wheel torque TOYOTA SIENNA 2019 Owners Manual (in English)

224
SIENNA_OM_OM08025U_(U)
4-1. Before driving
Dinghy towing
Your vehicle is not designed to be dinghy towed (with 4 wheels
on the ground) behind a motor home.
NOTICE
■To avoid serious damage to your vehicle
■ To prevent causing serious damage to the transaxle and Active T orque
Control 4WD system (AWD models)
Do not tow your vehicle with four wheels
on the ground.
ITN25N009
2WD models: Never tow this vehicle from
the rear with the front wheels on the
ground. This may cause serious damage
to the transaxle.
AWD models: Never tow this vehicle with
any of the wheels on the ground. This
may cause serious damage to the tran-
saxle and Active Torque Control 4WD
system.
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ITN25N011

323
SIENNA_OM_OM08025U_(U)
4-5. Using the driving support systems
4
Driving
Driving assist systems
◆ABS (Anti-lock Brake System)
Helps to prevent wheel lock when the brakes are applied suddenl y,
or if the brakes are applied while driving on a slippery road surface
◆Brake assist
Generates an increased level of braking force after the brake p edal
is depressed when the system de tects a panic stop situation
◆VSC (Vehicle Stability Control)
Helps the driver to control skidding when swerving suddenly or
turning on slippery road surfaces
◆TRAC (Traction Control)
Helps to maintain drive power and prevent the drive wheels from
spinning when starting the vehicle or accelerating on slippery roads
◆Hill-start assist control
Helps to reduce the backward movement of the vehicle when start -
ing on an uphill
◆EPS (Electric Power Steering)
Employs an electric motor to reduce the amount of effort needed to
turn the steering wheel
◆Active Torque Control 4WD (AWD models only)
Automatically switches from front-wheel drive to AWD (All-Wheel
Drive) according to driving conditions, helping to ensure relia ble
handling and stability. Examples of conditions where the system will
switch to AWD are when corneri ng, going uphill, starting off or
accelerating, and when the road surface is slippery due to snow or
rain etc.
To keep driving safety and perf ormance, the following systems
operate automatically in respon se to various driving situations.
Be aware, however, that these systems are supplementary and
should not be relied upon too heav ily when operating the vehi-
cle.

SIENNA_OM_OM08025U_(U)
3274-5. Using the driving support systems
4
Driving
WARNING
■TRAC/VSC may not operate effectively when
Directional control and power may not be achievable while driving on slip-
pery road surfaces, even if the TRAC/VSC system is operating. D rive the
vehicle carefully in conditions where stability and power may b e lost.
■ Hill-start assist control does not operate effectively when
● Do not overly rely on hill-start assist control. Hill-start ass ist control may
not operate effectively on steep inclines and roads covered wit h ice.
● Unlike the parking brake, hill-start assist control is not inte nded to hold the
vehicle stationary for an extended period of time. Do not attempt to use
hill-start assist control to hold the vehicle on an incline, as doing so may
lead to an accident.
■ When the VSC is activated
The slip indicator light flashes. Always drive carefully. Reckless driving may
cause an accident. Exercise particular care when the indicator light flashes.
■ When the TRAC/VSC systems are turned off
Be especially careful and drive at a speed appropriate to the r oad condi-
tions. As these are the systems to help ensure vehicle stabilit y and driving
force, do not turn the TRAC/VSC systems off unless necessary.
■
Replacing tires
Make sure that all tires are of the specified size, brand, trea d pattern
and total load capacity. In addition, make sure that the tires are inflated
to the recommended tire inflation pressure level.
The ABS, TRAC and VSC systems will not function correctly if di fferent
tires are installed on the vehicle.
Contact your Toyota dealer for further information when replaci ng tires
or wheels.
■Handling of tires and the suspension
Using tires with any kind of probl em or modifying the suspension will
affect the driving assist syste ms, and may cause a system to ma lfunc-
tion.
■ Active Torque Control 4WD system (AWD models only)
● The AWD system of this vehicle is intended to ensure driving st ability on
normal roads. It is not designed for use in demanding situation s such as
rally driving.
● Take care when driving on slippery road surfaces.

4687-2. Steps to take in an emergency
SIENNA_OM_OM08025U_(U)
NOTICE
■To prevent damage to the vehicle when towing using a wheel-lift type
truck
When raising the vehicle, ensure adequate ground clearance for towing at
the opposite end of the raised vehicle. Without adequate cleara nce, the
vehicle could be damaged while being towed.
■ To prevent damage to the vehicle when towing with a sling-type truck
Do not tow with a sling-type truck, either from the front or re ar.
■ Recreational towing (behind motor home, etc.)
Never dinghy tow your vehicle to prevent
causing serious damage to the Active
Torque Control 4WD system (AWD mod-
els) and transaxle. ( P. 224)

