technical data AUDI A4 CABRIOLET 2009 Service Manual

Child Safety 11!1111
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& WARNING (continued)
will strike parts of the vehicle interior. The child can be seriously
injured or killed.
• Never install rear-facing child safety seats or infant carriers on
the front passenger seat. A child will be seriously injured and can be killed when the passenger airbag inflates .
• The inflating airbag will hit the child safety seat or infant
carrier with great force and will smash the child safety seat and
child against the backrest, center arm rest, door or roof.
• Always install rear-facing child safety seats or infant carriers on
the rear seat.
• Forward-facing child safety seats or infant carriers installed on
the front passenger's seat may interfere with the deployment of
the airbag and cause serious injury to the child.
• It is safer to install a forward -facing child safety seat on the rear
seat.
• Always read and heed all WARNINGS whenever using a child
restrained in a vehicle is being used~
page 190. Special precau­
tions apply when installing a child safety seat on the front passenger seat~
page 170, "Child restraints on the front seat -
some important things to know" .
& WARNING
Always take special precautions if you must install a forward or
rearward -facing child restraint on the front passenger's seat in
exceptional situations:
• Whenever a forward or rearward-facing child restraint is
installed on the front passenger seat, the PASSENGER AIR BAG
OFF light must come on and stay on whenever the ignition is
switched on.
• If the PASSENGER AIR BAG OFF light does not come on and stay
on , perform the checks described
~ page 179, "Monitoring the
Advanced Airbag System".
Controls and equip­ ment Safety first
Vehicle operation
& WARNING (continued)
• Take the child restraint off the front passenger seat and install
it properly at one of the rear seat positions if the PASSENGER AIR
BAG OFF light does not stay on whenever the ignition is switched
on.
• Improper installation of child restraints can reduce their effec­
tiveness or even prevent them from providing any protection.
• An improperly installed child restraint can interfere with the
airbag as it deploys and seriously injure or even kill the child.
• Always carefully follow the manufacturer's instructions
provided with the child safety seat or carrier.
• Never place additional items on the seat that can increase the
total weight registered by the weight-sensing mat and can cause
injury in a crash.
& WARNING
Forward-facing child restraints:
• Always make sure the forward-facing seat has been designed
and certified by its manufacturer for use on a front seat with a
passenger front and side airbag.
• Never put the forward-facing child restraint up, against or very
near the instrument panel .
• Always move the passenger seat into its rearmost position in
the seat's fore and aft adjustment range, as far away from the
airbag as possible before installing the forward-facing child
restraint. The backrest must be adjusted to an upright position.
• Make sure that the PASSENGER AIR BAG OFF light comes on
and stays on all the time whenever the ignition is switched on.
& WARNING
Rearward -facing child restraints:
Vehicle care Do-it-yourself service Technical data

Child Safety IJ!III _________________________________ __:::...:....:...:..::.:......:__ ___ ....:.!.-__
& WARNING (continued )
• Always make sure the seat backrest to which the child restraint
is installed is in an upright position and securely latched into place
and cannot fold forward . Otherwise , the seat back with the child
safety seat attached to it could fly forward in the event of an acci ­
dent or other emergency situation .
• Always read and heed all WARNINGS whenever using a child
restrained in a vehicle is being used
=> page 190 . Special precau­
tions apply when installing a child safety seat on the front passenger seat=>
page 170 , "Child restra ints on the front seat -
some important things to know ".•
Deactivating the convertible locking retractor
The c onver tib le l ocking retrac tor for ch ild res tra in ts will
be d ea ctivat ed automat ically wh en the belt i s wound all
th e way ba ck in to the retractor .
-Pre ss th e red bu tton o n the sa fety be lt bu ckle . Th e b elt
t o ngue will pop out of the b uck le .
- Guide the be lt all the w ay b ack in to i ts s to w ed p osition.
A lways l et t he safety belt retract complet ely into its stowed pos itio n.
