Porsche Cayenne 2005 Owner's Manual page 98

Pressure increase as the result of
temperature increase
A - Tire pressure
B - Tire temperature
C - Tire pressure for cold tires
D - Tire pressure for hot tires
E - Pressure increase as the result of temperature
increase
F - Pressure drop in faulty/leaking tires
1 - Required-pressure line
2 - Notification of tire-pressure loss (-3 to -6 psi/from -0.2
to - 0.4 bar)
3 - Flat-tire warning (as of -6 psi/-0.4 bar)
98
Controls, Safety, Instruments
In accordance with physical principles, the air
pressure changes as the temperature changes.
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The tire pressure increases or decreases by
around 1.5 psi (0.1 bar) for a temperature change
of 50°F (10°C).
Tire pressure specifications
The tire pressure must match the prescribed value
(required pressure).
You can find information on the tire pressure for
cold tires (68°F/20°C):
– In the TYRE PRESSURE menu (filling informa-
tion):
As a deviation from the required pressure for
each wheel if the system has learned the
values.
– In the TYRE PRESSURE menu (filling informa-
tion):
As a required pressure for each axle if the
system has not learned the values.
– And in the front left door aperture for each
wheel.
f Please observe the chapter "TIRE PRESSU-
RES, COLD" on Page 350.
Insufficient tire pressure can cause tires to
overheat and thus be damaged – even invisibly.
Hidden tire damage is not eliminated by subse-
quently correcting the tire pressure.
f Please observe the chapter "TIRES/WHEELS"
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on Page 269.