overheating TOYOTA MIRAI 2018 Owners Manual (in English)

1063. Instrument cluster
MIRAI_OM_USA_OM62025U■
Outside temperature display
●In the following situations, the correct outside temperature ma y not be dis-
played, or the display may take longer than normal to change.
• When stopped, or driving at low speeds (less than 16 mph [25 k m/h])
• When the outside temperature has changed suddenly (at the entr ance/
exit of a garage, tunnel, etc.)
● When “--” or “E” is displayed, the system may be malfunctioning .
Take your vehicle to your Toyota dealer.
■ Liquid crystal display
Small spots or light spots may appear on the display. This phen omenon is
characteristic of liquid crystal displays, and there is no prob lem continuing to
use the display.
■ Customization
The meter display can be customized on the multi-information di splay.
(Customizable features: P. 439)
NOTICE
■To prevent damage to the fuel cell system and its components
This vehicle is equipped with high coolant temperature warning light
(  P. 369), instead of, coolant temperature gauge.
The fuel cell system may be overheating if the high coolant temperature
warning light flashes or comes on. In this case, immediately st op the
vehicle in a safe place, and che ck the fuel cell system after it has cooled
completely.

1865-2. Driving procedures
MIRAI_OM_USA_OM62025U
Parking brake
To set the parking brake, fully
depress the parking brake pedal
with your left foot while depress-
ing the brake pedal with your right
foot.
(Depressing the pedal again
releases the parking brake.)
■Parking the vehicle
P. 158
■ Parking brake engaged warning buzzer
A buzzer will sound if the vehicle is driven with the parking b rake engaged.
“Release Parking Brake” is displayed on the multi-information d isplay.
■ Warning messages and buzzers
Warning messages and buzzers are used to indicate a system malfunction or
to inform the driver of the need for caution. If a warning message is shown on
the multi-information display, read the message and follow the instructions.
■ If the brake system warning light comes on
P. 369
■ Usage in winter time
P. 253
Operating instructions
NOTICE
■When parking the vehicle
Before you leave the vehicle, shift the shift position to P, se t the parking
brake and make sure that the vehicle does not move.
■ Before driving
Fully release the parking brake.
Driving the vehicle with the parking brake set will lead to bra ke components
overheating, which may affect braking performance and increase brake
wear.

2345-5. Using the driving support systems
MIRAI_OM_USA_OM62025U■
Reduced effectiveness of the EPS system
The effectiveness of the EPS system is reduced to prevent the s ystem from
overheating when there is frequent steering input over an exten ded period of
time. The steering wheel may feel heavy as a result. Should thi s occur, refrain
from excessive steering input or stop the vehicle and turn the fuel cell system
off. The EPS system should return to normal within 10 minutes.
■ Automatic reactivation of TRAC and VSC systems
After turning the TRAC and VSC systems off, the systems will be automati-
cally re-enabled in the following situations:
● When the power switch is turned off
● If only the TRAC system is turned off, the TRAC will turn on wh en vehicle
speed increases
If both the TRAC and VSC systems are turned off, automatic re-e nabling will
not occur when vehicle speed increases
■ Operating conditions of hill-start assist control
When the following four conditions are met, the hill-start assi st control will
operate:
● The shift position is in a position other than P or N (when sta rting off forward/
backward on an upward incline).
● The vehicle is stopped.
● The accelerator pedal is not depressed.
● The parking brake is not engaged.
■ Automatic system cancelation of hill-start assist control
The hill-start assist control will turn off in any of the follo wing situations:
● Shift the shift position to P or N.
● The accelerator pedal is depressed.
● The parking brake is engaged.
● Approximately 2 seconds elapse after the brake pedal is release d.
■ Operating conditions of emergency brake signal
When the following three conditions are met, the emergency brak e signal will
operate:
● The emergency flashers are off.
● Actual vehicle speed is over 35 mph (55 km/h).
● The brake pedal is depressed in a manner that cause the system to judge
from the vehicle deceleration that this is a sudden braking ope ration.
■ Automatic system cancelation of emergency brake signal
The emergency brake signal will turn off in any of the followin g situations:
● The emergency flashers are turned on.
● The brake pedal is released.
● The system judges from the vehicle deceleration that is not a s udden brak-
ing operation.

