check engine light TOYOTA TUNDRA 2020 Owners Manual (in English)

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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........ 440
Wheels .............................. 443
Air conditioning filter .......... 446
Wireless remote control/ electronic key battery ...... 449
Checking and replacing fuses ............................... 452
Light bulbs ......................... 455 7-1. Essential information
Emergency flashers ........... 472
If your vehicle has to be stopped in
an emergency.................. 473
If the vehicle is trapped in rising water .................. 475
7-2. Steps to take in an emergency
If your vehicle needs to be towed .......................... 476
If you think something is wrong............................... 481
Fuel pump shut off system ............................. 482
If a warning light turns on or a warning buzzer
sounds ............................. 483
If a warning message is displayed ......................... 491
If you have a flat tire .......... 504
If the engine will not start ................................. 519
If the electronic key does not operate properly
(vehicles with a smart
key system) .................... 521
If the vehicle battery is discharged ....................... 523
If your vehicle overheats.... 527
If the vehicle becomes stuck ................................ 530
6Maintenance and care7When trouble arises

17Pictorial index
Fuel filler door . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 248
Refueling method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 248
Fuel type/fuel tank capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 540
Tires . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 426
Tire size/inflation pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 546
Winter tires/tire chain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 331
Checking/rotation/tire pressure warning system . . . . . . . . . . . P. 426
Coping with flat tires . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 504
Hood . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 414
Opening . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 414
Engine oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 541
Coping with overheat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 527
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. 455, Watts: P. 548)
*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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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. 493)
*4
Brake Override System/
Drive-Start Control warn-
ing light ( P. 494, 497)
*4
Low fuel level warning
light (P. 493)
*4, 5
Automatic High Beam
indicator ( P. 497)
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.

1443-2. Opening, closing and locking the doors
●If there is another electronic key in the detection area, it ma y take slightly
longer to unlock the doors after the door handle is gripped.
● A sudden handle operation or a handle operation immediately aft er entering
the effective range may prevent the doors from being unlocked. Touch the
door unlock sensor and check that the doors are unlocked before pulling the
door handle again.
● Fingernails may scrape against the door during operation of the door han-
dle. Be careful not to injure fingernails or damage the surface of the door.
■ Note for the unlocking function
●Gripping the door handle when wearing a glove may not unlock th e door.
● A sudden approach to the effective range or door handle may prevent the
doors from being unlocked. In this case, return the door handle to the origi-
nal position and check that the doors unlock before pulling the door handle
again.
● If there is another electronic key in the detection area, it ma y take slightly
longer to unlock the doors after the door handle is gripped.
■ When the vehicle is not driven for extended periods
●To prevent theft of the vehicle, do not leave the electronic ke y within 6 ft.
(2 m) of the vehicle.
● The smart key system can be deactivated in advance. ( P. 562)
■ To operate the system properly
●Make sure to carry the electronic key when operating the system. Do not get
the electronic key too close to the vehicle when operating the system from
the outside of the vehicle.
● Depending on the position and holding condition of the electron ic key, the
key may not be detected correctly and the system may not operat e properly.
(The alarm may go off accidentally, or the door lock prevention function may
not operate.)
■ If the smart key system does not operate properly
●Locking and unlocking the doors: Use the mechanical key. ( P. 521)
● Starting the engine: P. 521

1874-1. Before driving
4
Driving
WARNING
Observe the following precautions.
Failure to do so may result in death or serious injury.
■When starting the vehicle
Always keep your foot on the brake pedal while stopped with the engine
running. This prevents the vehicle from creeping.
■ When driving the vehicle
● Do not drive if you are unfamiliar with the location of the brake and accel-
erator pedals to avoid depressing the wrong pedal.
• Accidentally depressing the accelerator pedal instead of the b rake
pedal will result in sudden acceleration that may lead to an accident.
• When backing up, you may twist your body around, leading to di fficulty
in operating the pedals. Make sure to operate the pedals proper ly.
• Make sure to keep a correct driving posture even when moving t he
vehicle only slightly. This allows you to depress the brake and accelera-
tor pedals properly.
• Depress the brake pedal using your right foot. Depressing the brake
pedal using your left foot may delay response in an emergency, result-
ing in an accident.
● Do not drive the vehicle over or stop the vehicle near flammable materials.
The exhaust system and exhaust gases can be extremely hot. Thes e hot
parts may cause a fire if there is any flammable material nearby.
● During normal driving, do not turn off the engine. Turning the engine off
while driving will not cause loss of steering or braking contro l, but the
power assist to these systems will be lost. This will make it m ore difficult to
steer and brake, so you should pull over and stop the vehicle a s soon as it
is safe to do so.
However, in the event of an emergency, such as if it becomes im possible
to stop the vehicle in the normal way: P. 473
● Use engine braking (downshift) to maintain a safe speed when driving
down a steep hill.
Using the brakes continuously may cause the brakes to overheat and lose
effectiveness. ( P. 225)
● Do not adjust the positions of the steering wheel, the seat, or the inside or
outside rear view mirrors while driving.
Doing so may result in a loss of vehicle control.
● Always check that all passengers’ arms, heads or other parts of their body
are not outside the vehicle.

