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 Perform Vehicle Identification Number (VIN) or frame number registration

    • MIL illuminates / -

    • DTC P063051 is stored

    		 -
    ECU communication ID registration (Immobiliser System) Engine start function See Service Bulletin for the registration method.

      for 8AR-FTS

    • Piston ring

    		 Clear heavy knock history - -

      for 8AR-FTS

    • 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

    • Port fuel injector assembly

    • Direct fuel injector assembly

    • Fuel pump assembly (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

    • 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.

      for 2GR-FKS (w/ Canister Pump Module)

    • 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 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

    • Heated oxygen sensor

    • 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.

    		 -

      for 2GR-FKS (w/o Canister Pump Module)

    • 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 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

    • 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.

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

    • Dynamic Radar Cruise Control System

    • Pre-crash Safety System

    • Forward Recognition Camera System

    • LKA/LDA System

    		 -

    • Forward recognition camera

    • Windshield glass

    		 Adjust forward recognition camera

    • Dynamic Radar Cruise Control System

    • Pre-crash Safety System

    • Forward Recognition Camera System

    • LKA/LDA System

    • Road Sign Assist System

    • Adaptive High Beam System

    • Automatic High Beam System

    		 -
    Engine stop and start ECU*1

    • 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*1

    • Reset air conditioning information

    • Learning air conditioning information

    Starter assembly*1

    Note

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

    		 Clear number of starter operations

    • Yaw rate and acceleration sensor (airbag sensor assembly)*1*2

    • Yaw rate and acceleration sensor*1*3

    • Clear the zero point calibration data

    • Deceleration sensor zero point calibration
    Battery*1

    • Integrated current value initialization

    • Switch battery type

    • Automatic transaxle assembly*1

    • Automatic transaxle fluid*1

    		 Bleed the oil pump assembly with motor (automatic transaxle assembly)
    Automatic transaxle assembly

    Perform the following procedures in the order shown:


    1. Reset memory

    2. Input transaxle compensation code into ECM

    3. Perform road test to allow ECM to learn

    • Large shift shock

    • Deterioration of fuel efficiency

    		 -

    • Valve body assembly

    • Shift solenoid valve SL3 and/or SL4

    Perform the following procedures in the order shown:


    1. Reset memory

    2. Reset transaxle compensation code

    3. Perform road test to allow ECM to learn
    Shift solenoid valve SL1 and/or SL2 Perform road test to allow ECM to learn

    ECM

    (If possible, read the transaxle compensation code from the previous ECM)

    		 Possible to read transaxle compensation code

    Perform the following procedures in the order shown:


    1. Reset memory

    2. Transfer transaxle compensation code

    3. Perform road test to allow ECM to learn
    Impossible to read transaxle compensation code

    Perform the following procedures in the order shown:


    1. Reset memory

    2. Reset transaxle compensation code

    3. Perform road test to allow ECM to learn
    Automatic transaxle assembly

    Perform the following procedures in the order shown:


    1. Input transaxle compensation code into ECM

    2. Perform road test to allow ECM to learn

    • Large shift shock

    • Deterioration of fuel efficiency

    		 -

    • Valve body assembly

    • Shift solenoid valve SL3, SL4 and/or SL5

    Perform the following procedures in the order shown:


    1. Reset transaxle compensation code

    2. Perform road test to allow ECM to learn
    Shift solenoid valve SL1 and/or SL2 Perform road test to allow ECM to learn

    ECM

    (If possible, read the transaxle compensation code from the previous ECM)

    		 Possible to read transaxle compensation code

    Perform the following procedures in the order shown:


    1. Transfer transaxle compensation code

    2. Perform road test to allow ECM to learn
    Impossible to read transaxle compensation code

    Perform the following procedures in the order shown:


    1. Reset transaxle compensation code

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

    Perform the following procedures in the order shown:


    1. Reset memory

    2. Perform road test to allow ECM to learn
    4WD ECU assembly*9 Clear zero point calibration data Dynamic Torque Control AWD System -

