G16E-GTS (ENGINE MECHANICAL): CYLINDER HEAD GASKET: REMOVAL; 2025 MY GR Corolla [09/2024

Last Modified: 12-11-2024	6.11:8.1.0	Doc ID: RM100000002Q97Q
Model Year Start: 2025	Model: GR Corolla	Prod Date Range: [09/2024 - ]
Title: G16E-GTS (ENGINE MECHANICAL): CYLINDER HEAD GASKET: REMOVAL; 2025 MY GR Corolla [09/2024 - ]

REMOVAL

CAUTION / NOTICE / HINT

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 Procedure After Parts Removed/Installed/Replaced

Replaced Part or Performed Procedure	Necessary Procedure	Effect/Inoperative Function when Necessary Procedure not Performed	Link
1:w/ Steering Lock Function 2: Not necessary when ECM replaced with new one. 3: If transaxle compensation code read from ECM 4: If transaxle compensation code not read from ECM
Replacement of ECM	Perform Vehicle Identification Number (VIN) or frame number registration	MIL illuminates
	ECU configuration	-
	Update ECU security key	Vehicle Control History (RoB) are stored
	Heavy Knock History	-
	ECU communication ID registration (Immobiliser system)	Engine start function
	Code registration (Smart Key System (for Gasoline Model, Start Function))	Wireless Door Lock Control System (for Gasoline Model with Smart Key System) Smart Key System (for Gasoline Model, Entry Function) Smart Key System (for Gasoline Model, Start Function) Steering lock function*1
	for UC80F Perform reset memory2 Transfer transaxle compensation code3 Reset transaxle compensation code*4 Perform road test to allow ECM to learn	Large shift shock Deterioration of fuel efficiency	Initialization: Registration:
Replacement of throttle body with motor assembly Cleaning the deposits from the throttle body with motor assembly Replacement of engine assembly Replacement of cylinder head sub-assembly Replacement of camshaft (for intake or exhaust camshaft) Replacement of camshaft timing gear assembly Replacement of camshaft timing exhaust gear assembly Replacement of fuel pump assembly (for high pressure side) Replacement of fuel pressure sensor (for high pressure side) Replacement of air fuel ratio sensor Replacement of engine coolant temperature sensor Replacement of spark plug Replacement of ignition coil assembly Replacement of knock control sensor Replacement of turbocharger sub-assembly Gas leaks from exhaust system is repaired	Inspection After Repair	Poor idle, etc. Engine start function, etc.
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: Registration:
Automatic transaxle fluid	ATF thermal degradation estimate reset	The value of the Data List item "ATF Thermal Degradation Estimate" is not estimated correctly
Front wheel alignment adjustment	Perform "Reset Memory" Perform "Calibration"	VSC is disabled or malfunctions DTCs are output Slip indicator light illuminates ABS warning light illuminates
Tire	ECU Data Initialization (When performing tire replacement after RoB code X2104 is output)	Active Torque Split AWD System

NOTICE:

This procedure includes the removal of small-head bolts. Refer to Small-Head Bolts of Basic Repair Hint to identify the small-head bolts.

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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 Procedures are not Performed	Necessary Procedures	Link
Front Camera System	Drive the vehicle straight ahead at 35 km/h (22 mph) or more for 5 seconds or more.

Learning completes when vehicle is operated normally

Effect/Inoperative Function When Necessary Procedures are not Performed	Necessary Procedures	Link
Power door lock control system Back door opener	Perform door unlock operation with door control switch or electrical key transmitter sub-assembly switch.

PROCEDURE

1. REMOVE INTAKE CAMSHAFT SUB-ASSEMBLY

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2. REMOVE NO. 1 CAMSHAFT BEARING CAP

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3. REMOVE NO. 5 CAMSHAFT BEARING CAP

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4. REMOVE NO. 1 VALVE ROCKER ARM SUB-ASSEMBLY

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5. REMOVE VALVE LASH ADJUSTER ASSEMBLY

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6. REMOVE VALVE STEM CAP

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7. REMOVE CYLINDER HEAD SUB-ASSEMBLY

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8. REMOVE CYLINDER HEAD GASKET

(a) Remove the cylinder head gasket from the cylinder block sub-assembly.

9. INSPECT CYLINDER HEAD SET BOLT

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10. INSPECT CYLINDER HEAD SUB-ASSEMBLY

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REMOVAL

CAUTION / NOTICE / HINT

Necessary Procedure After Parts Removed/Installed/Replaced

for UC80F

PROCEDURE