2005 PORSCHE CAYENNE TURBO tire type

96
Controls, Safety, Instruments
Warning “When vehicle stops,
Hit selection”If you drive off after changing a wheel or inflating
the tires and neglect to make a selection in the
screen SELECTION AFTER WARNING, the following
message will appear:
WHEN VEHICLE STOPS, HIT SELECTION.
fThe next time you stop the vehicle, perform
the settings in the “Selection after warning”.
Wheel change messageThe WHEEL CHANGE? message CHECK
SETTINGS appears after a wheel change, if the
tire type and tire size of the new tires have not
been set in the TYRE PRESSURE > SETTINGS
menu.
When the vehicle is stationary, the display
changes to SELECTION AFTER WARNING.
fPlease observe the chapter “SELECTION
AFTER WARNING” on Page 95.
fSelect WHEEL CHANGE. The menu automati-
cally changes to TYRE TYPE.
fSelect the appropriate tire type and tire size.
Only if the tire type and size are selected will
the tire pressure monitoring system re-learn
the tires.
Message “Spare wheel or sealing set
operation”The message SPARE WHEEL OR SEALING SET
OPERATION? appears after switching on the igni-
tion if a spare wheel type (spare wheel, collapsible
spare wheel, or sealing set) was set.
fSelect YES or NO with the rocker switch.
fPress RESET switch.

Controls, Safety, Instruments
97
Ye s :
– In case of sealing-set operation, the menu
changes directly to the basic screen. All
settings are retained.
– If the vehicle is operated with a collapsible
spare wheel or spare wheel, the warning mes-
sage “SYSTEM NOT ACTIVE, WORKSHOP” is
initially displayed for 10 seconds. The system
then returns to the basic screen.
No:
The display automatically returns to the menu
TYRE PRESSURE > SETTINGS.
fSet the mounted tire set with tire type and tire
size. The system will re-learn the tires.
No monitoringIn the event of faults the tire pressure monitoring
cannot monitor the tire pressure.
The warning light on the instrument panel and a
message on the multi-purpose display light up.
Monitoring is not active when:
– the tire pressure monitoring system is faulty,
– wheel transmitters for the tire pressure
monitoring system are not present,
– temporarily after changing a wheel,
– has detected too many wheel transmitters,
– there is external interference by other radio
sources, e.g., wireless headphones,
– Tire temperatures are too high.
fPlease observe the chapter “WARNING LIGHTS
AND WARNING MESSAGES” on Page 106.All warnings and messages in the tire pressure
monitoring system are also indicated by the
warning light in the instrument panel.
The warning light goes out as soon as all faults are
remedied.
Tire pressure monitoring warning
light

108
Controls, Safety, Instruments
Tire pressure too low – Add air System detects a pressure loss of at least 2,9 psi/0,2 bar.
Correct tire pressure at the next opportunity.
Collapsible spare wheel/sealing set
max. 50 mph (80 km/h)Observe maximum permitted speed.
Collapsible spare wheel/51 psi/3,5 bar
max. 50 mph (80 km/h)Information on driving with a collapsible spare wheel.
Observe maximum speed of max 50 mph or 80 km/h and
required pressure of 51 psi or 3,5 bar.
System not activeIndication when spare wheel or collapsible spare wheel is used
or tire pressure monitoring system is faulty.
Consult a qualified specialist workshop.
Select new set of wheels in the Tire pressure menu after chang-
ing the wheels.
System not active – Brief disturbance External interference of excessive temperature at the wheel
transmitters. System will reactivate itself.
System not active –
Too many wheel transmittersTire pressure monitoring system detects more than 4 wheel
transmitters.
(winter wheels in the luggage compartment, for example)
Tire pressure monitoring system will reactivate itself after the
additional wheel transmitters have been removed.
No monitoring – System learning After the tire type and size are selected in the tire pressure
menu, the system re-learns the tires.
Wheel change? Check settings Display after a wheel change without changed settings in the tire
pressure menu. Select tire type and size.
When vehicle stops: Hit selection Displayed after a flat tire if the system was not informed about
the work performed.
Make a selection on the multi-purpose display when the vehicle
is stationary.
Monitoring off Tire pressure monitoring was intentionally deactivated.
Tire pressure monitoring can be switched on or off on the
multi-purpose display.
Instrument
panelMulti-purpose
displayText display Meaning/measures

