2006 Alfa Romeo 156 check engine

GETTING TO KNOW YOUR CAR98
Warning lightMessage
on displayU
ENGINE CONTROL SYSTEM (EOBD) FAILUREIn normal conditions, turning the ignition key to MAR, the dial warning light turns on but it should
go off when the engine has started. The initial turning on indicates that the warning light is work-
ing properly.
If the warning light stays on or turns on (together with the message + symbol shown on the dis-
play) when travelling:
glowing steadily- indicates a fault in the supply/ignition/injection system which could cause
high exhaust emissions, possible lack of performance, poor handling and high consumption levels.
In these conditions, it is possible to continue driving without however demanding heavy effort or
high speeds. Prolonged use of the car with the warning light on may cause damage. Contact an
Alfa Romeo Authorized Service as soon as possible.
The warning light turns off if the fault disappears, but it is still stored by the system;
flashing- indicates that the catalyst could be damaged (see paragraph on “EOBD system” in this
chapter).
If the warning light flashes, it is necessary to release the accelerator pedal to lower the speed un-
til the warning light stops flashing; continue travelling at moderate speed trying to avoid driving
conditions that could cause the warning light to flash again. Contact an Alfa Romeo Authorized Ser-
vice as soon as possible.
If, when turning the ignition key to MAR, the warning light
U
does
not switch on or if it turns on glowing steadily or flashing when trav-
elling, contact Alfa Romeo Authorized Service as soon as possible. The
operation of the warning light
U
can be checked by traffic agents by proper
equipment, therefore comply with the regulations in force in the country where
you are driving.

GETTING TO KNOW YOUR CAR99
Warning light Message
on displayY
ALFA ROMEO CODE SYSTEMWhen the ignition key is turned to MAR, the warning light on the check panel should flash only
once and then go out. If the warning light stays on with the key at MAR, this indicates a possible
failure: see “Alfa Romeo CODE System”.
WARNINGThe turning on at the same time of
U
and
Y
warning lights indicates a failure of
the Alfa Romeo CODE System.
If with the engine running, the
Y
warning light flashes, this means that the car is not protected
by the engine inhibitor device (see “Alfa Romeo CODE system” in this chapter). Contact Alfa Romeo
Authorized Services to have all the keys memorised.
POSSIBLE PRESENCE OF ICE ON THE ROADWhen the outside temperature is below or equal to 3° C, in order to warn the driver on the pres-
ence of ice on the road, message + symbol are displayed accompanied by the related buzz.
The buzz lasts about 2 seconds while the message is displayed for about 10 seconds. After this
period, only the symbol is displayed until the temperature does not go over 6° C or until the en-
gine stops.
If during travelling, after the presence of ice on the road has been signalled, should temperature
rise over 6° C the symbol will go off and should temperature fall again to 3° C, a new message +
symbol will be displayed accompanied by the buzz.

GETTING TO KNOW YOUR CAR
102
Warning light Message
on display>
INEFFICIENT ABS SYSTEMWhen the ignition key is turned to MAR, the warning light comes on but must go out after a
few seconds.
This warning light comes on (together with the message + symbol, where required, on the display)
when the system is inefficient. In this case, normal braking is ensured, though without making use
of the ABS system. Caution is recommended, especially in cases of less than perfect grip. In any
case, contact Alfa Romeo Authorized Services as soon as possible.Inefficient EBD electronic braking distributor
x>+
The vehicle is equipped with an electronic braking distributor (EBD). Si-
multaneous lighting of dial warning lights
>
and
x
(together with the
message + symbol on the display) with the engine running indicates an EBD
system failure; in this case, any sudden braking action can cause early locking
of rear wheels, with possible sideslip. Drive very carefully and go immediately
to the nearest Alfa Romeo Authorized Service to have the system checked.
WARNING

GETTING TO KNOW YOUR CAR
106
l
DIRECTION INDICATORS IF A TRAILER IS TOWEDThe warning light on the dial comes on when the direction indicator control lever is moved up or
down, or when the hazard warning light button is pressed.
Warning light Message
on display1
MAIN-BEAM HEADLIGHTSThe warning light comes on when these lights are turned on.
3Ü
SIDELIGHTS AND DIPPED-BEAM HEADLIGHTSThe warning light on the dial comes on when the sidelights or dipped-beam headlights are
switched on.CONSTANT SPEED ADJUSTMENT (CRUISE CONTROL)
(where applicable)The warning light on the check panel turns on, with the knurled ring of the cruise control in the
ON position, when the device starts to intervene on the engine.

GETTING TO KNOW YOUR CAR
114
Cooling adjustment
Proceed as follows:
– turn off inside air re-circulation (if on);
– turn knob (1) counterclockwise to re-
duce temperature;
– turn knob (4) counterclockwise to re-
duce the fan speed.
LOOKING AFTER THE SYSTEMDuring the winter the climate control sys-
tem must be turned on at least once a
month for about minutes.
Before summer, have the system checked
at Alfa Romeo Authorized Service.
AUTOMATIC
TWO-ZONE CLIMATE
CONTROL SYSTEMTo start the system (fig. 100):
– turn the knob rings to set the required
temperatures (driver’s side – passenger’s
side).
– press the
AUTO
button.
WARNINGThe climate control system
makes it possible to adjust the temperatures
required for the two sides with a maximum
difference of 7°C between the driver’s and
the passenger’s sides.
WARNINGThe climate control com-
pressor works only when the engine is run-
ning and the outside temperature is more
than 2°C.

