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	Panoramic View Monitor System	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 - ]
This procedure includes the removal of small-head bolts. Refer to Small-Head Bolts of Basic Repair Hint to identify the small-head bolts.
Refer to PRECAUTION [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 (REMOVAL)

Fig 1: Engine Unit Removal Components [03/2024 - ] (1 Of 6)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Callout - Procedure		Part Name Code
1	DRIVE SHAFT BEARING BRACKET	43457	-	-	-
2	NO. 2 ENGINE COVER SUB-ASSEMBLY	12602D	-	-	-
3	PURGE VALVE (PURGE VSV)	25860D	-	-	-
4	NO. 1 VENTILATION PRESSURE SENSOR HOSE	12266B	-	-	-
5	AIR TUBE ASSEMBLY	17360A	See step 5	-	-
6	FUEL DELIVERY GUARD	23825	-	-	-
7	NO. 2 FUEL VAPOR FEED HOSE	23827D	-	-	-
8	NO. 1 TURBO WATER HOSE	16284	-	-	-
9	NO. 3 WATER BY-PASS HOSE	16267	-	-	-
10	NO. 4 TURBO WATER HOSE	16287	-	-	-
11	NO. 4 WATER BY-PASS HOSE	16281N	-	-	-
12	NO. 5 WATER BY-PASS HOSE	16282	-	-	-
13	ENGINE OIL LEVEL DIPSTICK GUIDE	11452	See step 13	-	-
14	INTAKE MANIFOLD WITH INTERCOOLER ASSEMBLY	-	-	-	-
15	WATER CONTROL VALVE	16342	-	-	-
16	FRONT WATER BY-PASS JOINT	16355	-	-	-
17	WATER OUTLET GASKET	16341	-	-	-

*1	ENGINE OIL LEVEL DIPSTICK	*2	VACUUM HOSE SUB-ASSEMBLY
*3	AIR TUBE SUPPORT	*4	GASKET
•	Non-reusable part	-	-

Fig 2: Engine Unit Removal Components [03/2024 - ] (2 Of 6)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Callout - Procedure		Part Name Code
18	CONVERTER WITH CATALYST ASSEMBLY	17400M	-	-	-
19	VACUUM REGULATING VALVE ASSEMBLY	25819	-	-	-
20	COMPRESSOR INLET ELBOW SUB-ASSEMBLY	17203B	See step 20	-	-
21	NO. 1 TURBO INSULATOR	17271	-	-	-
22	NO. 2 TURBO WATER HOSE	16285	-	-	-
23	NO. 3 TURBO WATER HOSE	16286	-	-	-
24	NO. 1 HEAT INSULATOR BRACKET	17163	-	-	-
25	MANIFOLD STAY	17118	-	-	-
26	NO. 1 TURBO OIL PIPE	15481	-	-	-
27	NO. 1 TURBO OIL OUTLET GASKET	15472	-	-	-
28	TURBOCHARGER SUB-ASSEMBLY	17201	-	-	-
29	WATER OUTLET STAY	16337A	-	-	-

*1	NO. 2 TURBO INSULATOR	*2	OIL PIPE UNION BOLT
*3	GASKET	*4	TURBO OIL INLET GASKET
*5	EXHAUST MANIFOLD TO HEAD GASKET	-	-
•	Non-reusable part	-	-

Fig 3: Engine Unit Removal Components [03/2024 - ] (3 Of 6)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Callout - Procedure		Part Name Code
30	FUEL TUBE SUB-ASSEMBLY	23901	See step 30	-	-
31	NO. 1 FUEL PIPE SUB-ASSEMBLY	23801P	See step 31	-	-
32	FUEL (ENGINE ROOM SIDE) PUMP ASSEMBLY	23100X	See step 32	-	-
33	FUEL PUMP SPACER GASKET	23224D	-	-	-
34	FUEL PUMP LIFTER ASSEMBLY	23470	-	-	-
35	NO. 2 WATER BY-PASS PIPE	16278	-	-	-

*1	FUEL PUMP SPACER	*2	EFI FUEL PIPE CLAMP (Fuel Delivery Pipe Side)
•	Non-reusable part	-	-

Fig 4: Engine Unit Removal Components [03/2024 - ] (4 Of 6)

Callout - Procedure		Part Name Code
36	FUEL DELIVERY PIPE	23814B	See step 36	-	-
37	FUEL DELIVERY SPACER	23891	-	-	-
38	INJECTOR VIBRATION INSULATOR	23291	-	-	-
39	NO. 5 ENGINE WIRE	82125N	-	-	-
40	PORT FUEL INJECTOR ASSEMBLY	23250F	See step 40	-	-

•

Non-reusable part

Fig 5: Engine Unit Removal Components [03/2024 - ] (5 Of 6)

Callout - Procedure		Part Name Code
41	IGNITION COIL ASSEMBLY	19500	See step 41	-	-
42	WIRE HARNESS	-	See step 42	-	-
43	WATER INLET HOUSING	16323	-	-	-
44	NO. 2 MANIFOLD STAY	17119	-	-	-

•

Non-reusable part

Fig 6: Engine Unit Removal Components [03/2024 - ] (6 Of 6)

Callout - Procedure		Part Name Code
45	EXHAUST PIPE HEAT INSULATOR	17435B	-	-	-
46	WATER BY-PASS HOSE	16261	-	-	-
47	WATER BY-PASS PIPE SUB-ASSEMBLY	16206	-	-	-
48	WATER BY-PASS GASKET	16347D	-	-	-
49	HEATER WATER HOSE BRACKET	87264	-	-	-
50	ENGINE COOLANT TEMPERATURE SENSOR (for Cylinder Block Side)	89422	See step 50	-	-
51	KNOCK CONTROL SENSOR	89615	See step 51	-	-
52	PCV VALVE (VENTILATION VALVE SUB-ASSEMBLY)	12204	-	-	-
53	CRANKSHAFT POSITION SENSOR	11401G	See step 53	-	-
54	WIRE HARNESS CLAMP BRACKET	-	See step 54	-	-

•

Non-reusable part