Tire pressure
Tire pressure specifications
Important safety notes G
WARNING
Underinflated or overinflated tires pose the
following risks:
R the tires may burst, especially as the load
and vehicle speed increase.
R the tires may wear excessively and/or
unevenly, which may greatly impai rtire
traction.
R the driving characteristics, as well as
steering and braking, may be greatly
impaired.
There is a risk of an accident.
Follow recommended tire inflation pressures
and chec kthe pressure of all the tires
including the spare wheel:
R monthly, at least
R if the load changes
R before beginning a long journey
R under different operating conditions, e.g.
off-road driving
If necessary, correct the tire pressure.
i The specifications shown on the sample
Tire and Loading Information placard and
tire pressure table are examples. Tire
pressure data are vehicle-specific and may
deviate from the data illustrated here. The
tire pressure data applicable to your
vehicle can be found on the Tire &Loading
Information placard or tire pressure plate
of your vehicle. H
Environmental note
Check the tire pressure regularly, at least
every 14 days. General notes You will find information on tire pressure for
the vehicle's factory-mounted tires on the
plates described here.
You will find a table of recommended tire
pressures on the Tire and Loading
Information placard
5
or on the tire pressure
table on the B-pillar on the driver's side of the
vehicle.
Further information on tire pressure can be
obtained at a qualified specialist workshop.
Tire and Loading Information placard Tire and Loading Information placard
561011
The Tire and Loading Information placard is
on the B-pillar on the driver's side of the
vehicle (Y page 286).
The Tire and Loading Information placard
contains recommended tire pressures 0005for
cold tires. Recommended tire pressures 0005
are valid for the maximum permissible load
and up to the maximum permissible speed of
the vehicle.
5 Only for vehicles with a gross vehicle weight of less than 10,000 lbs(4,536 kg).
6 Only for vehicles with a gross weight of less than 10,000 lbs(4,536 kg).
10 Only for vehicles with a gross vehicle weight of less than 10,000 lbs(4,536 kg).
11 Only for vehicles with a gross weight of less than 10,000 lbs(4,536 kg). 278
Tire pressureWheels and tires
Tire pressure plate
Tire pressure plate
The tire pressure table is located on the
B-pillar on the driver's side of the vehicle
(Y page 286).
The tire pressure table contains
recommended tire pressures 0005for cold
tires. Recommended tire pressures 0005apply
to the maximum permissible load and up to
the maximum permissible speed of the
vehicle. Important notes on tire pressure
G
WARNING
If the tire pressure drops repeatedly, the
wheel, valve or tire ma ybe damaged. Tire
pressure that is too low may result in a tire
blow-out. There is a risk of an accident.
R Check the tire for foreign objects.
R Check whether the wheel is losing air or the
valve is leaking.
If you are unable to rectify the damage,
contact a qualified specialist workshop.
Use a suitable pressure gauge to chec kthe
tire pressure. The outer appearance of a tire
does not permit any reliable conclusion about
the tire pressure. On vehicles equipped with
the electronic tire pressure monitor, the tire
pressure can be checked using the on-board
computer. The tire temperature and pressure increase
when the vehicle is in motion. This is
dependent on the driving speed and the load.
Therefore, you should only correct tire
pressure when the tires are cold.
The tires are cold:
R
if the vehicle has been parked for at least
three hours without direct sunlight on the
tires, and
R if the vehicle has not been driven further
than 1 mile (1.6 km)
Tire temperature changes depending on the
ambient temperature, driving speed and tire
load. If the tire temperature changes by
18 ‡(10 †), the tire pressure changes by
approximately 10 kPa (0. 1bar/1. 5psi). Take
this into account when checking the pressure
of warm tires. Only correct the tire pressure
if it is too low for the current operating
conditions. If you check the tire pressure
when the tires are warm, it results in a higher
value than when the tires are cold. This is
normal. Do not under any circumstances
release the air in order to adjust the pressure
to the prescribed value for cold tires. The tire
pressure would otherwise be too low.
Observe the recommended tire pressures for
cold tires:
R on the Tire and Loading Information
placard 6
on the B-pillar on the driver's side
or
R on the tire pressure table on the B-pillar on
the driver's side of the vehicle Underinflated or overinflated tires
Underinflated tires: G
WARNING
Tires with pressure that is too low can
overheat and burst as a consequence. In
addition, they also suffer from excessive and/
or irregularw ear, which can severely impair
6 Only for vehicles with a gross weight of less than 10,00 0lbs(4,536 kg). Tire pressure
279Wheels and tires
Z
the braking properties and the driving
characteristics .There is a risk of an accident.
Avoid tire pressures that are too low in all the
tires, including the spare wheel.
