Caution / Notice / Hint

WARNING: This page is about a different car, the 2025 Lexus NX 350, 2024 Lexus NX 350, 2023 Lexus NX 350, and 2022 Lexus NX 350. However, it is still accessible from the selected car via links, so may be relevant.

The necessary procedures (adjustment, calibration, initialization or registration) that must be performed after parts are removed and installed, or replaced during engine unit removal/installation are shown below.

NECESSARY PROCEDURES AFTER PARTS REMOVED/INSTALLED/REPLACED

Replaced Part or Performed Procedure	Necessary Procedure	Effect/Inoperative Function when Necessary Procedure not Performed	Link
Replacement of ECM	Update ECU security key	Vehicle Control History (RoB) are stored	Refer to UPDATE ECU SECURITY KEY [11/2021 - ]
	Perform Vehicle Identification Number (VIN) registration	DTC is output	Refer to REGISTRATION [11/2021 - ]
	ECU configuration (Only necessary after replacement)	-	Refer to ECU CONFIGURATION [11/2021 - ]
	Switch Specification Information	Vehicle control history (RoB) [X263E] is stored	Refer to INITIALIZATION [11/2021 - ]
	Heavy knock history Save history Write history	-	Refer to REGISTRATION [11/2021 - ]
	Code registration	Engine start function	Refer to REGISTRATION [11/2021 - ]
Replacement of engine assembly Gas leak from exhaust system is repaired Replacement of camshaft timing gear assembly Replacement of cylinder head sub-assembly Replacement of camshaft (for intake or exhaust camshaft) Replacement of camshaft timing exhaust gear assembly Replacement of port fuel injector assembly Replacement of direct fuel injector assembly Replacement of fuel (engine room side) pump assembly (for high pressure side) Replacement of spark plug Replacement of ignition coil assembly Replacement of knock control sensor Replacement of engine coolant temperature sensor (for Water Inlet Housing Side) Replacement of engine coolant temperature sensor (for Cylinder Head Side) Replacement of Engine coolant temperature sensor (for Outlet Side)	Inspection after repair	Poor idle, etc. Engine start function, etc.	Refer to INITIALIZATION [11/2021 - ]
Replacement of starter assembly*1	Clear the number of starter operations	Stop and Start System	Refer to REGISTRATION [11/2021 - ]
Replacement of battery	Integrated current value initialization	Stop and Start System	Refer to REGISTRATION [11/2021 - ]
Replacement of automatic transaxle assembly	Perform reset memory Input transaxle compensation code into ECM Perform road test to allow ECM to learn	Large shift shock Deterioration of fuel efficiency	Initialization: Refer to INITIALIZATION [11/2021 - ] Registration: Refer to REGISTRATION [11/2021 - ]
Replacement of ECM (If transaxle compensation code read from ECM)	Perform reset memory*2 Transfer transaxle compensation code Perform road test to allow ECM to learn
Replacement of ECM (If transaxle compensation code not read from ECM)	Perform reset memory*2 Reset transaxle compensation code Perform road test to allow ECM to learn
Replacement of automatic transaxle fluid	ATF thermal degradation estimate reset	The value of the Data List item "ATF Thermal Degradation Estimate" is not estimated correctly	Refer to INITIALIZATION [11/2021 - ]
Tires	Initialization56 Tire Position Identification56	Tire Pressure Warning System	Refer to Procedures Necessary When Replacing Parts (for Tire Pressure Warning System) table below Refer to WORK PROCEDURE [03/2024 - ]
	Rear television camera assembly optical axis (Back camera position setting)	Parking Assist Monitor System	Refer to CALIBRATION [11/2021 - ]
	Parking assist ECU initialization	Panoramic View Monitor System	Refer to CALIBRATION [03/2024 - ]
	Parking assist ECU initialization	Advanced Park	Refer to CALIBRATION [03/2024 - ]
	ECU Data Initialization (When performing tire replacement after RoB code X2104 is output)	Dynamic Torque Control AWD System	Refer to CALIBRATION [03/2023 - ]
Wheel alignment adjustment	Perform reset memory Perform "Calibration"	DTCs are stored ABS warning light illuminates Slip indicator light illuminates Electronically controlled brake system does not operate correctly	Refer to RESET MEMORY / CALIBRATION [11/2021 - ]
Steering intermediate shaft assembly*4	Automatic rack centering	-	Refer to AUTOMATIC RACK CENTERING [11/2021 - ]
Replacement of front bumper assembly*3	Front television camera view adjustment	Panoramic View Monitor System	Refer to CALIBRATION [03/2024 - ]
Replacement of front bumper assembly*3	Front television camera view adjustment	Advanced Park	Refer to CALIBRATION [03/2024 - ]
Suspension parts	Rear television camera assembly optical axis (Back camera position setting)	Parking Assist Monitor System	Refer to CALIBRATION [11/2021 - ]
	Parking assist ECU initialization	Panoramic View Monitor System	Refer to CALIBRATION [03/2024 - ]
	Parking assist ECU initialization	Advanced Park	Refer to CALIBRATION [03/2024 - ]
	Perform headlight ECU sub-assembly LH initialization	Lighting System (w/ Automatic Headlight Beam Level Control System)	Refer to INITIALIZATION [03/2022 - ]

