Toyota Mirai (2022 year). Manual in english - page 24

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7-2. Maintenance

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7-2.Maintenance

■

Repair and replacement

It is recommended that genuine 

Toyota parts be used for repairs to 

ensure performance of each sys-

tem. If non-Toyota parts are used in 

replacement or if a repair shop other 

than a Toyota dealer performs 

repairs, confirm the warranty cover-

age.

■

Allow inspection and repairs to 

be performed by a Toyota 

dealer

●

Toyota technicians are well-

trained specialists and are kept up 

to date with the latest service 

information. They are well 

informed about the operation of all 

systems on your vehicle.

●

Keep a copy of the repair order. It 

proves that the maintenance that 

has been performed is under war-

ranty coverage. If any problem 

should arise while your vehicle is 

under warranty, your Toyota 

dealer will promptly take care of it.

General maintenance should be 
performed on a daily basis. This 
can be done by yourself or by a 
Toyota dealer.

Scheduled maintenance should 
be performed at specified inter-
vals according to the mainte-
nance schedule.

For details about maintenance 
items and schedules, refer to the 
“Scheduled Maintenance Guide” or 
“Owner’s Manual Supplement”.

You can perform some mainte-
nance procedures by yourself.
Please be aware that do-it-your-
self maintenance may affect 

Maintenance require-

ments

To ensure safe and econom-
ical driving, day-to-day care 
and regular maintenance 
are essential. It is the 
owner’s responsibility to 
perform regular checks. 
Toyota recommends the 
maintenance below.

WARNING

■

If your vehicle is not properly 

maintained

Improper maintenance could 

result in serious damage to the 

vehicle and possible death or seri-

ous injury.

■

Handling of the 12-volt bat-

tery

●

Oils, fuels and fluids contained 

in vehicles as well as waste pro-

duced by component wear con-

tain or emit chemicals known to 

the State of California to cause 

cancer and birth defects or 

other reproductive harm. Avoid 

exposure and wash any 

affected area immediately.

●

12-volt battery posts, terminals 

and related accessories con-

tain lead and lead compounds 

which are known to cause brain 

damage. Wash your hands after 

handling. (



P.400)

General maintenance

Scheduled maintenance

Do-it-yourself mainte-
nance

388

7-2. Maintenance

warranty coverage.

The use of Toyota repair manuals is 
recommended.
For details about warranty cover-
age, refer to the separate “Owner’s 
Warranty Information Booklet” or 
“Owner’s Manual Supplement”.

General maintenance

Listed below are the general 
maintenance items that 
should be performed at the 
intervals specified in the 
“Owner’s Warranty Informa-
tion 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.

WARNING

■

If the fuel cell system is oper-

ating

Turn the fuel cell system off and 

ensure that there is adequate 

ventilation before performing 

maintenance checks.

Fuel cell unit compart-
ment

Items

Check points

Brake fluid

Is the brake fluid at 
the correct level? 
(



P.399)

Coolant

Is the coolant at 
the correct level? 
(



P.397)

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Radiator/con-
denser

The radiator and 
condenser should 
be free from for-
eign objects. 
(



P.398)

Washer fluid

Is there sufficient 
washer fluid? 
(



P.399)

Trunk

Items

Check points

12-volt battery

Check the connec-
tions. (



P.400)

Vehicle interior

Items

Check points

Accelerator 
pedal

• The accelerator 

pedal should 
move smoothly 
(without uneven 
pedal effort or 
catching).

Transmission 
“Park” mecha-
nism

• When parked on 

a slope and the 
shift position is in 
P, is the vehicle 
securely 
stopped?

Items

Check points

Brake pedal

• Does the brake 

pedal move 
smoothly?

• Does the brake 

pedal have 
appropriate 
clearance from 
the floor?

• Does the brake 

pedal have the 
correct amount 
of free play?

Brakes

• The vehicle 

should not pull to 
one side when 
the brakes are 
applied.

• The brakes 

should work 
effectively.

• 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

• Do the head 

restraints move 
smoothly and 
lock securely?

Indica-
tors/buzzers

• Do the indica-

tors and buzzers 
function prop-
erly?

Lights

• Do all the lights 

come on?

Items

Check points

390

7-2. Maintenance

Parking brake

• Does the park-

ing brake oper-
ate normally?

• When parked on 

a slope and the 
parking brake is 
on, is the vehicle 
securely 
stopped?

Seat belts

• Do the seat belts 

operate 
smoothly?

• The seat belts 

should not be 
damaged.

Seats

• Do the seat con-

trols operate 
properly?

Steering wheel

• Does the steer-

ing wheel rotate 
smoothly?

• Does the steer-

ing wheel have 
the correct 
amount of free 
play?

• There should not 

be any strange 
sounds coming 
from the steer-
ing wheel.