Underinflated tires can:
R fail from being overheated
R adversely affect handling
R wear excessively and/or unevenly
R have an adverse effect on fuel consumption
Overinflated tires G
WARNING
Tires with excessively high pressure can burst
because they are damaged more easily by
road debris, potholes etc. In addition, they
also suffer from irregular wear, which can
severely impair the braking properties and the
driving characteristics. There is a risk of an
accident.
Avoid tire pressures that are too high in all the
tires, including the spare wheel.
Overinflated tires can:
R increase the braking distance
R adversely affect handling
R wear excessively and/or unevenly
R adversely affect ride comfort
R be more susceptible to damage
Maximum tire pressures 0005
Maximum permitted tire pressure
(example) Never exceed the maximum permissible tire
inflation pressure. When adjusting the tire
pressures always observe the recommended
tire pressure for your vehicle (Y
page 278).
i The actual values for tires are specific to
each vehicle and may deviate from the
values in the illustration. Tire valve (snap-in valve)
G
WARNING
Tire valve that are not approved for your
vehicle by the distributor named on the inside
cover page may result in a loss of tire
pressure. This may affect road safety. There
is a risk of an accident.
Only use tire valve that are approved for your
vehicle by the distributor named on the inside
cover page. Always make sure you have the
correct tire valve type for the tires on your
vehicle.
! Do not screw additional weights (check
valves, etc.) onto the tire valves. The
electronic components could thus be
damaged.
Only for vehicles without atire pressure
monitor:
For safety reasons, we recommend that you
only use tire valves that have been tested for
use on your vehicle, e.g. those manufactured
by Wonder:
R type TR 600 for the vehicle types 2500
R type TR 418 for the vehicle types 3500 Checking the tire pressure manually
In order to determine and adjust the tire
pressures, proceed as follows:
X Remove the valve cap of the tire you wish
to check.
X Press the tire pressure gauge securely onto
the valve. 280
Tire pressureWheels and tires
X
Read the tire pressure and compare it with
the recommended value on the loading
information table or th etire pressure table
(Y page 278).
X If the tire pressure is too low, increase it to
the recommended value.
X If the tire pressure is too high, release air
by pressing down the metal pin in the valve.
Use the tip of a pen, for example. Then,
chec kthe tire pressure again using the tire
pressure gauge.
X Screw the valve cap onto the valve.
X Repeatt he steps for the other tires. Tire pressure monitor
Important safety notes G
WARNING
Each tire, including the spare (if provided),
should be checked at least once a month
when cold and inflated to the pressure
recommended by the vehicle manufacturer
on the Tire and Loading Information placard
on the driver's door B-pillar or the tire
pressure label on the inside of the fuel filler
flap. If your vehicle has tires of a different size
than the size indicated on the Tire and Loading
Information placard or the tire pressure label,
you should determine the proper tire pressure
for those tires.
As an added safety feature, your vehicle has
been equipped with a tire pressure monitoring
system (TPMS) that illuminates a low tire
pressure telltale when one or more of your
tires are significantly underinflated.
Accordingly, when the low tire pressure
telltale illuminates, you should stop and check
your tires as soon as possible, and inflate
them to the proper pressure. Driving on a
significantly underinflated tire causes the tire
to overheat and can lead to tire failure.
Underinflation also reduces fuel efficiency
and tire tread life, and may affect the vehicle's
handling and stopping ability. Please note that the TPMS is not a substitute
for proper tire maintenance, and it is the
driver's responsibility to maintain correct tire
pressure, even if underinflation has not
reached the level to trigger illumination of the
TPMS low tire pressure telltale.
USA only:
Your vehicle has also been equipped with a
TPMS malfunction indicator to indicate if the
system is not operating properly. The TPMS
malfunction indicator is combined with the
low tire pressure telltale. When the system
detects a malfunction, the warning lamp will
flash for approximately a minute and then
remain continuously illuminated. This
sequence will be repeated every time the
vehicle is started as long as the malfunction
exists.
When the malfunction indicator is illuminated,
the system may not be able to detect or signal
low tire pressure as intended. TPMS
malfunctions may occur for a variety of
reasons, including the installation of
incompatible replacement or alternate tires
or wheels on the vehicle that prevent the
TPMS from functioning properly. Always
check the TPMS malfunction telltale after
replacing one or more tires or wheels on your
vehicle to ensure that the replacement or
alternate tires and wheels allow the TPMS to
continue to function properly.
Vehicles with a tire pressure monitor are
equipped with sensors in the wheels that
monitor the tire pressure of all four tires. The
tire pressure monitor monitors the pressure
in all four tires; you set this pressure when
you activate the tire pressure monitor. The
tire pressure monitor warns you when the
pressure drops in one or more of the tires. The
tire pressure monitor only functions if the
corresponding sensors are installed to all
wheels.
