WHEN REMOVING,INSTALLING,REPAIRING OR REPLACING PARTS PROCEDURES NECESSARY WHEN ECU OR OTHER PARTS ARE REPLACED

Refer to the LEXUS Repair Manual for each work procedure.


  1. PROCEDURES NECESSARY WHEN ECU OR OTHER PARTS ARE REPLACED

    Replacement Part Necessary Procedure Effect/Inoperative Function when Necessary Procedures are not Performed See Page
    ECM Vehicle Identification Number (VIN) registration DTC P063051 is output -

    • Throttle body with motor assembly

    • Cleaning the deposits from the throttle body with motor assembly

    • Cylinder head sub-assembly

    • Camshaft (for intake or exhaust camshaft)

    • Camshaft timing gear assembly

    • Camshaft timing exhaust gear assembly

    • Piston or piston ring

    • Mass air flow meter sub-assembly

    • Fuel injector assembly (for port injection)

    • Fuel injector assembly (for direct injection)

    • Fuel pump (for low pressure side)

    • Fuel pump assembly (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 leaks from intake system

    • Gas leaks from exhaust system

    • Knock control sensor

    		 Inspection after repair

    • Poor idle, etc.

    • Engine start function, etc.

    		 -
    Engine assembly Inspection after repair
    Drive learning*1

    • Large shift shock

    • Deterioration of fuel efficiency

    		 -

    • Battery ECU assembly

    • HV battery junction block assembly

    		 Perform Current sensor offset learning DTCs are stored -
    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

    • Shock, vibration during shift operations

    		 -
    Hybrid vehicle transmission assembly

    • Initialize resolver*2

    • Resolver learning

    • A/T code reset

    • A/T code registration(Register compensation code)

    • Drive learning

    • Large shift shock

    • Deterioration of fuel efficiency

    		 -
    Hybrid battery terminal block Perform high voltage fuse accumulated load history reset DTCs are stored -

    • HV battery

    • No. 1 HV supply stack sub-assembly

    • No. 2 HV supply stack sub-assembly

    • Prediagnostic battery charge

    • Battery diagnosis

    • Battery status info update

    		 Warning Light Illumination

    • Forward recognition camera

    • Windshield glass (Including removal and installation)

    		 Adjust forward recognition camera

    • Dynamic radar cruise control system

    • Forward recognition camera system

    • LKA/LDA system

    • Road sign assist system

    • Pre-collision system

    • Automatic high beam system

    		 -
    Millimeter wave radar sensor assembly Adjust millimeter wave radar sensor assembly

    • Dynamic radar cruise control system

    • Forward recognition camera system

    • LKA/LDA system

    • Pre-collision system

    		 -

    • Transmission valve body assembly

    • Solenoid valve (SL1,SL2,SL3,SL4)

    		 Drive learning

    • Large shift shock

    • Deterioration of fuel efficiency

    		 -
    Hybrid vehicle control ECU

      When vehicle ECU compensation code cannot be read

    • A/T code registration(Register compensation code)

    • Drive learning

      When vehicle ECU compensation code can be read

    • A/T code registration(Read compensation code)

    • A/T code registration(Register compensation code (automatic input))

    • Drive learning
    Perform code registration Hybrid control system cannot be started See Service Bulletin for the registration method.
    Absorber Control ECU Registration of Vehicle Identification Information

    • Interrupts damping force control

    • DTCs are stored

    		 -

    • Tire pressure warning ECU and receiver

    • Tire pressure warning valve and transmitter

    • Register transmitter ID

    • Initialize tire pressure warning system

    • When DTC detection conditions of "transmitter ID not received" DTC are met, TPWS indicator blinks for 1 minute, and then illuminates.

    • Tire pressure warning function

    		 -

    • Skid control ECU assembly

    • Brake pedal stroke sensor assembly

    • Yaw rate sensor

    • Brake pedal support assembly

    • Clear stored linear solenoid valve calibration data

    • Perform initialization and calibration of the linear solenoid valve

    • DTCs are stored

    • ABS warning light illuminates

    • Brake warning light/yellow (minor malfunction) illuminates

    • Slip indicator light illuminates

    • VSC disabled or malfunctions

    		 -
    Brake actuator assembly

    • Bleed air

    • Clear stored linear solenoid valve calibration data

    • Perform initialization and calibration of the linear solenoid valve

    		 -
    Electric parking brake ECU

    • Reset memory

    • Acquire tension sensor zero point

    		 Electric parking brake system -
    Parking brake with bracket actuator assembly (Including removal and installation)

