Volvo V 90 Cross Country, Owner'S Manual

Page: 487 / 594

WHEELS AND TYRES
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* Option/accessory. 485
Related information
•
Tyres (p. 482)
•
Checking tyre pressure with the tyre monitor-
ing system
*
(p. 487)
•
Inflate tyres with the compressor from the
emergency puncture repair kit (p. 494)
•
Approved tyre pressures (p. 574)
Tyre monitoring
*
The tyre 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.
If the symbol first flashes for approximately one
minute and then changes to a constant glow, it
may indicate 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.
•
The symbol flashes for approxi-
mately one minute and then
changes over to illuminating
with a constant glow in the
event of a fault in the ITPMS
system.
System description
ITPMS 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.
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.