2015 AUDI TT ROADSTER check engine

If you have lost a consi derable amount of
coolant, then you should add co ld antifreeze
and cold water only when the engine is co ld .
Always use
new engine coolant when refi lling.
D o not fi ll coolant above the "MAX " mark . Ex­
cess coolant will be forced out th rough the
p ress ure rel ief valve in the cap when the en­
g ine becomes hot .
A WARNING ,_________
- The cooling system is under press ure and
can get very hot . Reduce the risk of
sca ld ing from hot coo lant by following
these steps.
- Tur n
off the eng ine and a llow itto cool
down.
- P rotect your face, hands and arms from
escap ing f lu id a nd steam by cover ing
the cap wi th a la rge, thick rag.
- Turn the cap slow ly and very ca refully
in a cou nte r-clockw ise d irect ion while
a pply ing ligh t, downw ard p ress ure on
the to p of the cap.
- T o avo id being burned, do no t sp ill an­
tifreeze or coolan t on the exhaust sys­
tem or hot engine parts . U nder certa in
conditions, the ethylene glyco l in en­
gine coolant can catc h fire .
- Antifreeze is poisonous . Always store an ­
tifreeze in its original container and we ll
o ut o f the reach of children.
- If you drain the coolant , it must be
caught and safely stored in a proper con­
tainer clearly marked "poison".
@ Note
- Do not add coolant if the expansion tank
i s empty . Ai r could enter the cooling sys­
tem and damage the engine. If this is
the case, do not continue driving. Seek professional assistance.
- Coolant po llutes the env ironment and
could cause a n engine fire. Excess coo l­
ant wi ll be f orced out through the pres­
su re re lief valve in the cap when the en ­
gine becomes hot.
Checkin g and fillin g 173
- If, in an eme rgency, on ly wate r can be
added, the co rrect ratio between water
and antifreeze ¢
page 171 must be re­
stored as soon as possible.
@) For the sake of the environment
Drained coolant sho uld not be reused. A l­
ways d ispose of used coolant while observ­
i ng a ll environmental regulations.
, Radiator fan
The radiator fan switches on automatically by
itself .
The electric radiator fan is controlled by ther­
moswitches that switch on and
off depending
on coo lant and eng ine compartment tempera­
tures.
An a uxiliary electric radiato r fan* sw itches on
and
off depending on coolant temperature
and othe r vehicle ope rat ion conditions .
After yo u switch the eng ine off, the aux iliary
f an can continu e running for up to 10 m inut es
- even with the ignition off. It can even switch
on again later by itself¢ & , if
- t he temperatu re of the engine coo lant rises
due to the hea t build -up from the engine in
the engine compa rtment, or
- the engine compa rtment heats up because
the vehicle is parked in intense sunlig ht.
A WARNING ~
- To reduce the risk of persona l in ju ry nev-
er touch the radiator fan .
- The a uxiliary electric fan is tempe rat ure
contro lled and can switch on suddenly
even when the engine is not running.
- The a uxiliary radiator fa n sw itches on a u­
tomatically when the engine coo lant
reaches a certai n temperature and will
continue to ru n until the coo lant temper­
ature drops. •
•

17 4 Che cking and filling
Brake fluid
Checking brake fluid level
Fig . 133 Engine compa rtment: cove r on the brake fluid
reservo ir
Before you check anything in the engine com­
partment,
a lw ays read and h eed all WA RN­
ING S ¢&. in Working in the engine compart ­
ment on page 164.
,.. Read the brake fluid level from the brake
fluid reservoir¢
page 166, fig . 128. T he
brake flu id leve l must be between the "MIN"
and "MAX" markings.
The brake flu id rese rvo ir is located behind the
rear part ition of the eng ine compartment o n
the left side ¢
page 166.
The fluid level may drop slightly after some
time due to the automatic adjustment of the b rake pads . This is not cause for alarm.
If the brake fluid level falls
considerably be­
low the "MIN" mark, the brake warning/indi­
cator light (U.S. models: . , Canadian mod­
e ls: . ) w ill come on
¢page 14. Do not con­
tinue to operate the vehicle. The comp lete
brake system shou ld be thoroughly checked
by an authorized A udi dealer or other quali­
fied facility and the cause corrected.
If the
brake fluid level is too low, the brake warn ing/
indicator light w ill illuminate. Contact an au­
thor ized Audi dealer
imm ediatel y.
Changing brake fluid
Have the brake fluid changed by an experi­
enced technician .
Brake fluid absorbs moisture from the air. If
the water content in the brake fluid is too high, corrosion in the brake system may result
after a period of time . The boiling point of the
brake flu id will also decrease conside rably and
decrease braking pe rformance.
Therefore, the brake fluid must be changed
eve ry two y ears. Always use new brake flu id
which conforms to Federal Motor Veh icle
Standard "F MVSS 116 DOT 4".
The brake fluid reservoir can be diff icult to
reach, therefore, we recommend that you
have the brake fluid changed by your author­
ized
Audi dealer . Your dealer has the correct
tools, the right brake fl uid and the know -how
to do this for you.
A WARNING
- Brake fluid is poisonous . It must be stor­
ed only in the closed original container
out of the reach of children!
- Brake failure can resu lt from o ld or inap­
propriate brake flu id. Observe these pre­
cautions:
- Use only brake f luid that meets SA E
specifica tion
J 1 7 03 and conforms to
Federa l Moto r Ve hicl e Standard 1 16.
Always check with yo ur authorized Aud i
dealer to make sure yo u are using the
correct brake fluid. The correct type of brake f lu id is also ind icated on the
brake flu id reservoir.
- The brake fluid must be new. Heavy use
of the brakes can cause a vapor lock if
the brake fluid is left in the system too
l ong. This can seriously affect the effi­
c iency of the brakes as well as your
safety. This cou ld resu lt in an accident.
(D Note
Brake fluid will damage the paint of your
vehicle .

