2021 TOYOTA TUNDRA check engine

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6-1. Maintenance and careCleaning and protecting the vehicle exterior .......... 400
Cleaning and protecting the vehicle interior ........... 403
6-2. Maintenance Maintenance requirements ................... 406
General maintenance ........ 408
Emission inspection and maintenance (I/M)
programs ......................... 411
6-3. Do-it-yourself maintenance Do-it-yourself service precautions ..................... 412
Hood.................................. 414
Engine compartment ......... 415
Tires .................................. 426
Tire inflation pressure........ 442
Wheels .............................. 445
Air conditioning filter .......... 448
Wireless remote control/ electronic key battery ...... 451
Checking and replacing fuses ............................... 454
Light bulbs ......................... 457 7-1. Essential information
Emergency 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
6Maintenance and care7When trouble arises

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For your infor mation
Please note that this manual applies to all models and all equipment, includ-
ing options. Therefore, you may find some explanations for equi pment not
installed on your vehicle.
All specifications provided in this manual are current at the t ime of printing.
However, because of the Toyota policy of continual product improvement, we
reserve the right to make changes at any time without notice.
Depending on specifications, the vehicle shown in the illustrat ions may differ
from your vehicle in terms of equipment.
Approximately five hours after the engine is turned off, you ma y hear sound
coming from under the vehicle for several minutes. This is the sound of a fuel
evaporation leakage check and it does not indicate a malfunctio n.
A wide variety of non-genuine spare parts and accessories for T oyota vehi-
cles are currently available in the market. You should know tha t Toyota does
not warrant these products and is not responsible for their per formance,
repair, or replacement, or for any damage they may cause to, or adverse
effect they may have on, your Toyota vehicle.
This vehicle should not be modified with non-genuine Toyota pro ducts. Modi-
fication with non-genuine Toyota products could affect its perf ormance, safety
or durability, and may even violate governmental regulations. In addition,
damage or performance problems resulting from the modification may not be
covered under warranty.
Also, remodeling like this will have an effect on advanced safe ty equipment
such as Toyota Safety Sense P and there is a danger that it wil l not work
properly or the danger that it may work in situations where it should not be
working.
Main Owner’s Manual
Noise from under vehicle afte r turning off the engine
Accessories, spare parts and m odification of your Toyota

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The installation of a mobile two-way radio system in your vehicle could affect
electronic systems such as:
● Multiport fuel injection system/sequential multiport fuel injection system
● Toyota Safety Sense P (if equipped)
● Dynamic radar cruise control system (if equipped)
● Cruise control system (if equipped)
● Anti-lock brake system
● SRS airbag system
● Seat belt pretensioner system
Be sure to check with your Toyota dealer for precautionary meas ures or spe-
cial instructions regarding instal lation of a mobile two-way radio system.
The vehicle is equipped with sophisticated computers that will record certain
data, such as:
• Engine speed / Electric motor speed (traction motor speed)
• Accelerator status
• Brake status
• Vehicle speed
• Operation status of the driving assist systems
• Images from the front camera (available only when certain safe ty sys-
tems are activated, which varies depending on the vehicle specifica-
tions).
The recorded data varies according to the vehicle grade level and options
with which it is equipped.
These computers do not record conversations or sounds, and only record
images outside of the vehicle in certain situations.
●Data Transmission
Your vehicle may transmit the data recorded in these computers to Toyota
without notification to you.
Installation of a mobile two-way radio system
Vehicle data recording

17Pictorial index
Fuel filler door . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 248
Refueling method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 248
Fuel type/fuel tank capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 542
Tires . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 426
Tire size/inflation pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 548
Winter tires/tire chain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 331
Checking/rotation/tire pressure warning system . . . . . . . . . . . P. 426
Coping with flat tires . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 506
Hood . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 414
Opening . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 414
Engine oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 543
Coping with overheat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 529
Camera
*4
Headlights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 234
Fog lights
*3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 244
Front turn signal lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 232
Parking lights/daytime running lights . . . . . . . . . . . . . . . . . P. 234
Rear turn signal lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 232
Tail lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 234
License plate lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 234
Back-up lights
Shifting the shift lever to R . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 225
Side marker lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 234
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Light bulbs of the exter ior lights for driving
(Replacing method: P. 457, Watts: P. 550)
*1: Vehicles with a smart key system
*2: If equipped on CrewMax models
*3: If equipped
*4: Refer to the “NAVIGATION AND MULTIMEDIA
SYSTEM OWNER’S MANUAL”.
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311-1. For safe use
1
For safety and security
WARNING
Observe the following precautions.
Failure to do so may cause the driver’s floor mat to slip, possibly interfering
with the pedals while driving. An unexpectedly high speed may result or it may
become difficult to stop the vehicle. This could lead to an acc ident, resulting in
death or serious injury.
■ When installing the driver’s floor mat
● Do not use floor mats designed for other models or different mo del year
vehicles, even if they are Toyota Genuine floor mats.
● Only use floor mats designed for the driver’s seat.
● Always install the floor mat securely using the retaining hooks (clips) pro-
vided.
● Do not use two or more floor mats on top of each other.
● Do not place the floor mat bottom-side up or upside-down.
■ Before driving
● Check that the floor mat is securely
fixed in the correct place with all the
provided retaining hooks (clips). Be
especially careful to perform this check
after cleaning the floor.
● With the engine stopped and the shift
lever in P, fully depress each pedal to
the floor to make sure it does not inter-
fere with the floor mat.

