maintenance TOYOTA MIRAI 2020 (in English) Owner's Manual

3637-2. Maintenance
MIRAI_OM_USA_OM62073U
7
Maintenance and care
Seat belts
• Do the seat belts operatesmoothly?
• The seat belts should not be dam-
aged.
Seats• Do the seat controls operate prop-erly?
Steering wheel
• Does the steering wheel rotatesmoothly?
• 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 operatesmoothly?
Hood• Does the hood lock system workproperly?
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.

3647-3. Do-it-yourself maintenance
MIRAI_OM_USA_OM62073U
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. 3 7 4 )•Grease
• Conventional wrench (for terminal clamp bolts)
Brake fluid level
( P. 3 7 2 )
• FMVSS No.116 DOT 3 or SAE J1703 brake fluid, or
FMVSS No.116 DOT 4 or SAE J1704 brake fluid
• Rag or paper towel
• Funnel (used only for adding brake fluid)
Inverter coolant
level ( P. 370)
• “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.
For the U.S.A.:
“Toyota Super Long Life Coolant” is pre-mixed with
50% coolant and 50% deionized water.
For Canada:
“Toyota Super Long Life Coolant” is pre-mixed with
55% coolant and 45% deionized water.
• Funnel (used only for adding coolant)
Fuses ( P. 402)• Fuse with same amperage rating as original
Light bulbs
( P. 4 0 5 )
Radiator and con-
denser (
P. 371)
Tire inflation
pressure
( P. 393)• Tire pressure gauge
• Compressed air source
Washer fluid
( P. 3 7 3 )• Water or washer fluid containing antifreeze (for win-
ter use)
• Funnel (used only for adding water or washer fluid)

3657-3. Do-it-yourself maintenance
MIRAI_OM_USA_OM62073U
7
Maintenance and care
WARNING
The motor 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 motor compartment
● Be careful not to touch the high-voltage parts or hydrogen-rela ted parts.
● Make sure that the “READY” indicator is off.
● Keep hands, clothing and tools away from the moving fans.
● Be careful not to touch the motor, inverter, radiator, etc., ri ght after driving
as they may be hot. Coolant and other fluids may also be hot.
● Do not leave anything that may burn easily, such as paper and r ags, in the
motor compartment.
● Do not smoke, cause sparks or expose an open flame to the 12-volt bat-
tery. 12-volt battery fumes are flammable.
● Be extremely cautious when working on the 12-volt battery. It c ontains poi-
sonous and corrosive sulfuric acid.
● Never touch, disassemble, remove or replace the high-voltage parts,
cables and their connectors. It can cause severe burns or electric shock
that may result in death or serious injury.
■ When working near the electric cooling fans or radiator grille
Be sure the power switch is off.
With the power switch in ON mode, the electric cooling fans may automati-
cally start to run if the air conditioning is on and/or the coolant temperature
is high. ( P. 371)
■ 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 motor wear
due to dirt in the air.

3667-3. Do-it-yourself maintenance
MIRAI_OM_USA_OM62073U
Hood
Pull the hood lock release lever.
The hood will pop up slightly.
Pull up the auxiliary catch lever
and lift the 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 vehic le is in motion
and cause an accident, which may result in death or serious inj ury.

3677-3. Do-it-yourself maintenance
MIRAI_OM_USA_OM62073U
7
Maintenance and care
Positioning a floor jack
◆Front
◆Rear
When using a floor jack, follow the instructions in the manual
provided with the jack and perform the operation safely.
When raising your vehicle with a floor jack, position the jack cor-
rectly. Improper placement may damage your vehicle or cause
injury.

3687-3. Do-it-yourself maintenance
MIRAI_OM_USA_OM62073U
WARNING
■When raising your vehicle
Make sure to observe the following precautions to reduce the po ssibility of
death or serious injury:
● Make sure to set the floor jack properly at the jack point.
Raising the vehicle with an improperly positioned floor jack wi ll damage
the vehicle and may cause the vehicle to fall off the floor jac k.
● Do not jack up on the hydrogen tanks nor the rear suspension.
Rear suspension
Hydrogen tanks
Front

