2023 TOYOTA 4RUNNER ECU

1764-1. Before driving
4RUNNER (U)
Cargo and luggage
Take notice of the following information about storage precau-
tions, cargo capacity and load:● Stow cargo and luggage in the luggage compartment whenever
possible.
● Be sure all items are secured in place.
● To maintain vehicle balance while driving, position luggage evenly
within the luggage compartment.
● For better fuel economy, do no t carry unnecessary weight.

1794-1. Before driving
4
Driving
4RUNNER (U)
■When using the roof rails (if equipped)
●To use the roof rails as a roof luggage
carrier, you must fit the roof rails with
two or more genuine Toyota cross rails
or their equivalent.
●When there is no luggage on the roof
luggage carrier Toyota recommends
that the front and rear cross rails be
secured in the positions indicated in
the illustration. This may reduce wind
noise while driving.
WARNING
■Things that must not be carried in the luggage compartment
The following things may cause a fire if loaded in the luggage compart-
ment:
●Receptacles containing gasoline
●Aerosol cans
■Storage precautions
Observe the following precautions.
Failure to do so may prevent the pedals from being depressed pr operly,
may block the driver’s vision, or may result in items hitting t he driver or
passengers, possibly causing an accident.
●Stow cargo and luggage in the luggage compartment whenever poss i-
ble.
●Do not stack cargo and luggage in the luggage compartment highe r
than the seatbacks.
●Do not place cargo or luggage in or on the following locations.
• At the feet of the driver
• On the front passenger or rea r seats (when stacking items)
• On the instrument panel
• On the dashboard
●Secure all items in the occupant compartment.
●When you fold down the rear seats, long items should not be pla ced
directly behind the front seats.
●Never allow anyone to ride in the luggage compartment. It is no t
designed for passengers. They should ride in their seats with their seat
belts properly fastened. Otherwise, they are much more likely t o suffer
death or serious bodily injury, in the event of sudden braking, sudden
swerving or an accident.
Roof rails
Cross rails

1804-1. Before driving
4RUNNER (U)
WARNING
■Capacity and distribution
●Do not exceed the maximum axle weight rating or the total vehicle
weight rating.
●Even if the total load of occupant’s weight and the cargo load is less
than the total load capacity, do not apply the load unevenly. I mproper
loading may cause deterioration of steering or braking control which
may cause death or serious injury.
■When loading cargo on the roof luggage carrier
Observe the following precautions:
●Place the cargo so that its weight is distributed evenly betwee n the
front and rear axles.
●If loading long or wide cargo, never exceed the vehicle overall length
or width. (
P. 5 2 4)
●Before driving, make sure the cargo is securely fastened on the roof
luggage carrier.
●Loading cargo on the roof luggage carrier will make the center of grav-
ity of the vehicle higher. Avoid high speeds, sudden starts, sharp turns,
sudden braking or abrupt maneuvers, otherwise it may result in loss of
control or vehicle rollover due to failure to operate this vehi cle correctly
and result in death or serious injury.
●If driving for a long distance, on rough roads, or at high spee ds, stop
the vehicle now and then during the trip to make sure the cross rails
are fixed securely and that the cargo remains in its place.
●Do not exceed 120 lb. (54 kg) cargo weight on the roof luggage carrier.
NOTICE
■When loading cargo on the roof luggage carrier
Be careful not to scratch the surface of the moon roof (if equipped).

1944-1. Before driving
4RUNNER (U)■
Before towing
Check that the following conditions are met:
●Ensure that your vehicle’s tires are properly inflated. ( P. 532)
● Trailer tires are inflated according to the trailer manufacture r’s recommen-
dation.
● All trailer lights work as required by law.
● All lights work each time you connect them.
● The trailer ball is set at the proper height for the coupler on the trailer.
● The trailer is level when it is hitched.
Do not drive if the trailer is not level, and check for imprope r tongue weight,
overloading, worn suspension, or other possible causes.
● The trailer cargo is securely loaded.
● The rear view mirrors conform to all applicable federal, state/provincial or
local regulations. If they do not, install rear view mirrors ap propriate for tow-
ing purposes.
■ When towing a trailer
Disable the following systems, as the systems may not operate p roperly.
● LDA (Lane Departure Alert) ( P. 249)
● Dynamic radar cruise control ( P. 257)
● BSM (Blind Spot Monitor) ( P. 270)
● Intuitive parking assist ( P. 277)
● RCTA (Rear Cross Traffic Alert) function (P. 286)
■ Break-in schedule
If your vehicle is new or equipped with any new power train com ponents
(such as an engine, transmission, differential or wheel bearing ), Toyota rec-
ommends that you do not tow a trailer until the vehicle has bee n driven for
over 500 miles (800 km).
After the vehicle has been driven for over 500 miles (800 km), you can start
towing. However, for the next 500 miles (800 km), drive the veh icle at a speed
of less than 45 mph (72 km/h) when towing a trailer, and avoid full throttle
acceleration.
■ Maintenance
●If you tow a trailer, your vehicle will require more frequent m aintenance due
to the additional load. (See “Scheduled Maintenance Guide” or “ Owner’s
Manual Supplement”.)
● Retighten the fixing bolts of the towing ball and bracket after approximately
600 miles (1000 km) of trailer towing.

