2011 Alfa Romeo 147 sensor

GETTING TO KNOW YOUR CAR
137
The stabilising action of the VDC system is
based on the calculations of the system elec-
tronic control unit, which processes the sig-
nals received from the steering wheel rota-
tion sensor, acceleration sensor and rotation
speed sensor of ech wheel.These signals al-
low the control unit to recognise the ma-
noeuvre the driver intends to do when the
steering wheel is turned.
The control unit processes the information
received from the sensors and therefore able
to know the position of the car instant by in-
stant and compare it with the course the dri-
ver would like to follow. In the event of a
discrepancy, in a fraction of a second the
control unit chooses and commands the
most suitable intervention to bring the car
immediately back to the required course:
braking one or more wheels at different in-
tensity and, if necessary, reducing the pow-
er transmitted by the engine.
The corrective actions are modified and
controlled continuously in seeking the course
required by the driver.
The action of the VDC system considerably
enhances the active safety of the car in very
critical situations and it is particularly help-
ful when the grip conditions of the road sur-
face change.CUTTING IN
OF THE VDC SYSTEM
The cutting in of the VDC system is indi-
cated by the flashing of the
áwarning light
on the instrument cluster, to inform the dri-
ver that the car is in critical conditions of sta-
bility and grip.
VDC system failure warning
In the event of a failure the VDC system
disengages automatically and the
áwarn-
ing light on the instrument cluster turns on
glowing steadily, together with the message
on the reconfigurable multifunction display.
In the event of a VDC system failure the
car behaves like a vehicle not fitted with this
system: in any case it is advisable to con-
tact Alfa Romeo Authorised Services as soon
as possible.
For the VDC system to
work correctly, the tyres
must be of the same brand and
type on all wheels, in perfect con-
ditions and above all of the speci-
fied type, brand and size.
WARNING

GETTING TO KNOW YOUR CAR
174
EMISSION REDUCING DEVICES
Trivalent catalytic converter
(catalytic silencer)
The exhaust system is fitted with a cata-
lyst formed of alloys of precious metals; it
is housed in a stainless steel container which
is able to withstand the high operating tem-
peratures.
The catalyst converts the unburnt hydro-
carbons, carbon monoxide and nitric oxide
in the exhaust gas (even in minimal quan-
tity owing to the electronic ignition and in-
jection systems) into non polluting com-
pounds.Lambda sensors
Lambda sensors measure the content of
oxygen present in the exhaust gas. The sig-
nal transmitted by the Lambda sensors is
used by the injection and ignition electron-
ic control unit to adjust the air - fuel mixture.
Anti-evaporation system
As it is impossible, even when the engine
is switched off, to prevent the formation of
fuel vapours, a system has been devised
which traps the vapours in a special acti-
vated carbon container.
When the engine is running these vapours
are withdrawn and sent to combustion.
ENVIRONMENTAL
PROTECTION
The design and construction of the vehi-
cle have not only been developed with the
traditional aspects of performance and safe-
ty in mind, but also take into account the in-
creasingly pressing problems tied to pro-
tecting the environment.
The choice of materials, techniques and
particular parts are the result of work which
has made it possible to drastically reduce
the harmful effects on the environment and
guarantee compliance with the most strin-
gent international regulations.
USE OF NON-TOXIC
MATERIALS
None of the components of the vehicle con-
tain asbestos. The padding and the climate
control system do not contain CFCs which
are held responsible for the destruction of
the ozone layer.
The colouring agents and the corrosion in-
hibitors used on the nuts, screws and bolts
do not contain cadmium or chrome which
could pollute the atmosphere or water tables.
Due to the high tempera-
tures reached during oper-
ation of the catalytic silencer the
vehicle should not be parked over
inflammable materials (paper, fu-
el oils, grass, dry leaves etc.).
WARNING

