Porsche cayman gt4 Owner's Manual page 96

Speed warning - "Tire pressure Reduce
speed"
At speeds above 165 mph (270 km/h):
– The pressure in the tire has dropped by more
than 4 psi/0.3 bar/30 kPa. This pressure
loss is a danger to road safety.
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When the tire pressure warning appears,
reduce speed to below 165 mph (270 km/h)
until the warning disappears.
When driving at very high speeds, increase the
tire pressure to the required pressure
(differential pressure value "0.0").
For information on tire sealing compound:
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Please see the chapter "FILLING IN SEALANT"
on page 200.
94
Instrument Panel and Multi-Function Display
Warning light
The warning light in the instrument panel lights up:
– When a loss in pressure has been detected.
– In the event of a defect in Tire Pressure
Monitoring System or a temporary fault.
– When learning new fitted wheels/wheel
transmitters, as long as the vehicle's own
wheels have not yet been recognized.
A warning message also appears on the multi-
function display in the instrument panel.
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Please see the chapter "OVERVIEW OF
WARNING AND INFORMATION MESSAGES"
on page 109.
The tire pressure warning light on the instrument
panel goes out only when the cause of the fault
has been rectified.
Changing a wheel and replacing tires
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New wheels must be fitted with radio
transmitters for Tire Pressure Monitoring
System.
Before tires are changed, the battery charge
condition of the wheel transmitters should be
checked.
We recommend that you get an authorized
Porsche dealer to do this work as they have
trained workshop personnel and the necessary
parts and tools.
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Switch off the ignition when changing a wheel.
The tire settings on the multi-function display must
be updated after changing a wheel.
If the tire settings are not updated, the message
"Tire change? Update settings" is displayed on
the multi-function display.
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Update the multi-function display settings the
next time the vehicle is stationary.
Pressure increase as the result of
temperature increase
In accordance with physical principles, the tire
pressure changes as the temperature changes.
For every 18 °F (10 °C) change in temperature,
the tire pressure increases or decreases by
approx. 1.5 psi (0.1 bar/10 kPa).