LEMON Manuals: Even more car manuals for everyone
Home >> Lexus >> 2025 >> NX 350h >> Repair and Diagnosis >> External Pages >> Different car >> Section 108 (Engine Mechanical System - Service Information (1 Of 4)) >> Cylinder Head Gasket >> Removal [03/2022 - 03/2024] >> Caution / Notice / Hint

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 cylinder head gasket 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 assembly*3
  • Replacement of camshaft timing gear assembly*3
  • 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
 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
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, UB80F Initialization:
Refer to INITIALIZATION [11/2021 - ]
for UB80E, UB80F 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
  • Initialization*5*6
  • Tire Position Identification*5*6
 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) 
  1. 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 [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 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 (REMOVAL) 

Fig 1: Cylinder Head Gasket Removal Components [03/2022 - 03/2024] (1 Of 9)
GTY1077150Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Callout - Procedure Part Name Code
1 ENGINE ASSEMBLY TO ENGINE STAND - See step  1 - -
2 ENGINE HANGERS - - - -
3 V-RIBBED BELT 16361A See step  3 - -
4 GENERATOR ASSEMBLY 27060 - - -
5 COMPRESSOR ASSEMBLY WITH PULLEY 88310 See step  5 - -
6 NO. 2 ENGINE COVER 12602C - - -
7 V-RIBBED BELT TENSIONER ASSEMBLY 16620D See step  7 - -
Fig 2: Cylinder Head Gasket Removal Components [03/2022 - 03/2024] (2 Of 9)
GTY1129866Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Callout - Procedure Part Name Code
8 NO. 2 WATER BY-PASS PIPE SUB-ASSEMBLY 16207 - - -
9 FLOW SHUTTING VALVE (WATER BY-PASS HOSE ASSEMBLY) 16260 - - -
10 NO. 2 WATER HOSE CLAMP BRACKET 16575B - - -
11 NO. 1 EXHAUST MANIFOLD HEAT INSULATOR 17167 See step  11 - -
12 MANIFOLD STAY 17118 See step  12 - -
13 EXHAUST MANIFOLD (TWC: Front Catalyst) 17141 See step  13 - -
14 EXHAUST MANIFOLD TO HEAD GASKET 17173 - - -
*a Type A: x 3
Type B: x 5		 - -
• Non-reusable part - -
Fig 3: Cylinder Head Gasket Removal Components [03/2022 - 03/2024] (3 Of 9)
GTY1075911Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Callout - Procedure Part Name Code
15 NO. 6 WATER BY-PASS HOSE 16283 - - -
16 THROTTLE BODY WITH MOTOR ASSEMBLY 22030 See step  16 - -
17 NO. 5 WATER BY-PASS HOSE 16282 See step  15 - -
18 THROTTLE BODY GASKET 22271 - - -
19 DISCONNECT NO. 3 WATER BY-PASS HOSE 16267 - - -
20 DISCONNECT NO. 4 WATER BY-PASS HOSE 16281 - - -
21 EGR COOLER ASSEMBLY 25680 - - -
22 EGR VALVE GASKET 25627 - - -
23 NO. 1 EGR COOLER GASKET 25685 - - -
24 NO. 1 EGR PIPE SUB-ASSEMBLY 25601 See step  24 - -
25 EGR VALVE ADAPTER GASKET 25629 - - -
26 EGR INLET GASKET 25628 - - -
27 REMOVE NO. 4 WATER BY-PASS HOSE 16281 - - -
28 EGR VALVE ASSEMBLY 25620 See step  28 - -
29 REMOVE NO. 3 WATER BY-PASS PIPE 16279 See step  29 - -
30 NO. 2 WATER BY-PASS PIPE 16278 See step  30 - -
31 INTAKE MANIFOLD 17111 See step  31 - -
32 NO. 1 INTAKE MANIFOLD TO HEAD GASKET 17177 - - -
*A w/ Stud Bolt *B w/o Stud Bolt
*C for Type A *D for Type B
• Non-reusable part - -
Fig 4: Cylinder Head Gasket Removal Components [03/2022 - 03/2024] (4 Of 9)
GTY1075139Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Callout - Procedure Part Name Code
33 FUEL TUBE SUB-ASSEMBLY 23910A See step  33 - -
34 NO. 1 FUEL PIPE SUB-ASSEMBLY 23801P See step  34 - -
35 FUEL (ENGINE ROOM SIDE) PUMP ASSEMBLY 23100X See step  35 - -
36 FUEL PUMP SPACER GASKET 23224D - - -
37 FUEL PUMP LIFTER ASSEMBLY 23470 - - -
38 NO. 7 WATER BY-PASS HOSE 16295 - - -
39 FUEL DELIVERY PIPE SUB-ASSEMBLY 23807 See step  39 - -
40 NO. 1 DELIVERY PIPE SPACER 23807V - - -
41 INJECTOR VIBRATION INSULATOR 23291 - - -
42 NO. 5 ENGINE WIRE 82125N - - -
43 PORT FUEL INJECTOR ASSEMBLY 23250F See step  43 - -
44 WIRE HARNESS - - - -
45 FUEL DELIVERY PIPE 23814B See step  45 - -
46 DIRECT FUEL INJECTOR ASSEMBLY 23250E See step  46 - -