T he safety belt can now be used as an ord inary safety be lt w ithout
t he conve rtibl e locking retractor for chi ld restrain ts.
I f the converti ble locking retractor should be activated inadvert ­
en tly, the safet y belt must be unf astened and guid ed completel y
back into its stowed pos ition to deactivat e th is feature. If the
c o nver tible loc kin g re tractor is n ot deac tiva te d , th e safe ty be lt wi ll
g radua lly becom e tighter and uncomfortab le to w ear .
Controls and equip­
ment Safety first Vehicle operation
& WARNING
Improperly installed
child safety seats in crease the risk of serious
personal injury and death in a collision.
• Never unfasten the safety belt to deactivate the convertible
locking retractor for child restraints while the vehicle is moving .
You would not be restrained and could be seriously injured in an
accident.
• Always read and heed all WARNINGS whenever using a child
restrained in a vehicle is being used=>
page 190. Special precau ­
tions apply when installing a child safety seat on the front
passenger seat=>
page 170 , "Child restraints on the front seat -
some important things to know ".•
Additional Information
What types of child restraint anchors are
available and how are they related to child
safety?
F or years, chil d restraints have been installed using the safety belts
a lre ady pre s en t in ev ery ve hicle .
Sinc e Septem ber 1, 1999, c hild restraint manufactur ers have b een
providing tether straps that attach the top of the chi ld rest raint to
th e veh icles structure, on most of t heir forward -facin g syst ems in
order to com ply with U.S. Federal regulations for child restraint
per formanc e in a cras h. V ehi cle m anu fac tur ers a re r equi red to
phase -i n tether ancho rages for attach ment of the tether st rap in
their U.S. veh icles beginni ng Septem ber 1, 1999.
The combi nation of the t ether anc horag es and t he lower anchor ­
age s is now gene ra lly calle d th e
LATCH system f or "Lo w er An chors
and Tether for Children ". ..,
Vehicle care Do-it-yourself service Technical data

_______________________________________________ C_h _i_ld _ S_ a_ f_ e_ t...: Y _ _____.1!1111
Installing the guidance fixtures
- Push down on the seat cushion so that the lower anchor ­
ages are visible.
- Hold the guidance fixture with the part number facing downward and push it in the direction of the arrow onto
the anchorage :::::, fig. 187.
- Make sure that each of the two guidance fixtures per seat
snaps into place.
Removing the guidance fixtures
- Remove the child restraint according the child restraint
manufacturer's instructions.
- Push down on the seat cushion so that the lower anchor ­
ages are visible.
- Pull off the guidance fixtures from the lower anchorages.
- Always remove the guidance fixtures and keep them in a
safe place when not in use.
You may find it easier to install child restraints equipped with hooks
attached to straps without the guidance fixtures in place. If this is
the case, remove the guidance fixtures by pulling them off the
anchorages . However, the guidance fixtures can help you to locate
the
LATCH anchorages.
& WARNING
Improper use of tether anchorages or lower anchorages can cause
serious personal injury in a crash.
• Always carefully follow the child restraint manufacturer's
instructions for proper installation and use of child restraint
systems.
Controls and equip­ ment Safety first Vehicle operation
& WARNING (continued)
•
Never use the LATCH or tether anchorages to attach safety
belts or other kinds of occupant restraints.
• Child restraint tether attachments and lower attachments are
only designed to secure a child restraint that has been equipped
to use these anchorages.
• Tether anchorages and lower anchorages are designed to with­
stand only those loads imposed by correctly fitted child restraints.
Under no circumstances can they be used safely for adult or child
safety belts or harnesses.
• Never mount more than one child restraint to a single tether or
to a lower anchorage point. Attaching two child restraints to a
single anchorage point can cause the anchorage to fail and cause
serious personal injury in a crash.
0 Note
If you leave the guidance fixtures installed for several days, they
could leave a mark on the upholstery on the seat cushion and back­
rest in the area that the guidance fixtures were installed. The uphol ­
stery would also be permanently stretched around the guidance
fixtures. This applies especially to leather seats.