You should always adjust the tire pressure
according to the vehicle load. Restart the tire
pressure monitor if you change the tire
pressure. Tire pressure
281Wheels and tires Z
The tire pressure monitor does not warn you
if a tire pressure is incorrect. Observe the
notes on the recommended tire pressure
(Y page 278).
The tire pressure monitor is not able to warn
you of a sudden loss of pressure, e.g.
following penetration by a foreign object .In
this event, brake the vehicle until it comes to
a standstill. Do not carry ou tany sudden
steering maneuvers.
The tire pressure monitor has a yellow 000A
warning lamp in the instrument cluster for
indicating pressure loss/malfunctions (USA)
or pressure loss (Canada). Depending on how
the warning lamp flashes or lights up, an
underinflated tire or a malfunction in the tire
pressure monitor is displayed:
R if the 000A warning lamp is li tcontinuously,
the tire pressure on one or more tires is
significantly too low. The tire pressure
monitor is not malfunctioning.
R USA only: if the 000Awarning lamp flashes
for 60 seconds and then remains lit
constantly, the tire pressure monitor is
malfunctioning.
Only vehicles with steerin gwheel buttons: the
on-board computer displays information on
tire pressure. After a few minutes of driving,
the current tire pressure of each tire is shown
in the on-board computer.
USA only: if the tire pressure monitor is
malfunctioning, it may be more than
10 minutes before the malfunction is shown.
The 000A tire pressure warning lamp flashes
for 60 seconds and then remains lit. When the
malfunction has been rectified, the 000Atire
pressure warning lamp goes out after a few
minutes of driving.
The tire pressure values indicated by the on-
board computer may differ from those
measured at a gas station with a pressure
gauge. The tire pressures shown by the on-
board computer refer to those measured at
sea level. At high altitudes, the tire pressure
value indicated by a pressure gauge are
higher than those shown by the on-board computer. In this case, do not reduce the tire
pressures.
If radio transmitting equipment (e.g. wireless
headphones, two-way radios) is operated
inside the vehicle or in the vicinity of the
vehicle, this can interfere with the operation
of the tire pressure monitor.
Checking the tire pressure
electronically (vehicles with steering
wheel buttons)
Tire pressure display
Using the steering wheel buttons
X
Turn the key to position 2in the ignition
lock.
X Press the 0010or0007 button repeatedly
until the standard display is shown
(Y page 182).
X Press the 0001or0009 button repeatedly
until the current pressure of the individual
tires is shown in the display.
If the vehicle is parked for longer than
20 minutes or you then drive at less than
18 mph (30 km/h), the Tire pres.displayed after driving for
several minutes message appears.
i The tire pressure value shown in the
display may differ from those measured at
a gas station using a pressure gauge. The
on-board computer will generally give you
a more exact value.
Tire pressure loss warning system Vehicles with steering wheel buttons
If the tire pressure monitor detects a
significant pressure loss on one or more tires,
the on-board computer displays a warning282
Tire pressureWheels and tires
message. The
000Atire pressure loss warning
lamp in the instrument cluster (Y page 218)
lights up.
The tire pressure is show nin2red rectangles.
The pressure of the tire concerned is shown
in one of the two rectangles (Y page 192).
Additionally, a warning tone sounds.
Each tire that is affected by a significant loss
of pressure is highlighted in the pressure
display.
Restarting the tire pressure monitor When you restart the tire pressure monitor,
the currently set tire pressure are taken as
reference values for monitoring.
In most cases, the tire pressure monitor
detects the new reference values
automatically, e.g. after you have:
R changed the tire pressure
R changed wheels or tires
R installed new wheels or tires
However, you can also define reference
values manually as described here.
Before restarting the tire pressure
monitor:
X Set the tire pressure to the value
recommended on the Tire and Loading
Information placard or the tire pressure
table on the B-pillar on the driver's side
(Y page 278).
Observe the notes on tire pressure when
doing so (Y page 278).
X Make sure that the tire pressure is correct
on all four wheels. Restarting the tire pressure monitor
(vehicles without steering wheel
buttons):
X
Turn the key to position 2in the ignition
lock.
X Press the 0004menu button on the
instrument cluster repeatedly until the
display shows the following message:
+CAL- TPMS X
Press the 000Ebutton on the instrument
cluster.
The display shows:
OK TPMS The tire pressure monitor activation
process has begun. The tire pressures
measured for the individual wheels are
stored as the new reference values,
provided that the tire pressure monitor
considers them to be plausible.
If you wish to cancel the restart:
X Press the 000Fbutton or the 0004menu button
on the instrument cluster.
The activation process is canceled
automatically if 30 seconds elapse with no
input.
Restarting the tire pressure monitor
(vehicles with steering wheel buttons):
X Turn the key to position 2in the ignition
lock.
X Press the 0010or0007 button on the
steering wheel repeatedly until the
standard display is shown (Y page 182).
