Tyre Pressure Monitoring - Volvo XC 90 Owner's Manual

Tyre pressure monitoring

The system for monitoring tyre pressure, Tyre
Pressure Monitoring System (TPMS), warns
when the pressure is too low in one or more of
the car's tyres with an indicator symbol that
lights up in the driver display.
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.
Tyre pressure monitoring uses detectors located
on the air valve in each wheel. When the car is
driven at approx. 30 km/h or faster the system
detects the tyre pressure. If the pressure is too
low, a low tyre pressure indicator symbol in the
driver display illuminates and a message is
shown.
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.
Standard in certain markets.
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General information on the tire pressure
monitoring system
Each tyre, including the spare tyre*, should be
checked once a month. When checking, the tyre
should be cold and have the air pressure recom-
mended by the car manufacturer specified on the
tyre pressure label or in the tyre pressure table. If
the car has tyres of a different size than that rec-
ommended by the manufacturer, find out what
the correct air pressure level is for these.
As an extra safety feature, the car is equipped
with a tyre pressure monitoring system (TPMS),
which shows when the air pressure of one or
more tyres is too low. When the indicator symbol
for low air pressure is lit, stop and check the tyres
as soon as possible and inflate to the correct air
pressure.
Driving on tyres with low tyre pressure may cause
the tyre to overheat, which can cause a puncture.
Low tyre pressure also reduces fuel efficiency
and tyre service life, and can affect car handling
and stopping ability. Note that TPMS does not
replace regular tyre maintenance. It is the driver's
responsibility to maintain correct tyre pressure,
even if the limit for low tyre pressure has not
been reached so that the indicator symbol illumi-
nates.
The car is also equipped with a TPMS system
fault indicator, which indicates when the system
WHEELS AND TYRES
is not functioning correctly. The TPMS system
fault indicator is combined with the indicator sym-
bol for low tyre pressure. When the system
detects a fault, the symbol in the driver display
will flash for about one minute and then remain
illuminated. This procedure will be repeated when
the car is started until the fault has been rectified.
When the symbol is illuminated, the system's abil-
ity to detect or warn of low tyre pressure may be
affected.
A TPMS system fault can occur for several rea-
sons, such as after changing to a spare tyre, or
changing tyres or wheels that prevent TPMS from
functioning properly.
Always check the indicator symbol for TPMS
after changing one or more tyres to make sure
the new tyre or wheel is functioning correctly with
TPMS.
Both factory-fitted and optional wheels can be
equipped with TPMS sensors in the valves. If the
spare wheel or a wheel without a TPMS detector
is used, an error message will be shown in the
driver display after a few minutes of driving.
The system does not replace normal tyre mainte-
nance.
* Option/accessory, for more information, see Introduction.
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