*1: When the starter assembly is replaced, "ST No. 1 relay" must be also replaced.

*2: Not necessary when ECM replaced with new one

*3: Even when not replacing the part, it is necessary to perform the specified necessary procedures after installation.

*4: If matchmarks were not placed when removing parts related to steering operation, perform automatic rack centering.

*5: Also necessary after performing a tire rotation.

*6: It is not necessary to perform this procedure if the tire pressure warning valve and transmitters are installed to the same location.

NOTE:

To prevent the key from being locked in the vehicle, make sure to enter e-latch inspection mode and enable the manual release handle before disconnecting the cable from the negative (-) battery terminal.

Refer to INSPECTION MODE PROCEDURE [11/2021 - ]

HINT:

When the cable is disconnected / reconnected to the battery terminal, systems temporarily stop operating. However, each system has a function that completes learning the first time the system is used.

LEARNING COMPLETES WHEN VEHICLE IS DRIVEN

Effect/Inoperative Function when Necessary Procedure not Performed	Necessary Procedure	Link
Lighting System (EXT)	Drive the vehicle straight ahead at 15 km/h (10 mph) or more for 1 second or more.	Refer to INITIALIZATION [11/2021 - ]
Front Camera System
Adaptive High Beam System
Stop and Start System	Idle the engine for approximately 5 to 60 minutes or drive the vehicle until stop and start control is permitted.	Refer to PRECAUTION [03/2024 - ]

LEARNING COMPLETES WHEN VEHICLE IS OPERATED NORMALLY

Effect/Inoperative Function when Necessary Procedure not Performed	Necessary Procedure	Link
E-latch System Back door opener	Perform door unlock operation with door control switch or electrical key transmitter sub-assembly switch.	Refer to INITIALIZATION [11/2021 - ]
Power Back Door System	Reset back door close position	Refer to INITIALIZATION [11/2021 - ]
Air Conditioning System	After the ignition switch is turned to ON, the servo motor standard position is recognized.	-

COMPONENTS (DISASSEMBLY)

Fig 1: Cylinder Head Disassembly Components [03/2024 - ]

Callout - Procedure		Part Name Code
1	VALVE SPRING RETAINER LOCK	13741A	See step 1	-	-
2	VALVE SPRING RETAINER	-	-	-	-
3	INTAKE VALVE COMPRESSION SPRING	13711M	-	-	-
4	EXHAUST VALVE COMPRESSION SPRING	13715H	-	-	-
5	INTAKE VALVE	13711	-	-	-
6	EXHAUST VALVE	13715	See step 6	-	-
7	INTAKE VALVE STEM OIL SEAL	13711E	See step 7	-	-
8	EXHAUST VALVE STEM OIL SEAL	13715A	See step 8	-	-
9	INTAKE VALVE SPRING SEAT	13734A	See step 9	-	-
10	EXHAUST VALVE SPRING SEAT	13734B	See step 10	-	-
11	NO. 1 WITH HEAD STRAIGHT SCREW PLUG	11117E	See step 11	-	-
12	NO. 2 WITH HEAD STRAIGHT SCREW PLUG	11117F	See step 12	-	-
13	NO. 3 WITH HEAD STRAIGHT SCREW PLUG	11117G	See step 13	-	-
14	STUD BOLT	-	See step 14	-	-
15	DISPOSE OF EXHAUST VALVE	13715	See step 15	-	-
16	INTAKE VALVE GUIDE BUSH	11122	See step 16	-	-
17	EXHAUST VALVE GUIDE BUSH	11126	See step 17	-	-
18	RING PIN	11115A	See step 18	-	-

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Non-reusable part

Precoated part