2012 AUDI A3 check engine

208 Check ing and filling
for questions about the battery -danger
of acid burns and explosion hazard!
- The battery must not be opened! Do not try to change the battery's liq uid level ,
otherwise detonating gas will escape
from the battery- explosion hazard!
- The AGM battery in the luggage com­
partment cannot leak, because the elec­
trolyte for th is battery is absorbed into a
spec ial glass mat . Th is leak-proof battery
must not be replace with a conventional
battery .
- Make sure the ventilat ion hose on the
s ide of the battery is connected, other ­
wise fumes or battery acid can leak out .
- Battery ho lder and terminals a lways
have to be secured correctly .
- Before all work on the battery follow the
warning s below c> &. in Working on the
battery on page 208 .
Working on the battery
All work on the battery requires technical
knowledge! Be especially careful when work ­
ing on or near the battery!
Be fo re you check any thing in the engine com­
partment, always
r e ad a nd heed all WARN­
INGS
~ .&. in Working in the engine compart­
ment on page 194 .
Always heed the s afety warnings , when work­
i ng on the vehicle battery or the vehicle elec­
tr ica l system to preve nt injury .
The following WARNINGS are very
important when working on the battery:
Always heed the following WARNING SYM ·
BOLS and safety precautions when working on the battery.
Always wear eye protection.
Battery acid contains sulfuric
acid . Always wear glove s and
eye prote ction . No
• sparks
• flames
- smoking.
When a battery is charged , it
produces hydrogen gas which is
e x plosive and cou ld cause per­
sonal injury .
®
Always keep the battery well out
of reach of children.
A WARNING ,___
Whenever working on the battery or on
the electrical system, there is the risk of
i njury, accident and even fire . Read and
heed the following WARNINGS :
- Always wear eye protection . Do not let
battery ac id or any lead particles get on
your skin o r clothing . Shield you r eyes.
Exp losive gases can cause blindness or
o ther inju ry!
- Battery acid conta ins sulfuric acid. Sulfu­
ric acid can ca use blindness and severe
bu rns.
-Always wear g loves and eye protection.
Do not tilt the battery because acid
could leak out of the ventilat ion open­
ings .
- If you get battery ac id in your eyes or
on your skin, immediately rinse with
cold water for several minutes and get med ica l attent ion .
- If you shou ld ingest any battery acid,
seek medical attention immediately .
- Do not expose the batte ry to an open
flame, electr ic sparks or an open l ight.
- Do not smoke.
- Do not interchange the positive and neg-
ative cables.
- When working on the battery, be s ure
not to short-circu it the terminals w ith
too ls or othe r metal objects. Th is would
cause the battery to heat up very quickly,
which could lead to damage or explosion
-
and pe rsonal injury . ~

-When a battery is charged, it produces
hydrogen gas which is explosive and
could cause personal injury.
- Always keep the battery well out of the
reach of children.
- Before work is done on the electrical sys­
tem, disconnect the negative ground ca­
ble.
- Before performing any work on the elec­
trical system, switch off the engine and
ignition as well as any electrical equip­
ment. The negative cable on the battery
must be disconnected. If you are just go­
ing to replace a light bulb, then it is
enough to switch off the lights.
- Before disconnecting the battery, switch
off the anti-theft alarm system! Other­
wise you will set off the alarm.
- When disconnecting the battery, first
disconnect the negative cable and then
the positive cable.
- Before reconnecting the battery, make
sure all electrical consumers are switch­
ed off. Reconnect the positive cable first
and then the negative cable. Never inter­
change the cables -this could start a fire!
- Never charge a frozen or a thawed-out
battery. It could explode! If a battery has
frozen, then it must be replaced. A dis­
charged battery can freeze over at
32 °F
(0 oc).
-Mak e sure the vent hose is always attach­
ed to the opening on the side of the bat­
tery.
- Never use batteries which are damaged.
There is the danger of an explosion! Al­
ways replace a damaged battery.
_& WARNING
California Proposition 65 Warning:
- Battery posts, terminals and related ac­ cessories contain lead and lead com­
pounds, chemicals known to the State of
California to cause cancer and reproduc­
tive problems. Wash hands after han­ dling.
Checking and filling 209
(D Note
- Do not disconnect the vehicle battery
when the ignition is switched on or when
the engine is running, otherwise, you will
damage electronic components in the
electrical system.
