Scion iQ. Service Manual - part 20

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6-1. Specifications

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■

If your engine knocks

●

You may occasionally notice light knocking for a short time while acceler-
ating or driving uphill. This is normal and there is no need for concern.

●

Consult your Scion dealer.

NOTICE

■

Notice on fuel quality

●

Do not use improper fuels. If improper fuels are used the engine will be
damaged.

●

Do not use leaded gasoline. 
Leaded gasoline can cause damage to your vehicle’s three-way catalytic
converters causing the emission control system to malfunction.

●

Do not use gasohol other than the type previously stated. 
Other gasohol may cause fuel system damage or vehicle performance
problems.

●

Using unleaded gasoline with an octane number or rating lower than the
level previously stated will cause persistent heavy knocking. 
At worst, this will lead to engine damage.

■

Fuel-related poor driveability

If poor driveability is encountered after using a different type of fuel (poor hot
starting, vaporization, engine knocking, etc.), discontinue the use of that type
of fuel.

■

When refueling with gasohol

Take care not to spill gasohol. Otherwise, it can damage your vehicle’s paint.

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6-1. Specifications

Tire information

Typical tire symbols

Tire size

(

P. 334)

DOT and Tire Identification Number (TIN)

(

P. 333)

Location of treadwear indicators

(

P. 222)

Tire ply composition and materials

Plies are layers of rubber-coated parallel cords. Cords are the
strands which form the plies in a tire.

Uniform tire quality grading

For details, see “Uniform Tire Quality Grading” that follows.

Load limit at maximum cold tire inflation pressure

(

P. 337)

Maximum cold tire inflation pressure

(

P. 337)

This means the pressure to which a tire may be inflated.

TUBELESS or TUBE TYPE

A tubeless tire does not have a tube and air is directly put into the
tire. A tube type tire has a tube inside the tire and the tube main-
tains the air pressure.

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6-1. Specifications

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Typical DOT and Tire Identification Number (TIN)

DOT symbol

*

Tire Identification Number
(TIN)

Tire manufacturer’s identifica-
tion mark

Tire size code

Manufacturer’s optional tire
type code (3 or 4 letters)

Manufacturing week

Manufacturing year

*

:The DOT symbol certifies that

the tire conforms to applicable
Federal Motor Vehicle Safety
Standards.

Radial tires or bias-ply tires

A radial tire has RADIAL on the sidewall. A tire not marked RADIAL
is a bias-ply tire.

Summer tires or all season tires

(

P. 225)

An all season tire has M+S on the sidewall. A tire not marked M+S
is a summer tire.

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6-1. Specifications

Tire size

■

Typical tire size information

The illustration indicates typical tire size.

Tire use
(P = Passenger car, 
T = Temporary use)

Section width (millimeters)

Aspect ratio 
(tire height to section width)

Tire construction code 
(R = Radial, D = Diagonal)

Wheel diameter (inches)

Load index (2 digits or 3 digits)

Speed symbol 
(alphabet with one letter)

■

Tire dimensions

Section width

Tire height

Wheel diameter

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6-1. Specifications

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Tire section names

Bead

Sidewall

Shoulder

Tread

Belt

Inner liner

Reinforcing rubber

Carcass

Rim lines

Bead wires

Chafer

Uniform Tire Quality Grading

This information has been prepared in accordance with regulations
issued by the National Highway Traffic Safety Administration of the
U.S. Department of Transportation. 
It provides the purchasers and/or prospective purchasers of Scion
vehicles with information on uniform tire quality grading.

Your Scion dealer will help answer any questions you may have as
you read this information.

■

DOT quality grades

All passenger vehicle tires must conform to Federal Safety
Requirements in addition to these grades. Quality grades can be
found where applicable on the tire sidewall between tread shoulder
and maximum section width.

For example: Treadwear 200 Traction AA Temperature A

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6-1. Specifications

■

Treadwear

The treadwear grade is a comparative rating based on the wear
rate of the tire when tested under controlled conditions on a speci-
fied government test course.

