2021 TOYOTA TUNDRA engine overheat

2224-2. Driving procedures
■Electronic key battery depletion
P. 124
■ Conditions affecting operation
P. 142
■ Note for the entry function
P. 142
■ If the engine does not start
●The engine immobilizer system may not have been deactivated. ( P. 85)
Contact your Toyota dealer.
● Check that the shift lever is securely set in P. The engine may not start if the
shift lever is displaced out of P. “Shift to P Position” will b e displayed on the
multi-information display.
■ Steering lock
After turning the engine switch off and opening and closing the doors, the
steering wheel will be locked due to the steering lock function . Operating the
engine switch again automatically cancels the steering lock.
■ When the steering lock cannot be released
■ Steering lock motor overheating prevention
To prevent the steering lock motor from overheating, operation of the motor
may be suspended if the engine is turned on and off repeatedly in a short
period of time. In this case, refrain from running the engine. After about
10 seconds, the steering lock motor will resume functioning.
■ When “Smart Entry & Start System Check” is displayed on the multi-
information display
The system may be malfunctioning. Have the vehicle inspected by your
Toyota dealer immediately.
■ If the electronic key battery is depleted
P. 451 A message will be displayed on the multi-
information display.
Check that the shift lever is in P. Press the
engine switch while turning the steering
wheel left and right.

3244-5. Using the driving support systems
■Sounds and vibrations caused by the ABS, brake assist, VSC, TRAC,
Trailer Sway Control and hill-start assist control systems
● A sound may be heard from the engine compartment when the brake pedal
is depressed repeatedly, when the engine is started or just aft er the vehicle
begins to move. This sound does not indicate that a malfunction has
occurred in any of these systems.
● Any of the following conditions may occur when the above system s are
operating. None of these indicates that a malfunction has occur red.
• Vibrations may be felt through the vehicle body and steering.
• A motor sound may be heard also after the vehicle comes to a s top.
• The brake pedal may pulsate slightly after the ABS is activate d.
• The brake pedal may move down slightly after the ABS is activa ted.
■ Automatic reactivation of TRAC, Trailer Sway Control and VSC sy stems
After turning the TRAC, Trailer Sway Control and VSC systems of f, the sys-
tems will be automatically re-enabled in the following situations:
● When the engine 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-enabling will
not occur when vehicle speed increases.
■ If the brake system overheats
TRAC will cease operation, and the slip indicator will change f rom flashing to
being on continuously to alert the driver. Stop the vehicle in a safe place.
(There is no problem with continuing normal driving.)
■ Shifting to “4L”
VSC and Trailer Sway Control are automatically turned off.

3555-1. Using the air conditioning system
5
Interior features
■Seat ventilators
Blows air from the seat Hi
Mid
Lo
Off
The level indicator lights come on.
Pressing the button changes
modes in the following:
HiMid LoOff
■The seat heaters/seat ventilators can be used when
The engine switch is in ON.
■ Passenger seat ventilator timer (vehicles with seat ventilators )
● The ventilator operates on for 5 minutes after the button is pr essed.
● When the passenger is not detected, the automatically turns off the ventila-
tor after 5 minutes.
■ When not in use
Turn the seat heaters or seat ventilators off by pressing the b utton. The indi-
cator light turns off.
1
2
3
4
WARNING
■ Burns
● Use caution when seating the following persons in a seat with t he seat
heater on to avoid the possibility of burns:
• Babies, small children, the elderly, the sick and the physical ly chal-
lenged
• Persons with sensitive skin
• Persons who are fatigued
• Persons who have taken alcohol or drugs that induce sleep (sle eping
drugs, cold remedies, etc.)
● Do not cover the seat with anything when using the seat heater.
Using the seat heater with a blanket or cushion increases the t emperature
of the seat and may lead to overheating.
● Do not use seat heater more than necessary. Doing so may cause minor
burns or overheating.

473
7When trouble arises
7-1. Essential informationEmergency flashers .......... 474
If your vehicle has to be stopped in
an emergency ................. 475
If the vehicle is trapped in rising water .................. 477 7-2. Steps to take in an emergency
If your vehicle needs to be towed ......................... 478
If you think something is wrong .............................. 483
Fuel pump shut off system ............................ 484
If a warning light turns on or a warning buzzer
sounds ............................ 485
If a warning message is displayed......................... 493
If you have a flat tire.......... 506
If the engine will not start ................................. 521
If the electronic key does not operate
properly (vehicles with
a smart key system) ........ 523
If the vehicle battery is discharged ...................... 525
If your vehicle overheats ... 529
If the vehicle becomes stuck ............................... 532

529
7
When trouble arises
7-2. Steps to take in an emergency
If your vehicle overheats
●The needle of the engine coolant temperature gauge ( P. 1 0 5 )
enters the red zone or a loss of engine power is experienced. ( For
example, the vehicle speed does not increase.)
● “ENGINE COOLANT OVERTEMP” is shown on the multi-informa-
tion display.
● Steam comes out f rom under the hood.
Stop the vehicle in a safe place and turn off the air condition ing sys-
tem, and then stop the engine.
If you see steam:
Carefully lift the hood after the steam subsides.
If you do not see steam:
Carefully lift the hood.
After the engine has cooled
down sufficiently, inspect the
hoses and radiator core (radia-
tor) for any leaks. Radiator
Cooling fan
If a large amount of coolant leaks,
immediately contact your Toyota
dealer.
The following may indicate that your vehicle is overheating:
Correction procedures
1
2
3
1
2