- When working on the engine, protect the
battery housing from ultraviolet (UV)
rays by not parking the vehicle in direct
sunlight .
- If your vehicle is going to stand for a
long period of time without being driven,
protect the battery from "freezing", oth­
erwise it will be damaged and will then
have to be replaced
~ page 209.
Charging of battery
All work on the battery requires technical knowledge!
Fig. 165 E ngine compart ment: conne ctors for a charg­
er and jump start cables
A charged battery ensures good starting per­
formance . A discharged battery can
freeze at
temperatures of only
O 0C. A frozen or thawed
battery must be replaced, as the battery
housing may be cracked due to freezing and
could therefore leak acid.
.,. Always read and heed all WARNINGS be­
low~ .&, and ~.&, in
Working on the bat­
tery on page 208.
... Switch off the ignition and all electrical con­
sumers .
.,. Make sure the area is well ventilated when
you charge the battery.
.,. Connect charger cables.
Charger cables
must always be connected POSITIVE
G to ..,.

210 Check ing and filling
POS IT IVE E] and NEGATI VE [:] to NEGATIVE
(j ump sta rt pins)[:].
.. Switch on the charger.
• Make sure the charging rate is not over
6 amps.
• Turn off the charger¢,&..
• Disconnect the charger cables.
• Connect both battery cables to the battery
i f necessary -
first plus, then minus.
The battery must not be opened!
¢ @ in Gen­
eral information on page 207 .
Chargi ng the b attery
Only use chargers with a m ax im um cha rg in g
v oltage o f
14.8 V. The battery connecting ca­
bles do not need to be disconnected. Do not
open the battery when charging.
Read all of the manufacturer's instructions for
the charger before charting the battery.
It is not necessary to remove the battery from
the engine compartment, and it is a lso not
necessary to disconnect the cables.
Normally, a battery should be charged at no
more than 10 percent of its rated capacity.
For example, a charging current of 4.5 amps
wo uld be used on a battery rated at 45 Ah.
Rated capacity of the battery in your veh icle is
listed on the battery housing .
The battery caps shou ld
not be opened when
cha rg ing a battery.
_& WARNING
Cha rging a battery can be dangerous.
- Never charge a frozen battery. It may ex­
plode because of gas trapped in the ice .
Allow a frozen battery to thaw o ut first .
- Do not reuse batteries which we re fro­
zen. They must be replaced. The battery
housing may have cracked and weakened
when the battery froze.
- Charge the battery in a we ll ventilated
area. Keep away from open f lame or elec­
trical spark. Do not smoke. Hydrogen gas generated by the battery is explosive. -
To reduce the danger of exp losion, never
connect or d isconnect charger cab les
while the charger is operating.
- Fast charging a battery is dangerous and
should only be attempted by a compe­
tent techn ic ian with the proper equip­
ment.
- Battery acid that may sp ill dur ing charg­
ing should be washed off with a solut ion
of warm water and baking soda to neu­
tralize the ac id.
{[) Note
-Make sure that the gas venting hose is
always connected to the or iginal opening
on the battery s ide. Otherwise gasses or
battery acid could leak out.
- Never use a fast charger as a booster to start the engine. This will seriously dam­
age sensitive electron ic components,
such as contro l units, re lays, radio, etc.,
as well as the batte ry charger.
- T he vehicle may be optionally equ ipped
w ith a gel battery, wh ich can only be
charged at a cons tant current-lim ited
voltage . To prevent damage to the bat ­
tery and the electronics system, a gel battery that is connected must under no
circumstances be charged with a quick
charger.
{!) Tips
- The vehicle battery must not be charged
with a standard small charger that pl ugs
into the outlet.
- Only charge the battery through the con­
nections in the engine compartment.
Battery replacement
The new battery must hove the some specifi­
cations as the old one.
Intelligent energy management in your vehi­
cle is responsible for distributing the electri­
ca l energy throughout your vehicle
¢
page 167. The intelligent energy manage-
ment system will keep the engine battery .,..

charged better then vehicles without this sys­
tem . To make sure the additional e lectrica l en ­
ergy is available once again after you have
changed the battery, we recommend that you install batteries of the same type and manu­
facture only (the same as those installed at
the t ime your vehicle was delivered). Specifi­
cations are listed on the battery hous ing . Your
authorized dealer must code the battery in
the energy management system to enable yo u
to use the energy management functions cor­
rectly after replacing the bat tery.