CORRECT USE OF THE CAR
184
PROTECTING EMISSION
REDUCING DEVICES
Correct operation of the anti-pollution de-
vices not only guarantees respect for the en-
vironment but also influences vehicle per-
formance. Keeping these devices in good
condition is therefore the first rule for both
environment-friendly and economy driving.
The first precaution is to closely follow the
“Programmed Maintenance Schedule”. Use
only unleaded petrol (95 RON) (Specifica-
tion EN228).
If difficulty with starting is experienced do
not insist with extended attempts. Especially
avoid bump, tow or coast starts: these may
all damage the catalyst. Only use an auxil-
iary battery to start the car in an emergency.If when driving the engine is not running
smoothly, continue, minimising the need for
engine performance and contact Alfa Romeo
Authorised Services as soon as possible.
When the fuel reserve warning light turns
on, fill up as soon as possible. A low fuel lev-
el may cause an irregular supply to the en-
gine with inevitable increase of the exhaust
gas temperature; this would result in serious
damage to the catalyst.
Never run the engine, even as a test, with
one or more spark plugs disconnected. Do
not warm the engine at idle speed before
moving off, unless the outside temperature
is very low and, in this case too, for no more
than 30 seconds.
Do not spray anything on
the catalyst, lamda sensor
and exhaust pipe.
WARNING
The failure to follow these
rules may cause a fire
hazard.
WARNING
Do not install other heat
guards and do not remove
the existing ones on the catalyst
and exhaust pipe.
WARNING
During normal service the
catalyst reaches high tem-
peratures. Do not therefore park
the car over inflammable materials
(grass, dry leaves, pine needles,
etc.): fire hazard.
WARNING

IN AN EMERGENCY
214
Volumetric sensors
VDC system sensor
Steering angle sensor
EOBD system diagnosis socket
Cell phone provision
Driver’s door control unit supply
Passenger’s door control unit supply
Controls lighting
Climate control system controls lighting
Instrument cluster
Instrument cluster
Driver’s door control unit
ABS control unit
ABS control unit
Dashboard control box
Boot control unit
Air - bag control unit
Electronic injection control unit +30
Dashboard control unit15
7.5
7.5
15
15
20
20
7.5
7.5
10
10
15
7.5
50
50
15
7.5
7.5
70 F39
F42
F42
F39
F39
F47
F48
F49
F35
F37
F53
F39
F42
ABS (MAXI-FUSE)
CPL2 (MAXI-FUSE)
F39
F50
F6
CPL1 (MAXI-FUSE) 52
52
52
52
52
52
52
52
52
52
52
52
52
54
54
52
52
53
54
SERVICES FIGURE FUSE AMPERES

VEHICLE MAINTENANCE
232
AIR CLEANER
The air cleaner is connected to the tem-
perature and air flow sensors which send
to the control unit the electric signals need-
ed for correct operation of the injection and
ignition system.
It must therefore always be in perfect con-
ditions, to ensure correct operation of the
engine, low consumption and exhaust emis-
sion levels.
If the operations concern-
ing cleaner replacement
are not carried out correct-
ly and with the due precautions,
they may compromise the travel-
ling safety of the vehicle. You are
recommended to have this opera-
tion carried out by Alfa Romeo Au-
thorised Services.
Any attempt to clean the
cleaner may damage it,
leading to serious engine
damage.If the car is habitually
used in dusty areas, the
cleaner should be replaced
at shorter intervals than those
specified in the Programmed Main-
tenance Schedule.
POLLEN FILTER
This has a mechanical/electrostatic air fil-
tering action, provided that the windows and
doors are shut.
Have the dust/pollen filter checked once
a year by Alfa Romeo Authorised Services,
preferably at the onset of summer.
If the car is mainly used in dusty or heav-
ily polluted areas, the filter should be
changed at more frequent intervals than
specified in the Scheduled Maintenance Pro-
gramme.
IMPORTANTThe failure to replace the
pollen filter can considerably reduce the ef-
fectiveness of the climate control system.

