2004 Alfa Romeo 156 ABS

GETTING TO KNOW YOUR CAR
180
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 detects
the rotations of the car around its own ver-
tical axis. The centrifugal forces generated
when the car is cornering are detected by
a highly sensitive lateral acceleration sensor.
The stabilising action of the VDC system is
based on calculations made by the
system’s electronic control unit which
processes the signals received from the
steering wheel rotation, lateral acceleration
and individual wheel rotation sensors. These
signals allow the control unit to recognise
the manoeuvre the driver intends to do
when turning the steering wheel.
The control unit processes the information
received from the sensors and is therefore
capable of detecting the position of the car
and comparing it with the trajectory the dri-
ver would like to follow instant by instant.
In the event of a discrepancy, the control
unit chooses and commands the most suit-
able action to bring the car back to the re-
quired course within a fraction of a second:
braking one or more wheels at a different
braking force and, if necessary it reduces the
power transmitted by the engine. The corrective actions are changed and con-
trolled continuously until the car returns to
the required course.
The action of the VDC system considerably
increases the active safety of the vehicle un-
der many critical situations and it is partic-
ularly useful also when the road surface grip
conditions change.
For the VDC, ASR and ABS
systems to work correctly,
the tyres must be of the same
brand and type on all wheels, in
perfect conditions and above all of
the specified type, brand and size.
WARNING
During use of the compact
spare wheel, the VDC sys-
tem continues working. It should be
borne in mind that the spare wheel
is smaller than a normal tyre,
therefore its grip is lower than that
of the other tyres of the car.
WARNING
VDC SYSTEM OPERATIONThe VDC system turns on automatically
when the car is started and cannot be
switched off. It is however possible to cut
off operation of the ASR system pressing the
corresponding button on the centre console.
The main components of the VDC system
are:
– an electronic control unit which
processes the signals received from the var-
ious sensors and brings about the most ap-
propriate strategy;
– a sensor that detects the position of the
steering wheel;
– four sensors that detect the rotation
speed of each wheel;
– a sensor that detects rotation of the car
around the vertical axis;
– a sensor that detects lateral acceleration
(centrifugal force).

GETTING TO KNOW YOUR CAR
183
SOUND SYSTEM(where applicable)
The fixed sound system, with cassette
player (radio with cassette player) or CD
player with parametric sound equalizer (ra-
dio with CD player) has been designed to
suit the specific characteristics of the pas-
senger compartment, with a personalised
design that matches the style of the dash-
board. The sound system instructions for use
are described in the attached supplement.
SOUND SYSTEM
PRESETTING SYSTEM(for versions/markets where
applicable)
The car, if not delivered with sound sys-
tem, is fitted with a glove compartment
(fig. 172) on the instrument panel.
Sound system presetting system includes
the following:
– sound system power cables;
– front and rear speaker power cables;
– aerial power cable;
– sound system housing;
– aerial on car roof (where provided).The sound system shall be installed in the
proper housing occupied by the glove com-
partment that can be removed by pressing
the two retaining tabs in the glove com-
partment: here are the power cables.
If after buying the car you
want to install the sound
system, contact first Alfa
Romeo Authorised Services whose
qualified personnel, in addition to
suggesting the most suitable de-
vices, will evaluate the overall
electric absorption to safeguard the
battery. Excessive loadless ab-
sorption could damage the battery
and lose warranty.fig. 172
A0B742m

CORRECT USE OF THE CAR
189
PROCEDURE FOR PETROL
ENGINESWARNINGIt is important not to press
the accelerator until the engine has started.
1) Make sure the handbrake is engaged.
2)Move the gear lever to neutral.
3)Fully depress the clutch pedal so that
the starter motor is not forced to crank the
toothed wheels of the gearbox.
4)Ensure that the systems and electrical
devices, especially if they absorb high quan-
tities of energy (e.g. heated rear wind-
screen) are switched off.
5)Turn the ignition to the AV Vposition
and release it as soon as the engine starts.
6)If the engine does not start, return the
key to the STOPposition and repeat the
operation.
WARNINGIf it is difficult to start the en-
gine do not insist with extended attempts
which may damage the catalyzer but con-
tact Alfa Romeo Authorized Services. The ignition switch is fitted with a safety
device which obliges the driver to return the
ignition key to the STOPposition before re-
peating the starting operation if the engine
does not start immediately.
Similarly, when the engine is running, the
device prevents the key being moved from
the MARto the AV Vposition.
STARTING
THE ENGINEWARNINGThe car is fitted with an elec-
tronic engine lock device. If the engine fails
to start see “Alfa Romeo CODE system”.
C C
O O
R R
R R
E E
C C
T T

