Tire Pressure Monitoring System (Tpms) - Volvo XC 90 Owner's Manual

WHEELS AND TIRES
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Checking tire pressure
1. Remove the cap from the valve on one tire,
then firmly press the tire gauge onto the
valve.
2. Add air to reach the recommended air pres-
sure.
3. Replace the valve cap.
CAUTION
•
After inflating the tires, always reinstall the
valve cap to help avoid damage to the
valve from dirt, gravel, etc.
•
Use plastic valve caps only. Metal caps
could corrode and become difficult to
remove.
4. Visually inspect the tires to make sure there
are no nails or other objects embedded that
could puncture the tire and cause an air leak.
5. Check the sidewalls to make sure there are
no gouges, cuts, bulges or other irregulari-
ties.
6. Repeat this procedure for each tire, including
the spare.
490
NOTE
If you overfill the tire, release air by pushing
on the metal stem in the center of the valve.
Then recheck the pressure with your tire
gauge.
Tire Pressure Monitoring System
(TPMS)
TPMS provides a warning if inflation pressure in
one or more tires is too low. It also uses a sym-
bol (called a telltale) that will flash for
60 seconds and then glow steadily if there is a
system malfunction.
TPMS uses the rotational speed of the tires in
combination with signal analysis of the ABS sen-
sor signals to determine if they are properly infla-
ted. When a tire is under-inflated, its diameter
(and consequently also its rotational speed)
changes. By comparing the individual tires with
each other it is possible to determine if one or
more tires are under inflated. If inflation pressure
is too low, an indicator symbol will illuminate in
the instrument panel and a text message will be
displayed.
Symbol Explanation
The symbol illuminates to indicate
low tire inflation pressure.
If a malfunction occurs in the sys-
tem, the tire pressure warning sym-
bol will flash for approximately
1 minute and then remain illumi-
nated.
Each tire, including the spare (if provided), should
be checked monthly when cold and inflated to