[ i] Tips
• Always remove the guidance fixtures when not in use.
• Please keep the guidance fixtures in a safe place with the vehicle
when not in use .•
Vehicle care Do-it-yourself service Technical data

_______________________________________________ C_h _i_ld _ S_ a_ f_ e_ t...:; y ______ __
Mounting and releasing the anchorage hook
If you use a child restraint system with hook-on or push-
on connectors attached to adjustable straps.
Mounting
- Press the anchorage hook with the spring catch release
onto the lower anchorage so that the anchorage hook
locks into place .
- Pull on the anchorage hook to make sure that it has
securely engaged the lower anchorage.
- Tighten the strap following the child restraint manufac­
turer's instructions.
Releasing
- Loosen the tension on the strap following the child
restraint manufacturer's instructions .
- Depress the spring catch on the hook or push button to
release the push -on connector catch.
- Hold the spring catch in depressed position.
- Move the hook in the direction of the vehicle floor so that
there is enough space to release the anchorage hook
from the lower anchorage.
& WARNING
• Improper installation of child restraints will increase the risk of
injuries in a crash.
• Always refer to the child restraints manufacturer's instructions
for proper installation of the child restraint and proper use of the
lower anchorages or safety belts in your vehicle. •
Controls and equip­ ment Safety first Vehicle operation
Vehicle care Do-it-yourself service Technical data

The direction in which the driver wishes to travel is determined with
the aid of the steering angle and vehicle speed and is continua lly
compared with the actual behavior of the vehicle. If the two do not
match, -for example, when the vehicle starts hydrop laning on a
wet road -, ESP will automatical ly brake the appropriate wheel to
correct the problem.
The veh icle is then stabi lized by the forces act ing on the whee l
during braking. If the vehicle is oversteering (rear tends to skid out
of the turn), the brakes are mainly app lied on the whee l that is on
the outside of the curve. In the case of a vehicle that is understeering
(tendency to s lide out of the curve), the brakes are applied at the
rear wheel that is on the inside of the curve . An acoustic signal indi­
cates when ESP brake application cuts in =>
&.
The system operates across the entire speed range in combinat ion
with the ABS system => page 216 . If the Anti -Lock Brake System
(ABS) malfunctions, the ESP wi ll be out of act ion as well.
Activa tion
When you turn on the engine, ESP w ill automatica lly be activated
and will perform a self -test .
The system can be activated o r deactivated by pressing the butto n
=> page 212, fig . 190 . The warning light comes on when the system
is switched off .
Normally, the ESP should a lways be on, however, it may be advanta­
geous to turn off the system in certain specia l cases when some
degree o f wheel spin is desired such as :
• when driving with snow chains
• when driving in deep snow or on a loose surface (to allow the
whee ls to dig in to reach firm ground)
• when trying to "rock" the vehicle free whe n it has become stuck .
The system shou ld be reactivated once you are no longer in such
situations.
Both , the ABS and EDL systems are still functioning even if the ESP
is switched off .
Controls and equip­
ment Safety first Vehicle operation
Int
ellig ent tec hnol ogy
& WARNING
The Ele ctron ic Stab ilization Program is neve rth ele ss s ubje ct to th e
law s of phy sic s. It is p art icularly important to pay at tent ion to thi s
f ac t on wet and slipper y ro ad s. It i s therefore important th at yo u
alway s adapt your driving to the condition of the road and traffic
c onditio ns. Do not allo w the in crea sed safety prov ided by t he Ele c­
tronic Stabilization Program sy stem to lull you into a ccepting
addition al safety ri sk s.
• Plea se note that when ESP i s deactivated , the drive wheel s can
s pin on icy and slippery ro ads a nd the vehi cle can break away -
d anger of skidding ! C
E lectronic differential lock CEDL)
The electronic differential lock monitors the rotational
speed of the drive wheels.