-Do not interchange the positive and neg­
ative cables .
- When working on the battery , be sure
not to short-circuit the terminals with
tools or other metal objects. This would cause the battery to heat up very quickly,
which could lead to damage or explosion and personal 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 fro zen 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 °C) .
-Make sure the vent hose is always attach­
ed to the opening on the side of the bat ­
tery.
- Never use batteries which are damaged.
Danger of explosion! Always replace a
damaged battery.
Checking and filling 177
A 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.
Q) 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.
- 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.
Checking the battery acid level on magic
eye batteries*
The battery acid level in the battery can be
checked through the clear inspection window .
Fig. 134 Lugg age compar tme nt: Battery w ith mag ic
e ye .
On top of the battery, there is a round "win­
dow". This window (magic eye) changes color
as the battery charge and acid level change.
.,. Read and heed all WARNINGS
~.&_ in
Working on the battery on page 176
.. Read the acid level from the window on the
battery ~
fig. 134. Ill>-

178 Checking and filling
Ai r bubbles in the window can cause an inac­
curate reading. Carefully tap on the side of
the w indow.
- If the window is gr ee n, the battery ac id leve l
is correct.
- If the window has no c olo r or is brigh t yel­
low ,
the battery acid leve l is too low . Have
the battery tested by your authorized A udi
dealer or a qualified workshop .
- If the window is
black , then the batte ry is
insufficiently charged. Recharge the battery
as soon as possible ¢
page 178.
@ Note
Do not overfill the battery, otherwise bat­
tery acid will overflow through the vent
opening. This can damage the paint and
cause corros ion.
Charging of battery
Starting the engine requires a well charged
battery.
• Alw ay s rea d and heed all WARNING S be­
low ¢
A and ¢ A in Working on the bat­
tery on page 176.
• Switch off the ignit ion and all electrical con­
sumers.
• Make sure the area is well vent ilated when
you charge the battery .
• Connect charger cables.
ALW AYS conn ect
c harg er cab les POSITIVE
G) to POSITIVE
G) ; NEGATIVE Qto NEGATIVE Q.
• Switch on the charger .
•T urnoff the charger ¢,& .
• Disconnect the charger cables.
• Connect both battery cables to the battery if
necessary-
first plus, then m inus.
When charging at
low voltages (e.g . with a
tri ckle char ger), the battery cables do not
have to be d isconnected first. Before charging
at
high voltages, i.e. "fa st charg ing ", you
must disconnect both cables. In e ither case,
follow the instruct ions from the manufacturer
of the charger. Fastcharging a battery is
dangerou
s ¢.&. in
Working on the battery on page 176 .
It re­
quires special charging equipment and the
knowledge to go with it. We recommend hav­
ing your battery fast charged only by a quali­
fied workshop .
A d ischarged battery can
freeze at tempera ­
tures of only
32 °F (0 °C). Allow a frozen bat­
tery to thaw completely before attempting to
charge it¢,&.. However, we recommend not
us ing a thawed battery aga in because the bat­
tery casing can be cracked due to ice fo rma­
t ion and can leak battery acid.
Do not open the battery caps when charging
the battery .
A WARNING ,..__ -
Charging a battery can be dangerous.
- Never charge a frozen battery . It may ex­
p lode because of gas trapped in the ice .
Allow a frozen battery to thaw out first.
- Do not reuse batteries wh ich were fro­
zen. The battery hous ing may have
cracked and weakened when the battery
fro ze.
- Cha rge t he battery in a well venti lated
area. Keep away from open flame or elec­
tr ica l spar k. Do not smo ke. Hyd rogen gas
genera ted by the battery is explos ive .
- To reduce the danger of explosion, never
connect or d isconnect charger cab les
while the charger is operating.
- Fast charging a ba ttery is dange rous and
should only be at tempted by a compe­
tent technician with the proper equip­
ment.
- Battery acid tha t may sp ill dur ing cha rg ­
ing should be washed off with a solution
of warm water and baking soda to neu­
tralize the ac id.
(D Note
Neve r use a fast charger as a booster to
start the engine. This wi ll seriously dam­
age sensit ive e lectronic components, such
as contro l units, re lays, radio, etc., as well
as the battery charger.

