check engine TOYOTA 4RUNNER 2021 Owners Manual (in English)

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4RUNNER (U)6-1. Maintenance and care
Cleaning and protecting the vehicle exterior .......... 392
Cleaning and protecting the vehicle interior ........... 395
6-2. Maintenance Maintenance requirements ................... 398
General maintenance ........ 400
Emission inspection and maintenance (I/M)
programs ......................... 403
6-3. Do-it-yourself maintenance
Do-it-yourself service precautions ..................... 404
Hood.................................. 407
Engine compartment ......... 408
Tires .................................. 422
Tire inflation pressure........ 436
Wheels .............................. 439
Air conditioning filter .......... 441
Wireless remote control/ electronic key
battery ............................. 443
Checking and replacing fuses ............................... 446
Light bulbs ......................... 449 7-1. Essential information
Emergency flashers ........... 462
If your vehicle has to be stopped in an
emergency....................... 463
If the vehicle is trapped in rising water ...................... 465
7-2. Steps to take in an emergency
If your vehicle needs to be towed .......................... 466
If you think something is wrong............................... 472
Fuel pump shut off system ............................. 473
If a warning light turns on or a warning buzzer
sounds ............................. 474
If a warning message is displayed ......................... 484
If you have a flat tire .......... 489
If the engine will not start ................................. 504
If you cannot operate back door opener ............ 506
If the electronic key does not operate properly
(vehicles with a smart
key system) ..................... 507
If the vehicle battery is discharged ....................... 510
If your vehicle overheats......................... 514
If the vehicle becomes stuck ................................ 517
6Maintenance and care7When trouble arises

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4RUNNER (U)Please note that this manual applies to all models and explains
all equipment,
including options. Therefore, you may find some explanations fo r equipment
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 impr ovement, 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 color and 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 malfunction.
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.
The installation of a mobile two-way radio system in your vehic le could affect
electronic systems such as:
● Multiport fuel injection system/sequential multiport fuel injection system
● Toyota Safety Sense P
● Cruise control system
● 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.
For your infor mation
Main Owner’s Manual
Noise from under vehicle afte r turning off the engine
Accessories, spare parts and m odification of your Toyota
Installation of a mobile two-way radio system

15Pictorial index
4RUNNER (U)
Tires . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 422
Tire size/inflation pressure . . . . . . . . . . . . . . . . . . . . . . . . . P. 528
Winter tires/tire chain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 329
Checking/rotation/tire pressur e warning system . . . . . . . . .P. 422
Coping with flat tires . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 489
Hood . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 407
Opening . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 407
Engine oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 523
Coping with overheat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 514
Headlights/daytime running lights . . . . . . . . . . . . . . . . . . . . P. 225
Front side marker lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 225
Front turn signal/parking lights . . . . . . . . . . . . . . . . . . . . . . P. 225
Fog lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 234
Turn signal lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 223
Stop/tail lights/rear side marker lights . . . . . . . . . . . . . . . . P. 225
License plate lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 225
Back-up lights
Shifting the shift lever to R . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. 218
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Light bulbs of the exterior lights for driving
(Replacing method: P. 449, Wattages: P. 529)
*: Vehicles with a smart key system
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271-1. For safe use
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For safety and security
4RUNNER (U)
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.

691-1. For safe use
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For safety and security
4RUNNER (U)
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 enter the vehicle and may lead to
an accident caused by light-headedness, or may lead to death or a serious
health hazard.
■ Important points while driving
● Keep the back door closed.
● If you smell exhaust gases in the vehicle even when the back do or is
closed, open the windows and have the vehicle inspected at your Toyota
dealer as soon as possible.
■ 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.

842. Instrument cluster
4RUNNER (U)
*1: These lights turn on when the engine switch is turned to IGNITION ON
mode (vehicles with a smart key system) or the engine switch is turned to
the “ON” position (vehicles without a smart key system) to indi cate that a
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 do not turn off. Have the vehicle inspected by
your Toyota dealer.
*2: This light flashes to indicate a malfunction.
*3: This light flashes rapidly to indicate a malfunction.
*4: This light flashes continuously to indicate a malfunction.
*5: This light illuminates on the multi-information display.
*6: This light flashes or illuminates to indicate a malfunction.
*1, 6PCS warning light
( P. 478)*1Power steering warning
light ( P. 476)
*5
(Amber)
LDA indicator ( P. 478)
*1Master warning light
(P. 484)
Open door warning light
(P. 476)*1Tire pressure warning
light ( P. 478)
Low fuel level warning
light (P. 477)
(if equipped)
Unengaged “Park” warn-
ing light ( P. 476)
Seat belt reminder light
(P. 477)*1
(if equipped)
KDSS warning light
(P. 476)
*5
Low engine oil pressure
warning light ( P. 474)*1, 2
(if equipped)
Automatic running
boards indicator light
(P. 476)

