2022 TOYOTA MIRAI stop start

4227-3. Do-it-yourself maintenance
Owners Manual_USA_M62084_en
■Cleaning the air intake vents
●Dust in the air intake vents may
interfere with the cooling of the
traction battery. If charging/dis-
charging of the traction battery
becomes limited, the distance that
the vehicle can be driven using
the electric motor may be reduced
and the fuel economy may be
reduced. Inspect and clean the air
intake vents periodically.
●Improper handling of the air intake
vent covers and filters may result
in damage to the m. If you have
any concerns about cleaning the
filter, contact you r Toyota dealer.
■If “Maintenance Required for
Traction Battery Cooling Parts
See Owner’s Manual” is shown
on the multi-information display
●If this warning message is shown
on the multi-information display,
remove the air inta ke vent covers
and clean the filters. ( P.453)
●After cleaning the air intake vents,
start the fuel cell system and
check that the warning message
is no longer shown.
It may take approximately 20 min-
utes after the fuel cell system is
started until the warning message
disappears. If the warning message
does not disappear, have the vehi-
cle inspected by your Toyota dealer.
WARNING
■When cleaning the air intake
vents
●Do not use water or other liq-
uids to clean the air intake
vents. If water is applied to the
traction battery or other compo-
nents, a malfunction or fire may
occur.
●Before cleaning the air intake
vents, make su re to turn the
power switch off to stop the fuel
cell system.
■When removing the air intake
vent covers
Do not touch the service plug
located near the air intake vents.
(  P. 7 9 )
NOTICE
■When cleaning the air intake
vents
When cleaning the air intake
vents, make sure to only use a
vacuum to suck out dust and
clogs. If a comp ressed air blow
gun, etc. is used to blow out dust
and clogs, the dust or clogs may
be pushed into the air intake
vents, which may affect the per-
formance of the traction battery
and cause a malfunction.
■To prevent damage to the
vehicle
●Do not allow wa ter or foreign
matter to enter the air intake
vent when the cover is
removed.
●Carefully handle the removed
filter so that i t will not be dam-
aged. If the filter is damaged,
have it replaced with a new filter
by your Toyota dealer.
●Make sure to reinstall the filter
and cover to their original posi-
tions after cleaning.
●Do not install anything to the air
intake vent other than the exclu-
sive filter for this vehicle or use
the vehicle witho ut the filter
installed.

431
Owners Manual_USA_M62084_en
8
8
When trouble arises
When trouble arises
8-1. Essential informationEmergency flashers .... 432
If your vehicle has to be stopped in an emergency.................................. 432
If the vehicle is submerged or water on the road is ris-
ing ............................. 433
8-2. Steps to take in an emer- gency
If your vehicle needs to be towed......................... 435
If you think something is wrong ........................ 439
If a warning light turns on or a warning buzzer sounds
.................................. 441
If a warning message is dis- played........................ 451
If you have a flat tire.... 455
If the fuel cell system will not start ........................... 466
If you lose your keys ... 467
If the fuel door cannot be opened ...................... 468
If the electronic key does not operate properly .. 468
If the 12-volt battery is dis- charged ..................... 471
If your vehicle overheats .................................. 476
If the vehicle becomes stuck .................................. 480

