Fiat Ulysse, Owner'S Handbook Manual

Page: 121 / 254

Cars with ESP may only
be fitted with tyres of the
same make, model and
size and be in good conditions.
GETTING TO KNOW YOUR CAR
120
ESP SYSTEM ACTION
The ESP system action is signalled by
warning light
ñ
flashing to inform the
driver that the vehicle stability and grip
are critical.
ESP failure indication
In the event of an ESP system failure,
it turns off automatically and warning
light
ñ
comes on together with the
relative message on the multifunction
display.
In the event of an ESP system failure,
the vehicle behaves as the version
without this type of system. We rec-
ommend you to contact a
Fiat Deal-
ership as soon as possible.
The ESP main components are:
– an electronic control unit which
processes the sensor signals and ap-
plies the best strategy;
– an angle sensor which detects the
steering position;
– four sensors which detect each
wheel rotation speed;
– a braking system pressure sensor;
– a yawing sensor which detects the
vehicle spinning around a vertical axis;
– a sensor which detects side accel-
eration (centrifugal force).
The ESP heart is the control unit
which processes the centrifugal forces
deriving from cornering on the basis
of the data coming from the sensors
installed on the vehicle. The yawing
sensor detects the vehicle spinning
around its vertical axis. Centrifugal
forces resulting from cornering are de-
tected by a highly sensible side accel-
eration sensor.
The ESP stabilising action is based on
the control unit processing of data
coming from the steering wheel rota-
tion sensors, side acceleration sensors
and wheel rotation speed sensors.
These signals make the control unit
recognise the driver’s manoeuvre
when he/she turns the steering wheel.
The control unit processes such in-
formation and is able to detect the ve-
hicle position at any time and compare
it with the driver’s wished direction. If
they do not match, the control unit is
able to adjust the vehicle’s position in-
stantly, by choosing the best strategy:
it can brake one or more wheels with
different force and reduce the engine
power, if needed.
Adjustments are made for continu-
ously adapting to the driver’s wished
travelling direction.
The ESP system action improves the
vehicle safety in many critical situations
and is useful especially when the
roadbed grip changes.