4927-2. Steps to take in an emergency
SIENNA_OM_OM08025U_(U)
WARNING
■Replacing a flat tire
●Observe the following precautions.
Failure to do so may result in serious injury:
• Do not touch the disc wheels or the area around the brakes imm edi-
ately after the vehicle has been driven.
After the vehicle has been driven the disc wheels and the area
around the brakes will be extreme ly hot. Touching these areas with
hands, feet or other body parts while changing a tire, etc. may result
in burns.
• Remove the spare tire before jacking up the vehicle. If the sp are tire
is removed after jacking up the vehicle, the tire carrier and t he spare
tire may interfere with the jack and cause a serious accident.
●Failure to follow these precautions could cause the wheel nuts to
loosen and the t ire to fall off, resulting in death or serious injury.
• Have the wheel nuts tightened with a torque wrench to 76 ft•lbf (103 N•m, 10.5 kgf•m) as soon as possible after changing wheels.
• When installing a tire, only use wheel nuts that have been spe cifi-
cally designed for that wheel.
• If there are any cracks or defo rmations in the bolt screws, nut
threads or bolt holes of the wheel, have the vehicle inspected by
your Toyota dealer.
• When installing the wheel nuts, b e sure to install them with the
tapered end facing inward. ( P. 433)
●For vehicles with power sliding door and/or power back door: In cases
such as when replacing tires, make sure to turn off the power s liding
door main switch ( P. 124) and/or the power back door main switch
(  P. 136). Failure to do so may cause the sliding door and/or the back
door to operate unintentionally if the power sliding door switc h and/or
the power back door switch is accidentally touched, resulting i n hands
and fingers being caught and injured.

4937-2. Steps to take in an emergency
SIENNA_OM_OM08025U_(U)
7
When trouble arises
Remove any dirt or foreign mat-
ter from the wheel contact sur-
face.
If foreign matter is on the wheel
contact surface, the wheel nuts
may loosen while the vehicle is in
motion, causing the tire to come
off.
Install the tire and loosely
tighten each wheel nut by hand
by approximately the same
amount.
Tighten the wheel nuts until the
tapered portion comes into loose
contact with the disc wheel seat.
Lower the vehicle.
Firmly tighten each wheel nut
two or three times in the order
shown in the illustration.
Tightening torque:
76 ft•lbf (103 N•m, 10.5 kgf•m)
Stow the flat tire, tire jack and all tools.
Installing the spare tire
1
Tapered portion
Disc wheel
seatO
P
Q
R

522
SIENNA_OM_OM08025U_(U)
8-1. Specifications
*1: Minimum pedal clearance when depressed with a force of 110 lbf (490 N,
50 kgf) while the engine is running
*2: Parking brake pedal travel when depressed with a force of 67.4 lbf (300 N,
30.6 kgf)
17-inch tires
Brakes
Pedal clearance*12.99 in. (76 mm)
Pedal free play 0.04  0.24 in. (1  6 mm)
Brake pad wear limit0.04 in. (1.0 mm)
Parking brake lining wear limit 0.04 in. (1.0 mm)
Parking brake pedal travel*23  6 clicks
Fluid type SAE J1703 or FMVSS No.116 DOT 3
Steering
Free play Less than 1.2 in. (30 mm)
Tires and wheels
Tire sizeP235/60R17 100T
Tire inflation pressure
(Recommended cold tire
inflation pressure)Front:
35 psi (240 kPa, 2.4 kgf/cm
2 or bar)
Rear:
35 psi (240 kPa, 2.4 kgf/cm
2 or bar)
Driving at high speeds (above 100
mph [160 km/h]) (in countries where
such speeds are permitted by law)
Add 3 psi (20 kPa, 0.2 kgf/cm
2 or
bar) to the front tires and rear tires.
Never exceed the maximum cold tire
inflation pressure indicated on the
tire sidewall.
Wheel size 17 x 7J
Wheel nut torque76 ft•lbf (103 N•m, 10.5 kgf•m)

SIENNA_OM_OM08025U_(U)
5238-1. Specifications
8
Vehicle specifications
18-inch tires
19-inch tires
Tire size235/55R18 100V, 235/55RF18 100T
Tire inflation pressure
(Recommended cold tire
inflation pressure)Front:
36 psi (250 kPa, 2.5 kgf/cm
2 or bar)
Rear:
36 psi (250 kPa, 2.5 kgf/cm
2 or bar)
Driving at high speeds (above 100
mph [160 km/h]) (in countries where
such speeds are permitted by law)
Add 1 psi (10 kPa, 0.1 kgf/cm
2 or
bar) to the front tires and rear tires.
Never exceed the maximum cold tire
inflation pressure indicated on the
tire sidewall.
Wheel size 18 x 7J
Wheel nut torque76 ft•lbf (103 N•m, 10.5 kgf•m)
Tire size P235/50R19 99V
Tire inflation pressure
(Recommended cold tire
inflation pressure)Front:
36 psi (250 kPa, 2.5 kgf/cm
2 or bar)
Rear:
36 psi (250 kPa, 2.5 kgf/cm
2 or bar)
Driving at high speeds (above 100
mph [160 km/h]) (in countries where
such speeds are permitted by law)
Add 3 psi (20 kPa, 0.2 kgf/cm
2 or
bar) to the front tires and rear tires.
Never exceed the maximum cold tire
inflation pressure indicated on the
tire sidewall.
Wheel size 19 x 7J
Wheel nut torque76 ft•lbf (103 N•m, 10.5 kgf•m)

524
SIENNA_OM_OM08025U_(U)
8-1. Specifications
Compact spare tire (2WD models)
Tire sizeT155/80R17 101M
Tire inflation pressure
(Recommended cold tire
inflation pressure) 60 psi (420 kPa, 4.2 kgf/cm2 or bar)
Wheel size
17 x 4T
Wheel nut torque76 ft•lbf (103 N•m, 10.5 kgf•m)