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Keep this in mind when checking tire inflation
pressure where the temperature is different from the
outside temperature.
For example:
If inside temperature is 68 °F (20 °C) and the outside
temperature is 32 °F (0 °C) then the cold tire inflation
pressure should be increased by 3 psi (0.2 bar), which
equals 1.5 psi (0.1 bar) for every 18 °F (10 °C) for this
outside temperature condition.
Check tire pressures more often if subject to a wide
range of outdoor temperatures, as tire pressures vary
with temperature changes.Checking Tire Inflation Pressure
The tire inflation pressure should be checked
regularly, i.e. at least each time you refuel the vehicle.
The preferred interval for checking the tire inflation
pressure, however, is before each trip.
Inflation pressures specified on the Tire and Loading
Information placard on the driver’s door B-pillar are
always cold tire inflation pressures. Check and adjust
the tire inflation pressure when the tires are cold. Cold
tire inflation pressure is defined as the tire pressure
after the vehicle has been parked for at least 3 hours or
driven less than 1 mile (1.6 km) at an ambient
temperature of approximately 68 °F (20 °C).
The cold tire inflation pressure must not exceed the
maximum tire inflation pressure molded into the tire
side wall, refer to "Tire Labeling".
If you check the tire inflation pressure when the tires
are warm (the vehicle has been driven for several miles
or sitting less than 3 hours), the reading will be higher
than the cold reading. This is normal. Do not let air out
to match the specified cold tire inflation pressure.
Otherwise, the tire will be underinflated.
WARNING!
Tire pressure may increase during operation.
Never reduce this normal pressure build up or
your tire pressure will be too low.
Underinflated tires wear excessively and/or
unevenly, adversely affect handling and fuel
economy, and are more likely to fail from being
overheated.
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5
Follow the steps below to achieve correct tire inflation
pressure:
Remove the cap from the valve on one tire. Firmly press a tire gauge onto the valve.
Read tire inflation pressure on tire gauge and check
against the recommended tire inflation pressure on
the Tire and Loading Information placard on the
driver’s door B-pillar. If necessary, add air to
achieve the recommended tire inflation pressure.
NOTE: If you have overfilled the tire, release tire
inflation pressure by pushing the metal stem of the
valve with e.g. a tip of a pen. Then recheck the tire
inflation pressure with the tire gauge.
Install the valve cap.
Repeat this procedure for each tire.
WARNING!
Follow recommended tire inflation pressures.
Do not underinflate tires. Underinflated tires
wear excessively and/or unevenly, adversely
affect handling and fuel economy, and are more
likely to fail from being overheated.
Do not overinflate tires. Overinflated tires can
adversely affect handling and ride comfort, wear
unevenly, increase stopping distance, and result
in sudden deflation (blowout) because they are
more likely to become punctured or damaged by
road debris, potholes etc.
Do not overload the tires by exceeding the
specified load limit as indicated on the Tire and
Loading Information placard on the driver’s door
B-pillar. Overloading the tires can overheat them,
possibly causing a blowout.
WARNING!
After inspecting or adjusting the tire inflation
pressure always reinstall the valve cap if
equipped.
This will prevent moisture and dirt from entering
the valve stem, which could damage the valve
stem.
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Potential Problems associated with Underinflated
and Overinflated Tires
Proper tire inflation pressure is essential to the safe and
satisfactory operation of your vehicle. Three primary
areas are affected by improper tire inflation pressure:
1. Safety
WARNING!
Improperly inflated tires are dangerous and can
cause accidents.
Underinflation increases tire flexing and can
result in tire failure.
Overinflation reduces a tire’s ability to
cushionshock. Objects on the road and chuck
holes can cause damage that results in tire
failure.
Unequal tire inflation pressures can cause
steering problems.You could lose control of
your vehicle.
Overinflated or underinflated tires can
affectvehicle handling and can fail suddenly,
resulting in loss of vehicle control.
Unequal tire pressures from one side of the
vehicle to the other can cause the vehicle to drift
to the right or left. Always drive with each tire
inflated to the recommended cold tire inflation
pressure.
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2. Economy
Improper inflation pressures can cause uneven wear
patterns to develop across the tire tread. These
abnormal wear patterns will reduce tread life resulting
in a need for earlier tire replacement. Underinflation
also increases tire rolling resistance and results in
higher fuel consumption.
3. Ride Comfort and Vehicle Stability
Proper tire inflation contributes to a comfortable ride.
Overinflation produces a jarring and uncomfortable
ride.Tire Labeling
Besides tire name (sales designation) and
manufacturer name, a number of markings can be
found on a tire.
