LEMON Manuals: Even more car manuals for everyone
Home >> Lexus >> 2023 >> NX 250 AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 48 (Engine Mechanical System - Service Information (1 Of 4)) >> Cylinder Head Gasket >> Removal [03/2024 - ] >> Caution / Notice / Hint

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 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 - ]
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 engine coolant temperature sensor (for Water Inlet Housing Side)
  • Replacement of Engine coolant temperature sensor (for Outlet Side)
  • Engine coolant temperature sensor (for Cylinder Head 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
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
  • 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 [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 - ]
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 - ]
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 - ]
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: Cylinder Head Gasket Removal Components [03/2024 - ] (1 Of 5)
GTY1080635Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Callout - Procedure Part Name Code
1 CAMSHAFT HOUSING SUB-ASSEMBLY 11103 - - -
2 DRIVE SHAFT BEARING BRACKET 43457 - - -
3 FUEL DELIVERY GUARD 23825 - - -
4 NO. 1 TURBO WATER HOSE 16284 - - -
5 NO. 3 WATER BY-PASS HOSE 16267 - - -
6 NO. 4 TURBO WATER HOSE 16287 - - -
7 NO. 4 WATER BY-PASS HOSE 16281N - - -
8 NO. 5 WATER BY-PASS HOSE 16282 - - -
9 ENGINE OIL LEVEL DIPSTICK GUIDE 11452 See step  9 - -
10 INTAKE MANIFOLD WITH INTERCOOLER ASSEMBLY - - - -
11 WATER CONTROL VALVE 16342 - - -
12 FRONT WATER BY-PASS JOINT 16355 - - -
13 WATER OUTLET GASKET 16341 - - -
*1 ENGINE OIL LEVEL DIPSTICK *2 GASKET
• Non-reusable part - -
Fig 2: Cylinder Head Gasket Removal Components [03/2024 - ] (2 Of 5)
GTY1204386Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Callout - Procedure Part Name Code
14 NO. 1 TURBO INSULATOR 17271 - - -
15 MANIFOLD STAY 17118 - - -
16 NO. 1 TURBO OIL PIPE 15481 - - -
17 NO. 1 TURBO OIL OUTLET GASKET 15472 - - -
18 TURBOCHARGER SUB-ASSEMBLY 17201 - - -
*1 TURBO OIL INLET GASKET *2 OIL PIPE UNION BOLT
*3 GASKET *4 EXHAUST MANIFOLD TO HEAD GASKET
• Non-reusable part - -
Fig 3: Cylinder Head Gasket Removal Components [03/2024 - ] (3 Of 5)
GTY1203866Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Callout - Procedure Part Name Code
19 NO. 2 WATER BY-PASS PIPE 16278 - - -
20 FUEL DELIVERY PIPE 23814B See step  20 - -
21 FUEL DELIVERY SPACER 23891 - - -
22 INJECTOR VIBRATION INSULATOR 23291 - - -
23 NO. 5 ENGINE WIRE 82125N - - -
24 PORT FUEL INJECTOR ASSEMBLY 23250F See step  24 - -
• Non-reusable part - -
Fig 4: Cylinder Head Gasket Removal Components [03/2024 - ] (4 Of 5)
GTY1204715Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Callout - Procedure Part Name Code
25 WIRE HARNESS - See step  25 - -
26 WATER INLET HOUSING 16323 - - -
27 NO. 2 MANIFOLD STAY 17119 - - -
28 HEATER WATER HOSE BRACKET 87264 - - -
29 SPARK PLUG 19100P See step  29 - -
30 OIL COOLER ASSEMBLY 15710 - - -
31 OIL COOLER GASKET 15785 - - -
32 OIL COOLER PIPE GASKET 16258B - - -
• Non-reusable part - -
Fig 5: Cylinder Head Gasket Removal Components [03/2024 - ] (5 Of 5)
GTY1205626Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Callout - Procedure Part Name Code
33 CYLINDER HEAD SUB-ASSEMBLY 11101 See step  33 - -
34 CYLINDER HEAD GASKET 11115 - - -
35 INSPECT CYLINDER HEAD SET BOLT 11101A See step  35 - -
36 INSPECT CYLINDER HEAD SUB-ASSEMBLY 11101 See step  36 - -
*1 CYLINDER HEAD SET BOLT *2 PLATE WASHER
• Non-reusable part - -
scientia non olet · About LEMON Manuals