If it is not possible to use a battery of this
type, the new battery must have the same ca­
pacity, voltage (12 volts) , amperage, con ­
struction and plug sealing.
We re commend that you use ma intenance­
free or
cy cle -re sis tant /le ak-proof batteries
that conform to the standards TL
825 06
(from December 1997) and VW 7 SO 73 (from
Aug ust 2001).
When insta lling the bat tery , make sure the ig­
n ition and all e lectrica l consumers are turned
off .
CD Note
-Make sure tha t the gas venting hose is
always connected to the o riginal open ing
on the battery side . Otherwise gasses or
battery acid could leak out.
- Battery mounts and clamps m ust always
be secured correctly.
- Read and follow the warnings under
C? page 208, Working on the battery be ­
fore performing any work on the battery .
@ For the sake of the environment
Because of the problem of proper d isposa l
o f a battery, we recommend your author ­
ized Audi dealer change the batte ry for
you. Batteries contain su lfuric ac id and
lead and must always be disposed of prop­
erly in compliance w ith all environmental
regu lations . D isposing of vehicle batte ries
improperly is very dangerous to the envi­
ronment. Make sure that the removed bat-
Checkin g and fillin g 211
tery cannot overbalance, otherwise su lfu ­
ric acid might escape!
Windshield washer container
Using plain water is not adequate for filling
the $ windshield washer system .
Fig. 166 En gin e compart men t: w in ds hield washer flu­
i d co ntai ner
The windshield washer fluid container is locat­
ed on the right side of the engine compart­
ment ~
fig. 166. The washer fluid conta iner is
marked w ith the symbol $ is on its cap .
.,. Before you check anything in the engine
compartment, always
read and heed all
W ARNINGS ~ _&. in Working in the engine
compartment on page 194.
.,. Lift the fil le r ca p tongue to add washer flu ­
id. You can fi ll the container to the top.
.,. Press the cap back onto the f iller neck after
f illing the container .
You can find the reservo ir
capacity in t he t able
in
C? page 257.
Clean water should be used when filling up . If
poss ible, use soft water to prevent scaling on
the washer jets. Always add a glass cleane r
solu tion (with frost protection in t he win ter).
CD Note
Do not mix engi ne coolant antifreeze o r
a ny o ther addi tives to fill up the wind­
sh ield washer rese rvoi r.

236 What do I do now?
-After installing the compact spare wheel,
the tire inflation pressure should be
checked and, if necessary, increased to
60 psi (4.2 bar).
- The load carrying capacity is marked on
the tire sidewalls and must not be ex ­
ceeded.
- After installing the compact spare wheel,
make sure that you remount the flat tire
in its storage area properly.
- The compact spare tire should be proper­
ly remounted in its storage area as soon
as the standard road tire can be re­ placed .
- Because the compact spare tire was spe­
cifically designed for your vehicle, it must not be used on any other vehicle .
Likewise, compact spare wheels from
other vehicles must not be used on your
vehicle.
- The compact spare tire must not be
mounted on any other wheels, nor must
standard tires, snow tires, wheel covers
or trim rings be used with the compact
spare wheel. If such use is attempted,
damage to these items or other vehicle
components may occur .
(D Tips
Check the inflation pressure of the com­
pact spare tire (60 psi/4.2 bar) periodically
to keep the tire ready for use.
Wheel change
Before changing a wheel
Observe the following precautions for your
own and your passenger's safety when chang­
ing a wheel .
.. After you experience a tire failure, pull the
car well away from moving traffic and try to
reach
level ground before you stop c:> ,&. .
.. All passengers should leave the car and
move to a safe location (for instance, behind
the guardrail)
c:> _&. .
.. Apply the parking brake firmly c:> _&. .
.. Move selector lever to position Pon an au­
tomatic transmission ; put manual transmis­
sion in
first gear c:> _&..
.. If you are towing a trailer : unhitch the trail­
e r from your vehicle.
.. Take the
tool and the spare tire c:> page 234
out of the luggage compartment .
.&, WARNING
You or your passengers could be injured
while changing a wheel if you do not fol­
low these safety precautions:
- If you have a flat tire, move a safe dis­
tance off the road. Turn off the engine,
turn the emergency flasher on and use
other warning devices to alert other mo­
torists.
