2021 TOYOTA AVALON HYBRID maintenance

3946-2. Maintenance
General maintenance
Listed below are the general maintenance items that should be
performed at the intervals specified in the “Owner’s Warranty
Information Booklet” or “Owner’s Manual Supplement/Sched-
uled Maintenance Guide”. It is recommended that any problem
you notice should be brought to the attention of your Toyota
dealer or qualified service shop for advice.
Engine compartment
ItemsCheck points
Brake fluidIs the brake fluid at the correct
level? (P. 409)
CoolantIs the coolant at the correct level?
(P. 407)
Engine oilIs the engine oil at the correct level?
(P. 404)
Exhaust systemThere should not be any fumes or
strange sounds.
Radiator/condenser
The radiator and condenser should
be free from foreign objects.
(P. 408)
Washer fluidIs there sufficient washer fluid?
(P. 410)
Tr u nk
ItemsCheck points
12-volt battery Check the connections. (P. 4 1 1 )

3956-2. Maintenance
6
Maintenance and care
Vehicle interior
ItemsCheck points
Accelerator pedal
• The accelerator pedal should
move smoothly (without uneven
pedal effort or catching).
Hybrid transmission “Park” mecha-
nism• When parked on a slope and the
shift lever is in P, is the vehicle
securely stopped?
Brake pedal
• Does the brake pedal move
smoothly?
• Does the brake pedal have appro-
priate clearance from the floor?
(P. 507)
• Does the brake pedal have the
correct amount of free play?
(P. 507)
Brakes
• The vehicle should not pull to one
side when the brakes are applied.
• The brakes should work effec-
tively.
• The brake pedal should not feel
spongy.
• The brake pedal should not get
too close to the floor when the
brakes are applied.
Head restraints (adjustable type)• Do the head restraints move
smoothly and lock securely?
Indicators/buzzers• Do the indicators and buzzers
function properly?
Lights • Do all the lights come on?
Parking brake
• Does the parking brake operate
normally?
• When parked on a slope and the
parking brake is on, is the vehicle
securely stopped?

3966-2. Maintenance
Seat belts
• Do the seat belts operate
smoothly?
• The seat belts should not be dam-
aged.
Seats• Do the seat controls operate prop-
erly?
Steering wheel
• Does the steering wheel rotate
smoothly?
• Does the steering wheel have the
correct amount of free play?
• There should not be any strange
sounds coming from the steering
wheel.
Vehicle exterior
ItemsCheck points
ItemsCheck points
Doors/trunk• Do the doors/trunk operate
smoothly?
Engine hood• Does the engine hood lock system
work properly?
Fluid leaks
• There should not be any signs of
fluid leakage after the vehicle has
been parked.
Tires
• Is the tire inflation pressure cor-
rect?
• The tires should not be dam-
aged or excessively worn.
• Have the tires been rotated
according to the maintenance
schedule?
• The wheel nuts should not be
loose.
Windshield wipers
• The wiper blades should not show
any signs of cracking, splitting,
wear, contamination or deforma-
tion.
• The wiper blades should clear the
windshield without streaking or
skipping.

3976-2. Maintenance
6
Maintenance and care
WARNING
■If the hybrid system is operating
Turn the hybrid system off and ensure that there is adequate ventilation
before performing maintenance checks.

3986-2. Maintenance
The OBD system determines that a problem exists somewhere in the
emission control system. Your vehicle may not pass the I/M test and
may need to be repaired. Contact your Toyota dealer to service the
vehicle.
●When the 12-volt battery is disconnected or discharged
Readiness codes that are set during ordinary driving are erased.
Also, depending on your driving habits, the readiness codes may
not be completely set.
●When the fuel tank cap is loose
The malfunction indicator lamp comes on indicating a temporary
malfunction and your vehicle may not pass the I/M test.
The error code in the OBD system will not be cleared unless the vehi-
cle is driven 40 or more times.
Contact your Toyota dealer to prepare the vehicle for re-testing.
Emission inspection and maintenance (I/M)
programs
Some states have vehicle emission inspection programs which
include OBD (On Board Diagnostics) checks. The OBD system
monitors the operation of the emission control system.
If the malfunction indicator lamp comes on
Your vehicle may not pass the I/M test in the following situations:
When the malfunction indicator lamp still remains on after sev-
eral driving trips
If your vehicle does not pass the I/M test