For example, a tire graded 150 would wear one and a half (1 - 1/2)
times as well on the government course as a tire graded 100. 
The relative performance of tires depends upon the actual conditions
of their use. Performance may differ significantly from the norm due
to variations in driving habits, service practices and differences in
road characteristics and climate.

■

Traction AA, A, B, C

The traction grades, from highest to lowest, are AA, A, B and C,
and they represent the tire’s ability to stop on wet pavement as
measured under controlled conditions on specified government
test surfaces of asphalt and concrete.

A tire marked C may have poor traction performance.

Warning: The traction grade assigned to this tire is based on braking
(straight ahead) traction tests and does not include cornering (turn-
ing) traction.

■

Temperature A, B, C

The temperature grades are A (the highest), B, and C, represent-
ing the tire’s resistance to the generation of heat and its ability to
dissipate heat when tested under controlled conditions on a speci-
fied indoor laboratory test wheel.

Sustained high temperature can cause the material of the tire to
degenerate and reduce tire life, and excessive temperature can lead
to sudden tire failure.

Grade C corresponds to a level of performance which all passenger
car tires must meet under the Federal Motor Vehicle Safety Standard
No. 109.

Grades B and A represent higher levels of performance on the labo-
ratory test wheel than the minimum required by law.

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Warning: The temperature grades of a tire assume that it is properly
inflated and not overloaded. 
Excessive speed, underinflation, or excessive loading, either sepa-
rately or in combination, can cause heat buildup and possible tire fail-
ure.

Glossary of tire terminology

Tire related term

Meaning

Cold tire inflation pres-
sure

Tire pressure when the vehicle has been 
parked for three hours or more, or has not 
been driven more than 1 mile or 1.5 km under 
that condition

Maximum inflation 
pressure

The maximum cold inflated pressure to which a 
tire may be inflated, shown on the sidewall of 
the tire

Recommended infla-
tion pressure

Cold tire inflation pressure recommended by a 
manufacturer

Accessory weight

The combined weight (in excess of those stan-
dard items which may be replaced) of trans-
mission, power steering, power brakes, power 
windows, power seats, radio and heater, to the 
extent that these items are available as factory-
installed equipment (whether installed or not)

Curb weight

The weight of a motor vehicle with standard 
equipment, including the maximum capacity of 
fuel, oil and coolant, and if so equipped, air 
conditioning and additional weight optional 
engine

Maximum loaded vehi-
cle weight

The sum of: 
(a) Curb weight 
(b) Accessory weight 
(c) Vehicle capacity weight 
(d) Production options weight

Normal occupant 
weight

150 lb. (68 kg) times the number of occupants 
specified in the second column of Table 1

*

 that 

follows

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6-1. Specifications

Tire related term

Meaning

Occupant distribution

Distribution of occupants in a vehicle as speci-
fied in the third column of Table 1

*

 below

Production options 
weight

The combined weight of installed regular pro-
duction options weighing over 5 lb. (2.3 kg) in 
excess of the standard items which they 
replace, not previously considered in curb 
weight or accessory weight, including heavy 
duty brakes, ride levelers, roof rack, heavy duty 
battery, and special trim

Rim

A metal support for a tire or a tire and tube 
assembly upon which the tire beads are seated

Rim diameter
(Wheel diameter)

Nominal diameter of the bead seat

Rim size designation

Rim diameter and width

Rim type designation

The industry manufacturer’s designation for a 
rim by style or code

Rim width

Nominal distance between rim flanges

Vehicle capacity 
weight (Total load 
capacity)

The rated cargo and luggage load plus 150 lb. 
(68 kg) times the vehicle’s designated seating 
capacity

Vehicle maximum load 
on the tire

The load on an individual tire that is determined 
by distributing to each axle its share of the 
maximum loaded vehicle weight, and dividing 
by two

Vehicle normal load 
on the tire

The load on an individual tire that is determined 
by distributing to each axle its share of curb 
weight, accessory weight, and normal occu-
pant weight (distributed in accordance with 
Table 1

*

 below), and dividing by two

Weather side

The surface area of the rim not covered by the 
inflated tire

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Tire related term

Meaning

Bead

The part of the tire that is made of steel wires, 
wrapped or reinforced by ply cords and that is 
shaped to fit the rim