TECHNICAL SPECIFICATIONS
247
SPARK PLUGS
Clean, intact spark plugs are determinant
with regard to engine efficiency and for re-
ducing the emission of pollutants.Spark plugs should be re-
placed at the intervals
specified in the Scheduled
maintenance programme. Only use
spark plugs of the specified type:
if the thermal capacity is inade-
quate or if the envisaged life is not
guaranteed inconveniences may en-
sue.
BRAKES
Service brakes: – front
– rear
Parking brake
If examined by an expert eye, the ap-
pearance of a spark plug is a sound clue
for locating a fault, even if not involving the
ignition system. Therefore if you are expe-
riencing any engine problems, it is impor-
tant to have the spark plugs checked by Al-
fa Romeo Authorized Services.
STEERING
Type
Turning radius (between pavements)
3.2 V6 24V - 3.2 V6 24V Selespeed
Disk self-ventilated
Disk
3.2 V6 24V 3.2 V6 24V Selespeed
Rack and pinion.
Hydraulic power steering with fluid reservoir in engine compartment
12.1 m 12.1 m Wheel anti-look system (ABS) with electronic braking distribution.
Servo-brake. Electronic control with brake pad wear sensors. Gaskets of ecological type.
Controlled by hand lever operating rear brakes.

RIGHT HAND DRIVE VERSION
260
DASHBOARD
1. Side swivel air vents - 2. Fixed side window air vents - 3. Passenger’s front Air bag - 4. Tailgate release button - 5. Card holder - 6. Radio -
7. Centre swivel air vents - 8. Fixed upper vent - 9. Glass holder - 10. Fog lamp button - 11. Hazard warning light switch - 12. Rear fog guard
button - 13. Outer light control lever - 14. Speedometer with mileage recorder and trip recorder and headlamp aiming display - 15. Fuel level
gauge with reserve warning light - 16. Multifunction display - 17. Engine coolant fluid temperature gauge - 18. Rev counter - 19. Wind-
screen/rearscreen wiper control lever - 20. Bonnet opening lever - 21. Set of controls: trip meter reset, headlamp aiming device, trip comput-
er - 22. Ignition key and switch - 23. Horn - 24. Steering wheel locking/release lever - 25. Driver’s front Air bag - 26. Door locking button -
27. Controls for heating, ventilation and climate control - 28. Ashtray - 29. Cigar lighter - 30. Temperature sensor - 31Glovebox.
fig. 1A0A0475m

ALPHABETICAL INDEX
279
Maintenance
- additional operations ................ 224
- annual inspection programme .... 224
- checking levels ........................ 226
- precautions and warnings.......... 225
- scheduled maintenance ............ 221
- scheduled maintenance
programme............................. 222
Mechanical gearbox
- lever ...................................... 109
Number plate lights
- changing bulbs ........................ 205
Paintwork (maintenance) ............ 241
- colour label ............................. 244
Parking....................................... 177
Performance................................ 251
Pockets on doors.......................... 124
Pollen filter ................................ 232
Power steering oil- checking level and topping up.... 229
Power windows ........................... 24
Pretensioners............................... 28
Radio transmitters
and cell phones ......................... 126
Radio
- presetting system ................... 140
Radio with CD player .................... 141
- advice .................................... 141
- aerial ..................................... 171
- antitheft protection .................. 144
- cautions ................................. 144
- CD changer ............................. 168
- CD player section ..................... 165
- controls at steering wheel ......... 149
- controls on front panel.............. 148
- functions and adjustments......... 150
- general .................................. 143
- glossary ................................. 145- protection fuse ........................ 171
- radio section ........................... 153
- speakers ................................ 171
- telephone provision .................. 153
Rain sensor ................................. 45
Raising the car
- with arm lift or workshop
lift ......................................... 220
Rear ceiling light .......................... 121
- changing bulbs ........................ 207
Rear fog guards
- changing bulbs ........................ 203
- switching on ........................... 107
Rear oddment pockets .................. 124
Rearscreen heating ....................... 105
Rearscreen washer ....................... 46
- spray jet ................................. 239
Rearscreen wiper
- blade replacement ................... 239