Shifting Gear, Traction Systems
219
Engine Braking Support
(Assistance when heading downhill)The Porsche Down-Hill Assistant is an assistance
system which helps the driver at slower downhill
driving up to approx. 12 mph (20 km/h), e.g., on
steep slopes or on wintry mountain roads.
As long as the accelerator pedal is not used when
traveling downhill, the Porsche Down-Hill Assistant
is active and brakes the vehicle.
The braking ability of the Engine Braking Support
is affected by slippery surfaces (e.g., on icy or
loose surfaces), like all brakes.
If road grip is lost on one or more wheels, the
system brakes the wheels which have good road
contact.
Warning!
Risk of accident. Reduced braking ability on
a slippery surface.
fAlways adjust your driving style to the driving situationConditions:
– The accelerator pedal must not be used when
travelling downhill.
– The speed must not
exceed 12 mph (20 km/h).
– The selector lever position D or Mmust be
engaged.
Tip on driving
The Porsche Down-Hill Assistant is active when dri-
ving downhill either forwards or backwards.
Checks on test standsPower measurement
Power measurements on roller test stands are not
approved by Porsche.
Brake tests
Brake tests must be carried out only in High Range
and on plate-type test stands or roller test stands.
The following limit values must not be exceeded
on roller test stands:
– Testing speed 4.7 mph (7.5 km/h)
– Test duration 20 seconds
Parking brake test
Parking brake tests on the brake tester must be
performed only with the ignition switched off and
the selector lever in position N.
Balancing wheels on the vehicle
During finish balancing of the wheels, the entire ve-
hicle must be lifted and the wheels must be free to
turn.

274
Practical Tips, Minor Repairs
Tire traction
Warning!
When driving on wet or slushy roads, a
wedge of water may build up between the
tires and the road. This phenomenon is
known as “hydroplane“ and may cause par-
tial or complete loss of traction, vehicle con-
trol or stopping ability.
fReduce speed on wet surfaces to prevent this.Tire lifeTire life depends on various factors, i.e., road sur-
faces, traffic and weather conditions, driving hab-
its, type of tires and tire care.
fInspect your tires for wear and damage before
driving off. If you notice uneven or substantial
wear, wheels might need alignment or tires
should be balanced or replaced.
Tire wearThe original equipment tires on your Porsche have
built-in tire wear indicators. They are molded into
the bottom of the tread grooves and will appear as
approximately 1/2 in. (12 mm) bands when the
tire tread depth is down to 1/16 of an in (1.6 mm).
When the indicators appear in two or more adja-
cent grooves, it is time to replace the tires. We
recommend, however, that you do not let the tires
wear down to this extent.
Worn tires cannot grip the road surface properly
and are even less effective on wet roads.
In the United States, state laws may govern the
minimum tread depth permissible. Follow all such
laws.
Danger!
Driving on worn tires can result in loss of con-
trol of the vehicle and could cause serious
personal injuries or death.
fDo not drive with worn tires or tires showing
cuts or bruises as they may lead to sudden de-
flation and loss of control which could cause
severe personal injury.
fSpecialized high performance tires on high
performance sport utility vehicles exhibit more
wear than those on a family sedan, or even a
high performance sedan.
Therefore, it is important to check your tire
pressure and condition at least every two weeks.
fIf you notice that tires are wearing unevenly,
consult your Porsche dealer.
Uneven wear may not always be due to improper
wheel alignment. It can be the result of individual
driving habits such as cornering at high speeds. If
the tire pressure is not checked and adjusted reg-
ularly, abnormal tire wear can also occur.