@ Tips
The vehicle battery must not be charged
with a standard small charger that plugs
into the cigarette lighter or out let.
Windshield/headlight
washer container
F ig . 135 Fen der, left: c over on th e win ds hield and
h ead lig ht· washe r fl uid reservoi r
The washer flu id container is marked with the
symbol
Q on its cap Qpage 166, fig. 128 .
• Before you check anyth ing in the engine
compartment,
always r ea d and h eed all
WARNING S Q .&. in Working in the engine
compartment on page 164 .
• Lift the filler cap tongue to add washer flu­
id. You can fill the container to the top.
• Press the cap back onto the filler neck after
filling the containe r.
You can f ind the rese rvoir
ca paci ty in the tab le
in
~ page 223.
Clean water should be used when fill ing up . If
possib le, use soft water to prevent sca ling on
the washer jets. Always add a glass cleaner solu tion (with fros t protection in the w inter) .
(D Note
-Do not mix engine coolant antifreeze or
any other addi tives to fill up the wind­
s hi eld washer reservo ir.
- Do not use glass cleane rs contain ing
paint solvent; you r isk damaging the
pain t.
Checkin g and fillin g 179

212 Fuses and bulbs
Fuses and bulbs
Electrical fuses
Replacing fuses
Fuses that have blown will have metal strips
that have burned through .
Fig. 159 End face of instrument panel: rem ov ing cover
p la te to access fuses
Fig. 160 Left side of eng ine compart men t: fuse cove r
Fuse cover on the left end face of the
inst rument pane l
.. Switch off the ignition and the electrical
component affected.
.. Carefully pry the fuse cover off the instru­
ment panel using the ignition key or a
screwdriver
c;::> fig. 159 .
.. Check the fuse list ing on the next pages to
find out which fuse belongs to the compo­
nent which has failed
o page 213, Fuse Lo­
cation, Instrument Panel left .
.. Remove the blown fuse with the plastic clip
provided. The cl ip is located on the holder in
the fuse box .
.. Replace a blown fuse (recognizable by the
melted metal str ip ins ide) with a fuse of the
same amperage .
.. Firmly snap the cover back onto the instru­
ment pane l face .
Fuse cover in engine compartment
.. Switch the ignit ion and the affected con­
sumer off .
.. Unlatch the fuse cover , push the two slides
forward
c;::> fig. 160.
.. Find out which fuse belongs to the equip­
ment which stopped working
c;::> page 214,
Fuse location , le~ side of engine compart­
ment .
.. Remove the plastic from its retainer in the
fuse box cover (left face end of the instru­
ment panel), place it on the fu se in question
and pull it out .
.. If the fuse is burned out (recognizable by
melted strips of metal), replace it with a
new fuse
of the same rating.
.. Replace the fuse cover .
.. Push the two slides to the rear
o fig. 160.
Install the fuse cover carefully to prevent
water from enter ing .
The various electrical circuits 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 ratings are available at your author ­
ized Audi dealer.
A WARNING -
Do not repa ir fuses and never replace a
blown fuse with one that has a higher amp
rating. This can cause damage to the elec­
trica l 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
Audi dealer.