4528-2. Steps to take in an emergency
Owners Manual_USA_M62084_en
■If “FCV System Stopped Steer-
ing Power Low” is displayed
This message is displayed if the fuel
cell system is stopped while driving.
When steering wheel operations are
heavier than usual, grip the steering
wheel firmly and operate it using
more force th an usual.
■If “FCV System High Temp. FCV
Power Reduced” or “FCV
Power Reduced Due to Exces-
sive Acceleration” is displayed
1 Lower the speed while check the
safety, and run the vehicle like
this for several minutes.
2 If the message goes off, the vehi-
cle can be driven as is, since it
temporarily overheated.
This message may be displayed
when driving under severe operat-
ing conditions. (For example, when
driving up a lo ng steep hill.)
■If “FCV Power Significantly
Reduced” is displayed
The output power of the fuel cell
system is greatly restrained. If it is
displayed frequently, contact your
Toyota dealer.
■If “Stop Vehicle in a Safe Place
Push P Switch” is displayed
There may be a malfunction in the
fuel cell system or the shift position
may be shifted to N for a long time.
Immediately stop the vehicle and
contact your Toyota dealer.
■If “Shift is in N Release Acceler-
ator Before Shif ting” is dis-
played
The accelerator pedal has been
depressed when the shift position is
in N.
Release the accelerator pedal and
shift the shift position to D or R.
■If “Press brake when vehicle is
stopped FCV system may over-
heat” is displayed
The message may be displayed
when the accelerator pedal is depressed to hold the vehicle while
the vehicle is stopped on an incline,
etc. The fuel cell system may over-
heat. Release the accelerator pedal
and depress the brake pedal.
■If “Auto Power OFF to Conserve
Battery” is displayed
Power was turned off due to the
automatic power off function. Next
time when starting the fuel cell sys-
tem, operate the fuel cell system for
approximately 5 minutes to
recharge the 12-volt battery.
■If “Headlight System Malfunc-
tion Visit Your Dealer” is dis-
played
The following systems may be mal-
functioning. Hav e the vehicle
inspected by your Toyota dealer
immediately.
●The LED headlight system
●The automatic headlight leveling
system (if equipped)
●AHB (Automatic High Beam)
■If “Radar Cruise Control
Unavailable See Owner’s Man-
ual” is displayed
The dynamic radar cruise control
with full-speed range system is sus-
pended temporarily or until the prob-
lem shown in the message is
resolved. (Causes and coping meth-
ods: P.210)
■If “Radar Cruise Control
Unavailable” is displayed
The dynamic radar cruise control
with full-speed range system cannot
be used temporarily. Use the system
when it becomes available again.
■If a message that indicates the
malfunction of front camera is
displayed
The following systems may be sus-
pended until the problem shown in
the message is resolved. (P.210,
441)
●PCS (Pre-Collision system)

4708-2. Steps to take in an emergency
Owners Manual_USA_M62084_en
1With the P shift position
selected, firmly depress the
brake pedal.
2 Touch the Toyota emblem
side of the electronic key to
the power switch.
When the electronic key is
detected, a buzzer sounds and the
power switch will turn to ON.
When the smart key system is
deactivated in customization set-
ting, the power switch will turn to
ACC.
3Firmly depress the brake
pedal and check that is
shown on the multi-informa-
tion display.
4 Press the power switch.
In the event that the fuel cell
system still cannot be started,
contact your Toyota dealer.
■Stopping the fuel cell system
Set the parking brake, shift the shift
position to P and press the power
switch as you no rmally do when
stopping the fuel cell system.
■Electronic key battery
As the above proce dure is a tempo-
rary measure, it is recommended
that the electronic key battery be
replaced immediatel y when the bat-
tery is depleted. ( P.423)
■Alarm (For Canada)
Using the mechanical key to lock
the doors will not set the alarm sys-
tem. If a door is unlocked using the
mechanical key when the alarm sys-
tem is set, the alarm may be trig-
gered. ( P.70)
■Changing power switch modes
Release the brake pedal and press
the power switch in step 3 above.
The fuel cell system does not start
and modes will be changed each
time the switch is pressed. ( P.176)
Starting the fuel cell sys-
tem

4798-2. Steps to take in an emergency
Owners Manual_USA_M62084_en
8
When trouble arises
able.
6 Start the fuel cell system and
turn the air conditioning sys-
tem on to check that the radi-
ator cooling fan operate and
to check for coolant leaks
from the radiator or hoses.
The fan operate when the air condi-
tioning system is turned on immedi-
ately after a cold s tart. Confirm that
the fan is operating by checking the
fan sound and air flow. If it is diffi-
cult to check these, turn the air con-
ditioning system on and off
repeatedly.
(The fan may not o perate in freez-
ing temperatures.)
7 If the fan is not operating:
Stop the fuel cell system
immediately and contact your
Toyota dealer.
If the fan is operating:
Have the vehicle inspected at
the nearest Toyota dealer.
WARNING
■When inspecting under the
hood of your vehicle
Observe the following precau-
tions.
Failure to do so may result in seri-
ous injury such as burns.
●If steam is seen coming from
under the hood, do not open the
hood until the steam has sub-
sided. The fuel cell unit com-
partment may be very hot.
●Even if fuel cell system has
stopped, the cooling fan may
begin to move suddenly.
Do not touch or approach the
rotating parts of the fan. Doing
so may lead to fingers, clothes
or tools getting caught, resulting
in injury.
●Do not loosen the coolant reser-
voir caps or radia tor cap, while
the fuel cell system and radiator
are hot.
High temperature steam or
coolant could spray out.
NOTICE
■When inverter coolant
Add coolant slowly after the fuel
cell system has cooled down suffi-
ciently. Adding inverter cool cool-
ant to a hot fuel cell system too
quickly can cause damage to the
fuel cell system.
■To prevent damage to the
cooling system
Observe the following precau-
tions:
●Avoid contaminating the coolant
with foreign matter (such as
sand or dust etc.).
●Do not use any coolant additive
with inverter coolant.
●For replacement of the fuel cell
stack coolant, contact your Toy-
ota dealer.
●Do not use water or any other
coolant when refilling the fuel
cell stack coolant. Also, do not
use any additive agents for the
coolant.