U U
S S
E E

O O
F F

T T
H H
E E

C C
A A
R R
In addition to the notes
and specifications given be-
low we recommend that,
during the initial period, you do not
drive to full vehicle performance
(for example excessive accelera-
tion, long journeys at top speed,
hard braking, etc.).
To avoid useless con-
sumption of power and
possible draining the bat-
tery, never leave the ignition key
in the MAR position when the en-
gine is not running.
Running the engine in con-
fined areas is extremely
dangerous. The engine consumes
oxygen and produces carbon
monoxide which is a highly toxic
and lethal gas.
WARNING

CORRECT USE OF THE CAR
191
EMERGENCY STARTINGIf the Alfa Romeo CODE system does not
recognise the code transmitted by the igni-
tion key (Alfa Romeo CODE
Y
warning
light on the instrument cluster on glowing
steadily) emergency starting may be carried
out using the code of the CODE card.
For the correct procedure see the chapter
“In an emergency”.
PARKINGWhen the vehicle is parked, proceed as fol-
lows:
– Switch off the engine.
– Engage the handbrake.
– Engage first gear if the car is facing up-
hill or reverse if the car is facing downhill.
– Turn the front wheels so that the car will
immediately come to a half if the handbrake
slips. Starting by pushing, tow-
ing or running downhill
must absolutely be
avoided. These manoeuvres may
cause fuel to flow into the catalyst
and damage it irreparably.
To avoid useless con-
sumption of power and
possible draining the bat-
tery, never leave the ignition key
in the MAR position when the en-
gine is not running.
For vehicles equipped
with turbocharger in par-
ticular and for other vehi-
cles in general, revving the engine
before switching off should be
avoided.
Revving the engine serves no pur-
pose and consumes fuel for no rea-
son. It may also cause damage to
the bearings on the rotor of the
turbocharger.
WARNINGIf the engine turns off with
the car on the move, the next time it is
started, the Alfa Romeo CODE warning lightY
may turn on. In this case, check that
switching off and starting the engine again
with the car stationary, the warning light
stays off. If not, contact Alfa Romeo Au-
thorized Services.
Remember that the servo-
brake and power steering
are not activated until the engine
is started, therefore considerably
greater effort is required on the
brake pedal and steering wheel.
WARNING
Never leave children unat-
tended in the car. Always
remove the key from the ignition
when leaving the car and take it
with you.
WARNING

CORRECT USE OF THE CAR
195
DRIVING ON SNOW AND ICEHere are few suggestions for driving in
these conditions:
– Keep your speed down.
– On a snowy road, fit winter tyres or
snow chains; see the related paragraphs in
this section.
– Use exhaust brake where possible and
avoid abrupt braking.
– Avoid abrupt acceleration and changes
of direction.
– During cold weather even apparently dry
roads may be covered with occasional
patches of ice. Pay great attention therefore
when driving on roads which are in the
shade, or where rocks or trees line the road
and on which ice may persist.
– Keep further back from the vehicle in
front.
DRIVING WITH ABSThe ABS is a part of the braking system
which essentially offers two advantages:
1)It prevents wheel lock-up and conse-
quent skidding in emergency stops, partic-
ularly when the road does not offer much
grip;
2)It makes it possible to brake and steer
at the same time so you can avoid unex-
pected obstacles and direct the car where
you want while braking. The extent to which
this can be done will depend on the physi-
cal limits of the tyre’s sideways grip.
To make the most of the ABS:
– In emergency braking or when grip is
low, a slight pulsing can be felt on the brake
pedal: this means that the ABS has come
into action. Do not release the pedal, but
continue pressing it to give continuity to the
braking action.
– The ABS prevents the wheels from lock-
ing but it does not increase the physical lim-
its of grip between the asphalt and the road.
Therefore, also with a car fitted with ABS,
keep within a safety distance from the ve-
hicle in front and limit speed when ap-
proaching bends.
The ABS serves to increase car controlla-
bilty not to go faster.
REDUCING RUNNING
COSTS AND
ENVIRONMENT
POLLUTIONSome suggestions which may help you to
keep the running costs of your vehicle down
and lower the amount of toxic emissions re-
leased into the atmosphere are given below.GENERAL CONSIDERATIONSVehicle maintenance
The overalll state of the vehicle is an im-
portant factor which has a marked influence
over fuel consumption and driving comfort
and on the life span of your vehicle. For this
reason care should be taken to maintain
your vehicle by carrying out the necessary
checks and regulations in accordance with
specifications given in the “Scheduled Main-
tenance Programme” (see sections... spark
plugs, air cleaner, timing).

