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 DTC P0630 is output -
    Perform code registration Engine start See Service Bulletin for the registration method.

      If possible, read the transmission compensation code from the previous ECM

    • Transfer transmission compensation code (step 2)*1

    • Perform road test to allow ECM to learn

    • Large shift shock

    • Engine overruns

    		 -

      If impossible, the transmission compensation code cannot be read from the previous ECM

    • Set transmission compensation code (step 1)*2

    • Perform road test to allow ECM to learn

    • 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)

    • 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

    • 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

    • Reset Memory

    • Perform road test to allow ECM to learn

    • Large shift shock

    • Engine overruns

    		 -

    • 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

    • Adaptive 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

    		 -
    Engine stop and start ECU

    • Upload the number of starter operations

    • Reset air conditioning information

    • Learning air conditioning information

    • Clear the zero point calibration data

    • Deceleration sensor zero point calibration

    		 Stop and start system -
    Air conditioning amplifier assembly

    • Reset air conditioning information

    • Learning air conditioning information

    Starter assembly

    Note

    When the starter assembly is replaced, "ST NO. 1 relay" and "ST NO. 2 relay" must be also replaced.

    		 Clear number of starter operations
    Airbag ECU assembly

    • Clear the zero point calibration data

    • Deceleration sensor zero point calibration
    Battery

    • Integrated current value initialization

    • Switch battery type
    Automatic transmission assembly

    • Set transmission compensation code (step 1)*3

    • Perform road test to allow ECM to learn

    • Large shift shock

    • Engine overruns

    		 -

    • Transmission valve body assembly

    • Solenoid (SL1, SL2, SL3, SL4, SL5 and SL6) valves

    		 Perform road test to allow ECM to learn
    Automatic transmission fluid ATF thermal degradation estimate reset The value of the Data List item "ATF Thermal Degradation Estimate" is not estimated correctly. -

    • Suspension control ECU

    • Height control sensor

    		 Registration of vehicle identification information

    • Vehicle height sensor data may be affected due to installation position, or vehicle height recognition may be erroneous

    • DTCs are output

    • Air suspension control

    		 -
    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

    • Perform tire position identification

    • 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

    		 -
    Brake actuator assembly Perform acceleration sensor (yaw rate sensor) zero point calibration and store system information

    • DTCs are stored

    • ABS warning light illuminates

    • Brake system warning light (red indicator) illuminates

    • Slip indicator light illuminates

    • VSC disabled or malfunctions

    		 -
    Yaw rate sensor

    • Clear zero point calibration data and system information

    • Perform acceleration sensor (yaw rate sensor) and zero point calibration and store system information
    Electric parking brake ECU

    • Reset memory

    • Acquire tension sensor zero point

    		 Electric parking brake system -
    Parking brake actuator assembly with bracket (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
    Telematics transceiver assembly Register vehicle information Emergency call service -
    Mobile phone battery Reset mobilephone battery condition

      w/ Parking Support Brake System

    • Clearance warning ECU assembly

    • Ultrasonic sensor detection angle

    • Steering angle neutral point

    • Registration of bumper type

    • Ultrasonic sensor detection angle registration

    • Parking support brake system

    • Parking support alert system

    		 -

      w/ Parking Support Brake System

    • Ultrasonic sensor (Including removal and installation)

    • Ultrasonic sensor detection angle

    • Ultrasonic sensor detection angle registration

      w/o Parking Support Brake System

    • Clearance warning ECU assembly

    		 Registration of bumper type Parking support alert system -

      w/o Parking Support Brake System

    • Ultrasonic sensor (front left sensor, front left center sensor, front right center sensor, front right sensor)

    		 Initialization of ultrasonic sensors (front left sensor, front left center sensor, front right center sensor, front right sensor) Parking support alert system

      w/o Parking Support Brake System

    • Ultrasonic sensor (rear left sensor, rear left center sensor, rear right center sensor, rear right sensor)

    		 Initialization of ultrasonic sensors (rear left sensor, rear left center sensor, rear right center sensor, rear right sensor) Parking support alert system
    Rear bumper assembly (Including removal and installation)

    • Ultrasonic sensor detection angle

    • Ultrasonic sensor detection angle registration

    		 Parking support brake system -
    Front bumper assembly (Including removal and installation)

    • Ultrasonic sensor detection angle

    • Ultrasonic sensor detection angle registration

    		 Parking support brake system -
    Front television camera view adjustment Panoramic view monitor system -
    Suspension, tires, etc.