Gener al notes
The electronic differential lock (EDU helps the car to start moving,
accelerate and c limb a gradien t on surfaces providing poor or
a lmost no grip . Without EDL, this would be difficult , if not impos ­
sible.
How the syst em works
The EDL operates automat ical ly . It monito rs the rotationa l speed of
the drive whee ls on an axle with the he lp of the ABS sensors
=> page 216 . If a noticeable difference in rotational speed between
the drive wheels on one axle is de tected (e.g. on slippery grou nd on
one side), the spinning wheel is braked, thereby transferring power
to the other drive wheel or wheels (a ll -whee l drive) . This is done up
to a speed of about 60 mph ( 100 km/h). Noises from the brake
system signal that wheel spin is being control led.
~
Vehicle care Do-it-yourself service Technical data

Braking
General information
What affects braking efficiency?
O pera tin g co ndition s and drivi ng h abit s
The brakes on today's automobiles are still subject to wear,
depending large ly on operating conditions and dr iving habits~
&­
On vehicles that are either driven mostly in stop -and -go city traffic
or are driven hard, the brake pads shou ld be checked by your autho­
rized Audi dealer more often than specified in the
W arr anty & Main ­
t e nanc e bo okle t.
Fai lure to have you r brake pads inspec ted ca n
resu lt in reduced brake performance.
On steep slopes, you shou ld use the braking effect of the engine.
This way, you prevent unnecessary wear on the brake system. If you must use your brakes, do not hold the brakes down continuous ly.
Pump the brakes at intervals.
Moi sture or road salt
If you are driv ing faster than 50 mph (80 km/h) and the windshie ld
wipers are on, the brake pads wi ll briefly touch the brake discs in
regu lar intervals so as to improve reaction time when braking on
wet surfaces. You, the driver, wil l not notice anything.
Under ce rta in conditions, for example, when dr iving through water
or very heavy rain, or even after washing your vehicle, the braking
effect can be reduced due to moisture (or in freezing conditions ice)
on the brake pads. A few cautious brake applications should dry off
the b rake pads or remove any ice coatings .
At speeds
over80 km/h and with the windshie ld wiper turned on, the
brake pads are app lied briefly to the brake discs. This occurs at
regu lar interva ls wi thout the driver not icing and provides for better
brake response time under wet conditions.
The effectiveness of the brakes can be reduced when the vehicle is driven on a sa lt-covered road and the brakes are not used. Likewise,
Controls and equip­
ment Safety first Vehicle operation
Int
ellig ent tec hnol ogy
you clean off accumulated sa lt coating from brake discs and pads
with a few ca utious applications of the brake ~
&-
Cor rosi on
There may be a tendency for dirt to build up on the brake pads and
corrosion to form on the discs if the car is not driven regularly or
only f or sho rt trips with little use of the brakes.
If the brakes are not used frequently, or if corrosion has formed on
the discs, it is advisable to clean off the pads and discs by braking
firm ly a few times from a moderately high speed~
&-
Fa ults in the brake system
If you shou ld notice a sudden increase in brake pedal trave l, then
one of the two brake circuits may have failed~
&-
Lo w brak e fluid l evel
Malfunctions can occur in the brake system i f the brake fluid level is
too low . The brake fluid level is monitored electronically .
Brake lining wear statu s
Brake lining wear may be checked by visua l inspection of the condi ­
tion o f the brake pads through the open ings in the wheel. If neces­
sary, the wheel may be removed for this inspection
~ page 293,
"Whee l change".
& WARNING
• You should perform braking maneuver s for the purpo se of
cl eani ng th e br ake sy stem onl y if ro ad condition s permit . Other
road u se rs mu st not be put a t ris k -you may cau se an accident!
• Before des cending a steep gr ade , reduce sp eed and sh ift tr ans ­
mi ssion into a lower gear or lower driving po sition . Do not ride the
brake s or hold the pedal d ow n too long or t oo often . This could
cau se the brake s to get hot and dimini sh brakin g efficien cy . _.
