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 Note

    • Throttle body with motor assembly

    • Cleaning the deposits from the 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 or piston ring

    • Mass air flow meter sub-assembly

    • Fuel injector assembly (for direct injection)

    • Fuel injector assembly (for port injection)

    • Fuel pump (for high pressure)

    • Fuel pump (for low pressure)

    • Air fuel ratio sensor

    • Engine coolant temperature sensor

    • Spark plug

    • Ignition coil assembly

    • EGR valve assembly*1

    • Air leaks from intake system

    • Gas leaks from exhaust system

    • Knock control sensor

    		 Inspection after repair Poor idle, engine start, etc.

    *1

    *2
    Millimeter wave radar sensor assembly Adjust millimeter wave radar sensor assembly

    • Dynamic radar cruise control system

    • Pre-crash safety system

    		 -
    Lane departure warning camera Adjust lane departure warning camera Lane departure alert system -
    Absorber control ECU Perform registration of vehicle identification information

    • Interrupts damping force control after moving to the 9th step.

    • DTCs are output

    		 -

    • Tire pressure warning ECU and receiver

    • Tire pressure warning valve and transmitter

    • Transmitter ID registration

    • Initialization

    • 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

    for Initialization

    for Registration
    Skid control ECU assembly

    • Clear stored linear solenoid valve calibration data

    • Perform initialization and calibration of the linear solenoid valve

    • Perform yaw rate and acceleration sensor zero point calibration

    • DTCs are output

    • ABS warning light illumination

    • Brake warning light/yellow (minor malfunction) illumination

    • Slip indicator light illumination

    • VSC disable or malfunctioning

    for Initialization

    for calibration

    • Brake pedal stroke sensor assembly

    • Brake pedal

    • Clear stored linear solenoid valve calibration data

    • Perform initialization and calibration of the linear solenoid valve
    Brake actuator assembly

    • Bleed air.

    • Clear stored linear solenoid valve calibration data

    • Perform initialization and calibration of the linear solenoid valve
    Yaw rate and acceleration sensor

    • Clear stored linear solenoid valve calibration data or clear

    • Perform initialization and calibration of the linear solenoid valve

    • Perform yaw rate and acceleration sensor zero point calibration

    • Power steering ECU assembly

    • Power steering link assembly

    		 Perform rotation angle sensor initialization and torque sensor zero point calibration

    • DTCs are output

    • Steering effort different between turning steering wheel left and right

    		 -
    Power steering ECU assembly Assist map writing

    • DTCs are output

    • EPS warning light illuminated
    Radio receiver assembly Parking assist monitor system initialization Parking assist monitor system -
    Spiral cable with sensor sub-assembly

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

    • Steering angle setting

    		 Parking assist monitor system

    • Suspension, tires, etc.

    • Rear television camera assembly

    		 Rear television camera assembly optical axis (Back camera position setting) Parking assist monitor system
    Blind spot monitor sensor Blind spot monitor beam axis inspection DTCs are output -

    • Inner rear view mirror assembly

    • Garage door opener transmitter

    Re-registration of codes in the garage door opener system


    • Register transmitter code

    • Rolling code systems

    		 Garage door opener system -
    Power management control ECU ECU communication ID registration (Immobiliser system)

    • Entry and start system

    • Immobiliser system

    		 See the Service Bulletin for the registration method.

    • Certification ECU (smart key ECU assembly)

    • ID code box (immobiliser code ECU)

    • Electrical key transmitter sub-assembly

    • Steering lock ECU (steering lock actuator assembly)

    		 Code registration (Immobiliser system)

    • Wireless door lock control system

    • Entry and start system

    • Push-button start

    • Immobiliser system

    • Steering lock system

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

    • No. 2 air conditioning radiator damper servo sub-assembly (driver side)

    • No. 2 air conditioning radiator damper servo sub-assembly (front passenger side)

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

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

    • No. 5 air conditioning radiator damper servo sub-assembly

    • No. 6 air conditioning radiator damper servo sub-assembly (for dual type)

    • No. 1 blower damper servo sub-assembly

    		 Initialization servo motor (Air conditioning system) DTCs are output -

    • Door window regulator assembly

    • Power window regulator motor assembly

    • Door glass

    • Door glass run

    		 Initialize power window control system

    • Auto up and down function

    • Jam protection function

    • Remote control function

    • Key-linked function

    • Wireless transmitter-linked function

    • Key-off operation function

    • Window open warning function

    		 -

    • Sliding roof ECU (sliding roof drive gear sub-assembly)

    • Sliding roof glass sub-assembly

    • Sliding roof drive cable sub-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

    		 -
    Headlight leveling ECU assembly

    • Synchronize the vehicle information

    • Perform headlight leveling ECU assembly initialization

    		 Headlight leveling function -
    Rear height control sensor sub-assembly Perform headlight leveling ECU assembly initialization Headlight leveling function

    • *1: w/ EGR System

    • *2: w/o EGR System