2007 Alfa Romeo 156 engine

GETTING TO KNOW YOUR CAR
149
When shifting gear, releasing the acceler-
ator pedal is not necessary because the Se-
lespeed system directly controls the engine
so as to:
– reduce and then increase the engine
torque;
– adapt the engine speed to the new gear
ratio engaged.
When downshifting, double de-clutching
(acceleration of the engine to bring it to the
speed necessary with the new gear ratio) is
carried out automatically.
The move to neutral (N) command is ac-
cepted when the car speed exceeds 20 km/h.
The command to engage reverse gear (R)
is accepted only if the car is stationary.With the accelerator pedal pressed by over
60% of its stroke and with an engine speed
of over 5,000 rpm, gearshifting becomes
quicker.
In the MANUALmode there are some
automatic/safety devices which make dri-
ving easier:
– when slowing down, the clutch is
opened and the gear ratio is reduced auto-
matically to be ready for possibly picking up
speed again; if not, stopping the vehicle,
first gear (1) will be engaged automatically;
– request to change gear that could take
the engine above the maximum rpm or be-
low the minimum permissible rpm are not
accepted;– if the engine reaches the maximum per-
missible rpm and accelerating continues
(without coming into operation of the VDC
system), the system automatically engages
a higher gear; with the activation of the VDC
system, with the maximum engine rpm,
gear shifting is excluded;
– if sticking occurs during the engagement
of a gear, the system firstly tries to engage
the required gear again and, if it is still not
possible, it automatically engages the im-
mediately higher one to avoid leaving the
vehicle in neutral speed.
WARNINGIt is advisable to wait for a
gearshift to end before requesting another
one, this will avoid multiple requests in quick
succession.

GETTING TO KNOW YOUR CAR
150
AUTOMATIC OPERATION (CITY)The CITYautomatic operating mode is se-
lected pressing the button (A-fig. 132),
at the base of the gearshift lever.
In addition to the gear, the display on the
rev counter will show the word CITY.
The system decides directly when gearshift-
ing according to the engine running speed
and the driving style.
Quickly releasing the accelerator pedal, the
system does not engage a higher gear in or-
der to maintain an adequate level of engine
brake.
FAILURE SIGNALLINGFailures to the Selespeed gearbox are in-
dicated by the
t
(A-fig. 133) warn-
ing light on the instrument cluster.
When the system is turned on (turning the
ignition key to MAR), the warning light
should turn on glowing steadily for about
4 seconds and then turn off.
If the warning light stays on it means that
a fault to the gearbox has been detected; at
the same time a buzzer sounds intermit-
tently for 4 seconds to attract the driver's
attention.In the case of a fault to the gearshift lever,
the system automatically activates the au-
tomatic CITYmode to allow the car to
reach the nearest Authorized Alfa Romeo
Services to have the fault detected elimi-
nated.
In the event of faults to other components
of the gearbox, the system only allows the
engagement of certain ratios: first gear (1),
second (2) and reverse (R).
fig. 132
A0B0269m
fig. 133
A0B0383m
If the warning light
t
comes on, contact the Alfa
Romeo Authorized Services
as soon as possible to remove the
fault.In case of transmission
fault, contact the Alfa
Romeo Authorized Services as
soon as possible to check the sys-
tem.
WARNING

GETTING TO KNOW YOUR CAR
151
SIGNALLING WITH THE BUZZERThe buzzer is activated when:
– reverse gear (R) is engaged;
– the vehicle is parked with the gearbox
at neutral (N); this can be seen turning the
ignition key to STOP;
– clutch overheating takes place during
pick-up;
– the car moves in the opposite direction
to the gear engaged (e.g.: the car tends to
do downhill with reverse gear engaged);
– in the event of gearbox failure;
– the system has automatically engaged
neutral (N) after:•
there is no action on the accelerator
and/or brake pedal for at least 3 min-
utes;
•
the brake pedal is pressed for over 10
minutes;
•
the driver’s door is opened and the ac-
celerator and brake pedal are not
pressed for at least 1 second;
•
detection of a gearbox fault.
PARKING THE VEHICLETo park the car safely it is absolutely
necessaryto engage first gear (1) or re-
verse (R) and, when on a sloping road, also
engage the hand-brake.
Turning the engine off with the car facing
uphill and a gear engaged, it is absolutely
necessaryto wait for the display on the
rev counter to go off before releasing the
brake pedal, so that the clutch has innested
completely.
If the gearbox is in neutral (N) and you
want to engage a parking gear, it is neces-
sary to activate the system and engage the
gear (1) or reverse (R) with your foot on
the brake pedal.
TOWING THE VEHICLEWARNINGFor towing the vehicle, ad-
here to local regulations. Make sure that the
gearbox is in neutral (N) (checking that the
car moves when pushed) and proceed as for
towing a normal car with mechanical gear-
box following the instructions given in the
chapter “In an emergency”.
Should it be impossible to set to neutral,
do not tow the vehicle; contact Alfa Romeo
Authorised Services.
Do not start the engine
when towing the vehicle.
WARNING