Vehicle care Do-it-yourself service Technical data

& WARNING (c ont in u ed)
ext ra sa fe ty a fforded by the ABS tempt you into t ak in g ex tr a risks .
The ABS cannot overco me th e law s of ph ysics.
[ i J Tips
• If ABS is not funct ioning properly, a warning light will come on.
See
=> page 20.
• If a fau lt occurs in the ABS, the EDL is also not funct ion ing . This
is indicated by the ABS warning light.
Brake assistant
T he brake assistant is designed to achieve the optimum
braking effect.
The brake assistant helps to increase the effective braking power
and thus to achieve a shorter stopping distance . If the driver
presses the brake pedal very quick ly, the brake assistant automati ­
cally boosts the braking force to the maximum level, up to the point
where the anti -lock brake function (ABS) intervenes to stop the
wheels from locking. You should then keep the brake pedal pressed until the vehicle has braked to the required speed. The brake assis­
tant switches itself off as soon as you re lease the brake peda l.
The brake assistant will not be operative if there is a malfunction in
the ABS .
& WARNING
Please remembe r that the accident risk always in cre a se s if you
dri ve to o fa st, e spe cially in cor ner s o r on a slipp ery road , or if you
follow th e vehicle ahead of you too clos ely. An increased a ccident
ri sk ca nnot be comp en sa ted even b y the brake assista nt , s o
alwa ys maintain a safe spe ed . •
Controls and equip­ ment Safety first Vehicle operation
Int
ellig ent tec hnol ogy
Servotronic® -advanced power
steering system
The power steering systems uses the power of the
running engine to allow precise steering with little effort.
The advanced Servotronic ® power steering system senses the road
speed and electronically adjusts power assistance to provide
comfortab le and safe steering response exactly matched to the
vehicle speed.
Power steering will not work if the engine is off. As a result, the
steering whee l wil l be hard to turn .
The power steering fluid level is checked during the schedu led
maintenance services.
0 Note
If there is an electronic ma lfunction, servotronic will still function
like a conventional power steer ing system, providing a constant
steering support force that is no longer proportionate to the vehicle
speed. This is most noticeable when tu rning the steering whee l at
low speeds (for examp le when parking), -more effort wil l be
requi red than usual.
• Be aware of the different than usual steering response and
adjust you r steering force accordingly .
• Have the problem checked and set right by an Audi dealer as
soon as possible .
[ i J Tips
• When the engi ne is running, never hold the steering whee l
turned all the way to the right or to the left for longer than 15
seconds. The power steering pu mp will overheat the hydraulic fluid
if you keep holding the steering wheel turned a ll the way. This is
likely to damage the power stee ring system.
~
Vehicle care Do-it-yourself service Technical data

Driving and environment
The first 1 ,000 miles (1,500 km) and afterwards
New engine
The engine needs to be run-in during the first 1,000 miles
(1,500 km).
For th e fir st 600 mil es (1 ,000 kil omet ers):
Do not use full throttle.
- Do not drive faster than 3/4 of the top speed marked on
the speedometer.
- Avoid high engine speeds .
Fr om 600 to 1 ,000 mil es (1,000 to 1 ,500
kilom ete rs ):
- Speeds can gradually be increased to t he maximum
permiss ible road or engine speed .
During and aft er br eak-in p eri od
- Do not rev the engine up to high speeds when it is cold. This applies whether the transm ission is in N (Neutral) or
1n gear.
After the br eak -in period
- Do not exceed max imum e ngine speed unde r any
circumstances.
- Upshift into the next higher gear before reaching t he red
area at the end of the tachome ter scale ~ page 12 .
Controls and equip­
ment Safety first Vehicle operation
Driving
and environm ent
During the first few hours of driving, the eng ine's internal friction is
higher than later when all the moving parts have been broken in.
How well this break-in process is done depends to a cons iderable
extent on the way the vehicle is driven during the first 1,000 miles
(1,500 ki lometers).