600Alphabetical index
Child safety ................................ 58Airbag precautions .................. 44
Battery precautions ............... 527
Child restraint system ............. 59
How your child should wear the seat belt ................. 36
Installing child restraints ......... 63
Moon roof precautions .......... 182
Power back window precautions ......................... 178
Power window lock switch .... 172
Power window precautions ... 174
Rear door child-protector ...... 131
Removed wireless remote control battery
precautions ......................... 453
Seat belt extender precautions ........................... 39
Seat belt precautions .............. 62
Seat heater precautions........ 355
Child-protectors....................... 131
Cleaning ........................... 400, 403 Aluminum wheels.................. 400
Exterior ................................. 400
Interior................................... 403
Seat belts .............................. 404
Clock
*
Compass .................................. 394
Condenser ................................ 420
Console box ............................. 363
Coolant ..................................... 418 Capacity ................................ 545
Checking ............................... 418
Preparing and checking before winter....................... 331
Cooling system ........................ 418 Engine overheating ............... 529
CRS ............................................. 59 Cruise control
Cruise control ....................... 294
Dynamic radar cruise control ...................... 280
Cup holders ............................. 370
Curtain shield airbags............... 41
Customizable features ............ 564
Daytime running light system.................................... 237
Deck hooks .............................. 377
Defogger Back window................. 342, 349
Outside rear view mirrors ........................ 342, 349
Windshield .................... 342, 349
Differential................................ 546
Dimensions .............................. 536
Dinghy towing.......................... 216
Display Drive information .................. 111
Dynamic radar
cruise control ...................... 280
LDA
(Lane Departure Alert) ....... 272
Multi-information display ....... 110
Trip information..................... 110
Warning message................. 493
Do-it-yourself maintenance .... 412
Door lock .................................. 127 Doors .................................... 127
Key ....................................... 127
Smart key system ................. 128
Wireless remote control ........ 128
D

601Alphabetical index
Doors ........................................ 127Automatic door locking and unlocking system ......... 132
Door glasses ......................... 172
Door lock............................... 130
Open door warning message ............................. 494
Outside rear view mirrors...... 167
Rear door child-protector ...... 131
Side doors............................. 127
Driver’s seat position memory .................................. 152
Drive-Start Control .................. 185
Driving ...................................... 184
Break-in tips .......................... 186
Correct driving posture ........... 32
Driving assist system ............ 320
Procedures ........................... 184
Winter drive tips .................... 331
Dynamic radar cruise control ........................ 280 Constant speed
control mode....................... 285
Vehicle-to-vehicle distance control mode ........ 287 EDR (Event data recorder)........ 11
Emergency, in case of
If the engine will not start ...... 521
If the vehicle is trappedin rising water ..................... 477
If the vehicle has discharged battery ................................ 525
If the warning buzzer sounds................................ 485
If the warning light turns
on ....................................... 485
If the warning message is displayed ........................ 493
If you have a flat tire ............. 506
If you lose your keys ............. 123
If you think something is wrong .............................. 483
If your vehicle becomes stuck ................................... 532
If your vehicle has to be stopped in an emergency ... 475
If your vehicle needs
to be towed......................... 478
If your vehicle overheats....... 529
Emergency flashers ................ 474
Engine
“ACC” position ...................... 217
Compartment ........................ 415
Engine switch ....................... 217
Hood ..................................... 414
How to start the engine......... 217
Identification number ............ 541
If the engine will not start ...... 521
Ignition switch (engine switch) ................... 217
Immobilizer system .. ............... 85
Overheating .......................... 529E
*: Refer to “NAVIGATION AND MULTIMEDIA SYSTEM OWNER
’S MANUAL”.

605Alphabetical index
MaintenanceDo-it-yourself maintenance ... 412
General maintenance ........... 408
Maintenance data ................. 536
Maintenance requirements ... 406
Resetting the message indicating maintenance is
required .............................. 407
Malfunction indicator lamp ..... 485
Manual headlight leveling dial .......................................... 236
Map holder ............................... 366
Master warning light........ 486, 493
Meter Indicators .............................. 102
Instrument panel light control................................. 107
Meters ................................... 105
Multi-information display ....... 110
Warning lights ....................... 101
Mirrors Inside rear view mirror .......... 164
Outside rear view
mirror defoggers ......... 342, 349
Outside rear view mirrors...... 167
Vanity mirrors........................ 378
Moon roof ................................. 179 Door lock linked
moon roof operation ........... 180
Jam protection function......... 179
Operation .............................. 179
MP3 disc
*
Multi-information display........ 110 Customizing vehicle features .............................. 564
Drive information .................. 111
Dynamic radar cruise control ...................... 280
LDA
(Lane Departure Alert) ....... 272
Settings................................. 114
Trip information..................... 110
Warning message................. 493
Noise from under vehicle ........... 8
Odometer ......................... 105, 107
Off-road precaution s ............... 335
Oil
Engine oil .............................. 543
Differential oil ........................ 546
Transfer oil............................ 547
Opener Hood ..................................... 414
Outer foot lights
Location ................................ 357
Replacing light bulbs ............ 470
Wattage ................................ 550
Outside rear view mirrors ....... 167 Adjusting and folding ............ 167
Blind spot monitor ................. 305
Mirror position memory ......... 152
Outside rear view mirror defoggers ......... 342, 349
Outside temperature display.................................... 105
Overhead console ................... 369
Overheating ............................. 529M
N
O
*: Refer to “NAVIGATION AND MULTIMEDIA SYSTEM OWNER
’S MANUAL”.