GETTING TO KNOW YOUR CAR
152
Q-SYSTEM
AUTOMATIC GEARBOX(optional for versions/markets
where applicable)
The 2.5 V6 24V engine can be supplied
with an automatic gearbox which in addi-
tion to the normal functions, makes it pos-
sible to shift gear by hand moving the se-
lector lever to the special sector, Q-System
device.
WARNINGTo be able to use the auto-
matic gearbox correctly, the description given
in this chapter should be read thoroughly
in order to learn the correct, allowed oper-
ations also in concerning the Shift-lock and
Key-lock safety devices with which the gear-
box is fitted right from the start.
STARTING THE ENGINEThe engine can only be started with the
gearshift lever (fig. 134) in position P
or N.
For safety reasons, you are advised to start
the engine with the brake pedal pressed.
WARNINGWhen moving off, after hav-
ing started the engine, do not press the ac-
celerator pedal before and while moving the
gearshift lever. This is particularly important
when the engine is cold.
MOVING OFFAfter starting, with the engine idling and
keeping the brake pedal pressed (Shift-lock
safety device), move the gearshift lever
(fig. 134) to position D, or to the man-
ual position. Release the brake pedal and
gradually press the accelerator pedal.
WARNINGMoving the lever from posi-
tion P, with the ignition key at MAR, is
only allowed with the brake pedal pressed
(Shift-lock safety device).
To move the lever, raise the ring (A-
fig. 134) under the gearshift lever knob.
fig. 134
A0B0268m

GETTING TO KNOW YOUR CAR
153
In an emergency (failures, flat battery,
etc.), it is possible to move the lever from
position P, pressing the special mechanical
button under the gearshift lever cover, in the
area (A-fig. 135); at the same time
move the lever from position Pto the re-
quired position. If the engine is being
started, move the lever to position N, which
is the only one that allows this operation
in this case.
WARNINGThe ignition key in the
STOPposition can only be removed from
the ignition switch provided that the
gearshift lever is at P(Key-lock).In an emergency (failures, flat battery,
etc.), it is possible to remove the ignition
key also with the selector lever not posi-
tioned at P.
Press the release device (A-fig. 136),
next to the ignition switch inside the trim,
with your finger removing the key at the
same time.
Do not take the car to peak performance
until the engine has reached normal oper-
ating temperature.fig. 135
A0B0267m
fig. 136
A0B0266m
fig. 137
A0B0385m
SELECTING AUTOMATIC/
MANUAL GEARSHIFTINGThe main feature of this gearbox is the pos-
sibility of using it either automatically or
manually. The choice of the operating mode
is carried out positioning the gearshift lever
in the right sector (automatic gearshifting)
or in the left sector (manual gearshifting).
The gearbox operating mode and the gear
engaged are shown on the display inside the
rev counter (A-fig. 137).

