Porsche CARRERA GT-2004 Manual page 72

Tire pressure function of the on-board
computer
The on-board computer function tire pres-
sure displays the tire pressures dependent on
temperature in the four wheels.
You can watch the tire pressure rise as the tem-
perature increases while driving.
The display is only for information.
f Under no circumstances should the tire pres-
sures be changed based on this display.
Calling up on-board computer function tire
pressure
f Push operating lever up or down until the on-
board computer function tire pressure ap-
pears.
(selection field A must be switched off.
72
Controls, Instruments
Pressure Info in menu tire pressure
In accordance with physical principles, the air
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.
The tire pressure monitoring system takes this re-
lationship between tire pressure and temperature
into account.
You can read the tire pressures to be cor-
rected in this display.
The tire pressure to be corrected is indicated on
the displayed wheel.
Example: If "–2 psi" is displayed in the Pressure
Info menu, 2 psi must be added to the tires.
Note
The Tire pressure menu can only be called up
when the vehicle is stationary.
Calling up „Pressure info" display
f Push operating lever forward to switch on se-
lection field A
f Select "RDK" with the operating lever.
f Push operating lever forward.
The display changes to the Tire pressure
menu.
f Select "Pressure info" with the operating lever.
f Push operating lever forward.