Porsche Cayenne Owner's Manual page 160

f Set the fitted wheel set with tire type and tire
size.
Please observe the chapter "SETTING THE
TIRE TYPE AND SIZE" on Page 153.
Note on operation
The reminder SPARE WHEEL/SEALING SET
OPERATION? goes out automatically after approx.
10 seconds if no selection is made during this
time. The original selection "YES" is then
maintained.
160
Multi-Purpose Display and Instruments
Faults in Tire Pressure Monitoring
In the event of faults, Tire Pressure Monitoring
cannot monitor the tire pressure. A distinction is
made between partial monitoring and inactive
system.
In the case of partial monitoring, the tire pressure
warning light on the speedometer flashes about
60 seconds and lights up thereafter permanently.
No message is output on the multi-purpose
display.
If Tire Pressure Monitoring is not active, the tire
pressure warning light on the speedometer
flashes about 60 seconds and lights up thereafter
permanently. A corresponding message is output
on the multi-purpose display.
The warning light goes out as soon as all faults
have been remedied.
Tire Pressure Monitoring switches to partial
monitoring if:
– there are up to two wheel transmitters not
present or faulty (e.g. a spare wheel or collaps-
ible spare wheel is fitted that does not have a
wheel transmitter).
In the event of partial monitoring, the value "_" is
displayed in the sub-menu TYRE PRESSURE (filling
information) at the position of the faulty or missing
wheel transmitter.
Tire Pressure Monitoring is not active in the
following cases:
– Tire Pressure Monitoring is faulty,
– at least three wheel transmitters for Tire
Pressure Monitoring are faulty or not present,
– temporarily after changing a wheel,
– too many wheel transmitters have been
detected,
– there is external interference by other radio
sources, e.g. wireless headphones,
– tire temperatures are too high.
For information on messages on the multi-purpose
display:
Please observe the chapter "OVERVIEW OF
WARNING MESSAGES" on Page 168.
Notes on tire pressure
Pressure increase as the result of tempera-
ture increase
In accordance with physical principles, the tire
pressure changes as the temperature changes.
The tire pressure increases or decreases by
around 1.5 psi (0.1 bar) for every 18 °F (10 °C)
change in temperature.
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 sub-menu TYRE PRESSURE (filling infor-
mation):