
    • Upload the number of starter operations
    • Perform external backup boost converter (eco run vehicle converter assembly) existence learning
    • Clear the zero point calibration data
    • Perform zero point calibration of the deceleration sensor
    		 Stop and Start System Refer to REGISTRATION [11/2023 - ]
    Air conditioning amplifier assembly
    • Reset air conditioning information
    • Learning air conditioning information
    Starter assembly*2 Clear the number of starter operations
    Oil pump with solenoid assembly Check the oil pump with solenoid assembly
    Battery
    • Integrated Current Value Initialization
    • Switch Battery Type
    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 - ]
    • Transmission valve body assembly
    • Solenoid (SL1, SL2, SL3, SL4, SL5 and/or SL6) valve
    • Perform reset memory
    • Reset transaxle compensation code
    • Perform road test to allow ECM to learn
    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 - ]
    4WD ECU assembly For Dynamic Torque Control AWD System: 
    • ECU data save
    • ECU data initialization
    • ECU data write
    		 Dynamic Torque Control AWD System Refer to CALIBRATION [12/2019 - ]
    For Dynamic Torque Vectoring AWD System: 
    • ECU data save
    • ECU data initialization
    • ECU data write
    		 Dynamic Torque Vectoring AWD System Refer to CALIBRATION [12/2019 - ]
    • Front 4WD linear solenoid (Transfer assembly)
    • Rear 4WD linear solenoid (Rear differential carrier assembly)
    • ECU data initialization
    • Disconnect system function check
    		 Dynamic Torque Control AWD System Refer to CALIBRATION [12/2019 - ]
    Dynamic Torque Vectoring AWD System Refer to CALIBRATION [12/2019 - ]
    For Dynamic Torque Vectoring AWD system: 
    1. Electro magnetic control coupling sub-assembly (Electro magnetic control coupling sub-assembly LH, Electro magnetic control coupling sub-assembly RH)
    • ECU data initialization
    • ECU data write
    		 Dynamic Torque Vectoring AWD System Refer to CALIBRATION [12/2019 - ]
    Temperature sensor ECU data initialization Dynamic Torque Control AWD System Refer to CALIBRATION [12/2019 - ]
    Dynamic Torque Vectoring AWD System Refer to CALIBRATION [12/2019 - ]
    • Tire pressure warning valve and transmitter
    • Tire pressure warning ECU and receiver
    • ID registration
    • Initialization
    • Tire position identification
    		 Tire Pressure Warning System Refer to PRECAUTION [11/2023 - ]
    Suspension, tires, etc.*3 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 - ]
    For Gasoline Model: 
    1. Skid control ECU (Brake actuator assembly)
    		 Update ECU security key Vehicle Control History (RoB) are stored Refer to UPDATE ECU SECURITY KEY [11/2023 - ] 
    Operate the electric parking brake switch (electric parking brake switch assembly) Electric Parking Brake System Refer to PRECAUTION [11/2023 - ]
    Perform "Calibration"
    • VSC is disabled or malfunctions
    • DTCs are output
    • Slip indicator light illuminates
    • ABS warning light illuminates
    		 Refer to UTILITY [11/2023 - ]
    For HEV Model: 
    1. No. 1 skid control ECU (brake booster with master cylinder assembly)
    		 Update ECU security key Vehicle Control History (RoB) are stored Refer to UPDATE ECU SECURITY KEY [11/2023 - ] 
    1. Bleed air*
    2. 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
    		 For Bleeding: Refer to BLEEDING [12/2019 - ]
    For Calibration: Refer to UTILITY [11/2023 - ]
    For HEV Model: 
    1. No. 2 skid control ECU (brake actuator assembly)
    		 Update ECU security key Vehicle Control History (RoB) are stored Refer to UPDATE ECU SECURITY KEY [11/2023 - ] 
    1. Bleed air*
    2. 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
    		 For Bleeding: Refer to BLEEDING [12/2019 - ]
    For Calibration: Refer to UTILITY [11/2023 - ]
    Operate the electric parking brake switch (electric parking brake switch assembly) Electric Parking Brake System Refer to PRECAUTION [11/2023 - ]
    For HEV Model: 
    • Brake pedal stroke sensor assembly*
    • Brake pedal*
    		 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 - ]
    Rack and pinion power steering gear assembly Update ECU security key Vehicle Control History (RoB) are stored Refer to UPDATE ECU SECURITY KEY [11/2023 - ] 
    ECU configuration
    • Vehicle Control History (RoB) are stored
    • EPS warning light illuminates
    		 Refer to ECU CONFIGURATION [11/2023 - ] 
    Power steering ECU initial setting
    • Vehicle Control History (RoB) are stored
    • EPS warning light illuminates
    		 Refer to CALIBRATION [11/2023 - ]
    Steering sensor Update ECU security key Vehicle Control History (RoB) are stored Refer to UPDATE ECU SECURITY KEY [11/2023 - ] 
    Radio and display receiver assembly Register Vehicle Information*4 - Refer to REGISTRATION [10/2022 - ]
