Porsche 911 Manual page 241

spare wheel.
e Do not continue driving with defective tyres.
Have defective tyres replaced immediately. Visit
a qualified specialist workshop. Porsche recom-
mends a Porsche partner as they have trained
workshop personnel and the necessary parts and
tools.
e Do not drive with tyres in which the tyre pressure
drops again very quickly. In case of doubt, have
tyres checked by a qualified specialist workshop.
Porsche recommends a Porsche partner as they
have trained workshop personnel and the neces-
sary parts and tools.
High speed with comfort
WARNING
pressure
Driving at excessive speeds when the comfort pres-
sure is active will destroy the tyres and wheels.
e Reduce speed to below the maximum speed
displayed on the instrument cluster.
e Inflate the tyres to the standard tyre pressure
when driving at higher speeds.
Faults in the Tyre Pressure Monitoring (TPM)
system
TPM will not function correctly in the following sit-
uations, for example:
– If the Tyre Pressure Monitoring is faulty
– If wheel transmitters for Tyre Pressure Monitor-
ing are missing
– During the learning phase after the tyre settings
have been updated
– After a wheel change without updating the tyre
settings
– If tyre temperatures are too high
Viewing tyre pressure
The individual tyre pressures are only displayed
above a speed of approx. 25 km/h (16 mph) or if the
tyre has been inflated by at least 0.1 bar (1.5 psi).
When the ignition is switched on after the vehicle
has been stationary for more than approx. 10 mi-
nutes, lines (-.-) are shown instead of the tyre
pressures.
e Tyre pressure e Current press.
The display of the actual pressure is only for infor-
mation. The tyre pressures change depending on the
temperature.
e Under no circumstances should the tyre pres-
sures be changed based on this display.
Displaying pressure difference
Fig. 214: Example of pressure difference
b b The vehicle is stationary.
e Tyre pressure e Deviation
The difference to the required pressure is displayed
on the relevant wheel. Example:
If –0.1 bar (–1.5 psi) is displayed for the rear right
wheel, 0.1 bar (1.5 psi) must be added to this tyre.
The displayed pressures take into account the tyre
temperature.
Tyres and Wheels
e Always use the pressure deviation from the dis-
play or from the corresponding tyre pressure
warning to correct the tyre pressure.
Setting tyres
Settings for the tyre type and tyre size, load and
comfort/standard pressure can be made via the
touch display in the dashboard:
> Please refer to chapter "Tyre Pressure Monitor-
ing (TPM)" on page 238.
Configuring Tyre Pressure Moni-
toring (TPM) in the PCM
Incorrect settings
WARNING
Low or high tyre pressure irreparably damages the
tyre and the wheel, lengthens the braking distance
and greatly increases the risk of an accident.
Despite the Tyre Pressure Monitoring system, it is
still the driver's responsibility to ensure that the
tyres are inflated with the correct tyre pressure and
the vehicle settings are correct. Incomplete or in-
correct settings may affect the accuracy of warnings
and messages.
e Adapt tyre pressure to suit your specific tyres
and the payload.
e Make sure that the settings in the TPM menu
correspond to the tyres fitted on the vehicle and
its payload (especially after a wheel change or
changes in vehicle loading).
e Then select the type and size of fitted tyre again
in the TPM menu, even if the settings for the
newly fitted set of wheels are the same as for the
old wheels.
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