- Make sure that passengers wait in a safe place away from the vehicle and well
away from the roadway and traffic .
- To help prevent the vehicle from moving suddenly and possibly slipping off the
jack, always fully set the parking brake
and block the wheel diagonally opposite
the wheel being changed. When one
front wheel is lifted off the ground, plac ­
ing the automatic transmission in "P"
(Park) , or engaging a gear in a manual
transmission will
not prevent the vehicle
from moving.
- Before you change a wheel, be sure the
ground is level and firm. If necessary,
use a sturdy board under the jack.
- After installing the spare wheel, make
sure that you remount the flat tire/wheel
in its storage area properly and tighten
the knurled retaining screw securely.
Changing a wheel
-
When you change a wheel, follow these­
quence described below step-by-step and ex­
actly in that order .
1. Remove the decorative wheel cover*. For
more details see also
c:> page 23 7, Deco­
rative wheel covers
or c:> page 238,
Wheels with cap-covered wheel bolts.

Fuses and bulbs
Electrical fuses
Replacing fuses
A problem in the electrical system may be caused by a blown fuse .
Fig. 189 Left cockpit: fuse pane l cover
Fig. 190 Left side of eng ine compartment: fuse cover
Fuse cover on the left end face of the
instrument panel
.. Turn off the ignition and the affected elec ­
trical consumers .
.. Carefully pry the fuse cover off the instru­
ment panel using the ignit ion key or a
screwdriver
c;> fig. 189 .
.. Check the following table to see which fuse
belongs to the consumer
c;> page 244, Fuse
Location, Instrument Panel left.
.. Remove the clamp from the rear side of the
fuse cover ¢
fig. 189.
.. Remove the fuse using the clamp and re­
place the blown fuse w ith an identical new
one.
• Firmly snap the cover back onto the instru­
ment panel face .
Fuses and bulbs 243
Fuse cover in engine compartment
.. Tur n off the ignition and the affected elec­
trical consumers .
.. Check the following tab le to see which fuse
be longs to the consumer
c;> page 245, Fuse
location, left side of engine comportment .
.. Unlatch the fuse cover, push the two slides
forward ¢
fig. 190.
• Remove the clamp from the rear side of the
fuse cover
c;> fig . 189.
• Remove the fuse using the clamp and re­
place the blown fus e with an ident ical new
one .
.. Push the two slides to the rear¢
fig. 190.
Insta ll the f use cover caref ully to prevent
water from entering.
T he var ious electrical circ uits are protected by
fuses. The fuses are clustered in a centralized
unit. The unit is located behind the face panel
at the end of the instrument panel.
You are well advised to keep a supply of spare
fuses in your vehicle . Fuses with the proper
ampere rat ings are avai lab le at your author­
ized Audi dealer.
_& WARNING
= -
Do not repair fuses and never replace a
blown fuse with one that has a higher amp
rating. This can cause damage to the elec­
trical system and a fire .
(D Note
If a new fuse burns out again after shortly
have you have installed it, have the electri­
ca l system checked by your authorized Au­
di dealer .
(D Tips
-The following table does not list fuse lo­
cat ions that are not used .
- Some of the equipment items listed are
optional or only available on certain
model configurations.

No. Equ ipment
Electronic Stabilization Pro-
14
gram (ESP) (control mod-
u le), shift gate automatic
transmission
15 Interior lights, reading
lights
Diagnostic connector, rain
sensor, air conditioning
16 (control module), t
ire pres-
sure monitor d isplay (con-
trol module)
I 17
Anti-theft alarm warning
system
18 D iagnose Starter
19 All Wheel D rive
20 Audi magnetic ride
Blower fan
23
Driver's
side power window,
front
24 Power outlet front
2S Rear window defogger
26 Power outlet in luggage
compartment
27 Fuel tank control module,
fuel pump
28 Power window, rear
33 Slidi ng/pop-up roof
36 Lumbar support
37 Heated sea ts, front
1 38
Passenger side power win-
dow, front
39 Specia l func tion interface
40 Starter
41 Rear window wiper
43 Body control module
47
Ce ll phone package (V OA in-
terface)
Automatic circuit breakers:
10
10
10
5
5
10
40
30
20
30
20
15
30
20 10
20
30
5
40
15
20 5
The electri c power w in dows and the e lectr ic
seat adjusters are pro tected with circu it
breake rs which reset automatically after the
circuit overload has been corrected.