47 NOZZLE HOLDER CLAMP 23695A - - -
48 NO. 3 FUEL INJECTOR BACK-UP RING 23258 See step  48 - -
49 NO. 1 FUEL INJECTOR BACK-UP RING 23256 - - -
50 C-RING - - - -
51 INJECTOR VIBRATION INSULATOR 23291A - - -
52 FUEL INJECTOR SEAL 23255A See step  52 - -
*1 FUEL PIPE CLAMP *2 FUEL PUMP FLANGE
• Non-reusable part - -
Fig 5: Cylinder Head Gasket Removal Components [03/2022 - 03/2024] (5 Of 9)
GTY1076112Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Callout - Procedure Part Name Code
53 IGNITION COIL ASSEMBLY 19500 See step  53 - -
54 ENGINE OIL LEVEL DIPSTICK GUIDE 11452 See step  54 - -
55 PURGE VALVE (PURGE VSV) 25860 - - -
56 OIL PRESSURE CONTROL VALVE ASSEMBLY 15250 See step  56 - -
57 TIMING GEAR COVER INSULATOR 11336A See step  57 - -
58 CAM TIMING OIL CONTROL SOLENOID ASSEMBLY 15370 See step  58 - -
59 CAM TIMING OIL CONTROL SOLENOID O-RING 15370A See step  59 - -
60 CAM TIMING CONTROL MOTOR WITH EDU ASSEMBLY 13090D See step  60 - -
61 CAM TIMING CONTROL MOTOR O-RING 13090E - - -
62 VACUUM PUMP ASSEMBLY 29300 See step  62 - -
63 NO. 1 VACUUM PUMP O RING 29343 - - -
64 ENGINE MOUNTING BRACKET RH 12315A See step  64 - -
*1 ENGINE OIL LEVEL DIPSTICK - -
• Non-reusable part * Precoated part
Fig 6: Cylinder Head Gasket Removal Components [03/2022 - 03/2024] (6 Of 9)
GTY1204166Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Callout - Procedure Part Name Code
65 NO. 1 WATER BY-PASS HOSE 16261Z - - -
66 NO. 2 WATER BY-PASS HOSE 16264D - - -
Fig 7: Cylinder Head Gasket Removal Components [03/2022 - 03/2024] (7 Of 9)
GTY1075568Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Callout - Procedure Part Name Code
67 CRANKSHAFT PULLEY ASSEMBLY 13470 See step  67 - -
68 WATER OUTLET 16331 See step  68 - -
69 WATER OUTLET GASKET 16341 - - -
70 WATER BY-PASS OUTLET 16305E See step  70 - -
71 WATER OUTLET PIPE GASKET 16345 - - -
72 CAMSHAFT POSITION SENSOR (for Intake Side) 11102A See step  72 - -
73 CAMSHAFT POSITION SENSOR (for Exhaust Side) 11102A See step  73 - -
74 CYLINDER HEAD COVER SUB-ASSEMBLY 11201 See step  74 - -
75 SPARK PLUG TUBE GASKET 11193 See step  75 - -
76 NO. 2 TIMING CHAIN COVER ASSEMBLY 11320B See step  76 - -
77 TIMING CHAIN COVER OIL SEAL 11301C See step  77 - -
*1 CRANKSHAFT PULLEY BOLT - -
• Non-reusable part * Precoated part
Fig 8: Cylinder Head Gasket Removal Components [03/2022 - 03/2024] (8 Of 9)
GTY1130281Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Callout - Procedure Part Name Code
78 SET NO. 1 CYLINDER TO TDC (COMPRESSION) - See step  78 - -
79 OIL PUMP DRIVE CHAIN SUB-ASSEMBLY 13507A See step  79 - -
80 CAMSHAFT TIMING GEAR ASSEMBLY 13050 See step  80 - -
81 CHAIN SUB-ASSEMBLY 13506 - - -
82 NO. 1 CHAIN TENSIONER ASSEMBLY 13540 See step  82 - -
83 CHAIN TENSIONER SLIPPER 13559 - - -
84 NO. 1 CHAIN VIBRATION DAMPER 13561 - - -
85 CAMSHAFT TIMING EXHAUST GEAR ASSEMBLY 13070A See step  85 - -
86 TIMING CHAIN COVER ASSEMBLY 11310 See step  86 - -
*A Type A *B Type B
*1 CHAIN TENSIONER PLATE *2 CHAIN DAMPER SPRING
*3 OIL PUMP DRIVE SPROCKET *4 OIL PUMP DRIVE SHAFT SPROCKET
*5 CRANKSHAFT TIMING SPROCKET *6 CAMSHAFT TIMING VALVE ASSEMBLY
Fig 9: Cylinder Head Gasket Removal Components [03/2022 - 03/2024] (9 Of 9)
GTY1076100Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Callout - Procedure Part Name Code
87 FUEL PUMP LIFTER GUIDE 23477 See step  87 - -
88 CAMSHAFT HOUSING SUB-ASSEMBLY 11103 See step  88 - -
89 CAMSHAFT BEARING CAP - See step  89 - -
90 CAMSHAFT 13511 - - -
91 NO. 2 CAMSHAFT 13512 - - -
92 NO. 1 VALVE ROCKER ARM SUB-ASSEMBLY 13801 - - -
93 VALVE LASH ADJUSTER ASSEMBLY 13750 - - -
94 VALVE STEM CAP 13716 - - -
95 CYLINDER HEAD SUB-ASSEMBLY 11101 See step  95 - -
96 CYLINDER HEAD GASKET 11115 - - -
97 INSPECT CYLINDER HEAD SET BOLT 11101A See step  97 - -
98 INSPECT CYLINDER HEAD SUB-ASSEMBLY 11101 See step  98 - -
*1 CYLINDER HEAD SET BOLT *2 PLATE WASHER
*3 NO. 1 CAMSHAFT BEARING CAP *4 NO. 2 CAMSHAFT BEARING CAP
*5 NO. 3 CAMSHAFT BEARING CAP *6 NO. 4 CAMSHAFT BEARING CAP
• Non-reusable part - -
scientia non olet · About LEMON Manuals