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
    ECM Vehicle Identification Number (VIN) registration MIL comes on / MIL does not come on -
    ECU communication ID registration (Immobiliser system) Engine start function See the Service Bulletin for the registration method.

    • Throttle body with motor assembly

    • Cleaning the deposits from the throttle body with motor assembly

    • Cam timing control motor with EDU assembly

    • Removal and installation of a cam timing control motor with EDU assembly

    • Camshaft timing intake gear assembly

    • Removal and installation of a camshaft timing intake 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

    • Port fuel injector assembly

    • Direct fuel injector assembly

    • Fuel pump with filter assembly (for low pressure side)

    • Fuel pump with seal sub-assembly (for high pressure side)

    • Air fuel ratio sensor

    • Heated oxygen sensor

    • Engine coolant temperature sensor

    • Spark plug

    • Ignition coil assembly

    • Adjust valve clearance

    • Air leaks from intake system

    • Gas leaks from exhaust system

    • Knock sensor

    		 Inspection after repair Poor idle, engine start, etc. -
    Millimeter wave radar sensor assembly Adjust millimeter wave radar sensor assembly

    • Dynamic radar cruise control system

    • Pre-crash safety system

    • Forward recognition camera system

    • Lane departure alert system (w/ Steering Control)

    		 -

    • Forward recognition camera

    • Windshield glass

    		 Adjust forward recognition camera

    • Dynamic radar cruise control system

    • Pre-crash safety system

    • Forward recognition camera system

    • Lane departure alert system (w/ Steering Control)

    • Road sign assist system

    • Adaptive high beam system

    • Automatic high beam system

    		 -
    Automatic transmission assembly

    1. Set transmission compensation code (step 1)*1

    2. Perform road test to allow TCM to learn

    • Large shift shock

    • Deterioration of fuel efficiency

    		 -

    • Valve body assembly

    • Shift solenoid valve SL1, 2, 3, 4 and 5

    		 Perform road test to allow TCM to learn

    TCM

    (If possible, read the transmission compensation code from the previous TCM)

    1. Transfer transmission compensation code (step 2)*2

    2. Perform road test to allow TCM to learn

    TCM

    (If impossible, read the transmission compensation code from the previous TCM)

    1. Set transmission compensation code (step 1)*3

    2. Perform road test to allow TCM to learn
    Engine assembly

    1. Reset memory

    2. Perform road test to allow TCM to learn
    ECM Reset memory
    Torque vectoring differential ECU assembly All learning Torque vectoring differential system -
    Torque transfer module motor sub-assembly Motor exchange learning
    Torque vectoring differential FDU (Final Drive Unit) ASSY exchange learning

    • 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

    		 -
    Skid control ECU (brake actuator assembly) Perform yaw rate and acceleration sensor and roll rate and vertical acceleration sensor zero point calibration and store system information

    • VSC disabled or malfunctioning

    • DTCs are output

    • Slip indicator light illuminated

    • ABS warning light illuminated

    • Theft deterrent system (Tilt sensor)

    		 -

    • Yaw rate and acceleration sensor

    • Roll rate and vertical acceleration sensor

    1. Clear zero point calibration data and system information

    2. Perform yaw rate and acceleration sensor and roll rate and vertical acceleration sensor zero point calibration and store system information
    Electric parking brake ECU

    • Reset memory

    • Acquire tension sensor zero point

    		 Electric parking brake system -

    Parking brake with bracket actuator assembly

    Tech Tips

    Replaced or removed and installed

    • Reset memory

    • Acquire tension sensor zero point

    • Parking brake bedding

    • Rear disc

    • Parking brake shoe

    Tech Tips

    Replaced or removed and installed

    		 Parking brake bedding

    • 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
    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 optical axis (Back camera position setting)
    Rear television camera assembly

    • Parking assist monitor system initialization

    • Rear television camera assembly optical axis (Back camera position setting)
    Radio receiver assembly
    Blind spot monitor sensor Blind spot monitor beam axis adjustment 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 -

    • Certification ECU (smart key ECU assembly)

    • ID code box (immobiliser code ECU)

    • Steering lock ECU (steering lock actuator assembly)

    • ECM

    • Main body ECU (multiplex network body ECU)

    • Electrical key transmitter sub-assembly

    		 Code registration (Immobiliser system)

    • Wireless door lock control system

    • Entry and start system

    • Engine start

    • Steering lock system

    		 See the Service Bulletin for the registration method.

    • Position control ECU and switch assembly (driver seat)

    • Front seatback frame sub-assembly (driver seat)

    • Front seat adjuster assembly (driver seat)

    • Position control ECU and switch assembly (front passenger seat)

    • Front seatback frame sub-assembly (front passenger seat)

    • Front seat adjuster assembly (front passenger seat)

    		 Initialize position control ECU Front Power Seat Control System -
    Air conditioning amplifier assembly Memory registration Memory call function -

    • Air conditioning amplifier 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

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

    • No. 6 air conditioning radiator damper servo sub-assembly

    • No. 7 air conditioning radiator damper servo sub-assembly

    • No. 1 blower damper servo sub-assembly

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

    • Door window regulator assembly

    • Door 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

    • Catch protection 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 control computer assembly LH

    1. Synchronize the vehicle information

    2. Perform headlight control computer assembly LH initialization

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

    • *1: New automatic transmission's compensation code.

    • *2: Read the compensation code from the previous TCM, then transfer it to the new TCM.

    • *3: Set the transmission compensation code of the current automatic transmission.