Items

Check points

Vehicle exterior

Items

Check points

Doors/trunk

• Do the 

doors/trunk oper-
ate smoothly?

Hood

• Does the 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 infla-

tion pressure 
correct?

• The tires should 

not be damaged 
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, split-
ting, wear, con-
tamination or 
deformation.

• The wiper blades 

should clear the 
windshield with-
out streaking or 
skipping.

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7-3.Do-it-yourself maintenance

Do-it-yourself service 

precautions

If you perform maintenance 
by yourself, be sure to fol-
low the correct procedure 
as given in these sections.

Maintenance

Items

Parts and tools

12-volt battery 
condition 
(



P.400)

• Grease
• Conventional 

wrench (for ter-
minal clamp 
bolts)

Brake fluid 
level (



P.399)

• FMVSS No.116 

DOT 3 or SAE 
J1703 brake fluid
FMVSS No.116 
DOT 4 or SAE 
J1704 brake fluid

• Rag or paper 

towel

• Funnel (used 

only for adding 
brake fluid)

Inverter cool-
ant level 
(



P.397)

• “Toyota Super 

Long Life Cool-
ant” or a similar 
high quality eth-
ylene glycol-
based non-sili-
cate, non-amine, 
non-nitrite and 
non-borate cool-
ant with long-life 
hybrid organic 
acid technology
For the U.S.A.:
“Toyota Super 
Long Life Cool-
ant” is pre-mixed 
with 50% cool-
ant and 50% 
deionized water.
For Canada:
“Toyota Super 
Long Life Cool-
ant” is pre-mixed 
with 55% cool-
ant and 45% 
deionized water.

• Funnel (used 

only for adding 
coolant)

Fuses 
(



P.425)

• Fuse with same 

amperage rating 
as original

• Flathead screw-

driver

Headlight aim 
(



P.428)

• Phillips-head 

screwdriver

Radiator and 
condenser 
(



P.398)



Items

Parts and tools

392

7-3. Do-it-yourself maintenance

Tire inflation 
pressure 
(



P.415)

• Tire pressure 

gauge

• Compressed air 

source

Washer fluid 
(



P.399)

• Water or washer 

fluid containing 
antifreeze (for 
winter use)

• Funnel (used 

only for adding 
water or washer 
fluid)

WARNING

The fuel cell unit compartment 

contains many mechanisms and 

fluids that may move suddenly, 

become hot, or become electri-

cally energized. To avoid death or 

serious injury, observe the follow-

ing precautions.

■

When working on the fuel cell 

unit compartment

●

Be careful not to touch the high-

voltage parts or hydrogen-

related parts.

●

Make sure that the “READY” 

indicator is off.

●

Keep hands, clothing and tools 

away from the moving fan.

●

Be careful not to touch the 

motor, inverter, radiator, etc. 

right 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 

rags, in the fuel cell unit com-

partment.

Items

Parts and tools

●

Do not smoke, cause sparks or 

expose an open flame to the 12-

volt battery. 12-volt battery 

fumes are flammable.

●

Be extremely cautious when 

working on the 12-volt battery. It 

contains poisonous and corro-

sive sulfuric acid.

●

Take care because brake fluid 

can harm your hands or eyes 

and damage painted surfaces. If 

fluid gets on your hands or in 

your eyes, flush the affected 

area with clean water immedi-

ately.

If you still experience discom-

fort, consult a doctor.

●

Never touch, disassemble, 

remove or replace the high-volt-

age parts, cables and their con-

nectors. It can cause severe 

burns or electric shock that may 

result in death or serious injury.

■

When working near the elec-

tric cooling fan or radiator 

grille

Be sure the power switch is off.

With the power switch in ON, the 

electric cooling fan may automati-

cally start to run if the air condi-

tioning is on and/or the coolant 

temperature is high. (



P.398)

■

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.

393

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1

Pull the hood lock release 
lever.

The hood will pop up slightly.

2

Pull up the auxiliary catch 
lever and lift the hood.

■

Front

Hood

Opening the hood

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 and cause an accident, 

which may result in death or seri-

ous injury.

Positioning a floor 

jack

When using a floor jack, fol-
low the instructions in the 
manual provided with the 
jack and perform the opera-
tion safely.
When raising your vehicle 
with a floor jack, position 
the jack correctly. Improper 
placement may damage 
your vehicle or cause injury.

Location of the jack point

394

7-3. Do-it-yourself maintenance

■

Rear

WARNING

■

When raising your vehicle

Make sure to observe the follow-

ing precautions to reduce the pos-

sibility 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 
will damage the vehicle and may 
cause the vehicle to fall off the 
floor jack.

●

Do not jack up on the hydrogen 

tanks nor the rear suspension.