781-1. For safe use
Exhaust gas precautions
Harmful substance to the human body is included in exhaust
gases if inhale.
WARNING
Exhaust gases include harmful carbon monoxide (CO), which is colorless and
odorless. Observe the following precautions.
Failure to do so may cause exhaust gases to enter the vehicle a nd may lead
to an accident caused by light-headedness, or may lead to death or a serious
health hazard.
■ Important points while driving
● Double Cab and CrewMax models: Keep the back window closed.
● Double Cab and CrewMax models: If you smell exhaust gases in th e vehi-
cle even when the back window is closed, open the windows and h ave the
vehicle inspected at your Toyota dealer as soon as possible.
● Toyota does not recommend occupying the rear cargo area when it is fitted
with a slide-in camper, camper shell or other type cover while the engine is
running. This caution applies to both driving and stopped or pa rked situa-
tions with the engine running. Particular care should be taken to prevent
exhaust gases from entering camper bodies, trailers or other enclosures
on or around your vehicle. If exhaust fumes are detected, open all win-
dows and thoroughly ventilate the area.
■ When parking
● If the vehicle is in a poorly ventilated area or a closed area, such as a
garage, stop the engine.
● Do not leave the vehicle with the engine on for a long time.
If such a situation cannot be avoided, park the vehicle in an o pen space
and ensure that exhaust fumes do not enter the vehicle interior .
● Do not leave the engine running in an area with snow build-up, or where it
is snowing. If snowbanks build up around the vehicle while the engine is
running, exhaust gases may collect and enter the vehicle.
■ Exhaust pipe
The exhaust system needs to be checked periodically. If there is a hole or
crack caused by corrosion, damage to a joint or abnormal exhaust noise, be
sure to have the vehicle inspected and repaired by your Toyota dealer.

1022. Instrument cluster
*1: These lights turn on when the engine switch is turned to ON to indicate thata system check is being performed. They will turn off after the engine is
started, or after a few seconds. There may be a malfunction in a system if
the lights do not come on, or if the lights do not turn off. Ha ve the vehicle
inspected by your Toyota dealer for details.
*2: The light comes on to indicate a malfunction.
*3: The light flashes to indicate a malfunction.
*4: The light illuminates on the multi-information display.
*5: If equipped
The indicators inform the driver of the operating state of the vehicle’s
various systems.
*4
Low windshield washer
fluid warning light
( P. 495)
*4
Brake Override System/
Drive-Start Control warn-
ing light ( P. 496, 499)
*4
Low fuel level warning
light (P. 495)
*4, 5
Automatic High Beam
indicator ( P. 499)
Indicators
Turn signal indicator
(P. 232)*9Automatic High Beam
indicator ( P. 239)
(U.S.A.)
Headlight indicator
(P. 234)*1
(U.S.A.)
Parking brake indicator
(P. 233)
(Canada)
Tail light indicator
(P. 234)*1
(Canada)
Parking brake indicator
(P. 233)
Headlight high beam
indicator ( P. 235)
*6, 9
Cruise control indicator
(P. 289, 294)

1042. Instrument cluster
*1: These lights turn on when the engine switch is turned to ON to indicate thata system check is being performed. They will turn off after the engine is
started, or after a few seconds. There may be a malfunction in a system if
the lights do not come on, or if the lights do not turn off. Ha ve the vehicle
inspected by your Toyota dealer for details.
*2: The light flashes to indicate that the system is operating.
*3: In order to confirm operation, the BSM outside rear view mirro r indicators
illuminate in the following situations:
• When the engine switch is turned to ON, the BSM function is enabled on
the screen of the multi-information display.
• When the BSM function is enabled on the screen of the multi-i nfor-
mation display, the engine switch is turned to ON.
If the system is functioning correctly, the BSM outside rear vi ew mirror indi-
cators will turn off after a few seconds.
If the BSM outside rear view mirror indicators do not illuminat e or do not
turn off, there may be a malfunction with the system.
If this occurs, have the vehicle inspected by your Toyota deale r.
*4: The light illuminates on the outside rear view mirrors.
*5: The light illuminates on the center panel.
*6: The light illuminates on the multi-information display.
*7: When the outside temperature is approximately 37°F (3°C) or lo wer, the
indicator will flash for 10 times, then comes on.
*8: The light comes on when the system is turned off.
*9: If equipped
WARNING
■ If a safety system warning light does not come on
Should a safety system light such as the ABS and SRS warning li ght not
come on when you start the engine, this could mean that these s ystems are
not available to help protect you in an accident, which could r esult in death
or serious injury. Have the vehicle inspected by your Toyota de aler immedi-
ately if this occurs.