CORRECT USE OF THE CAR
199
TOWING TRAILERSWARNINGS AND
SUGGESTIONS For towing caravans or trailers the vehi-
cle must be fitted with a certified tow hook
and an adequate electric system. Installa-
tion should be carried out by specialised per-
sonnel who release a special document for
circulation on the road.
Install any specific and/or additional rear-
view mirrors as specified by law. Remember
that when towing a trailer, steep hills are
harder to climb, the braking spaces increase
and overtaking takes longer depending on
the overall weight.
Engage a low gear when driving downhill,
rather than constantly using the brake.
The weight the trailer exerts on the vehi-
cle tow hook reduces by the same amount
the actual vehicle loading capacity. To make sure the maximum towable
weight is not exceeded (given in the log
book) account should be taken of the fully
laden trailer, including accessories and per-
sonal belongings.
Drive within the permitted speed limits for
vehicles with trailers. In any case the maxi-
mum speed should never exceed 100 km/h.
INSTALLING THE TOW HOOKThe towing device should be fastened to
the body by specialised personnel according
to the following instructions and any addi-
tional and/or integrative information sup-
plied by the Manufacturer of the device.
The towing device must meet current reg-
ulations with reference to 94/20/EC Di-
rective and subsequent amendments.
For any version the towing device used
must match the towable weight of the ve-
hicle on which it is to be installed.
For the electric connection a unified con-
nector should be used which is generally
placed on a special bracket normally fas-
tened to the towing device.
The ABS system with
which the car may be fitted
does not control the trailer braking
system. Particular care is therefore
necessary on slippery surfaces.
WARNING
Under no circumstances
should the vehicle brake
system be altered to control the
trailer brake. The trailer braking
system must be fully independent
of the vehicle’s hydraulic system.
WARNING

IN AN EMERGENCY
209
CHANGING A WHEEL(optional for versions/markets
where applicable)
You are informed that:
– The jack mass is 2,100 kg.
– The jack requires no adjustment.
– The jack cannot be repaired, in the event
of breakage it must be replaced by anoth-
er original one.
– No tools other than its operating crank
can be fitted to the jack.
To change the wheel proceed as follows:
– Stop the car in such a position that it is
not dangerous for the traffic, where it is pos-
sible to change the wheel safely. Where pos-
sible, park on a level, compact surface.– Stop the engine and engage the hand-
brake.
– Engage first gear or reverse.
– Lift the boot carpet and hook it as shown
in (fig. 1a).
– Loosen the clamping device (handle)
(A-fig. 2).
fig. 2
A0B0234m
fig. 1a
A0B0577m
Snow chains cannot be fit-
ted to the compact spare
wheel, so, if a front wheel is punc-
tured and chains need to be used,
the front axle should be fitted with
normal wheels and the spare
wheel fitted to the rear. In this
way, as two normal tyres are fit-
ted to the front of the vehicle,
snow chains can be mounted,
thereby overcoming an emergency.
Absolutely never tamper with the
inflation valve.
Do not insert tools of any kind be-
tween the rim and the tyre.
Routinely check that the pressure
of the tyres and of the compact
spare wheel is as specified in the
“Technical specifications” chapter.
WARNING

IN AN EMERGENCY
216
Drive carefully to the nearest Alfa Romeo
Authorized Service to check the tyre condi-
tions, then have it fixed or replaced.
It is absolutely necessary to communicate
that the tyre has been fixed with the quick
repairing kit.
fig. 18
A0B0339m
fig. 19
A0B0391m
fig. 17
A0B0338m
If, during the pressure
restoring operation, it is
not possible to reach at least 1,8
bars, do not drive any further be-
cause the tyre is too much dam-
aged and the quick repairing kit
cannot guarantee proper hold. Con-
tact Alfa Romeo Authorized Ser-
vices.
WARNING
Tyres fixed with the quick
repairing kit must be used
only temporarily.
WARNING