Tpms (Tyre Pressure Monitoring System) - Alfa Romeo giulia Owner's Handbook Manual

TPMS (Tyre Pressure Monitoring
System)
66) 67) 68) 69) 70) 71) 72)
30)
The car is equipped with Tyre Pressure
Monitoring System (TPMS), which can
advise the driver in the event of
insufficient tyre pressure on the basis of
the pressure when cold indicated in the
"Technical specifications" chapter.
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 unit
fig. 116.
116
The inflation pressure varies, depending
on the temperature, of about 0.07 bar
(1 psi) every 43.7°F (6.5°C). This means
that a decrease of the external
temperature corresponds to a decrease
of the tyre pressure. Always adjust the
tyre inflation pressure when cold. This is
defined as the tyre pressure after at
least 3 hours of vehicle inactivity or
travel of less than 1 mi (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 (
instrument panel on), increase the
inflation pressure up to the prescribed
cold inflation value.
The system automatically updates and
06016S0009EM
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 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 2.3 bar (33.4 psi) ,
if the ambient temperature is 68°F
(20°C) and the detected tyre pressure is
1.95 bar (28.3 psi), a temperature
reduction of 19.4°F (−7°C) results in a
decrease in tyre pressure, bringing it to
approximately 1.65 bar (23.9 psi). This
pressure is sufficiently low to activate
the warning light.
Heating of tyres due to driving the
vehicle may increase tyre pressure up to
approximately 1.95 bar (28.3 psi), 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.
IMPORTANT The TPMS is designed for
original tyres and wheels. The prescribed
pressures and consequent alarm
thresholds set in the TPMS are based on
warning light on
the dimensions of the tyres fitted on the
vehicle. Using spare wheels of a size, type
and/or design different from the original
ones may cause an irregular operation of
the system and damage the sensors.
Aftermarket fitted wheels may damage
the sensors. Using aftermarket tyre
sealants may damage the Tyre Pressure
Monitoring System (TPMS) sensor. If
aftermarket tyre sealant is used it is
recommended to go to an Alfa Romeo
Dealership to have the sensors checked.
111