Type A



Type B

Front

Suspension

Hydrogen tanks

395

7-3. Do-it-yourself maintenance

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Inverter coolant reservoir (



P.398)

Fuel cell stack coolant reservoir (



P.398)

Fuse boxes (



P.425)

Brake fluid reservoir (



P.399)

Washer fluid tank (



P.399)

Inverter coolant radiator (



P.398)

Electric cooling fan

Condenser (



P.398)

Fuel cell stack coolant radiator (



P.398)

■

12-volt battery



P.400

Fuel cell unit compartment

Components

396

7-3. Do-it-yourself maintenance

■

Removing the fuel cell unit compartment cover



Outside



Front

■

Installing the clips

1

Push up center portion 

2

Insert

3

Press

■

Removing the fuel cell 
stack cover

Remove the fuel cell stack 
cover.

Fuel cell unit compartment cover

NOTICE

■

Checking the fuel cell unit 

compartment cover after 

installation

Make sure that the cover is 

securely installed in its original 

position.

Fuel cell stack cover

397

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■

Installing the fuel cell stack 
cover

Install the fuel cell stack cover.

1

Attach the hooks on the rear 
side of the fuel cell stack 
cover.

2

Insert the front side of the 
fuel cell stack cover on the 
pins.

The coolant level is satisfactory 
if it is between the “MAX” and 
“MIN” lines on the reservoir 

when the fuel cell system is 
cold.

Fuel cell stack reservoir cap

“MAX” line

“MIN” line

If the level is on or below the “MIN” 
line, add coolant up to the “MAX” 
line. (



P.476)

The coolant level is satisfactory 
if it is between the “MAX” and 
“MIN” lines on the reservoir 
when the fuel cell system is 
cold.

NOTICE

■

Checking the fuel cell stack 

cover after installation

Make sure that the cover is 

securely installed in its original 

position.

Checking the 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 dam-

age your vehicle.

Checking the inverter 
coolant

398

7-3. Do-it-yourself maintenance

Inverter coolant reservoir cap

“MAX” line

“MIN” line

If the level is on or below the “MIN” 
line, add coolant up to the “MAX” 
line. (



P.476)

■

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-

borate coolant with long-life hybrid 

organic acid technology.
U.S.A.:
“Toyota Super Long Life Coolant” is 

a mixture of 50% coolant and 50% 

deionized water. (Minimum tem-

perature: -31°F [-35°C])
Canada:
“Toyota Super Long Life Coolant” is 

a mixture of 55% coolant and 45% 

deionized water. (Minimum tem-

perature: -44°F [-42°C])
For more details about coolant, con-

tact your Toyota dealer.

■

If the inverter coolant level 

drops within a short time of 

replenishing

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 sys-

tem.

Check the radiator and con-
denser and clear away any for-
eign objects. If either of the 
above parts is extremely dirty or 
you are not sure of their condi-
tion, have your vehicle 
inspected by your Toyota dealer.

WARNING

■

When the cell system is hot

Do not remove the coolant reser-

voir caps. (



P.479)

The cooling system may be under 

pressure and may spray hot cool-

ant if the cap is removed, causing 

serious injuries, such as burns.

NOTICE

■

When adding coolant

Coolant is neither plain water nor 

straight antifreeze. The correct 

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 parts or 

paint.

Checking the radiator and 
condenser

WARNING

■

When the fuel cell system is 

hot

Do not touch the radiator or con-

denser as they may be hot and 

cause serious injuries, such as 

burns.

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■

Checking fluid level

The brake fluid level should be 
between the “MAX” and “MIN” 
lines on the tank.

Brake fluid reservoir cap

“MAX” line

“MIN” line

■

Adding fluid

Make sure to check the fluid 
type and prepare the necessary 
item.



Fluid type

FMVSS No.116 DOT 3 or SAE 
J1703 brake fluid
FMVSS No.116 DOT 4 or SAE 
J1704 brake fluid



Item

Clean funnel

■

Brake fluid can absorb moisture 

from the air

Excess moisture in the brake fluid 

can cause a dangerous loss of brak-

ing efficiency. Use only newly 

opened brake fluid.

If any washer does not work or 
the warning message appears 
on the multi-information display, 
the washer tank may be empty. 
Add washer fluid.

Checking and adding the 
brake fluid

WARNING

■

When filling the reservoir

Take care as brake fluid can harm 

your hands and eyes and damage 

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 the brake 

pads wear out or when the fluid 

level in the accumulator is high.

If the reservoir needs frequent 

refilling, there may be a serious 

problem.

Adding the washer fluid

400

7-3. Do-it-yourself maintenance

The 12-volt battery is located in 
the right-hand side of the trunk.

