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

WHEELS AND TYRES

Tyre pressure monitoring system*

The tyre pressure monitoring system, Indirect
Tyre Pressure Monitoring System (ITPMS), 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.
Symbol Explanation
The symbol illuminates to indicate
low tyre pressure.
If there is a fault in the system the
tyre pressure warning symbol
flashes for approximately one
minute and then remains illumi-
nated.
System description
The tyre pressure monitoring system measures
differences in rotation speed between the differ-
ent wheels via the ABS system in order to be
able to determine whether they have the correct
tyre pressure. If the tyre pressure is too low, the
tyre's diameter is changed and, as a result, so is
its rotation speed. By comparing the tyres with
each other the system can determine whether
one or more tyres have pressure that is too low.
General information on the tyre monitoring
system
In the information below, the tyre monitoring sys-
tem is referred to generically as TPMS.
560
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 in 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 with tyres that have tyre pressure that is
too low may cause the tyre to overheat, which
can cause a puncture. Low tyre pressure also
reduces fuel efficiency as well as 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 illuminates.
The car is also equipped with a TPMS system
fault indicator, which indicates when the system
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 correctly.
Always check the indicator symbol for TPMS
after changing one or more tyres in order to
ensure the new tyre or wheel is working correctly
with TPMS.
Messages on the instrument panel
When the tyre pressure is too low, the indicator
symbol for low tyre pressure is illuminated in the
driver display and a message is shown.
•
Tyre pressure low Check tyres, calibrate
after fill
•
Tyre pressure system Temporarily
unavailable
•
Tyre pressure system Service required
To bear in mind
•
Always calibrate the system after a wheel
change or tyre pressure adjustment. See the
tyre pressure label on the driver's side door
* Option/accessory.