GETTING TO KNOW YOUR CAR
154
R - Reverse
Move the gearshift lever to Rwith the car
stationary, the engine idling and the brake
pedal pressed.
To prevent accidental engagements, mov-
ing the lever to this position is only allowed
raising the ring (A-fig. 138) placed un-
der the gearshift lever knob.
With the lever in position R the reversing
lights turn on and a beep is sounded for
safety reasons to indicate that reverse gear
has been engaged.
Before moving the lever, press the brake
pedal: the car must be stationary.
WARNINGWith the lever in position R,
reverse gear is not engaged if the vehicle
speed is above the established level. When
the car speed falls below this level, reverse
gear is engaged and remains engaged even
if the speed returns above the limit.
AUTOMATIC OPERATIONSelector lever
For automatic gearshifting, move the
gearshift lever to the right sector
(fig. 138) in one of the following posi-
tions:
P- park (the engine can be started)
R- reverse
N- neutral (the engine can be started)
D- automatic forward gear.
Raise the ring (A-fig. 138) placed un-
der the gearshift lever knob for shifting:
– from Pto Rand vice versa
– from Nto R.P - Park
To prevent accidental engagements, mov-
ing the lever to position Pis only allowed
raising the ring (A-fig. 138) placed un-
der the gearshift lever knob.
When the car is being parked, move the
lever to this position. A device in the gear-
box will lock the driving wheels.fig. 138
A0B0265m
Always pull the hand-
brake completely before
leaving the car.
Move the gearshift lever to posi-
tion P when getting out of the car
leaving the engine running.
WARNING

GETTING TO KNOW YOUR CAR
155
N - Neutral
This is the neutral position to be used when
the car has to be pushed or towed.D - Automatic forward gear
This is the position to be used always un-
der “normal” driving conditions, for exam-
ple on the motorway and urban roads and
when wanting to minimise fuel consumption
(combined with the CITYdriving mode).
When the lever is in this position, the gear-
box automatically selects the four available
speeds. It is also the position to be used
for the ICEdriving mode.Shifting to lower gear
(Kick down)
In the event of the need to accelerate
heavily (e.g. for overtaking) pressing the
accelerator fully home beyond the stiff point
will cause automatic kick down to a shorter
ratio, engine speed conditions permitting.
Releasing the accelerator pedal as soon as
the stiff point has been passed, the gearbox
shifts to the optimum ratio in relation to the
driving mode, throttle opening position and
selector lever position.
The Kick-down function is advised only for
overtaking or fast accelerating to avoid in-
creasing fuel consumption.
Kick-down is cut off automatically in the
ICEdriving mode.
With the engine idling,
when moving the lever to
position N the car tends to move
even if it is on level ground: keep
the brake pedal pressed when the
lever is in position N.
WARNING
With the engine idling and
the lever in position D the
vehicle tends to move: always
keep the brake pedal pressed un-
til moving off.
WARNING

GETTING TO KNOW YOUR CAR
156
SPORT(button (A-fig. 139)
pressed):
This is selected when wanting to avail of
the vehicle’s peak performance for sporty
driving or on demanding routes.
Driving in the SPORTmode increases fuel
consumption.
WARNINGThe CITYor SPORTdri-
ving modes can be selected under any con-
dition (vehicle stationary or on the move).
WARNINGWhen the car is started with
a cold engine, the system selects the
SPORTdriving mode, even if the CITY
mode has been selected, until the engine
reaches normal operating temperature.
C/S
ICE( button (B-fig. 133) pressed):
This driving mode is recommended when
the road surface offers poor grip (snow, ice,
etc.). Moving off takes place in 2
ndgear.
The ICEdriving mode is available only with
the selector lever at D.
Moving the lever from D, the ICEmode
is automatically cut off.
WARNINGThe ICEdriving mode can
be engaged pressing the corresponding but-
ton also with the car on the move, provided
that the speed is below 45 km/h.
ICE
SELECTING THE DRIVING
MODESThe automatic gearbox for this car is con-
trolled electronically and includes the selec-
tion of three different driving modes, thereby
giving the best response in terms of driving
comfort, consumption levels, sporty perfor-
mance and travelling safety.
The three driving modes CITY, SPORT
and are selected by 2 buttons on the
centre console (fig. 139).
The button (A-fig. 139) selects the
CITYor SPORTfunctions, the button
(B-fig. 139) selects the mode.
With the ignition key at MAR, the driving
mode selected is indicated by the lighting
up of the corresponding word on the display
on the instrument cluster (rev counter):
CITY( button (A-fig. 139)
pressed):
This is used under normal operating con-
ditions; it gives preference to comfortable
driving and balanced consumption control
engaging gears at relatively low engine
speed.
C/S
ICE
ICE
C/SICE
fig. 139
A0B0264m