3697-3. Do-it-yourself maintenance
MIRAI_OM_USA_OM62073U
7
Maintenance and care
Motor compartment
Washer fluid tank (P. 373)
Brake fluid reservoir ( P. 372)
Inverter coolant reservoir ( P. 370)
Fuse box ( P. 402)
Fuel cell stack coolant radiator
( P. 371) Inverter coolant radiator
( P. 371)
Condenser ( P. 371)
Electric cooling fans
Fuel cell stack coolant reser-
voir ( P. 370)
Fuel cell stack coolant sub
radiator ( P. 371)

3707-3. Do-it-yourself maintenance
MIRAI_OM_USA_OM62073U
The coolant level is satisfactory if it is between the “FULL” a nd “LOW”
lines on the reservoir when the fuel cell system is cold.
“FULL” line
“LOW” line
If the level is on or below the
“LOW” line, contact your Toyota
dealer.
The coolant level is satisfact ory if it is between the “FULL” a nd “LOW”
lines on the reservoir when the fuel cell system is cold.
Inverter coolan t reservoir cap
“FULL” line
“LOW” line
If the level is on or below the
“LOW” line, add coolant up to the
“FULL” line.
■ Inverter coolant selection
Only use “Toyota Super Long Life Coolant” or a similar high quality ethylene
glycol based non-silicate, non-amine, non-nitrite, and non-bora te coolant with
long-life hybrid organic acid technology.
For the U.S.A.: “Toyota Super Long Life Coolant” is a mixture o f 50% coolant and
50% deionized water. (Minimum temperature: -31
F [-35C])
For Canada: “Toyota Super Long Life Coolant” is a mixture of 55 % coolant and
45% deionized water. (Minimum temperature: -44
F [-42C])
For more details about inverter coolant, contact your Toyota dealer.
Fuel cell stack coolant
NOTICE
■ Fuel cell stack coolant
An exclusive coolant for the fuel cell system is filled in the fuel cell stack
coolant reservoir. Do not use any substitute. It may damage you r vehicle.
Inverter coolant

3717-3. Do-it-yourself maintenance
MIRAI_OM_USA_OM62073U
7
Maintenance and care
■If the inverter coolant level drops within a short time of repl enishing
Visually check the radiators, hoses, inverter coolant reservoir cap, drain cock
and water pump.
If you cannot find a leak, have your Toyota dealer test the cap and check for
leaks in the cooling system.
Check the radiator and condenser and clear away any foreign objects.
If either of the above parts is extremely dirty or you are not sure of
their condition, have your vehic le inspected by your Toyota dea ler.
WARNING
■When the fuel cell system is hot
Do not remove the coolant reservoir caps.
The cooling system may be under pressure and may spray hot coolant if the
cap is removed, causing serious injuries, such as burns.
NOTICE
■When adding coolant
Coolant is neither plain water nor straight antifreeze. The cor rect mixture of
water and antifreeze must be used to provide proper lubrication , corrosion
protection and cooling. Be sure to read the antifreeze or coolant label.
■ If you spill coolant
Be sure to wash it off with water to prevent it from damaging p arts or paint.
Radiator and condenser
WARNING
■When the fuel cell system is hot
Do not touch the radiator or condenser as they may be hot and c ause seri-
ous injuries, such as burns.

3727-3. Do-it-yourself maintenance
MIRAI_OM_USA_OM62073U■
Checking fluid level
The brake fluid level should be
between the “MAX” and “MIN”
lines on the tank.
“MAX”
“MIN”
■Adding fluid
Make sure to check the fluid ty pe and prepare the necessary ite m.
■Brake fluid can absorb moisture from the air
Excess moisture in the brake fluid can cause a dangerous loss o f braking effi-
ciency. Use only newly opened brake fluid.
Brake fluid
Fluid typeFMVSS No.116 DOT 3 or SAE J1703 brake fluid, or
FMVSS No.116 DOT 4 or SAE J1704 brake fluid
ItemClean funnel
WARNING
■ When filling the reservoir
Take care as brake fluid can harm your hands and eyes and damag e
painted surfaces.
If fluid gets on your hands or in your eyes, flush the affected area with clean
water immediately.
If you still experience discomfort, see a doctor.
NOTICE
■ If the fluid level is low or high
It is normal for the brake fluid level to go down slightly as t he brake pads
wear out or when the fluid level in the accumulator is high.
If the reservoir needs frequent refilling, there may be a serio us problem.