A25A-FKS (ENGINE MECHANICAL): CYLINDER HEAD GASKET: REMOVAL; 2021 - 2022 MY Avalon [08/2020 - ]

Last Modified: 08-21-2023	6.11:8.1.0	Doc ID: RM100000001Q5A6
Model Year Start: 2021	Model: Avalon	Prod Date Range: [08/2020 - ]
Title: A25A-FKS (ENGINE MECHANICAL): CYLINDER HEAD GASKET: REMOVAL; 2021 - 2022 MY Avalon [08/2020 - ]

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 Procedures After Parts Removed/Installed/Replaced

Replaced Part or Performed Procedure	Necessary Procedure	Effect/Inoperative Function when Necessary Procedure not Performed	Link
1: When performing learning using the Techstream. Click here 2: Not necessary when ECM replaced with new one
Battery terminal is disconnected/reconnected	Perform steering sensor zero point calibration	Lane Departure Alert System (w/ Steering Control)
		Pre-collision System
		Intelligent Clearance Sonar System*1
		Lighting System (for Gasoline Model with Cornering Light)
	Memorize steering angle neutral point	Parking Assist Monitor System
	Memorize steering angle neutral point	Panoramic View Monitor System
Replacement of ECM	Vehicle Identification Number (VIN) registration	MIL comes on
Replacement of ECM	ECU communication ID registration (Immobiliser system)	Engine start function
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 with motor assembly Replacement of cam timing control motor with EDU assembly Removal and installation of a cam timing control motor with EDU assembly Replacement of camshaft timing gear assembly Removal and installation of a 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 pump assembly (for high pressure side) Replacement of ignition coil assembly Replacement of EGR valve assembly	Inspection after repair	Poor idle, etc. Engine start function, etc.
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 UB80F Initialization for UB80F Registration
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
Suspension, tires, etc. (The vehicle height changes because of suspension or tire replacement.) Replacement of front bumper assembly	Measure ultrasonic sensor detection angle Ultrasonic sensor detection angle registration	Intelligent Clearance Sonar System Intuitive Parking Assist System
Suspension, tires, etc. (The vehicle height changes because of suspension or tire replacement.)	Rear television camera assembly optical axis adjustment (Back camera position setting)	Parking Assist Monitor System	for Initialization for Calibration
Replacement of front bumper assembly	Front television camera view adjustment	Panoramic View Monitor System	for Initialization for Calibration
Suspension, tires, etc. (The vehicle height changes because of suspension or tire replacement.)	Parking assist ECU initialization Adjust steering angle Television camera assembly optical axis adjustment (Back camera position setting)	Panoramic View Monitor System	for Initialization for Calibration
Replacement of ECM	Code registration (Smart Key System (for Start Function, Gasoline Model))	Wireless Door Lock Control System Smart Key System (for Entry Function, Gasoline Model) Smart Key System (for Start Function, Gasoline Model) Steering lock function
Front wheel alignment adjustment	Perform system variant learning and acceleration sensor zero point calibration.	VSC is disabled or malfunctions DTCs are output Slip indicator light illuminates ABS warning light illuminates

NOTICE:

After the engine switch is turned off, the radio and display receiver assembly records various types of memory and settings. As a result, after turning the engine switch off, make sure to wait at least 85 seconds before disconnecting the cable from the negative (-) battery terminal. (for Audio and Visual System)
After the engine switch is turned off, the radio and display receiver assembly records various types of memory and settings. As a result, after turning the engine switch off, make sure to wait at least 85 seconds before disconnecting the cable from the negative (-) battery terminal. (for Navigation System)
This procedure includes the removal of small-head bolts. Refer to Small-Head Bolts of Basic Repair Hint to identify the small-head bolts.
Click here