216 Emergency situations
Emergency situations
General
This chapter is intended for trained emer­
gency crews and working personnel 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
If necessary, the engine can be started by
connecting it to the battery of another vehi­
cle.
If the engine should fail to start because of a
discha rged or wea k batte ry, the battery can be
connected to the battery o f
another vehicle,
using a
pair of jumper cables to start the en­
g ine .
Jumper cables
Use only jumper cab les of sufficiently
large cross section to safely carry the starter
cur rent. Refer to the manufacturer's specifica­
ti ons.
Use on ly jumper cables which have
insulated
termina l clamps and are properly marked for
d istinction :
plus(+) cable in most cases colo red red
minu s(-) cable
in most cases colo red black .
_& WARNING
Batterie s contain elec trici ty, a cid, and ga s.
Any of th ese c an cause ve ry seri ous or f ata l
inju ry . Follow the instructions below fo r
safe han dling of your ve hicle's battery.
- Alw ays s hield yo ur eyes and avoid lean ­
ing over the batte ry w henever possib le . -
A discharged battery can a lready freeze
at temperatures just be low 32 °F (0 °C).
Before connect ing a jumper cab le, the
frozen battery must be thawed com­
p letely, othe rwise it cou ld explode .
- Do not allow batte ry acid to contact eyes
or skin . Fl ush any contacted a rea wi th
water immediat ely .
- Imp roper use of a booster battery to
s tart a vehicle may cause an explosion.
- Vehicle batter ies generate explosive gas­
es . Keep sparks, flame and lighted ciga­
rettes away from ba tte ries .
- Do not try to jump start a ny ve hicle w ith
a low ac id leve l in the battery .
- The vo ltage of the booster batte ry m ust
a lso have a 12-Vo lt rat ing . The capacity
(A h) of the booster batte ry should not b e
lowe r than that of the discharged bat­
tery . U se o f batt erie s of d iffe ren t voltage
or subs tanti ally diffe ren t "Ah" rat ing
may c ause an exp losion and person al in­
ju ry .
- N ever ch arge a fr ozen bat te ry. Gas t rap ­
ped in the ice may ca use an ex plosion .
- N ever ch arge o r use a batt ery th at has
been fro zen. T he battery case may have
be weakened.
- Us e of batt erie s of di ffere nt vo lta ge or
substan tially differen t ca pa city (Ah) rat ­
i ng may cause an exp losion and injury.
T he capac ity (Ah) of the booster battery
should not be lower than that of the dis­
charged batte ry.
- Before you check anything in the engine
compartment, always read and heed a ll
W ARNI NGS
c::;,page 164, Working in the
engine compartment .
@ Note
-App lying a hig her voltage booster ba t­
tery will cause expens ive damage to se n­
sitive electronic components, such as
cont ro l units , relays, rad io, etc.
- There must be no electrical contact be­
twee n the vehicles as otherwise current
cou ld already start to flow as soo n as th e
posi tive (+) term inals are connect ed. ""

218 Emergency sit uat ions
instructions of the jumper cable
manufacturer. If in doubt, call for road
service.
- Jumper cables must be long enough so
that the vehicles do not touch.
- When connecting jumper cables, make
sure that they cannot get ca ught in any
moving parts in the eng ine compart­
ment.
- Before you check anything in the engine
compartment, always read and heed all
WARNINGS
¢ page 164, Working in the
engine compartment.
@ Note
Improper hook-up of jumper cables can ru­
in the generator.
- Always connect POSITIVE(+) to POSI­ TIVE(+), and NEGATIVE( -) to NEGATIVE
( - ) ground post of the battery manager
control unit.
- Check that all screw plugs on the battery
cells are screwed in firmly . If not, tighten
plugs prior to connecting clamp on nega­
tive battery terminal.
- Please note that the procedure for con­ nect ing a jumper cable as desc ribed
above applies spec ifically to the case of
you r vehicle being j ump s tarted. When
you are giv ing a jump star t to anothe r ve­
hicle, do
not connect the negat ive (-) ca ­
ble to the negative(-) terminal on the
discharged battery ©- Instead, securely
connect the negative(-) cable to either a
solid metal component that is firmly
bo lted to the engine block or to the en­
gine block itself. If the battery that is be­
i ng charged does not vent to t he outside,
escaping batte ry gas cou ld ig nite and ex­
plode!
Emergency towing
with commercial tow
truck
General hints
Your Audi requires special handling for tow­
ing.
T he following information is to be used by
commercial tow truck operators who know
how to operate their equipment safely.
- Nev er tow your Audi , towing will cau se
damage to the engine and tr an smi ssion .
- Ne ver wrap th e safet y chain s or winch ca­
ble s ar ound the brak e lines.
- To prevent unne ces sary damage , your Audi
must be tran sp o rt ed with a car carrier
(flatbed truck ).
- To load th e vehi cle on t o the flat bed , u se
the t owing loop found in t he vehicle tools
and attach to the front o r rear ancho rage
¢page 219 and ¢page 220 .
A WARNING
-A vehicle being towed is not safe for pas-
sengers. Never allow anyone to ride in a
vehicle be ing towed, for any reason.
-