Porsche 2007 Cayenne Owner's Manual page 156

f If a tire pressure message is displayed, correct
the tire pressure at the next opportunity.
f Incomplete entries or selection of the wrong
tires on the multi-purpose display affect
correct indication of warnings and messages.
The settings in the TYRE PRESSURE menu
must be updated after wheel changes, use of
a spare wheel or changes in vehicle loading.
f Use only the pressure differences shown in the
TYRE PRESSURE menu or from tire pressure
messages or warnings when correcting the
tire pressure.
f Tires lose air over time without a tire defect
being present. A tire pressure warning will then
appear on the multi-purpose display.
Correct tire pressure.
156
Multi-Purpose Display and Instruments
Functional description of Tire Pressure
Monitoring
Tire Pressure Monitoring continuously monitors
tire pressure and tire temperature on all four
wheels and warns the driver when the tire
pressure is too low.
The display as well as the settings for Tire
Pressure Monitoring take place on the multi-
purpose display in the sub-menu
TYRE PRESSURE.
However, the tire pressure must still be set
manually on the wheel.
The deviations in the tire pressures from the
required pressures are shown in the sub-menu
TYRE PRESSURE.
Example:
If the tire pressure display shows "–4 psi
(–0.3 bar)", you must increase the tire pressure by
4 psi (0.3 bar).
The tire pressures to be monitored are fixed in the
Tire Pressure Monitoring system and cannot be
changed.
The following settings must be made to permit
correct monitoring.
– Tires
Select the type and size of the tires fitted on
the vehicle.
– Load
Select the type of loading.
Note on operation
Settings can be made only when the vehicle is
stationary.
f For information on tires and wheels:
Please observe the chapter "TIRES/WHEELS"
on Page 317.