    • Acceleration sensor (airbag sensor assembly)*2

    • Acceleration sensor (yaw rate sensor assembly)*3

    • Clear zero point calibration data

    • Perform yaw rate and acceleration sensor zero point calibration
    Absorber control ECU Perform registration of vehicle identification information

    • Interrupts damping force control

    • DTCs are stored

    		 -

    • Tire pressure warning ECU and receiver (Electrical key and tire pressure monitoring system receiver assembly)*7

    • Tire pressure warning ECU and receiver (Tire pressure monitoring system receiver assembly)*8

    • 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 (brake actuator assembly) Operate the electric parking brake switch assembly Parking brake indicator light (red) blinks when the engine switch is first turned on (IG) -
    Perform yaw rate and acceleration sensor zero point calibration and store system information

    • VSC disabled or malfunctions

    • DTCs are stored

    • Slip indicator light illuminates

    • ABS warning light illuminates

    • Theft deterrent system (tilt sensor)*3

    		 -

    • Yaw rate and acceleration sensor (airbag sensor assembly)*2

    • Yaw rate and acceleration sensor*3

    Perform the following procedures in the order shown:


    1. Clear zero point calibration data and system information

    2. Perform yaw rate and acceleration sensor zero point calibration and store system information
    Power steering ECU assembly

    • Perform torque sensor zero point calibration

    • Assist Map Writing

    • DTCs are stored

    • Steering effort different between turning steering wheel left and right

    • EPS warning light illuminates

    		 -
    Electric power steering column sub-assembly Perform torque sensor zero point calibration

    • Radio receiver assembly*4

    • Telematics transceiver*5

    		 Vehicle contract setting

    • G-BOOK service

    • Emergency call service

    		 -
    Radio receiver assembly*4 Download necessary data Some G-BOOK service content will be unavailable. -
    Telematics transceiver*13 Register vehicle information Emergency call service -
    Mobilephone battery*13 Reset mobilephone battery condition
    Steering sensor Steering angle neutral point (Initialize intelligent clearance sonar system)

    • Intelligent Clearance Sonar System

    • LEXUS Parking Assist-sensor System (w/ Intelligent Clearance Sonar System)

    		 -
    Clearance warning ECU assembly

    • Ultrasonic sensor detection angle

    • Steering angle neutral point

    • Registration of bumper type

    • Ultrasonic sensor detection angle registration

    • Front bumper assembly

    • Rear bumper assembly

    • Suspension, tires, etc.*10

    • Ultrasonic sensor

    • Ultrasonic sensor detection angle

    • Ultrasonic sensor detection angle registration
    Clearance warning ECU assembly Registration of bumper type LEXUS Parking Assist-sensor System (w/o Intelligent Clearance Sonar 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)
    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)
    Radio receiver assembly Parking assist monitor system initialization Parking Assist Monitor System (w/ Parallel Parking Assist Function) -
    Steering sensor

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

    • Steering angle setting

    • Suspension, tires, etc.*10

    • Rear television camera assembly

    		 Rear television camera assembly optical axis (Back camera position setting)
    Steering sensor

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

    • Steering angle setting

    		 Parking Assist Monitor System (w/o Parallel Parking Assist Function) -
    Rear television camera assembly

    • Parking assist monitor system initialization

    • Rear television camera assembly optical axis (Back camera position setting)
    Suspension, tires, etc.*10 Rear television camera assembly optical axis (Back camera position setting)
    Blind spot monitor sensor Blind spot monitor beam axis inspection

    • Intelligent Clearance Sonar System

    • Blind Spot Monitor System

    		 -
    Inner rear view mirror assembly

    Re-registration of codes in the garage door opener system


    • Register transmitter code

    • Rolling code systems

    		 Garage Door Opener System -
    Steering sensor Steering angle neutral point (Initialize panoramic view monitor system) Panoramic View Monitor System -
    Parking assist ECU

    • Parking assist ECU initialization

    • Adjust steering angle
    Rear television camera assembly Rear television camera view adjustment