X Press the 0001or0009 button on the
steering wheel repeatedly until the current
pressure of the individual tires is displayed
or the display shows the following
message:
Tire pres. displayed after driving
for several minutes
X
Press the 0007reset button on the
instrument cluster.
The display shows the following message: Tire pressure
283Wheels and tires Z
Loading the vehicle
Instruction labels for tires and loads
G
WARNING
Overloaded tires can overheat, causing a
blowout .Overloaded tires can also impair the
steering and driving characteristics and lead
to brake failure. There is a risk of accident.
Observe the load rating of the tires. The load
rating must be at least halfoft he GAWR of
your vehicle. Never overload the tires by
exceeding the maximum load. The Tire and Loading Information placard on the
driver’s door B-pillar
Two instruction labels on your vehicle show
the maximum possible load.
(1) Only for vehicles with a gross weight of
less than 10,000 lbs (4,536 kg):
Tire and Loading Information placard 0005
is on the B-pillar on the driver's side. Tire
and Loading Information placard 0005
shows the permissible number of
occupants and the maximum permissible
load of the vehicle. It also contains details
of the tire sizes and corresponding
pressures for tires mounted at the
factory.
(2) The vehicle identification plate is located on the base of the driver's seat. The
vehicle identification plate informs you of
the gross vehicle weight rating. It is made
up of the vehicle weight, all vehicle
occupants, the fuel and the cargo. You
can also find information about the maximum Gross Axle Weight Rating on
the front and rear axle.
The maximum gross axle weight rating is
the maximum weight that can be carried
by one axle (front or rear axle). Do not
exceed the maximum gross vehicle
weight or the maximum gross axle weight
rating for the front or rear axle.
Tire and Loading Information placard
General notes Only vehicles with a gross weight of less than
10,000 lbs (4,536 kg) have a Tire and Loading
Information placard on the B-pillar on the
driver's side.
Maximum permissible gross vehicle
weight rating 0005
Maximum number of seats
0006 Maximum permissible gross vehicle
weight rating
X Specification for maximum gross vehicle
weight 0006is listed in the Tire and Loading
Information placard: "The gross weight of
occupants and luggage must not exceed
XXX kilograms or XXX lbs."
The gross weight of all vehicle occupants,
cargo, luggage and trailer load/noseweight (if
applicable) must not exceed the specified
value.
i The details on the Tire and Loading
Information placard illustration are only an 286
Loading the vehicleWheels and tires
0026
Maximum tire pressure (Y page 280)
0025 Manufacturer
0023 Tire material (Y page 292)
0024 Tire size designation, load-bearing
capacity and speed index (Y page 290)
0018 Tire name
The markings described above are on the tire
in addition to the tire name (sales
designation) and the manufacturer's name.
i Tire data is vehicle-specific and may
deviate from the data in the example.
Tire size designation, load bearing index
and speed index G
WARNING
Exceeding the stated tire load-bearing
capacity and the approved maximum speed
could lead to tire damage or the tire bursting.
There is a risk of accident.
Therefore, only use tire types and sizes
approved for your vehicle model. Observe the
tire load rating and speed rating required for
your vehicle. 0005
Design standard
0006 Tire width
0026 Nominal aspect ration in %
0025 Tire code
0023 Rim diameter
0024 Load bearing index
0018 Speed index General:
depending on the manufacturer's
standards, the size imprinted in the tire wall
may not contain any letters or may contain
one letter 0005that precedes the size
description
If "LT" precedes the size description (as
shown above): these are light truck tires
according to U.S. manufacturing standards.
If "C" precedes the size description: these are
commercial motor vehicle tires according to
European manufacturing standards.
Tire width: tire width0006shows the nominal
tire width in millimeters.
Aspect ratio: aspect ratio0026is the size ratio
between the tire height and tire width and is
shown in percent.T he aspect ratio is
calculated by dividing the tire width by the tire
height.
Tire code: tire code0025specifies the tire type.
"R" represents radial tires. "D" represents
diagonal tires, "B" represents diagonal radial
tires.
Rim diameter: rim diameter0023is the
diameter of the bead seat, not the diameter
of the rim flange. The rim diameter is
specified in inches (in).
Load-bearing index: load-bearing index0024
is a numerical code that specifies the
maximum load-bearing capacity of a tire.
Do not overload the tires by exceeding the
specified load limit. The maximum
permissible load can be found on the
vehicle's Tire and Loading Information
placard on the B-pillar on the driver's side
(Y page 286).
Example:
The load-bearing index 120 indicates a
maximum load of 3,042 lb (1,380 kg) for the
tire. If two load-bearing capacity indices are
specified (as shown above), the first number
states the load-bearing capacity for single
tires, the second number the load-bearing
capacity for twin tires. For further information
on the maximum tire load in kilograms and
pounds, see (Y page 291).290
What you should know about wheels and tiresWheels and tires