276
Practical Tips, Minor Repairs
Tire replacementsfUse only tire makes and types tested by
Porsche.
Only tires with the same manufacturer and
with the same specification code (e.g. “N0“,
“N1“...) should be mounted on the vehicle.
Tires should be replaced no less than on one axle
at the time. Only tires of the same make and type
must be used. Mixed tires are not permissible and
will affect vehicle performance, safety, and can
affect vehicle warranty.
Porsche dealers can recommend the most current
replacement tire options for your vehicle.
Initially, new tires do not have their full traction.
You should therefore drive at moderate speeds
during the first 60 - 120 miles (100 - 200 km).Tires should be replaced no less than on one axle
at the time. Only tires of the same make and type
must be used. Mixed tires are not permissible.
Initially, new tires do not have their full traction.
You should therefore drive at moderate speeds
during the first 60 - 120 miles (100 - 200 km).
If new tires are installed only on one axle, a notice-
able change in handling occurs due to the different
tread depth of the other tires. This happens espe-
cially if only rear tires are replaced. However, this
condition disappears as the new tires are broken
in.
fPlease adjust your driving style accordingly.
Installation of new tires should only be done by a
qualified tire technician.
Valves
fUse only plastic valve caps.
fThe rubber valves must be replaced whenever
the tires are changed.
fThe fitting and replacement specifications
must be observed for metal valves.
fOnly use Original Porsche metal valves.

Practical Tips, Minor Repairs
281
Example of InscriptionInscription on radial tireATire size
Example: P 255/55R18 109 Y
–P - The tire is designed for Passenger vehicle.
There is not on every tire this information.
–255 - Indication of tire width in mm
–55- Indication of tire height to tire width ratio
in percent
–R- Belt type code letter for radial
–18 - Indication of rim diameter in inches–109 - Load capacity coefficient
–Y - Speed code letter
B TIN (Tire Identification Number)
Example: DOT xx xx xxx xxxx
–DOT
The DOT symbol indicates that the tires com-
ply with the requirements of the US Depart-
ment of Transportation and provides informa-
tion about:
– first two-digit code means manufacture’s iden-
tification mark.
– second two-digit code means tire size.
– third three-digit code means tire type code.
– fourth four-digit code means Date of manufac-
ture.
If, for example, the last four numbers read
1204, the tire was produced in the 12th week
of 2004.
C Tire ply composition and material
The number of layers in the tread and sidewalls
and their material composition.
D Maximum permissible inflation pressure
The maximum permissible cold inflation pressure
to which a tire can be inflated.
fDo not exceed the permissible inflation pres-
sure.
E Maximum Load rating
The maximum load in kilograms and pounds can
be carried by the tire. If you replace tires always
use a tire that has the same maximum load rating
as the factory installed tire.
F Term of tubeless or tube tire
Identification for tubeless tires.
GRadial
The identification indicates if the tire has radial
structure.

Practical Tips, Minor Repairs
285
CompressorOn vehicles without level-control systems, there is
an additional compressor with pressure tester un-
der the loadspace floor.
On vehicles with level control, you can use the
compressor of the level-control system to fill the
tires.
The filler hose required for this purpose can be
found under the left rear seat.
fPlease observe the chapter “FOLDING REAR
SEATS FORWARD” on Page 37.
fPlease observe the chapter “INFLATING TIRES
ON VEHICLES WITHOUT AIR SUSPENSION” on
Page 295.
Wheel BoltsfAlways clean the wheel bolts before installing.
Maintenance note
fWheel bolts must not be greased.
fReplace damaged wheel bolts.
Only use the original Porsche wheel bolts spe-
cially designed for this vehicle type.Tightening torque
Tightening torque of the wheel bolts 118 ftlb.
(160 Nm).
Security wheel boltsThe adapter (wrench socket) for the security
wheel bolts is located in the tool box.
To loosen or tighten the wheel bolt with anti-theft
protection, the adapter must be used between the
wheel bolt and the wheel bolt wrench.
fWhen positioning the wrench socket, ensure
that it engages fully in the teeth of the wheel
bolt.
Note on operation
If the wheels have to be removed at the workshop,
please do not forget to hand over the socket for
the security wheel bolts along with the car key.