399
6
Maintenance and care
6-3. Do-it-yourself maintenance
Do-it-yourself ser vice precautions
If you perform maintenance by yourself, be sure to follow the
correct procedure as given in these sections.
ItemsParts and tools
12-volt battery
condition
(P. 411)•Grease
• Conventional wrench (for terminal clamp bolts)
Brake fluid level
(P. 409)
• SAE J1703 or FMVSS No.116 DOT 3
SAE J1704 or FMVSS No.116 DOT 4
• Rag or paper towel
• Funnel (used only for adding brake fluid)
Engine/power
control unit cool-
ant level
(P. 407)
• “Toyota Super Long Life Coolant” or a similar high
quality ethylene glycol-based non-silicate, non-
amine, non-nitrite and non-borate coolant with long-
life hybrid organic acid technology
“Toyota Super Long Life Coolant” is pre-mixed with
50% coolant and 50% deionized water.
• Funnel (used only for adding coolant)
Engine oil level
(P. 404)• “Toyota Genuine Motor Oil” or equivalent
• Rag or paper towel
• Funnel (used only for adding engine oil)
Fuses (P. 442)• Fuse with same amperage rating as original
Hybrid battery
(traction battery)
air intake vent
(P. 434)
• Vacuum cleaner, etc.
• Phillips screwdriver
Radiator/con-
denser (
P. 408)

4006-3. Do-it-yourself maintenance
Tire inflation
pressure
(P. 427)• Tire pressure gauge
• Compressed air source
Washer fluid
(P. 410)• Water or washer fluid containing antifreeze (for win-
ter use)
• Funnel (used only for adding water or washer fluid)
WARNING
The engine compartment contains many mechanisms and fluids that may
move suddenly, become hot, or become electrically energized. To avoid death
or serious injury, observe the following precautions.
■When working on the engine compartment
●Make sure that the “ACCESSORY” or “IGNITION ON” on the multi-infor-
mation display and the “READY” indicator are both off.
●Keep hands, clothing and tools away from the moving fan and engine
drive belt.
●Be careful not to touch the engine, power control unit, radiator, exhaust
manifold, etc. right after driving as they may be hot. Oil and other fluids
may also be hot.
●Do not leave anything that may burn easily, such as paper and rags, in the
engine compartment.
●Do not smoke, cause sparks or expose an open flame to fuel. Fuel fumes
are flammable.
■When working near the electric cooling fan or radiator grille
Be sure the power switch is off.
With the power switch in ON mode, the electric cooling fan may automati-
cally start to run if the air conditioning is on and/or the coolant temperature
is high. (P. 408)
■Safety glasses
Wear safety glasses to prevent flying or falling material, fluid spray, etc.
from getting in your eyes.
NOTICE
■If you remove the air cleaner filter
Driving with the air cleaner filter removed may cause excessive engine wear
due to dirt in the air.
ItemsParts and tools

4016-3. Do-it-yourself maintenance
6
Maintenance and care
Pull the hood lock release lever.
The hood will pop up slightly.
Pull up the auxiliary catch lever
and lift the hood.
■Open hood warning buzzer
If the vehicle reaches a speed of 3 mph (5 km/h), the master warning light
flashes and a buzzer sounds to indicate that the hood is not fully closed.
Hood
Release the lock from the inside of the vehicle to open the hood.
1
2
WARNING
■Pre-driving check
Check that the hood is fully closed and locked.
If the hood is not locked properly, it may open while the vehicle is in motion
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