2006 Alfa Romeo 147 four wheel drive

GETTING TO KNOW YOUR CAR
111fig. 99
A0A9017g
fig. 100
A0A9081g
With the gearbox in the CITYmode it is
still possible to carry out manual gearshift-
ing, both using the gear lever and the steer-
ing wheel controls. The gearbox remains in
theCITYmode.
The gear engaged (fig. 99) is always sig-
nalled on the display regardless of the se-
lected mode.
N= neutral;
1= first gear;
2= second gear;
3= third gear;
4= fourth gear;
5= fifth gear;
6= sixth gear
R= reverse.Failures of the Selespeed gearbox are sig-
nalled to the driver through a warning light
(
t) connected with the associated fail-
ure message (fig. 100) and accompanied
by an acoustic signal.
SYSTEM ACTIVATION
IMPORTANTWhen the driver’s door is
opened the Selespeed starts the hydraulic
part of the system to prepare it for when the
engine is started. This function (noted by
the turning of the electric pump) is deacti-
vated after 10 door openings/closings not
followed by actual system activation turning
the ignition key.
Turning the ignition switch to MAR, af-
ter about one second, the reconfigurable
multifunction display shows the gear en-
gaged (N,1,2,3,4,5,6,R); from this
moment onwards, the Selespeed system ac-
cepts gearshift commands.
IMPORTANTIf after 10 seconds the re-
configurable display does not show the gear
engaged or the warning light
t(togeth-
er with the message shown by the display)
stays on, turn the ignition key to STOPand
wait for the display to turn off, then repeat
system switch on. If the fault persists, con-
tact Alfa Romeo Authorised Services.

GETTING TO KNOW YOUR CAR
136
VDC SYSTEM
(Vehicle Dynamics Control)
The VDC is an electronic system that con-
trols vehicle stability, intervening on the dri-
ving torque and braking the wheels in a dif-
ferentiated manner, in the lack of grip, it
helps to bring the car back to the correct
direction.
When travelling the car is subjected to lat-
eral and longitudinal forces which can be
controlled by the driver as long as the tyres
offer adequate roadholding; when this falls
below the minimum level, the car begins
to divert from the course required by the dri-
ver.
Especially when travelling on an uneven
surface (such as paving, or due to the pres-
ence of water, ice or soil), changes in speed
(acceleration or braking) and/or course
(bends or the need to avoid obstacles) may
cause the tyres to lose grip.
When the sensors detect the conditions
that would lead to skidding, the VDC system
intervenes on the engine and on the brakes
producing a stabilising torque.
HOW THE VDC
SYSTEM WORKS
The VDC system is engaged automatical-
ly when the car is started and cannot be
switched off.
The basic components of the VDC system
are:
– an electronic control unit that process-
es the signals received from the various sen-
sors and brings about the most appropriate
strategy;
– a sensor that detects the position of the
steering wheel;
– four sensors that detect the turning
speed of each wheel;
– a sensor that detects rotation of the car
around its vertical axis;
– a sensor that detects lateral acceleration
(centrifugal force).
The heart of the VDC system is the VDC
control unit, which with the data supplied
by the sensors installed on the car calculates
the centrifugal forces generated when the
car is cornering. The yawing sensor, which
originates from the aeronautical industry, de-
tects the rotations of the car around its own
vertical axis. The centrifugal forces gener-
ated when the car is cornering are detect-
ed by a highly sensitive lateral acceleration
sensor. The VDC system helps the driver to keep
the car under control in the event of a loss
of tyre grip.
The forced induced by the VDC system to
control the loss of vehicle stability always
depend on the grip between the tyre and
the road surface.
The performance of the
system, in terms of active
safety should not induce the driver
to take pointless and unnecessary
risks. The style of driving must in
any case always be adapted to the
conditions of the road surface, vis-
ibility and traffic. The responsibil-
ity for road safety is always and
in any case the driver’s.
WARNING

CORRECT USE OF THE CAR
185
IMPORTANTWhen winter tyres are
used with a maximum speed index below
the one that can be reached by the vehicle
(increased by 5%), place a notice in the pas-
senger compartment, plainly in the driver’s
view which states the maximum permissi-
ble speed of the winter tyres (as per CE Di-
rective).
Fit the same type of tyre on all four wheels
(brand and profile) to ensure higher driving
safety when braking and good handling.
Remember that it is inappropriate to
change the direction of rotation of tyres. WINTER TYRES
These tyres are specially designed for dri-
ving on snow and ice, to be fitted in re-
placement of those fitted on the car.
Use winter tyres of the same size as the
normal tyres provided on the car.
Alfa Romeo Authorised Services will be
pleased to advise you on the choice of the
car most suited to the use the Customer in-
tends to make of it.
For the type of tyre to be used, inflation
pressures and the specifications of winter
tyres, follow the instructions given in the
“Technical Specifications” chapter.
The winter features of these tyres are re-
duced considerably when the tread depth
is below 4 mm. In this case, they should be
replaced.
Due to the winter features, under normal
conditions of use or on long motorway jour-
neys, the performance of these tyres is low-
er than that of normal tyres.
It is necessary therefore to limit their use to
the purposes for which they are certified.
TRAILER TOWING
The car does not have the approval to tow
trailers.