Bead separation

A breakdown of the bond between components 
in the bead

Bias ply tire

A pneumatic tire in which the ply cords that 
extend to the beads are laid at alternate angles 
substantially less than 90 degrees to the cen-
terline of the tread

Carcass

The tire structure, except tread and sidewall 
rubber which, when inflated, bears the load

Chunking

The breaking away of pieces of the tread or 
sidewall

Cord

The strands forming the plies in the tire

Cord separation

The parting of cords from adjacent rubber com-
pounds

Cracking

Any parting within the tread, sidewall, or inner-
liner of the tire extending to cord material

CT

A pneumatic tire with an inverted flange tire 
and rim system in which the rim is designed 
with rim flanges pointed radially inward and the 
tire is designed to fit on the underside of the 
rim in a manner that encloses the rim flanges 
inside the air cavity of the tire

Extra load tire

A tire designed to operate at higher loads and 
at higher inflation pressures than the corre-
sponding standard tire

Groove

The space between two adjacent tread ribs

Innerliner

The layer(s) forming the inside surface of a 
tubeless tire that contains the inflating medium 
within the tire

Innerliner separation

The parting of the innerliner from cord material 
in the carcass

340

6-1. Specifications

Tire related term

Meaning

Intended outboard 
sidewall

(a)The sidewall that contains a whitewall, bears 

white lettering, or bears manufacturer, 
brand, and/or model name molding that is 
higher or deeper than the same molding on 
the other sidewall of the tire, or

(b)The outward facing sidewall of an asymmet-

rical tire that has a particular side that must 
always face outward when mounted on a 
vehicle

Light truck (LT) tire

A tire designated by its manufacturer as prima-
rily intended for use on lightweight trucks or 
multipurpose passenger vehicles

Load rating

The maximum load that a tire is rated to carry 
for a given inflation pressure

Maximum load rating

The load rating for a tire at the maximum per-
missible inflation pressure for that tire

Maximum permissible 
inflation pressure

The maximum cold inflation pressure to which 
a tire may be inflated

Measuring rim

The rim on which a tire is fitted for physical 
dimension requirements

Open splice

Any parting at any junction of tread, sidewall, or 
innerliner that extends to cord material

Outer diameter

The overall diameter of an inflated new tire

Overall width

The linear distance between the exteriors of 
the sidewalls of an inflated tire, including eleva-
tions due to labeling, decorations, or protective 
bands or ribs

Passenger car tire

A tire intended for use on passenger cars, mul-
tipurpose passenger vehicles, and trucks, that 
have a gross vehicle weight rating (GVWR) of 
10,000 lb. or less

Ply

A layer of rubber-coated parallel cords

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Tire related term

Meaning

Ply separation

A parting of rubber compound between adja-
cent plies

Pneumatic tire

A mechanical device made of rubber, chemi-
cals, fabric and steel or other materials, that, 
when mounted on an automotive wheel, pro-
vides the traction and contains the gas or fluid 
that sustains the load

Radial ply tire

A pneumatic tire in which the ply cords that 
extend to the beads are laid at substantially 90 
degrees to the centerline of the tread

Reinforced tire

A tire designed to operate at higher loads and 
at higher inflation pressures than the corre-
sponding standard tire

Section width

The linear distance between the exteriors of 
the sidewalls of an inflated tire, excluding ele-
vations due to labeling, decoration, or protec-
tive bands

Sidewall

That portion of a tire between the tread and 
bead

Sidewall separation

The parting of the rubber compound from the 
cord material in the sidewall

Snow tire

A tire that attains a traction index equal to or 
greater than 110, compared to the ASTM E-
1136 Standard Reference Test Tire, when 
using the snow traction test as described in 
ASTM F-1805-00, Standard Test Method for 
Single Wheel Driving Traction in a Straight Line 
on Snow-and Ice-Covered Surfaces, and which 
is marked with an Alpine Symbol (

) on at 

least one sidewall

Test rim

The rim on which a tire is fitted for testing, and 
may be any rim listed as appropriate for use 
with that tire

