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93
Monitoring System (TPMS), which
can advise the driver in the event of
insufficient tyre pressure according to
the cold inflation pressure set by the
driver (see indications in the "Technical
specifications" chapter, "Cold tyre
inflation pressure" table).
The system comprises a radio-frequency
transmitter sensor fitted to each wheel
(on the rim inside the tyre), which is able
to send information on the inflation
pressure of each tyre to the control
modulefig.79.
79 06016S0009EM
Inflation pressure varies in relation to
temperature by about (0.07 bar) every
43.7 °F (6.5 °C). This means that when
the outdoor temperature falls, the tyre
pressure decreases. Always adjust the
tyre inflation pressure when cold. This
is defined as the tyre pressure after at
least 3 hours of car inactivity or travel of
less than 1 mile (1.6 km) after the 3 hour
interval.
The cold tyre inflation pressure must not
exceed the maximum pressure indicated
on the shoulder of the tyre: for further
details see the instructions in the "Rims
and tyres" paragraph, in the "Technical
data" chapter.
Tyre pressure increases when the
vehicle is driven. This is normal, and no
adjustment of the pressure is required.
The TPMS signals the driver a possible
insufficient pressure if this falls below
the warning limit for any reason,
including the effects of low temperature
and normal loss of pressure from the
tyre.
The TPMS will stop indicating
insufficient tyre pressure when it is equal
to or greater than the prescribed cold
inflation pressure.
Therefore, if insufficient tyre pressure is
indicated ( warning light on instrument
panel on), increase the inflation pressure
up to the prescribed cold inflation value.
The system automatically updates and
warning light switches off each
time the system receives the updated
inflation pressures. The vehicle might
need to be driven at a speed higher
than about 15.5 mph (25 km/h) up to 20
minutes for the TPMS to receive this
information.
Operating example
Supposing that the prescribed cold
inflation pressure (i.e. vehicle stationary
for at least 3 hours) is 33.4 psi (2.3 bar), if
the ambient temperature is 68°F (20°C)
and the detected tyre pressure is 28.3 psi
(1.95 bar), a temperature reduction of
19.4°F (−7°C) results in a decrease in tyre
pressure, bringing it to approximately
24 psi (1.65 bar).
This pressure is sufficiently low to
activate the warning light .
Heating of tyres due to driving the
car may increase tyre pressure up to
approximately 28.3 psi (1.95 bar), but
the warning light will stay on. In this
situation, the warning light will switch off
only after the tyres are inflated to the
prescribed cold pressure value for the
car.
WARNING
54) When driving on two-way roads where
there is no lane dividing centre line (e.g. on
country roads), the use of the ABSA, HAS,
TJA, LKA systems is strongly discouraged
as this system could detect the entire
carriageway as single-lane dividing lines.
55) The driving assistance systems are
designed to help driving the car. The driver
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