Tyre Pressure Monitoring - Volvo XC90 TWIN ENGINE Owner's Manual

Related information
•
Tyres (p. 508)
•
Check tyre pressure with the tyre pressure
monitoring system (p. 513)
•
Inflate tyres with the compressor from the
emergency puncture repair kit (p. 521)
•
Approved tyre pressures (p. 595)
Standard in certain markets.
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Tyre pressure monitoring

The tyre pressure monitoring system, Tyre
Pressure Monitoring System (TPMS), gives a
warning with an indicator symbol in the driver
display when the pressure in one or more of the
car's tyres is too low.
If the symbol first flashes for about one minute
and then changes to a constant glow, it may indi-
cate that the system cannot detect or warn of low
tyre pressure as intended.
Symbol Specification
The symbol illuminates in the event
of low tyre pressure.
In the event of a fault in the TPMS
system, the symbol will first flash
for approx. one minute and then
illuminate with a constant glow.
System description
TPMS measures differences in rotation speed
between the different wheels via the ABS system
in order to be able to determine whether they
have the correct tyre pressure. If the tyre pres-
sure is too low, the tyre's diameter is changed
and, as a result, so is its rotation speed. By com-
paring the tyres with each other the system can
determine whether one or more tyres have pres-
sure that is too low.
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When the tyre pressure is too low, the indicator
symbol for low tyre pressure is illuminated in the
display and a message is shown, see also the
heading "Message in the driver display" below.
WHEELS AND TYRES
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511