4068-2. Steps to take in an emergency
MIRAI_OM_USA_OM62025U
If your vehicle overheats
The following may indicate that your vehicle is overheating.
● The high coolant temperature warning light ( P. 369) comes on
or flashes, or a loss of fuel ce ll system power is experienced. (For
example, the vehicle s peed does not increase.)
● “FC System Overheat Output Power is Limited” ( P. 376) is dis-
played on the multi-in formation display
● Steam comes out from under the hood.
Label
Fuel cell stack coolant
reservoir Inverter coolant reservoir

451Alphabetical index
MIRAI_OM_USA_OM62025U
Child-protectors....................... 123
Cleaning ........................... 306, 310Aluminum wheels.................. 307
Exterior ................................. 306
Interior................................... 310
Seat belts .............................. 311
Clock ......................................... 278
Coat hooks ............................... 279
Condenser ................................ 325
Console box ............................. 271
Coolant Capacity ................................ 419
Checking ............................... 324
Preparing and checking Warning light ...................... 369
Cooling system ........................ 324 Fuel cell system
overheating......................... 406
Cruise control Dynamic radar cruise
control................................. 203
Cup holders.............................. 272
Curtain shield airbags ............... 37
Customizable features ............ 434
Daytime running light system .................................... 188
Defogger Outside rear view mirrors...... 259
Rear window ......................... 259
Windshield ............................ 259
Dimensions .............................. 416
Dinghy towing .......................... 171 Display
Drive information .................. 108
Dynamic radar cruise
control ................................ 203
Energy monitor ..................... 108
LDA
(Lane Departure Alert) ....... 216
Multi-information display ....... 107
Warning message ................ 376
Do-it-yourself maintenance .... 318
Door courtesy lights Location ................................ 267
Wattage ................................ 421
Door lock
Doors .................................... 120
Key ....................................... 398
Smart key system ................. 120
Wireless remote control ........ 120
Doors Automatic door locking
and unlocking systems ....... 123
Door glasses......................... 154
Door lock .............................. 122
Door windows ....................... 154
Open door warning buzzer ... 124
Open door warning light ....... 371
Outside rear view mirrors ..... 151
Rear door child-protector ...... 123
Drive information..................... 108
Driver’s seat belt reminder light ........................................ 371
Driver’s seat position memory .................................. 140
D
*: Refer to the “NAVIGATION SYSTEM OWNER’S MANUAL”.

454Alphabetical index
MIRAI_OM_USA_OM62025U
Opening the fuel door ........... 198
Overheating .......................... 406
Power output restriction .......... 88
Power switch......................... 172
Precautions ............................. 82
Regenerative braking.............. 81
Road accident cautions .......... 92
Running out of fuel.................. 85
Service plugs .......................... 91
Sounds and vibrations ............ 80
Starting the system............... 172
Traction battery air intake vent....................................... 85
Vehicle proximity notification
system ......... ......................... 84
Warning message ................. 376
Water release ....................... 173
Fuel consumption............ 111, 112
Fuel door .................................. 198 Refueling............................... 198
Fuses ........................................ 355
Garage door opener ................ 292
Gauges ..................................... 102
Glove box ................................. 271
Grocery bag hooks .................. 275 H
2O switch ............................... 173
Hands-free system
(for cellular phone)
*
Head restraints ........................ 145
Headlights ................................ 187 Automatic High Beam system .......... ...................... 190
Light switch ........................... 187
Replacing light bulbs ............ 358
Heated steering wheel ............ 265
Heaters Automatic air conditioning system .......... ...................... 256
Heated steering wheel .......... 265
Outside rear view mirrors ..... 259
Seat heaters ......................... 266
High mounted stoplight
Replacing light bulbs ............ 358
High-voltage components ........ 83
Hill-start assist control ........... 231
Hood ......................................... 320 Warning message................. 376
Hooks
Coat hooks ........................... 279
Grocery bag hooks ............... 275
Retaining hooks (floor mat) .... 26
Horn .......................................... 147
Hydrogen detectors .................. 87
Hydrogen-related components............................. 82
Hydrogen tanks ......................... 86 Capacity................................ 418
Location ............................ 78, 82
G
H

457Alphabetical index
MIRAI_OM_USA_OM62025U
Navigation system*
Odometer.................................. 102
OpenerFuel door............................... 200
Hood ..................................... 320
Trunk..................................... 126
Outside rear view mirrors ....... 151 Adjusting and folding ............ 151
BSM (Blind spot monitor) ...... 244
Outside rear view mirror defoggers ........................... 259
Outside temperature
display .................................... 102
Overhead console ................... 274
Overheating.............................. 406 P position switch ..................... 180
Parking brake........................... 186
Operation .............................. 186
Parking brake engaged warning buzzer/message ... 186
Warning light......................... 371
Parking lights........................... 187 Light switch ........................... 187
Replacing light bulbs ............ 358
PCS (Pre-Collision System).......... 237
Function ................................ 237
PCS switch ........................... 238
Warning light......................... 370
Warning message................. 376
Personal lights......................... 268 Switch ................................... 268
Wattage ................................ 421
Power control unit ..................... 83
Power easy access system .... 140
Power outlet ............................. 281
Power steering (Electric power steering) ...... 232
Warning light......................... 370
Power switch ........................... 172
Power windows ....................... 154 Jam protection function ........ 155
Operation .............................. 154
Window lock switch .............. 154
Pre-Collision System
(PCS) ...................................... 237 Function ................................ 237
PCS switch ........................... 238
Warning light......................... 370
Warning message................. 376
N
O
P
*: Refer to the “NAVIGATION SYSTEM OWNER’S MANUAL”.