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6-1. Specifications

*

:Table 1 

 Occupant loading and distribution for vehicle normal load

for various designated seating capacities

Tire related term

Meaning

Tread

That portion of a tire that comes into contact 
with the road

Tread rib

A tread section running circumferentially 
around a tire

Tread separation

Pulling away of the tread from the tire carcass

Treadwear indicators 
(TWI)

The projections within the principal grooves 
designed to give a visual indication of the 
degrees of wear of the tread

Wheel-holding fixture

The fixture used to hold the wheel and tire 
assembly securely during testing

Designated seating 

capacity, Number of 

occupants 

Vehicle normal load, 

Number of occupants

Occupant distribution 

in a normally loaded 

vehicle

2 through 4

2

2 in front

5 through 10

3

2 in front, 1 in second 

seat

11 through 15

5

2 in front, 1 in second 
seat, 1 in third seat, 1 

in fourth seat

16 through 20

7

2 in front, 2 in second 
seat, 2 in third seat, 1 

in fourth seat

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6-2. Customization

Customizable features

Item

Function

Default setting

Customized 

setting

Wireless 
remote 
control 
(

P. 26)

Wireless remote control

ON

OFF

Unlocking operation

Driver’s door 
unlocked in 
one step, all 
doors 
unlocked in 
two steps

All doors 
unlocked in 
one step

Automatic door lock 
function to be activated 
if door is not opened 
after being unlocked

ON

OFF

Time elapsed before 
automatic door lock 
function is activated if 
door is not opened after 
being unlocked

60 seconds

30 seconds

120 seconds

Operation signal 
(Emergency flashers)

ON

OFF

Panic function

ON

OFF

Door lock 
(

P. 30)

Unlocking using a key

Driver’s door 
unlocked in 
one step, all 
doors 
unlocked in 
two steps

All doors 
unlocked in 
one step

Your vehicle includes a variety of electronic features that can be per-

sonalized to suit your preferences. Programming these preferences

requires specialized equipment and may be performed by your Scion

dealer.

Some function settings are changed simultaneously with other functions
being customized. Contact your Scion dealer for further details.

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6-2. Customization

Automatic 
light off 
system 
(

P. 132)

Light sensor sensitivity

Level 3

Level 1 to 5

Time elapsed before 
headlights automati-
cally turn off after doors 
are closed

30 seconds

0 seconds

60 seconds

90 seconds

Illumination 
(

P. 169)

Time elapsed before 
lights turn off

15 seconds

7.5 seconds

30 seconds

Operation after the 
engine switch is turned 
to the LOCK position

ON

OFF

Operation when the 
doors are unlocked

ON

OFF

Seat Belt 
Reminder 
Buzzer 
(

P. 280)

Vehicle speed linked 
seat belt reminder 
buzzer

ON

OFF

Item

Function

Default setting

Customized 

setting

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Items to initialize

Item

When to initialize

Reference

Maintenance required 
remainder light

After the maintenance is per-
formed

P. 190

Tire pressure warning 
system

• When rotating the tires on vehi-

cles with differing front and rear 
tire inflation pressures

• When changing the tire size

P. 223

The following items must be initialized for normal system operation

after such cases as the battery being reconnected, or maintenance

being performed on the vehicle.

348

Reporting safety defects for U.S. owners

If you believe that your vehicle has a defect which could cause a
crash or could cause injury or death, you should immediately
inform the National Highway Traffic Safety Administration (NHTSA)
in addition to notifying Scion, a marque of Toyota Motor Sales,
U.S.A., Inc. (Toll-free: 1-866-707-2466).

If NHTSA receives similar complaints, it may open an investigation,
and if it finds that a safety defect exists in a group of vehicles, it
may order a recall and remedy campaign. However, NHTSA can-
not become involved in individual problems between you, your
dealer, or Scion, a marque of Toyota Motor Sales, U.S.A., Inc.

To contact NHTSA, you may call the Vehicle Safety Hotline toll-free
at 1-888-327-4236 (TTY: 1-800-424-9153); go to http://www.safer-
car.gov; or write to: Administrator, NHTSA, 1200 New Jersey Ave,
S.E., Washington, DC 20590. You can also obtain other informa-
tion about motor vehicle safety from http://www.safercar.gov.