862. Instrument cluster
4RUNNER (U)
*1: These lights turn on when the engine switch is turned to the “ON” position
(vehicles without a smart key system) or the engine switch is turned to
IGNITION ON mode (vehicles with a smart key system) to indicate that a
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 do not turn off. Have the vehicle inspected by
your Toyota dealer.
*2: This light flashes to indicate that the system is operating.
*3: This light does not turn on when the system is disabled.
*4: This light illuminates on the center panel.
*5: This light illuminates on the multi-information display.
*6: This light turns on when the system is off.
*5
(Green)
LDA indicator ( P. 264)
(if equipped)
“A-TRAC” indicator
(P. 300)
*2, 5
(Amber)
LDA indicator ( P. 264)
*1
(if equipped)
“AUTO LSD” indicator
(P. 302)
(if equipped)
Four-wheel drive indica-
tor ( P. 292)*5
(if equipped)
Multi-terrain Select indi-
cator ( P. 313)
*1
(if equipped)
Downhill assist control
system indicator
(P. 307)*5
(if equipped)
Crawl Control indicator
(P. 310)
(if equipped)
Low speed four-wheel
drive indicator
(P. 292, 296)
(if equipped)
Intuitive parking assist
indicator ( P. 285)
(if equipped)
Rear differential lock
indicator ( P. 304)*1, 2
(if equipped)
Automatic running
boards indicator
(P. 128)
(if equipped)
Center differential lock
indicator ( P. 296)

892. Instrument cluster
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Instrument cluster
4RUNNER (U)
Switches between odometer and
trip meter displays. When the trip
meter is displayed, pressing and
holding the button will reset the
trip meter.
The brightness of the instrumen t panel lights can be adjusted.
Brighter
Darker
■ The meters and display illuminate when
Vehicles without a smart key system
The engine switch is in the “ON” position.
Vehicles with a smart key system
The engine switch is in IGNITION ON mode.
■ The brightness of the instrument panel lights
When the headlight switch is turned to on, the brightness will be reduced
slightly unless the control dial is turned fully upward.
Changing the display
Instrument panel light control
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NOTICE
■ To prevent damage to the engine and its components
● Do not let the indicator needle of the tachometer enter the red zone, which
indicates the maximum engine speed.
● The engine may be overheating if the engine coolant temperature gauge is
in the red zone (H). In this case, immediately stop the vehicle in a safe
place, and check the engine after it has cooled completely. ( P. 514)

1243-2. Opening, closing and locking the doors
4RUNNER (U)■
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. Ask your To yota
dealer for details.
● Setting the electronic key to battery- saving mode helps to reduce key bat-
tery depletion. ( P. 121)
■ 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 electronic 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. 507)
● Starting the engine: P. 508
■ Customization
Settings (e. g. operation signal) can be changed.
(Customizable features: P. 545)
■ If the smart key system has been d eactivated in a customized setting
● Locking and unlocking the doors: P. 507
● Starting the engine and changing engine switch modes: P. 508
● Stopping the engine: P. 213

1293-2. Opening, closing and locking the doors
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Operation of each component
4RUNNER (U)
■Jam protection function
During Automatic running boards operation:
If a board contacts an obstacle when extending, it will retract . If an obstacle
gets caught between a board and the vehicle when retracting, th e board will
extend.
If an obstacle is detected 3 times in a row during Automatic ru nning boards
operation, the board will stop at the position it contacts the obstacle. When a
side door on the same side as the board is opened and closed on e more
time, the board will extend and retract, or retract and extend. After this, the
board will resume normal operation.
■ Automatic retraction function
The boards will be automatically retracted, for safety, under t he following con-
ditions:
● A board is not completely retracted
● Vehicle speed is approximately 5 mph (8 km/h) or higher
The boards will not automatically extend again when vehicle spe ed returns to
less than 5 mph (8 km/h).
■ If the Automatic running boards indicator comes on when driving first
commences
A board has not completely retracted. Check that nothing is caught between
the board and the vehicle.
Additionally, if the engine is started immediately after a door has been closed,
the automatic running board may not retract completely and the automatic
running boards indicator may illuminate. In this case, open and close the door
to retract the running board and turn off the indicator.
■ If the Automatic running boards indicator light flashes
There may be a malfunction in the Automatic running boards syst em. Have
the vehicle inspected by your Toyota dealer immediately.
■ When snow or mud is attached to the board or the board is froze n
The Automatic running boards may not operate correctly. Before stepping on
a board, check that it is completely extended. If the Automatic running boards
are not operating correctly, turn the Automatic running boards switch off and
refrain from use.
When removing snow or mud, turn the Automatic running boards sw itch off.
■ After recharging/reconnecting the battery
If the Automatic running boards have not completely extended or retracted,
the boards may not move in the intended direction the first tim e they are oper-
ated. However, from the second time onwards, the boards will re sume normal
operation.
■ When getting in and out of the vehicle
Take care because clothes and shoes may become dirty due to con tact with
the lower part of the vehicle body.