NOTE: Data shown on tire are for illustration purposes
only. Actual data on tires are specific to each vehicle
and may vary from data shown in the illustration.
(1) DOT, Tire Identification Number (TIN)
(2) Maximum tire load
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(3) Maximum tire inflation pressure
(4) Manufacturer
(5) Tireplymaterial
(6) Tire size designation, load and speed rating
(7) Tire name
Tire Size Designation, Load and Speed Rating
(1) Design standard
(2) Tire width
(3) Aspect ratio in %
(4) Radial tire code
(5) Rim diameter
(6) Tire load rating
(7) Tire speed rating
NOTE: Data shown on tires are for illustration
purposes only. Actual data on tires are specific to each
vehicle and may vary from data shown in the
illustration.
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Maximum Tire Inflation Pressure
(1) Maximum permissible tire inflation pressure
NOTE: Data shown on tire are for illustration purposes
only. Actual data on tires are specific to each vehicle
and may vary from data shown in the illustration.
This is the maximum permissible tire inflation
pressure for the tire.Always follow the recommended tire inflation
pressure for proper tire inflation, refer to
"Recommended Tire Inflation Pressure".
WARNING!
Never exceed the max. tire inflation pressure.
Follow recommended tire inflation pressures.
Do not underinflate tires. Underinflated tires
wear excessively and/or unevenly, adversely
affect handling and fuel economy, and are more
likely to fail from being overheated.
Do not overinflate tires. Overinflated tires can
adversely affect handling and ride comfort, wear
unevenly, increase stopping distance, and result
in sudden deflation (blowout) because they are
more likely to become punctured or damaged by
road debris, potholes etc.
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Bead
The tire bead contains steel wires wrapped by steel
cords that hold the tire onto the rim.
Cold Tire Inflation Pressure
Tire inflation pressure when your vehicle has been
sitting for at least 3 hours or d r i v e n n o m o r e t h a n 1 m i l e
(1.6 km).
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 optional equipment, but without
passengers and cargo.
DOT (Department of Transportation)
A tire branding symbol which denotes the tire meets
requirements of the U.S. Department of
Transportation.
GAWR (Gross Axle Weight Rating)
The GAWR is the maximum permissible axle weight.
The gross vehicle weight on each axle must never
exceed the GAWR for the front and rear axle indicatedon the Certification Label located below the driver’s
seat on an outward facing position of the mounting
pillar.
GTW (Gross Trailer Weight)
The GTW is the weight of the trailer plus the weight of
all cargo, equipment, luggage etc. loaded on the trailer.
GVW (Gross Vehicle Weight)
The GVW comprises the weight of the vehicle
including fuel, tools, spare wheel, installed accessories,
passengers and cargo and, if applicable, trailer tongue
load. The GWV must never exceed the GWVR
indicated on the Certification Label located below the
driver’s seat on an outward facing position of the
mounting pillar.
GVWR (Gross Vehicle Weight Rating)
This is themaximum permissible vehicle weight of the
fully loaded vehicle (weight of the vehicle including all
options, passengers, fuel, and cargo and, if applicable,
trailer tongue load). It is indicated on the Certification
Label located below the driver’s seat on an outward
facing position of the mounting pillar.
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Kilopascal (kPa)
Themetric unit for air pressure. There are 6.9 kPa to 1
psi; another metric unit for air pressure is bars. There
are 100 kilopascals (kPa) to 1 bar.
Maximum Load Rating
The maximum load in kilograms and pounds that can
be carried by the tire.
Maximum Loaded Vehicle Weight
The sum of curb weight, accessory weight, vehicle
capacity weight and production options weight.
Maximum Tire Inflation Pressure
This number is the greatest amount of air pressure that
should ever be put in the tire under normal driving
conditions.
Normal Occupant Weight
The number of occupants the vehicle is designed to
seat, multiplied by 68 kilograms (150 lbs).
Occupant Distribution
The distribution of occupants in a vehicle at their
designated seating positions.Production Options Weight
The combined weight of those installed regular
production options weighing over 5 lbs (2.3 kilograms)
in excess of those 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.
PSI (Pounds per Square Inch)
A standard unit of measure for air pressure. Another
metric unit for air pressure is bars or kilopascal (kPa).
Recommended Tire Inflation Pressure
Recommended tire inflation pressure listed on Tire
and Loading Information placard on the driver’s door
B-pillar for normal driving conditions. Provides best
handling, tread life and riding comfort.
Rim
A metal support for a tire or a tire and tube assembly
upon which the tire beads are seated.
Sidewall
The portion of a tire between the tread and the bead.