4808-2. Steps to take in an emergency
Owners Manual_USA_M62084_en
1Set the parking brake and
stop the fuel cell system.
2 Remove the mud, snow or
sand from around the rear
wheels.
3 Place wood, stones or some
other material under the rear
wheels to help provide trac-
tion.
4 Restart the fuel cell system.
5 Shift the shift position to D or
R and release the parking
brake. Then, while exercising
caution, depress the acceler-
ator pedal.
■When it is difficult to free the
vehicle
Press the switch to turn off
TRAC.
“Traction Control Turned Off”
If the vehicle becomes
stuck
Carry out the following pro-
cedures if the tires spin or
the vehicle becomes stuck
in mud, dirt or snow:
Recovering procedure
WARNING
■When attempting to free a
stuck vehicle
If you choose to push the vehicle
back and forth to free it, make
sure the surrounding area is clear
to avoid striking other vehicles,
objects or people. The vehicle
may also lunge forward or lunge
back suddenly as it becomes free.
Use extreme caution.
■When shifting the shift posi-
tion
Be careful not to shift the shift
position with the accelerator pedal
depressed.
This may lead to unexpected
rapid acceleration of the vehicle
that may cause an accident
resulting in death o r serious injury.
NOTICE
■To avoid damaging the trans-
mission and other compo-
nents
●Avoid spinning the rear wheels
and depressing the accelerator
pedal more than necessary.
●If the vehicle remains stuck
even after these procedures are
performed, the vehicle may
require towing to be freed.

Owners Manual_USA_M62084_en
525What to do if... (Troubleshooting)
vehicle? (P.130)
 Is the steering wheel
unlocked? ( P.173)
 Is the electronic key battery
weak or depleted?
In this case, the fuel cell system
can be started in a temporary way.
( P.470)
 Is the 12-volt battery dis-
charged? ( P.471)
 It is locked automatically to
prevent theft of the vehicle.
( P.173)
 Is the window lock switch
pressed?
The power window except for the
one at the driver’s seat cannot be
operated if the win dow lock switch
is pressed. ( P.158)
 The auto power off function
will be operated if the vehicle
is left in ACC for a period of
time. ( P.176) 
The seat belt reminder light is
flashing
Are the driver and the front passen-
ger wearing the seat belts?
( P.448)
 The parking brake indicator is
on
Is the parking br ake released?
(  P.183)
Depending on the situation,
other types of warning buzzer
may also sound. ( P.441, 451)
 Did anyone inside the vehicle
open a door during setting the
alarm?
The sensor detects it and the alarm
sounds. ( P. 7 0 )
Do one of the following to deac-
tivate or stop the alarms:
 Except for Canada: Unlock
the doors.
 Except for Canada: Unlock
the trunk using the mechani-
cal key.
 For Canada: Unlock the doors
or trunk using the entry func-
tion or wireless remote con-
trol.
The steering wheel can-
not be turned after the
fuel cell system is
stopped
The windows do not open
or close by operating the
power window switches
The power switch is
turned off automatically
A warning buzzer sounds
during driving
An alarm is a ctivated and
the horn sounds

526What to do if... (Troubleshooting)
Owners Manual_USA_M62084_en
 Turn the power switch to ACC
or ON, or start the fuel cell
system. (The alarm will be
deactivated or stopped after a
few seconds.)
 Is the message displayed on
the multi-information display?
Check the message on the multi-
information display. ( P.451)
 When a warning light turns on
or a warning message is dis-
played, refer to P.441, 451.
 Stop the vehicle in a safe
place and repair the flat tire
temporarily with the emer-
gency tire puncture repair kit.
( P.455)
 Try the procedure for when
the vehicle becomes stuck in
mud, dirt, or snow. ( P.480)
A warning buzzer sounds
when leaving the vehicle
A warning light turns on
or a warning message is
displayed
When a problem has
occurred
If you have a flat tire
The vehicle becomes
stuck