Fu se s and bulb s 245
@ Tips
-Whenever rep lacing a fuse, always con­
sult the sticker on the inside of the f use
pane l cover. It contains the most up-to­
date information regarding the fuse ar­
rangement. If in doubt, ask your author­
ized Aud i Service adviso r.
- Some of the equipment items listed are
opt ional or only available on certa in
mode l configurations.
Fuse location, left side of engine
compartment
Fig . 192 En gine compar tment : fuse assig nment
,._
-d. a, a>
Check the fuse layout with the f use panel cov­
er removed
¢ page 243, Fuse cover in engine
comportment.
Some of the equipmen t items listed are op­
tiona l or only ava ilab le on certain model con ­
figurations.
Please note tha t the preced ing tab le was ac­
c u rate at the time of pr int ing and is subject to
c h ange.
No. Equipment
F2 Engine compone nts
F3 Battery voltage ESP valves, Anti-lock brake
F4 system (ABS) valves
Transmission control mod­
F5 ule
F6 Steering wheel e lectronics
Amps
20
5
20
15
s

248 Emergency situations
Emergency situations
General
This chapter is intended for trained emer­
gency crews and working per sonnel who
have the necessary tools and equ ipment to
perform these ope rations.
Starting by pushing or
towing
Q;) Note
Vehicle s with an automati c transmission
cannot be started by pushing or towing .
Starting with jumper
cables
Jumper cable: Note the manufacturer's infor­
mation.
If th e battery is d ischa rged, another vehicle
can provide starting assistance. For this you
req uire a j umper cab le . Both batteries m ust
have the same voltage (V) and a s imilar ca­
pac ity (Ah).
Jumper cables
Use only jumper cab les of sufficiently
large cross section to safely carry the sta rter
cur rent. Refer to the manufacturer 's specifica ­
ti ons.
Use on ly jumper cables with
isola ted termina l
clamps an d properly marke d for distinction :
plus(+) cable in most cases colo red red
minu s(-) cable
in most cases colo red black .
The wire cross section must be at least
0.038 in
2 (25 mm2 ) for gasoline eng ines and
at least 0.054 in
2 (35 mm2
) for diese l en­
gines .
A WARNING
Batte ries co ntain e lec tricity, ac id, a nd gas .
Any of these can cause ve ry ser io us or fatal i
njury . Follow the instructions below for
safe handling o f your vehicle's battery.
- Always shie ld your eyes and avo id lean-
ing over the battery wheneve r poss ib le.
- A discharged battery can a lready freeze
at temperatures just be low 32 °F (0 °() .
N ever attempt to provide start ing ass is­
tance on a frozen or thawed out batte ry -
Da nger of explosion and chemical burns!
Replace a battery if it has bee n froze n.
- Do not allow battery acid to contact eyes
or skin . Fl ush a ny con tacted a rea with
wa te r immediat ely .
- Imp rope r use of a booster battery to
start a vehicle may cause an ex plosion .
- Vehicle batter ies ge nerate explosive gas­
e s . K eep spar ks, flame and lighted c iga ­
r e ttes away from ba tteries.
- Do not try to ju mp start a ny ve hicle w it h
a low ac id leve l in the battery .
- The vo ltage of the bo oste r batte ry m ust
a lso have a 12-Vo lt rat ing. T he capacity
(A h) of the booste r battery sho uld not b e
lowe r than that of the discharged bat­
tery . U se o f batte rie s of d iffe ren t voltage
or subs tan tia lly diffe ren t "Ah" rat ing
may c ause an exp losion and person al in­
jury .
- N ever ch arge a fr oze n b atte ry. Gas t rap­
ped in the i ce may c ause an ex plosion .
- N ever ch arge or use a batt ery th at h as
been frozen . T he battery case may have
be weake ned.
- Us e of batt erie s of diff ere nt vol tage or
subs tanti ally diff eren t ca pac ity (Ah) rat ­
in g may cause an exp losion and injury.
The ca pac ity ( Ah) of the booster battery
should not be lower than that of the dis­
charged batte ry.
- Before you check anythin g in the engine
compa rtment, always read and heed a ll
WAR NIN GS¢
page 187, Engine com­
partment.