GETTING TO KNOW YOUR CAR
134
This function is timed and switches off au-
tomatically after 20 minutes, or pressing the
button again; the function is also switched
off when the engine is stopped and will not
be switched on again the next time the en-
gine is started.
WARNINGThe system turns on
rearscreen heating automatically if the tem-
perature is below 3°C.
WARNINGDo not apply stickers on the
inside of the rearscreen over the heating fil-
aments to avoid damage that might cause
it to stop working properly.
WARNINGWhen reconnecting the neg-
ative battery cable after having disconnected
it, wait for 2 minutes before turning the key
to enable the climate control system to re-
set actuator strokes properly.
POLLEN FILTER This filter has the specific capability of com-
bining the mechanical filtering of the air with
an electrostatic effect so that the outside air
admitted to the passenger compartment is
purified and free from particles such as dust,
pollen, etc.
In addition to the above, it also effectively
reduces the concentration of pollutants.
The filtering action takes place under all
air inlet conditions and it is clearly most ef-
fective with the windows shut.
Have the conditions of the filter checked by
Alfa Romeo Authorized Services at least once
a year, preferably on the onset of summer.If the vehicle is used mainly in polluted
or dusty areas it should be checked and if
necessary replaced, at shorter intervals.
Failure to replace the fil-
ter may considerably re-
duce the effectiveness of
the climate control system up to
blocking the air flow from the out-
lets and vents.

GETTING TO KNOW YOUR CAR
143
SYSTEM ACTIVATIONWARNINGOpening the driver’s door,
the Selespeed starts the hydraulic part of
the system to prepare it for the engine to be
started. This function (noted by the turning
of the electric pump) is deactivated after 10
openings/closings of the door that are not
followed by actual system activation using
the ignition key.
Turning the ignition key to MAR, all the
segments of the display (A-fig. 126), the
gearbox failure warning light (B-fig. 126)
and the word CITYlight up. After about one
second, the display indicates the gear en-
gaged (N, 1, 2, 3, 4, 5, R); from this mo-
ment, the Selespeed system accepts
gearshift commands.
WARNINGIf after 10 seconds the dis-
play segment do not display the gear en-
gaged or the failure warning light stays on,
turn the ignition key to STOPand wait for
the display to go off, then repeat the sys-
tem activation procedure. If the fault per-
sists, contact Alfa Romeo Authorized Ser-
vices
OPERATION WITH THE
ENGINE OFFWARNINGBefore operating the gear-
shift control lever, always check the gear en-
gaged on the display (N, 1, 2, 3, 4, 5, R).
When the engine is off and the vehicle is
stationary, it is possible to engage all the
gears.
With the vehicle stationary and with the
brake pedal pressed, requests to shift gear
are accepted onlyif they are carried out
through the control lever on the central con-
sole.To request gearshifting, in addition to keep-
ing the brake pedal pressed it is necessary to:
– to increase gear (+) (fig. 127) push
the lever “forwards” (if the car is in first gear
this shifts to second, if it is in second gear
it goes to third and so on up to fifth). If the
system is in neutral (N) or reverse (R) the
forward movement on the lever causes en-
gagement of first gear (1).
– to shift down (–) (fig. 127) push the
lever backwards (if the car is in fifth gear
it moves to fourth, if fourth gear is engaged
it shifts to third and so on down to first).
fig. 127
A0B0272m

GETTING TO KNOW YOUR CAR
146
WARNINGS– With the vehicle stationary and a gear
engaged, always keep the brake pedal
pressed until you decide to move off;
– in prolonged stops with the engine run-
ning it is advisable to keep the gearbox is
neutral;
– when the car is parked on a slope, do
not use the pick-up manoeuvre to keep the
vehicle stopped; use the brake pedal and
work on the accelerator pedal only when
you decide to move off;
– use second gear onlywhen necessary
to obtain better control of pick-up in low
speed manoeuvres;
– if, with reverse gear engaged, you need
to engage first gear or vice versa, shift gear
only when the car is completely stationary
and with the brake pedal pressed. This should not be considered as a fault as
it is part of the operating logic. For the same
reason, in the event of sticking on reverse,
the system commands partial clutch closing
to allow engagement of the gear; in this
case engagement of reverse gear (R) will
be less comfortable.
Moving off of the vehicle is obtained:
1) releasing the brake pedal;
2) gradually operating the accelerator
pedal.
The vehicle pick-up torque is higher the
more the accelerator pedal is pressed.
MOVING OFFWith the engine running and the vehicle
stationary, the gears that can be engaged
for moving off are only first (1), second (2)
or reverse (R).
To engage them it is possible to use the
control lever on the centre console, with the
brake pedal pressed, as the levers on the
steering wheel allow gear engagement only
over 0.5 km/h.
WARNINGReverse gear (R) can be en-
gaged from each of the following other ra-
tios: neutral (N), first gear (1) or second
gear (2). If the car is on the move, the re-
quest is not accepted; it is necessary to wait
for the car to be completely stopped and
then request reverse (R) again.
The driver is informed of the reverse gear
engaged condition by the intermittent sound
of the buzzer as well as by the display on
the rev counter.
WARNINGIf while shifting from reverse
(R)/first gear (1) to neutral (N)/first gear
(1) sticking occurs on the first gear, the sys-
tem automatically engages second gear
(2).
After a request to shift
gear with the vehicle sta-
tionary, before pressing the accel-
erator pedal to make the car start,
the driver must always check that
the gear engaged shown on the
display is the one required.
WARNING