Caution / Notice / Hint

WARNING: This page is about a different car, the 2025 Lexus NX 250, 2024 Lexus NX 250, 2023 Lexus NX 250, and 2022 Lexus NX 250. 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 - ]
	Code registration	Engine start function	Refer to REGISTRATION [11/2021 - ]
Replacement of engine assembly Gas leak from exhaust system is repaired Replacement of throttle body with motor assembly Cleaning the deposits from the throttle body assembly Replacement of cam timing control motor with EDU assembly3 Replacement of camshaft timing gear assembly3 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 EGR valve assembly Replacement of knock control sensor Replacement of piston or piston ring	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	for UB80E, UB80FInitialization: Refer to INITIALIZATION [11/2021 - ] for UB80E, UB80FRegistration: 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 [11/2021 - 03/2023] , or refer to WORK PROCEDURE [03/2023 - 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 [11/2021 - 03/2024]
for A25A-FKS (Type B) Tire	ECU Data Initialization (When performing tire replacement after RoB code X2104 is output)	Dynamic Torque Control AWD System (for T24A-FTS, A25A-FKS (Type B))	Refer to CALIBRATION [11/2021 - 03/2023] , or 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 POWER STEERING ECU INITIAL SETTING [11/2021 - ]
Replacement of front bumper assembly*3	Front television camera view adjustment	Panoramic View Monitor System	Refer to CALIBRATION [11/2021 - 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 [11/2021 - 03/2024]
	Perform headlight ECU sub-assembly LH initialization	Lighting System (w/ Automatic Headlight Beam Level Control System)	Refer to INITIALIZATION [11/2021 - 03/2022] , or 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 auxiliary 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
Front Camera System	Drive the vehicle straight ahead at 15 km/h (10 mph) or more for 1 second or more.	Refer to INITIALIZATION [11/2021 - ]
Adaptive High Beam System
Lighting System (EXT)
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 [11/2021 - 03/2023] , or refer to PRECAUTION [03/2023 - 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 Block Disassembly Components With Torque Specifications [11/2021 - 03/2024]

Callout - Procedure		Part Name Code
1	NO. 1 VENTILATION CASE	12211	See step 1	-	-
2	INSPECT CONNECTING ROD THRUST CLEARANCE	-	See step 2	-	-
3	INSPECT CONNECTING ROD OIL CLEARANCE	-	See step 3	-	-
4	PISTON WITH CONNECTING ROD	-	See step 4	-	-
5	CONNECTING ROD BEARING	13041	-	-	-
6	INSPECT CRANKSHAFT THRUST CLEARANCE	-	See step 6	-	-
7	CRANKSHAFT BEARING CAP	-	See step 7	-	-
8	CRANKSHAFT	13411	-	-	-
9	CRANKSHAFT THRUST WASHER	11791	-	-	-
10	CRANKSHAFT BEARING	11711	-	-	-
11	PISTON RING SET	13011	See step 11	-	-
12	PISTON PIN	-	See step 12	-	-
13	NO. 1 OIL NOZZLE SUB-ASSEMBLY	15708	See step 13	-	-
14	NO. 2 OIL NOZZLE SUB-ASSEMBLY	15709	See step 14	-	-
15	RING PIN	-	See step 15	-	-
16	STRAIGHT PIN	-	See step 16	-	-

*1	CONNECTING ROD BEARING CAP	-	-
	Tightening torque for "Major areas involving basic vehicle performance such as moving/turning/stopping": N.m (kgf/cm, ft.lbf)	•	Non-reusable part
*T1	1st: 10 (102, 7) 2nd: 38 (387, 28) 3rd: Turn 90°	-	-