1974-1. Before driving
4
Driving
4RUNNER (U)
WARNING
■Hitch
Trailer hitch assemblies have different weight capacities estab lished by the
hitch manufacturer. Even though the vehicle may be physically capable of
towing a higher weight, the operator must determine the maximum weight
rating of the particular hitch assembly and never exceed the maximum
weight rating specified for the trailer-hitch. Exceeding the maximum weight
rating set by the trailer-hitch manufacturer can cause an accid ent resulting
in death or serious personal injuries.
■ When towing a trailer
Toyota recommends trailers with brakes that conform to any applicable fed-
eral and state/provincial regulations.
● If the gross trailer weight exceeds unbraked TWR, trailer brakes are
required. Toyota recommends trailers with brakes that conform t o all appli-
cable federal and state/provincial regulations.
● Never tap into your vehicle’s hydraulic system, as this will lo wer the vehi-
cle’s braking effectiveness.
● Never tow a trailer without using a safety chain securely attac hed to both
the trailer and the vehicle. If damage occurs to the coupling u nit or hitch
ball, there is danger of the trailer wandering into another lan e.
NOTICE
■When installing a trailer hitch
Use only the position recommended by your Toyota dealer. Do not install
the trailer hitch on the bumper; this may cause body damage.
■ Do not directly splice trailer lights
Do not directly splice trailer lights. Directly splicing traile r lights may damage
your vehicle’s electrical system and cause a malfunction.

2024-2. Driving procedures
4RUNNER (U)■
If the engine does not start
●The engine immobilizer system may not have been deactivated. ( P. 78)
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.
■ When a message requesting the smart key system be inspected is dis-
played 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. 447
■ Operation of the engine switch
If the switch is not pressed shortly and firmly, the engine swi tch mode may
not change or the engine may not start.

2214-3. Operating the lights and wipers
4
Driving
4RUNNER (U)
Ty p e A
Turns the front fog lights
off
Turns the front fog lights
on
Fog light switch
The fog lights secure excellent visibility in difficult driving con-
ditions, such as in rain and fog.
1
2

2304-4. Refueling
4RUNNER (U)
WARNING
■When refueling the vehicle
Observe the following precautions while refueling the vehicle. Failure to do
so may result in death or serious injury.
● After exiting the vehicle and before opening the fuel door, touch an
unpainted metal surface to discharge any static electricity. It is important to
discharge static electricity before refueling because sparks resulting from
static electricity can cause fuel vapors to ignite while refueling.
● Always hold the grips on the fuel tank cap and turn it slowly t o remove it.
A whooshing sound may be heard when the fuel tank cap is loosened.
Wait until the sound cannot be heard before fully removing the cap. In hot
weather, pressurized fuel may spray out the filler neck and cau se injury.
● Do not allow anyone that has not discharged static electricity from their
body to come close to an open fuel tank.
● Do not inhale vaporized fuel.
Fuel contains substances that are harmful if inhaled.
● Do not smoke while refueling the vehicle.
Doing so may cause the fuel to ignite and cause a fire.
● Do not return to the vehicle or touch any person or object that is statically
charged.
This may cause static electricity to build up, resulting in a p ossible ignition
hazard.
■ When refueling
Observe the following precautions to prevent fuel overflowing from the fuel
tank:
● Securely insert the fuel nozzle into the fuel filler neck.
● Stop filling the tank after the fuel nozzle automatically click s off.
● Do not top off the fuel tank.
NOTICE
■Refueling
Do not spill fuel during refueling.
Doing so may damage the vehicle, such as causing the emission c ontrol
system to operate abnormally or damaging fuel system components or the
vehicle’s painted surface.