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Toyota Mirai (2023 year). Manual in english - page 25

405

7-3. Do-it-yourself maintenance

Maintena

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nd ca

Tire inflation
pressure
(



P.428)

• Tire pressure

gauge

• Compressed air

source

Washer fluid
(



P.412)

• 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.411)

■

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.

406

7-3. Do-it-yourself maintenance

Pull the hood lock release
lever.

The hood will pop up slightly.

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

407

7-3. Do-it-yourself maintenance

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■

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

408

7-3. Do-it-yourself maintenance

Inverter coolant reservoir (



P.411)

Fuel cell stack coolant reservoir (



P.411)

Fuse boxes (



P.438)

Brake fluid reservoir (



P.412)

Washer fluid tank (



P.412)

Inverter coolant radiator (



P.411)

Electric cooling fan

Condenser (



P.411)

Fuel cell stack coolant radiator (



P.411)

■

12-volt battery



P.413

Fuel cell unit compartment

Components

409

7-3. Do-it-yourself maintenance

Maintena

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■

Removing the fuel cell unit compartment cover



Outside



Front

■

Installing the clips

Push up center portion

Insert

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

410

7-3. Do-it-yourself maintenance

■

Installing the fuel cell stack
cover

Install the fuel cell stack cover.

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

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.490)

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

411

7-3. Do-it-yourself maintenance

Maintena

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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.490)

■

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.493)

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.

412

7-3. Do-it-yourself maintenance

■

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

413

7-3. Do-it-yourself maintenance

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

Remove the luggage mat:



P.361

■

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 power switch on

the charger is off when connecting

and disconnecting the charger

cables to the 12-volt battery.

■

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

414

7-3. Do-it-yourself maintenance

●

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.

415

7-3. Do-it-yourself maintenance

Maintena

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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

416

7-3. Do-it-yourself maintenance

Check if the treadwear indica-
tors are showing on the tires.
Also check the tires for uneven
wear, such as excessive wear
on one side of the tread.

New tread

Worn tread

Treadwear indicator

The location of treadwear indicators
is shown by a “TWI” or “

” mark,

etc., molded into the sidewall of
each tire.

Replace the tires if the treadwear
indicators are showing on a tire.

■

When to replace your vehicle’s

tires

Tires should be replaced if:

●

The treadwear indicators are

showing on a tire.

●

You have tire damage such as

cuts, splits, cracks deep enough

to expose the fabric, and bulges

indicating internal damage

●

A tire goes flat repeatedly or can-

not be properly repaired due to the

size or location of a cut or other

damage

If you are not sure, consult with your

Toyota dealer.

■

Tire life

Any tire over 6 years old must be

checked by a qualified technician

even if it has seldom or never been

used or damage is not obvious.

■

Maximum load of tire

Check that the maximum load of the

replacement tire is greater than 1/2

of the Gross Axle Weight Ratings

(GAWR) of either the front axle or

the rear axle, whichever is greater.
For the GAWR, see the Certification

Label.

For the maximum load of the tire,

see the load limit at maximum cold

tire inflation pressure mentioned on

the sidewall of the tire. (



P.502)

■

Tire types

●

Summer tires

Summer tires are high-speed perfor-

Tires

Replace or rotate tires in
accordance with mainte-
nance schedules and tread-
wear.

Checking tires

417

7-3. Do-it-yourself maintenance

Maintena

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mance tires best suited to highway
driving under dry conditions. Since
summer tires do not have the same
traction performance as snow tires,
summer tires are inadequate for
driving on snow-covered or icy
roads. For driving on snow-covered
roads or icy roads, the use of snow
tires is recommended. When install-
ing snow tires, be sure to replace all
four tires.

●

All season tires

All season tires are designed to pro-
vide better traction in snow and to
be adequate for driving in most win-
ter conditions as well as for use
year-round. All season tires, how-
ever, do not have adequate traction
performance compared with snow
tires in heavy or loose snow. Also,
all season tires fall short in accelera-
tion and handling performance com-
pared with summer tires in highway
driving.

●

Snow tires

For driving on snow-covered roads
or icy roads, we recommend using
snow tires. If you need snow tires,
select tires of the same size, con-
struction and load capacity as the
originally installed tires. Since your
vehicle has radial tires as original
equipment, make sure your snow
tires also have radial construction.
Do not install studded tires without
first checking local regulations for
possible restrictions. Snow tires
should be installed on all wheels.
(



P.327)

■

If the tread on snow tires wears

down below 0.16 in. (4 mm)

The effectiveness of the tires as

snow tires is lost.

WARNING

■

When inspecting or replacing

tires

Observe the following precautions

to prevent accidents.

Failure to do so may cause dam-

age to parts of the drive train as

well as dangerous handling char-

acteristics, which may lead to an

accident resulting in death or seri-

ous injury.

●

Do not mix tires of different

makes, models or tread pat-

terns.

Also, do not mix tires of remark-

ably different treadwear.

●

Do not use tire sizes other than

those recommended by Toyota.

●

Do not mix differently con-

structed tires (radial, bias-belted

or bias-ply tires).

●

Do not mix summer, all season

and snow tires.

●

Do not use tires that have been

used on another vehicle.

Do not use tires if you do not

know how they were used previ-

ously.

NOTICE

■

Driving on rough roads

Take particular care when driving

on roads with loose surfaces or

potholes.

These conditions may cause

losses in tire inflation pressure,

reducing the cushioning ability of

the tires. In addition, driving on

rough roads may cause damage

to the tires themselves, as well as

the vehicle’s wheels and body.

418

7-3. Do-it-yourself maintenance

Rotate the tires in the order
shown.

