Scion iM. Service Manual - part 19

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8-1. Specifications

Scion iM_U (12J49U)

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Recommendation of the use of low emissions gasoline
Gasolines containing oxygenates such as ethers and ethanol, as well as
reformulated gasolines, are available in some cities. These fuels are typically
acceptable for use, providing they meet other fuel requirements.

Scion recommends these fuels, since the formulations allow for reduced vehi-
cle emissions.

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Non-recommendation of the use of blended gasoline

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If you use gasohol in your vehicle, be sure that it has an octane rating no
lower than 87.

l

Scion does not recommend the use of gasoline containing methanol.

l

Use only gasoline containing up to 15%
ethanol.
DO NOT use any flex-fuel or gasoline
that could contain more than 15% etha-
nol, including from any pump labeled
E30, E50, E85 (which are only some
examples of fuel containing more than
15% ethanol).

DO NOT use gasoline contain-
ing more than 15% ethanol.

(30% ethanol)

(50% ethanol)

(85% ethanol)

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8-1. Specifications

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Non-recommendation of the use of gasoline containing MMT
Some gasoline contains an octane enhancing additive called MMT (Methylcy-
clopentadienyl Manganese Tricarbonyl).

Scion does not recommend the use of gasoline that contains MMT. If fuel
containing MMT is used, your emission control system may be adversely
affected.

The malfunction indicator lamp on the instrument cluster may come on. If this
happens, contact your Scion dealer for service.

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If your engine knocks

l

Consult your Scion dealer.

l

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

NOTICE

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Notice on fuel quality

l

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

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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.

l

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

l

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.

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

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When refueling with gasohol
Take care not to spill gasohol. It can damage your vehicle’s paint.

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8-1. Specifications

Scion iM_U (12J49U)



Full-size tire



Compact spare tire

Tire information

Typical tire symbols

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8-1. Specifications

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Tire size (

P. 309)

DOT and Tire Identification Number (TIN)(

P. 308)

Uniform tire quality grading

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

Location of treadwear indicators(

P. 220)

Tire ply composition and materials

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

Radial tires or bias-ply tires

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

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 maintains the air
pressure.

Load limit at maximum cold tire inflation pressure (

P. 313)

Maximum cold tire inflation pressure (

P. 313)

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

Summer tires or all season tires (

P. 224)

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

“TEMPORARY USE ONLY”

A compact spare tire is identified by the phrase “TEMPORARY USE
ONLY” molded on its sidewall. This tire is designed for temporary
emergency use only.

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5

6

7

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9

10

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8-1. Specifications

Scion iM_U (12J49U)

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.

Typical DOT and Tire Identification Number (TIN)

1
2
3

4
5

6
7

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8-1. Specifications

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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)

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Tire dimensions

Section width

Tire height

Wheel diameter

Tire size

1

2
3

4

5
6

7

1
2
3

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8-1. Specifications

Scion iM_U (12J49U)

Bead

Sidewall

Shoulder

Tread

Belt

Inner liner

Reinforcing rubber

Carcass

Rim lines

Bead wires

Chafer

Tire section names

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2
3
4
5
6
7
8
9

10

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8-1. Specifications

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Scion iM_U (12J49U)

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.

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DOT quality grades

All passenger vehicle tires must conform to Federal Safety Require-
ments 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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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 condi-
tions 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.

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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.

Uniform Tire Quality Grading

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8-1. Specifications

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Temperature A, B, C

The temperature grades are A (the highest), B, and C, representing
the tire’s resistance to the generation of heat and its ability to dissi-
pate heat when tested under controlled conditions on a specified
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 Stan-
dard No. 109.

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

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
failure.

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8-1. Specifications

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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 auto-
matic transmission, 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

Occupant distribution

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

*

 below

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8-1. Specifications

Scion iM_U (12J49U)

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 deter-
mined 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 deter-
mined by distributing to each axle its share of
curb weight, accessory weight, and normal
occupant 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

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 compo-
nents in the bead

Tire related term

Meaning

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8-1. Specifications

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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 centerline 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
compounds

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

Intended outboard
sidewall

(a) The sidewall that contains a whitewall,

bears white lettering, or bears manufac-
turer, 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 asym-

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

Tire related term

Meaning

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8-1. Specifications

Scion iM_U (12J49U)

Light truck (LT) tire

A tire designated by its manufacturer as pri-
marily 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 ele-
vations due to labeling, decorations, or protec-
tive bands or ribs

Passenger car tire

A tire intended for use on passenger cars,
multipurpose 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

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

Tire related term

Meaning

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*

: Table 1 

 Occupant loading and distribution for vehicle normal load for

various designated seating capacities

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

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

Tire related term

Meaning

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8-1. Specifications

Scion iM_U (12J49U)

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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8-2. Customization

P. 78

Some function settings are changed simultaneously with other func-
tions when customized. Contact your Scion dealer for further details.

Settings that can be changed using the meter control switches

Settings that can be changed by your Scion dealer

Definition of symbols: O = Available, —=Not available

Customizable features

Your vehicle includes a variety of electronic features that can be
personalized to suit your preferences. The settings of these fea-
tures can be changed using the meter control switches or at
your Scion dealer.

Customizing vehicle features using the meter control switches

Customizable features

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