0 Not e
Extremely high engine speeds are automatically reduced. However,
these RPM -limits were programmed for an engine we ll run-in , not a
new engine .
~ For the sake of the environment
Do not drive with unnecessarily high engine speeds -upshifting
early saves fuel , reduces noise and protects the environment.
New tires
If your v ehicle is r un ning on new tires, driv e particularly
carefu l for the first 350 miles (500 ki lometers) after fitting.
& WARNING
New tire s te nd to b e slipp ery and mu st al so be " brok en -in ". Be
su re t o reme mber thi s during th e fir st 350 m ile s (5 00 kil ome ters).
Br ake gent ly. A vo id following clo se ly behind oth er vehicle s or
ot her situ ati ons that might requi re su dd en , har d b raking.•
Vehicle care Do-it-yourself service Technical data

- Lack of proper maintenance as wel l as improper use of the
vehic le wi ll impair the function of the emission control system
and could lead to damage.
'£> For the sake of the environm ent
Even when the Emission Control System is operating properly, the
exhaust gas can have a su lfur -like exhaust gas sme ll under some
operating states. This depends on the sulfur content of the fuel
being used. Using a different brand of fue l may help, or filling the
tank with lead-free super grade gasoline. •
Avoid damaging the vehicle
When you are driving on poor roads, or over curbs, steep ramps,
etc., make certain that low- lying parts such as spoilers and exhaust
system parts do not bottom out and get damaged.
This is especially true for vehicles with low -slung chassis (sports
chassis)* and fully loaded vehicles.
a
Operate your vehicle economically
and minimize pollution
General
Your personal style of driving will determine the economy
of your vehicle, as well as exhaust and noise levels.
Fuel economy, environmental impact, and wear on your engine,
brakes and tires largely depend on three factors:
• your personal driving style
• operating cond itions
• technica l limitat ions
Controls and equip­
ment Safety first Vehicle operation
Driving
and environm ent
If you anticipate what you need to do next and drive economica lly,
you can easily cut your fuel consumpt ion by 10 -15 percent . This
section wil l give you some tips on how you can help the environ­
ment and your pocketbook.
[ i ] Tips
The consumption est imates as published by ENV IRONMENTAL
PROTECTION AGENCY (EPA) and Transport Canada may not corre ­
spond to your actua l consumption on the road, which will vary
depending upon vehicle load and speed, road and weather condi­
tions, trip length, etc. •
Drive smoothly and keep a lookout ahead
Vehicles use the most fuel when they ore accelerating .
-Avoid unnecessary accelerating and brak ing.
Vehicles use the most fue l when they are accelerating . If you antici­
pate what is going to happen next, you wi ll need to brake less and,
thus, acce lerate less. Let the vehicle coast whenever possib le - for
examp le when you see that the next traffic light is red. •
Avoid full throttle
Driving at moderate speeds saves fuel and improves your
mileage.
-Try and keep well below your car's maximum speed.
Acce lerating gently reduces fuel consumption, engine wear, and
does not disturb the environment.
Fue l consumption, exhaust emissions and engine noise increase
disproportionately at high speeds . If you drive at approximately
three quarters of top speed, fuel consumption wil l be reduced by •
Vehicle care Do-it-yourself service Technical data

The engine and catalytic converter have to reach their optimal oper­
ating temper ature
to reduce fuel consumption and noxious emis ­
sions effective ly.
Just after starting, a cold engine in a mid -size car only achieves a
fue l economy of 6-8 miles per gallon (30-40 1/100k m). After about a
half a mile, fuel economy climbs to 12 mpg (201/100 kml. After about
2.5 miles (4 km), the engine is at its proper operating temperature
and fuel economy has reached a normal level. So you can see that
you should avo id short tr ips whenever possib le .
The
outs ide temperat ure is also critical in this regard. Your car
consumes more fuel in the winter than in the summer. •
Controls and equip­
ment Safety first Vehicle operation
Driving
and environm ent
Vehicle care Do-it-yourself service Technical data