    Software update - Refer to REGISTRATION [10/2022 - ]
    DCM (Telematics transceiver) DCM activation Safety Connect System Refer to DCM ACTIVATION [12/2019 - ]
    Code registration Telematics System For HV Model: Refer to REGISTRATION [11/2023 - ]
    For Gasoline Model: Refer to REGISTRATION [11/2023 - ]
    Back-up battery Perform the reset back-up battery condition Safety Connect System Refer to INITIALIZATION [12/2019 - ]
    Clearance warning ECU assembly Update ECU security key Vehicle Control History (RoB) are stored Refer to UPDATE ECU SECURITY KEY [11/2023 - ] 
    w/o Parking Support Brake System: 
    1. Registration of bumper type
    		 Intuitive Parking Assist System Refer to CALIBRATION [11/2023 - ]
    w/ Parking Support Brake System: 
    • Measurement of ultrasonic sensor height and angle
    • Bumper type registration
    • Ultrasonic sensor detection angle registration
    • Intuitive Parking Assist System
    • Parking Support Brake System
    		 Refer to CALIBRATION [11/2023 - ]
    Ultrasonic sensor w/o Parking Support Brake System: 
    1. Initialization of ultrasonic sensor
    		 Intuitive Parking Assist System Refer to CALIBRATION [11/2023 - ]
    w/ Parking Support Brake System: 
    • Measurement of ultrasonic sensor height and angle
    • Ultrasonic sensor detection angle registration
    • Intuitive Parking Assist System
    • Parking Support Brake System
    		 Refer to CALIBRATION [11/2023 - ]
    • Front television camera assembly*
    • Radiator grille sub-assembly*
    		 Front television camera view adjustment Panoramic View Monitor System Refer to CALIBRATION [11/2023 - ]
    • Side television camera assembly LH*
    • Side television camera assembly RH*
    • Outer rear view mirror assembly LH*
    • Outer rear view mirror assembly RH*
    		 Side television camera view adjustment Panoramic View Monitor System Refer to CALIBRATION [11/2023 - ]
    Rear television camera assembly*
    • Parking assist monitor system initialization
    • Television camera assembly optical axis (Back camera position setting)
    		 Parking Assist Monitor System Refer to CALIBRATION [10/2022 - ]
    Rear 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 - ]
    Blind spot monitor sensor Blind spot monitor beam axis adjustment
    • Parking Support Brake System
    • Blind Spot Monitor System
    		 Refer to ADJUSTMENT [11/2023 - ]
    Parking assist ECU Parking assist ECU initialization Panoramic View Monitor System Refer to CALIBRATION [11/2023 - ]
    Central gateway ECU (network gateway ECU) Update ECU security key Vehicle Control History (RoB) are stored Refer to UPDATE ECU SECURITY KEY [11/2023 - ] 
    • Certification ECU (smart key ECU assembly)
    • Electrical key transmitter sub-assembly
    • ID code box (immobiliser code ECU)
    		 Code registration
    • Wireless Door Lock Control System
    • Smart Key System (for Entry function)
    • Smart Key System (for Start function)
    • Engine start function
    • Hybrid control system cannot be started
    		 For HV Model: Refer to REGISTRATION [11/2023 - ]
    For Gasoline Model: Refer to REGISTRATION [11/2023 - ]
    Main body ECU (multiplex network body ECU) ECU configuration - Refer to ECU CONFIGURATION [11/2023 - ] 
    Code registration
    • Wireless Door Lock Control System
    • Smart Key System (for Entry function)
    • Smart Key System (for Start function)
    • Engine start function
    • Hybrid control system cannot be started
    		 For HV Model: Refer to REGISTRATION [11/2023 - ]
    For Gasoline Model: Refer to REGISTRATION [11/2023 - ]
    Inner rear view mirror assembly Register codes in the garage door opener system Garage door opener system For EC Inner Mirror: Refer to REGISTRATION [11/2023 - ]
    For Digital Inner Mirror: Refer to REGISTRATION [11/2023 - ]
    Airbag sensor assembly Update ECU security key Vehicle Control History (RoB) are stored Refer to UPDATE ECU SECURITY KEY [11/2023 - ] 
    For Gasoline Model: 
    • Clear the zero point calibration data*
    • Perform zero point calibration of the deceleration sensor*
    		 Stop and Start System Refer to REGISTRATION [11/2023 - ]
    For HEV Model: 
    1. 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 - ]
    For Gasoline Model: 
    • Perform reset memory*
    • Perform "Calibration"*
    • DTCs are stored
    • ABS warning light illuminates
    • Slip indicator light illuminates
    • Electronically controlled brake system does not operate correctly
    		 Refer to UTILITY [11/2023 - ]
    Zero point calibration (Occupant classification system)
    • Occupant Classification System
    • Passenger airbag ON/OFF indicator
    • Airbag System (Front passenger side)
    • Seat Belt Warning System (Front passenger)
    		 Refer to INITIALIZATION [11/2023 - ]
    Front passenger seat* Zero point calibration (Occupant Classification System)