    • Ultrasonic sensor detection angle

    • Ultrasonic sensor detection angle registration

    		 Parking support brake system -

    • Parking assist ECU initialization

    • Adjust steering angle

    • Rear television camera view adjustment (for Rear camera detection system)

    		 Panoramic view monitor system -
    Rear television camera assembly optical axis (Back camera position setting) Parking assist monitor system -
    Steering sensor (Including removal and installation) Steering angle neutral point Parking support brake system -
    Parking assist monitor system -
    Panoramic view monitor system -
    Steering angle setting Parking assist monitor system -
    Panoramic view monitor system -
    Parking assist ECU

    • Parking assist ECU initialization

    • Adjust steering angle

    		 Panoramic view monitor system -

    • Front television camera assembly (Including removal and installation)

    • Radiator grille (Including removal and installation)

    		 Front television camera view adjustment

    • Side television camera assembly LH (Including removal and installation)

    • Side television camera assembly RH (Including removal and installation)

    • Outer rear view mirror assembly with cover LH (Including removal and installation)

    • Outer rear view mirror assembly with cover RH (Including removal and installation)

    		 Side television camera view adjustment

    • Front television camera assembly, front bumper assembly or radiator grille

    • 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

    • Rear television camera view adjustment (for Rear camera detection system)
    Rear television camera assembly (Including removal and installation)

    • Rear television camera view adjustment

    • Rear television camera view adjustment (for Rear camera detection system)

    • Parking support alert system

    • Parking support brake system

    • Panoramic view monitor system

    		 -

    • Parking assist monitor system initialization

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

    		 Parking assist monitor system -
    Blind spot monitor sensor Blind spot monitor beam axis confirmation

    • DTCs are output

    • Parking support alert system

    • Parking support brake system

    • 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

    • Engine start

    		 See Service Bulletin for the registration method.

    • Position control ECU assembly (Including removal and installation)

    • No.2 position control ECU assembly (Including removal and installation)

    • Front seat headrest assembly (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)

    • Front seat headrest insert sub-assembly LH (Including removal and installation)

    • Front seat headrest insert sub-assembly RH (Including removal and installation)

    		 Initialize position control ECU Front power seat control system -

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

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

    • Rear seat headrest assembly RH (Including removal and installation)

    • Rear seat headrest assembly LH (Including removal and installation)

    • Rear No.1 seat adjuster assembly (Including removal and installation)

    • Rear No.2 seat adjuster assembly (Including removal and installation)

    		 Initialize position control ECU Rear power seat control system -

      for LHD:

    • No.1 seat reclining adjuster assembly RH (Including removal and installation)


      for RHD:

    • No.1 seat reclining adjuster assembly LH (Including removal and installation)

    • 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

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

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

    • No.1 rear cooling Unit damper servo sub-assembly

    		 Initialization servo motor DTCs are output -

    • Rear multiplex network door ECU LH

    • Rear multiplex network door ECU RH

    • Rear multiplex network door ECU LH or rear multiplex network door ECU RH is the connectors are disconnected

    		 Initialize rear door sunshade system The rear door sunshade system does not operate -

    • Power window regulator motor assembly LH

    • Power window regulator motor assembly RH

    • Front door window regulator assembly LH

    • Front door window regulator assembly RH

    • Rear door window regulator assembly LH

    • Rear door window regulator 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

    • Front door front glass run LH

    • Front door front glass run RH

    • Front Door No. 2 glass run LH

    • Front Door No. 2 glass run RH

    • Rear door glass run LH

    • Rear door glass run RH

    • Rear door No. 3 glass run LH

    • Rear door No. 3 glass run RH

    		 Initialize power window control system

    • Auto up and down function

    • Jam protection function

    • Catch protection function

    • Remote control function

    • Key-linked function

    • Wireless transmitter-linked function

    • Key-off operation function

    • Window open warning function

    		 -

    • Roof glass (Including removal and installation)

    • Sliding roof drive gear sub-assembly

    		 Initialize sliding roof system

    • Auto function

    • Jam protection function

    • Key-off operation

    • Wireless transmitter-linked operation

    • Key-linked function

    • Open warning function may not operate

    • Sliding roof may become misaligned

    		 -
    Kick door control sensor Reset connection history There are cases where the connection history display differs from the vehicle condition -
    The luggage closer motor assembly Reset connection history There are cases where the connection history display differs from the vehicle condition -
    Initialize luggage closer motor assembly The power trunk lid does not operate -

    • The luggage closer motor assembly connector is disconnected

    • When the luggage compartment door is opened using a mechanical key

    		 Initialize luggage closer motor assembly The power trunk lid does not operate -

      w/ Air Suspension System:

    • Headlight ECU sub-assembly LH

    		 Synchronize the vehicle information Automatic headlight beam level control system -

      w/o Air Suspension System:

    • Headlight ECU sub-assembly LH

    • Synchronize the vehicle information

    • Perform headlight ECU sub-assembly LH initialization

      w/o Air Suspension System:

    • Replacement of the rear height control sensor sub-assembly LH, removal and reinstallation of the rear height control sensor sub-assembly LH, replacement of the suspension, etc. have been performed.

    		 Perform headlight ECU sub-assembly LH initialization

    *1: Read the transmission compensation code from the previous ECM, then transfer it to the new ECM.

    *2: Set the transmission compensation code of the current automatic transmission.

    *3: Set the transmission compensation code for the new automatic transmission.