PROCEDURE

1. INSTALL ENGINE ASSEMBLY TO ENGINE STAND

Click here

2. REMOVE ENGINE HANGERS

Click here

3. REMOVE V-RIBBED BELT

Click here

4. REMOVE GENERATOR ASSEMBLY

Click here

5. REMOVE COMPRESSOR ASSEMBLY WITH PULLEY

Click here

6. REMOVE NO. 2 ENGINE COVER

Click here

7. REMOVE V-RIBBED BELT TENSIONER ASSEMBLY

Click here

8. REMOVE TIMING GEAR COVER INSULATOR

Click here

9. REMOVE NO. 2 WATER BY-PASS PIPE SUB-ASSEMBLY

Click here

10. REMOVE FLOW SHUTTING VALVE (WATER BY-PASS HOSE ASSEMBLY)

Click here

11. SEPARATE NO. 1 EXHAUST MANIFOLD HEAT INSULATOR

Click here

12. REMOVE MANIFOLD STAY

Click here

13. REMOVE EXHAUST MANIFOLD (TWC: Front Catalyst)

Click here

14. REMOVE THROTTLE BODY WITH MOTOR ASSEMBLY

Click here

15. REMOVE THROTTLE BODY GASKET

Click here

16. REMOVE EGR COOLER ASSEMBLY

Click here

17. REMOVE NO. 1 EGR COOLER BRACKET

Click here

18. REMOVE NO. 1 EGR PIPE SUB-ASSEMBLY

Click here

19. REMOVE NO. 4 WATER BY-PASS HOSE

Click here

20. REMOVE EGR VALVE ASSEMBLY

Click here

21. REMOVE NO. 3 WATER BY-PASS PIPE

Click here

22. REMOVE NO. 2 WATER BY-PASS PIPE

Click here

23. REMOVE INTAKE MANIFOLD

Click here

24. REMOVE NO. 1 INTAKE MANIFOLD TO HEAD GASKET

Click here

25. DISCONNECT FUEL TUBE SUB-ASSEMBLY

Click here

26. REMOVE NO. 1 FUEL PIPE SUB-ASSEMBLY

Click here

27. REMOVE FUEL (ENGINE ROOM SIDE) PUMP ASSEMBLY (for High Pressure)

Click here

28. REMOVE NO. 7 WATER BY-PASS HOSE

Click here

29. REMOVE FUEL DELIVERY PIPE SUB-ASSEMBLY

Click here

30. REMOVE NO. 1 DELIVERY PIPE SPACER

Click here

31. REMOVE INJECTOR VIBRATION INSULATOR

Click here

32. REMOVE NO. 5 ENGINE WIRE

Click here

33. REMOVE PORT FUEL INJECTOR ASSEMBLY

Click here

34. REMOVE FUEL DELIVERY PIPE

Click here

35. REMOVE DIRECT FUEL INJECTOR ASSEMBLY

Click here

36. REMOVE FUEL INJECTOR SEAL

Click here

37. REMOVE IGNITION COIL ASSEMBLY

Click here

38. REMOVE ENGINE OIL LEVEL DIPSTICK GUIDE

Click here

39. REMOVE PURGE VALVE (PURGE VSV)

Click here

40. REMOVE OIL PRESSURE CONTROL VALVE ASSEMBLY

Click here

41. REMOVE CAMSHAFT POSITION SENSOR (for Intake Side)

Click here

42. REMOVE CAMSHAFT POSITION SENSOR (for Exhaust Side)

Click here

43. REMOVE CAM TIMING OIL CONTROL SOLENOID ASSEMBLY

Click here

44. REMOVE O-RING

Click here

45. REMOVE CAM TIMING CONTROL MOTOR WITH EDU ASSEMBLY

Click here

46. REMOVE CAM TIMING CONTROL MOTOR O-RING

Click here

47. REMOVE VACUUM PUMP ASSEMBLY

Click here

48. REMOVE CRANKSHAFT PULLEY ASSEMBLY

Click here

49. REMOVE WATER OUTLET

Click here

50. REMOVE OUTLET WATER BY-PASS SUB-ASSEMBLY

Click here

51. REMOVE CYLINDER HEAD COVER SUB-ASSEMBLY

Click here

52. REMOVE SPARK PLUG TUBE GASKET

Click here

53. REMOVE ENGINE MOUNTING BRACKET RH

Click here

54. REMOVE NO. 2 TIMING CHAIN COVER ASSEMBLY

Click here

55. REMOVE TIMING CHAIN COVER OIL SEAL

Click here

56. SET NO. 1 CYLINDER TO TDC (COMPRESSION)

Click here

57. REMOVE OIL PUMP DRIVE CHAIN SUB-ASSEMBLY

Click here

58. REMOVE CAMSHAFT TIMING GEAR ASSEMBLY

Click here

59. REMOVE CHAIN SUB-ASSEMBLY

Click here

60. REMOVE NO. 1 CHAIN TENSIONER ASSEMBLY

Click here

61. REMOVE CHAIN TENSIONER SLIPPER

Click here

62. REMOVE NO. 1 CHAIN VIBRATION DAMPER

Click here

63. REMOVE CAMSHAFT TIMING EXHAUST GEAR ASSEMBLY

Click here

64. REMOVE TIMING CHAIN COVER ASSEMBLY

Click here

65. REMOVE FUEL PUMP LIFTER GUIDE

Click here

66. REMOVE CAMSHAFT HOUSING SUB-ASSEMBLY

Click here

67. REMOVE CAMSHAFT BEARING CAP

Click here

68. REMOVE CAMSHAFT

Click here

69. REMOVE NO. 2 CAMSHAFT

Click here

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

Click here

71. REMOVE VALVE LASH ADJUSTER ASSEMBLY

Click here

72. REMOVE VALVE STEM CAP

Click here

73. REMOVE CYLINDER HEAD SUB-ASSEMBLY

Click here

74. REMOVE CYLINDER HEAD GASKET

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

75. INSPECT CYLINDER HEAD SET BOLT

Click here

76. INSPECT CYLINDER HEAD SUB-ASSEMBLY

Click here