    • Front television camera assembly

    • Front bumper assembly

    • Radiator grille

    		 Front television camera view adjustment

    • Side television camera assembly LH

    • Outer rear view mirror assembly LH

    • Side television camera assembly RH

    • Outer rear view mirror assembly RH

    		 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
    Suspension, tires, etc.*10

    • Parking assist ECU initialization

    • Adjust steering angle

    • Certification ECU (smart key ECU assembly)

    • ID code box (immobiliser code ECU)

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

    • Electrical key transmitter sub-assembly

    • ECM

    • Main body ECU (multiplex network body ECU)

    • Telematics transceiver

    		 Perform code registration (Immobiliser system)

    • Wireless Door Lock Control System

    • Entry and Start System

    • Engine start function

    • Steering Lock System

    • Telematics System

    		 See Service Bulletin for the registration method.

    • Occupant detection ECU

    • Front passenger seat*12

    		 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)

    		 -

    • 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 (w/ Memory) -

      for Rear Power Seat Control System (for Second Row)

    • Fold seat control ECU (for LH side)

    • Fold seat control ECU (for RH side)

    • Rear seatback frame sub-assembly LH

    • Rear seatback frame sub-assembly RH

    		 Initial position memorization Rear power seat function (for Second Row) -

      for Rear Power Seat Control System (for Third Row)

    • Fold seat control ECU (LH seat)

    • Fold seat control ECU (RH seat)

    • No. 2 seatback frame sub-assembly LH

    • No. 2 seatback frame sub-assembly RH

    • No. 2 seat cushion frame sub-assembly LH

    • No. 2 seat cushion frame sub-assembly RH

    		 Initial position memorization Rear power seat function (for Third Row) -

    • Air conditioning amplifier assembly

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

    • No. 1 blower damper servo sub-assembly

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

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

    • Rear No. 1 cooling unit damper servo sub-assembly*14

    • Rear No. 2 cooling unit damper servo sub-assembly*14

    		 Initialize servo motor (Air conditioning system) DTCs are stored -

    • Door window regulator assembly

    • Power window regulator motor sub-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

    • Catch protection function

    • Window open warning function

    		 -

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

    • Slide 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

    		 -

    • Sliding roof ECU (sliding roof drive gear)

    • Slide roof housing panel

    • Slide roof rail sub-assembly

    • Sliding roof glass sub-assembly

    		 Initialize panoramic moon roof system (for sliding roof)

    • Auto operation function

    • Jam protection function

    • Key-off operation function

    • Key-linked function

    • Wireless transmitter linked function

    • Sliding roof open warning function

    		 -

    • Roof sunshade ECU (sliding roof drive gear assembly)

    • Sunshade trim sub-assembly

    • Slide roof rail sub-assembly

    		 Initialize panoramic moon roof system (for roof sunshade)

    • Auto operation function

    • Jam protection function

    • Key-off operation function
    Multiplex network door ECU*11 Reset back door close position Power back door system -
    Headlight ECU sub-assembly LH

    • Synchronize vehicle information

    • Initialize headlight ECU sub-assembly LH

    • Adaptive High Beam System

    • Automatic Headlight Beam Level Control System

    		 -
    Rear height control sensor sub-assembly RH Initialize headlight ECU sub-assembly LH
    Suspension, tires, etc.*10

    • *1: w/ Stop and Start System

    • *2: w/ Optitron Meter Type

    • *3: w/ TFT Meter Type

    • *4: w/ G-BOOK System

    • *5: w/ Telematics Transceiver for G-BOOK

    • *6: w/o Telematics Transceiver for G-BOOK

    • *7: for Tire Pressure Warning ECU and Receiver Integrated with Electrical Key Receiver

    • *8: for Tire Pressure Warning ECU and Receiver (Stand Alone)

    • *9: When the 4WD ECU assembly is replaced with a new one, calibration is unnecessary.

    • *10: The vehicle height changes because of suspension or tire replacement.

    • *11: w/ Power Back Door System

    • *12: w/ Occupant Classification System

    • *13: w/ Telematics Transceiver except G-BOOK

    • *14: w/ Rear Air Conditioning System