Front

To equalize tire wear and extend
tire life, Toyota recommends that
tire rotation is carried out at the
same interval as tire inspection.
Do not fail to initialize the tire pres-
sure warning system after tire rota-
tion.

Your vehicle is equipped with a
tire pressure warning system
that uses tire pressure warning
valves and transmitters to detect
low tire inflation pressure before
serious problems arise.



The tire pressure detected by
the tire pressure warning sys-
tem can be displayed on the
multi-information display.
(



P.111)



If the tire pressure drops
below a predetermined level,
the driver is warned by a
screen display and a warning
light. (



P.460)

■

Routine tire inflation pressure

checks

The tire pressure warning system

does not replace routine tire inflation

pressure checks. Make sure to

check tire inflation pressure as part

of your routine of daily vehicle

checks.

■

Tire inflation pressure

●

It may take a few minutes to dis-

play the tire inflation pressure

after the power switch is turned to

ON. It may also take a few min-

utes to display the tire inflation

pressure after inflation pressure

has been adjusted.

●

Tire inflation pressure changes

with temperature. The displayed

values may also be different from

the values measured using a tire

pressure gauge.

Tire rotation

Tire pressure warning
system

419

7-3. Do-it-yourself maintenance

Maintena

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■

Situations in which the tire

pressure warning system may

not operate properly

●

In the following cases, the tire

pressure warning system may not

operate properly.

• If non-genuine Toyota wheels are

used.

• If a tire has been replaced with a

tire that is not an OE (Original

Equipment) tire.

• If a tire has been replaced with a

tire that is not of the specified size.

• If tire chains, etc. are installed.

• If a window tint that affects the

radio wave signals is installed.

• If there is a lot of snow or ice on

the vehicle, particularly around the

wheels or wheel housings.

• If the tire inflation pressure is

much higher than the specified

level.

• If wheels not equipped with tire

pressure warning valves and

transmitter are used.

• If the ID code on the tire pressure

warning valves and transmitters is

not registered in the tire pressure

warning computer.

●

Performance may be affected in

the following situations.

• When driving near a TV tower,

electric power plant, gas station,

radio station, large display, airport

or other facility that generates

strong radio waves or electrical

noise

• When carrying a portable radio,

cellular phone, cordless phone or

other wireless communication

device

If tire position information is not cor-

rectly displayed due to the radio

wave conditions, the display may be

corrected by changing the location

of the vehicle as the radio wave

conditions may change.

●

When the vehicle is stopped, the

time taken for the warning to start

or turn off may be longer.

●

When the inflation pressure of a

tire drops rapidly, for example

when a tire has burst, the warning

may not operate.

■

Warning performance of the tire

pressure warning system

The warning of the tire pressure

warning system will change in

accordance the conditions under

which it was initialized. For this rea-

son, the system may give a warning

even if the tire pressure does not

reach a low enough level, or if the

pressure is higher than the pressure

that was adjusted to when the sys-

tem was initialized.

■

Tire pressure warning system

certification



P.569

When replacing the tires or
wheels, the tire pressure warn-
ing valves and transmitters must
be installed to the wheels which
will be installed to the vehicle.
When new tire pressure warning
valves and transmitters are
installed, new ID codes must be
registered in the tire pressure
warning computer and the tire
pressure warning system must
be initialized. (



P.422)

■

Replacing tires and wheels

If the ID codes of the tire pressure

warning valves and transmitters are

not registered, the tire pressure

warning system will not work prop-

erly. In this case, after driving for

about 10 minutes, the tire pressure

warning light will blink for approxi-

mately 1 minute and then illuminate

to indicate a system malfunction.

Installing tire pressure
warning valves and trans-
mitters

420

7-3. Do-it-yourself maintenance

■

The tire pressure warning
system must be initialized
in the following circum-
stances:



When the tire inflation pres-
sure is changed such as
when changing traveling
speed or load weight.



When the tire inflation pres-
sure is changed such as
when the tire size is changed.



When rotating the tires.



After performing the transmit-
ter ID code registration proce-
dure. (



P.422)

When the tire pressure warning
system is initialized, the current
tire inflation pressure is set as
the benchmark pressure.

■

How to initialize the tire
pressure warning system

Park the vehicle in a safe
place, turn the power switch
off and wait 20 minutes or
more.

Initialization cannot be performed

while the vehicle is moving.

Adjust the tire inflation pres-
sure to the specified cold tire
inflation pressure level.

Make sure to adjust the tire pres-

sure to the specified cold tire infla-

tion pressure level. The tire

pressure warning system will oper-

ate based on this pressure level.

Start the fuel cell system.

Press

of the meter

control switch to select

Press

to select

“Vehicle Settings” and then
press and hold

Press

to select

“TPWS” and then press

Press

to select “Set

Pressure”. Then press and
hold

until the tire pressure

warning light starts blinking.

A message is displayed on the

multi-information display. Also, “--”

is displayed for inflation pressure of

NOTICE

■

Repairing or replacing tires,

wheels, tire pressure warn-

ing valves, transmitters and

tire valve caps

●

When removing or fitting the

wheels, tires or the tire pressure

warning valves and transmit-

ters, contact your Toyota dealer

as the tire pressure warning

valves and transmitters may be

damaged if not handled cor-

rectly.

●

Make sure to install the tire

valve caps. If the tire valve caps

are not installed, water could

enter the tire pressure warning

valves, corrode the valve, and

cause sticking and air leaks.

●

When replacing tire valve caps,

do not use tire valve caps other

than those specified. The cap

may become stuck.

Initializing the tire pres-
sure warning system

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