Remove the luggage mat: 



P.352

■

Before recharging

When recharging, the 12-volt bat-

tery produces hydrogen gas which 

is flammable and explosive. There-

fore, observe the following precau-

tions before recharging:

●

If recharging with the 12-volt bat-

tery installed on the vehicle, be 

sure to disconnect the ground 

cable.

●

Make sure the charger is off when 

connecting and disconnecting the 

charger cables to the 12-volt bat-

tery.

■

After recharging/reconnecting 

the 12-volt battery

●

Unlocking the doors using the 

smart key system may not be pos-

sible immediately after reconnect-

ing the 12-volt battery. If this 

happens, use the wireless remote 

control or the mechanical key to 

lock/unlock the doors.

●

Start the fuel cell system with the 

power switch in ACC. The fuel cell 

system may not start with the 

power switch turned off. However, 

the fuel cell system will operate 

normally from the second attempt.

WARNING

■

When adding washer fluid

Do not add washer fluid when the 

fuel cell system is hot or operating 

as washer fluid contains alcohol 

and may catch fire if spilled on the 

fuel cell system, etc.

NOTICE

■

Do not use any fluid other 

than washer fluid

Do not use soapy water or anti-

freeze instead of washer fluid.

Doing so may cause streaking on 

the vehicle’s painted surfaces, as 

well as damaging the pump lead-

ing to problems of the washer 

fluid not spraying.

■

Diluting washer fluid

Dilute washer fluid with water as 

necessary.

Refer to the freezing tempera-

tures listed on the label of the 

washer fluid bottle.

12-volt battery

Location

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●

The power switch mode is 

recorded by the vehicle. If the 12-

volt battery is reconnected, the 

vehicle will return the power 

switch mode to the status it was in 

before the 12-volt battery was dis-

connected. Make sure to turn off 

the power switch before discon-

necting the 12-volt battery. Take 

extra care when connecting the 

12-volt battery if the power switch 

mode prior to discharge is 

unknown.

●

When the 12-volt battery is recon-

nected, start the fuel cell system, 

depress the brake pedal, and con-

firm that it is possible to shift into 

each shift position.

If the system will not start even after 

multiple attempts, contact your Toy-

ota dealer.

WARNING

■

Chemicals in the 12-volt bat-

tery

The 12-volt battery contains poi-

sonous and corrosive sulfuric acid 

and may produce hydrogen gas 

which is flammable and explosive. 

To reduce the risk of death or seri-

ous injury, take the following pre-

cautions while working on or near 

the 12-volt battery:

●

Do not cause sparks by touch-

ing the 12-volt battery terminals 

with tools.

●

Do not smoke or light a match 

near the 12-volt battery.

●

Avoid contact with eyes, skin 

and clothes.

●

Never inhale or swallow electro-

lyte.

●

Wear protective safety glasses 

when working near the 12-volt 

battery.

●

Keep children away from the 

12-volt battery.

■

Where to safely charge the 

12-volt battery

Always charge the 12-volt battery 

in an open area. Do not charge 

the 12-volt battery in a garage or 

closed room where there is insuf-

ficient ventilation.

■

Emergency measures regard-

ing electrolyte

●

If electrolyte gets in your eyes

Flush your eyes with clean 

water for at least 15 minutes 

and get immediate medical 

attention. If possible, continue 

to apply water with a sponge or 

cloth while traveling to the near-

est medical facility.

●

If electrolyte gets on your skin

Wash the affected area thor-

oughly. If you feel pain or burn-

ing, get medical attention 

immediately.

●

If electrolyte gets on your 

clothes

It can soak through clothing on 

to your skin. Immediately take 

off the clothing and follow the 

procedure above if necessary.

●

If you accidentally swallow elec-

trolyte

Drink a large quantity of water 

or milk. Get emergency medical 

attention immediately.

■

When replacing the 12-volt 

battery

Use a 12-volt battery designed for 

this vehicle. Failure to do so may 

cause gas (hydrogen) to enter the 

passenger compartment, causing 

a fire or explosion.
For replacement of the 12-volt 

battery, contact your Toyota 

dealer.

402

7-3. Do-it-yourself maintenance

Make sure that the 12-volt bat-
tery terminals are not corroded 
and that there are no loose con-
nections, cracks, or loose 
clamps.

Terminals

Hold-down clamp

Check the 12-volt battery condi-
tion by indicator color.

Blue: Good condition

Red: Charging is necessary.
Have the vehicle inspected 
by your Toyota dealer.

Clear: Replacement is nec-
essary.
Have the 12-volt battery 
checked by your Toyota 
dealer.

NOTICE

■

When recharging the 12-volt 

battery

Never recharge the 12-volt bat-

tery while the fuel cell system is 

operating. Also, be sure all acces-

sories are turned off.

Exterior

Checking the 12-volt bat-
tery condition