1894-1. Before driving
4
Driving
WARNING
■If you hear a squealing or scrap ing noise (brake pad wear limit indica-
tors)
Have the brake pads checked and replaced by your Toyota dealer as soon
as possible.
Rotor damage may result if the pads are not replaced when neede d.
It is dangerous to drive the vehicle when the wear limits of the brake pads
and/or those of the brake discs are exceeded.
■ When the vehicle is stopped
● Do not race the engine.
If the vehicle is in any gear other than P or N, the vehicle may move sud-
denly and unexpectedly, causing an accident.
● In order to prevent accidents due to the vehicle rolling away, always keep
depressing the brake pedal while the engine is running, and app ly the
parking brake as necessary.
● If the vehicle is stopped on an incline, in order to prevent ac cidents caused
by the vehicle rolling forward or backward, always depress the brake pedal
and securely apply the parking brake as needed.
● Avoid revving or racing the engine.
Running the engine at high speed while the vehicle is stopped m ay cause
the exhaust system to overheat, which could result in a fire if combustible
material is nearby.
■ When the vehicle is parked
● Do not leave glasses, cigarette lighters, spray cans, or soft d rink cans in
the vehicle when it is in the sun.
Doing so may result in the following:
• Gas may leak from a cigarette lighter or spray can, and may le ad to a
fire.
• The temperature inside the vehicle may cause the plastic lenses and plastic material of glasses to deform or crack.
• Soft drink cans may rupture, causing the contents to spray ove r the
interior of the vehicle, and may also cause a short circuit in the vehicle’s
electrical components.
● Do not leave cigarette lighters in the vehicle. If a cigarette lighter is in a
place such as the glove box or on the floor, it may be lit acci dentally when
luggage is loaded or the seat is adjusted, causing a fire.
● Do not attach adhesive discs to the windshield or windows. Do n ot place
containers such as air fresheners on the instrument panel or da shboard.
Adhesive discs or containers may act as lenses, causing a fire in the vehi-
cle.

2184-2. Driving procedures
■When the steering lock cannot be released
■ Key reminder function
A buzzer sounds if the driver’s door is opened while the engine switch is in
ACC or OFF to remind you to remove the key. When starting the engine, the engine
switch may seem stuck in the OFF. To
free it, turn the key while turning the steer-
ing wheel slightly left and right.
WARNING
■ When starting the engine
Always start the engine while sitting in the driver’s seat. Do not depress the
accelerator pedal while starting the engine under any circumsta nces.
Doing so may cause an accident resulting in death or serious in jury.
■ Caution while driving
Do not turn the engine switch to OFF while driving. If, in an e mergency, you
must turn the engine off while the vehicle is moving, turn the engine switch
only to ACC to stop the engine. An accident may result if the e ngine is
stopped while driving. ( P. 473)
NOTICE
■To prevent battery discharge
Do not leave the engine switch in ACC or ON for long periods of time with-
out the engine running.
■ When starting the engine
● Do not crank the engine for more than 30 seconds at a time. This may
overheat the starter and wiring system.
● Do not race a cold engine.
● If the engine becomes difficult to start or stalls frequently, have your vehi-
cle checked by your Toyota dealer immediately.

2244-2. Driving procedures
NOTICE
■To prevent battery discharge
● Do not leave the engine switch in ACC or ON for long periods of time with-
out the engine running.
● If “ACCESSORY” or “IGNITION ON” is displayed on the multi-infor mation
display while the engine is not running, the engine switch is n ot off. Exit the
vehicle after turning the engine switch off.
● Do not stop the engine when the shift lever is in a position ot her than P. If
the engine is stopped in another shift lever position, the engi ne switch will
not be turned off but instead be turned to ACC. If the vehicle is left in ACC,
battery discharge may occur.
■ When starting the engine
● Do not race a cold engine.
● If the engine becomes difficult to start or stalls frequently, have your vehi-
cle checked by your Toyota dealer immediately.
■ Symptoms indicating a malfunction with the engine switch
If the engine switch seems to be operating somewhat differently than usual,
such as the switch sticking slightly, there may be a malfunctio n. Contact
your Toyota dealer immediately.