    • Occupant Classification System
    • Passenger airbag ON/OFF indicator
    • Airbag System (Front passenger side)
    • Seat Belt Warning System (Front passenger)
    		 Refer to INITIALIZATION [11/2023 - ]
    • Position control ECU assembly*
    • Reclining motor (separate type front seatback spring assembly)*
    • Slide motor (separate type front seat cushion spring assembly)*
    • Front vertical motor (power seat tilt motor assembly LH)*
    • Lifter motor (power seat lifter motor assembly LH)*
    		 Initialize position control ECU Front Power Seat Control System (w/ Memory) Refer to REGISTRATION [11/2023 - ]
    • No. 1 air conditioning radiator damper servo sub-assembly
    • No. 1 blower damper servo sub-assembly
    • Rear mode damper servo sub-assembly
    • Rear air mix damper servo sub-assembly
    		 Servo motor initialization (Air conditioning system) DTCs are output For HV Model: Refer to INITIALIZATION [11/2023 - ]
    For Gasoline Model with Automatic Air Conditioning System: Refer to INITIALIZATION [11/2023 - ]
    • Power window regulator motor assembly LH*
    • Power window regulator motor assembly RH*
    • Front door window regulator sub-assembly LH*
    • Front door window regulator sub-assembly RH*
    • Rear door window regulator sub-assembly LH*
    • Rear door window regulator sub-assembly RH*
    • Front door glass sub-assembly LH*
    • Front door glass sub-assembly RH*
    • Rear door glass sub-assembly LH*
    • Rear door glass sub-assembly RH*
    • Front door glass run LH*
    • Front door glass run RH*
    • Rear door glass run LH*
    • Rear door glass run RH*
    		 Initialize power window control system
    • Auto up and down function
    • Jam protection function
    • Catch protection function
    • Remote control function
    • Wireless transmitter-linked function
    • Key-linked function
    • Key-off operation function
    • Window open warning function
    		 Refer to INITIALIZATION [12/2019 - ]
    Sliding roof ECU (Sliding roof drive gear assembly)* Initialize sliding roof system
    • Auto operation function
    • Jam protection function
    • Key-off operation function
    • Key-linked function
    • Wireless transmitter-linked function
    • Sliding roof open warning function
    		 Refer to INITIALIZATION [12/2019 - ]
    Initialize panoramic moon roof system (Sliding roof)
    • Auto operation function
    • Jam protection function
    • Key-off operation function
    • Sliding roof open warning function
    		 Refer to INITIALIZATION [12/2019 - ]
    • Sliding roof glass sub-assembly (for Moon Roof)*
    • No. 1 Sliding roof glass sub-assembly (for Panoramic Moon Roof)*
    • No. 2 Sliding roof glass sub-assembly (for Panoramic Moon Roof)*
    		 Initialize sliding roof system
    • Auto operation function
    • Jam protection function
    • Key-off operation function
    • Key-linked function
    • Wireless transmitter-linked function
    • Sliding roof open warning function
    		 Refer to INITIALIZATION [12/2019 - ]
    Initialize panoramic moon roof system (Sliding roof)
    • Auto operation function
    • Jam protection function
    • Key-off operation function
    • Sliding roof open warning function
    		 Refer to INITIALIZATION [12/2019 - ]
    • Sliding roof housing sub-assembly (for Panoramic Moon Roof)*
    • Sliding roof housing assembly (for Moon Roof)*
    		 Initialize panoramic moon roof system (Sliding roof)
    • Auto operation function
    • Jam protection function
    • Key-off operation function
    • Sliding roof open warning function
    		 Refer to INITIALIZATION [12/2019 - ]
    • Roof sunshade ECU (sliding roof drive gear assembly)*
    • Sunshade trim sub-assembly*
    		 Initialize panoramic moon roof system (Roof sunshade)
    • Auto operation function
    • Jam protection function
    • Key-off operation function
    		 Refer to INITIALIZATION [12/2019 - ]
    • Multiplex network door ECU
    • Power back door unit assembly set LH*
    • Power back door unit assembly set RH*
    		 Reset back door close position Power Back Door System Refer to INITIALIZATION [11/2023 - ]
    • Headlight ECU sub-assembly LH
    • Headlight assembly LH *5
    • Synchronize the vehicle information
    • Perform headlight ECU sub-assembly LH initialization
    		 Lighting System (EXT) (w/ AFS) Refer to INITIALIZATION [11/2023 - ]
    Rear height control sensor sub-assembly LH* Perform headlight ECU sub-assembly LH initialization
    Front bumper assembly* Front television camera view adjustment Panoramic View Monitor System Refer to CALIBRATION [11/2023 - ]

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

    *1: Not necessary when ECM replaced with new one

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

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

    *4: w/ Telematics Transceiver

    *5: w/ AFS

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