    • Reset memory

    • Acquire tension sensor zero point

    • Parking brake bedding

    • Rear disc (Including removal and installation)

    • Parking brake shoe (Including removal and installation)

    		 Parking brake bedding
    Rack and pinion power steering gear assembly

    • Torque sensor zero point calibration

    • Assist map writing

    • DTCs are output

    • EPS warning light illuminated

    		 -

    • VGRS ECU (front steering control ECU)

    • Steering actuator assembly

    • Parts between the steering wheel and tires have been removed/installed, replaced or adjusted

    		 Perform Actuator Angle Neutral Point Calibration and Initialization

    • Variable gear ratio steering system

    • Steering wheel off-center

    • DTCs are output

    		 -
    DRS ECU (rear steering control ECU) Perform Neutral Position Memorization and Motor Rotation Angle Sensor Calibration

    • Dynamic rear steering system

    • Steering wheel off-center

    • DTCs are output

    		 -
    Rear steering link assembly or rear suspension have been removed/installed, replaced, or adjusted

    • Perform Actuator Calibration Value Initialization

    • Perform Neutral Position Memorization and Motor Rotation Angle Sensor Calibration

    		 Steering wheel off-center
    Steering sensor (Including removal and installation)

    • Steering angle neutral point (Initialize parking assist monitor system)

    • Steering angle setting

    		 Parking assist monitor system -

    • Suspension, tires, etc*3

    • Television camera assembly (Only for removal and installation)

    		 Television camera assembly optical axis (Back camera position setting) -
    Television camera assembly Parking assist monitor system initialization
    Blind spot monitor sensor Blind spot monitor beam axis adjustment

    • DTCs are output

    • Blind spot monitor system

    		 -

    • Certification ECU (smart key ECU assembly)

    • Steering lock ECU (steering lock actuator or upper bracket assembly)

    • Electrical key transmitter sub-assembly

    • ID code box (immobiliser code ECU)

    • Main body ECU (multiplex network body ECU)

    		 Perform code registration

    • Wireless door lock control system

    • Entry and start system

    • Hybrid control system cannot be started

    		 See Service Bulletin for the registration method.

    • Position control ECU assembly LH (Including removal and installation)

    • Position control ECU assembly RH (Including removal and installation)

    • Power seat switch LH (Including removal and installation)

    • Power seat switch RH (Including removal and installation)

    • Front seatback frame sub-assembly LH (Including removal and installation)

    • Front seatback frame sub-assembly RH (Including removal and installation)

    • Front seat adjuster assembly LH (Including removal and installation)

    • Front seat adjuster assembly RH (Including removal and installation)

    • Power seat tilt motor assembly LH (Including removal and installation)

    • Power seat tilt motor assembly RH (Including removal and installation)

    • Power seat lifter motor assembly LH (Including removal and installation)

    • Power seat lifter motor assembly RH (Including removal and installation)

    		 Initialize position control ECU Front Power Seat Control System -

    • No. 1 blower damper servo sub-assembly

    • No. 1 air conditioning radiator damper servo sub-assembly

    • No. 2 air conditioning radiator damper servo sub-assembly

    • No. 3 air conditioning radiator damper servo sub-assembly

    • No. 4 air conditioning radiator damper servo sub-assembly

    		 Initialization servo motor DTCs are output -

    • Power window regulator motor assembly

    • Front door window regulator sub-assembly

    • Door glass

    • Door glass run

    		 Initialize power window control system

    • Auto up and down function

    • Jam protection function

    • Catch protection function

    • Remote control function

    • Key-linked function

    • Key-off operation function

    • Window open warning function

    		 -
    No. 1 headlight ECU sub-assembly LH Synchronize the vehicle information Automatic headlight beam level control system -

    • Active rear wing assembly (Including removal and installation)

    • Spoiler control ECU assembly

    		 Initialization Active rear wing system -

    *1: After performing the confirmation driving pattern, if the shock during acceleration is large after calibrating the "A/T Code Reset", perform driving learning.

    *2: If it is necessary to replace the hybrid vehicle transmission assembly, make sure to perform resolver initialization before starting work.

    *3: The vehicle height changes due to suspension or tire replacement.