brake sensor AUDI TT ROADSTER 2008 Owners Manual

Driver information system
[ i] Tips
• The engine oil pressure symbol 9:::r. is not an indicator for a low
engine oil level. Do not rely on it. Instead, check the oil level in your
engine at regular intervals, preferably each time you refuel, and
always before going on a long trip.
• The yellow oil level warning indication · requires oil refill or
workshop service without delay. Do not wait until the red oil pres­
sure warning symbol
9:::r. starts to flash before you respond to the
low oil level warning . By then, your engine may already have
suffered serious damage. •
Yellow symbols
A yellow symbol means WARNING.
Yellow symbols mean:
Low fuel level
Check engine oil level Engine oil sensor malfunction
-
Worn brake pads
USA models:
Speed warning 1
Canada models:
Speed warning 1
-
USA models:
Speed warning 2
-Canada models:
Speed warning 2 =>
pag
e35
=> page35
=> page35
-
=> page35
=> page35
=> page35
=> page35
-
=> page35
Dynamic headlight range con­
trol* defective => page35
Windshield washer fluid level low
=> page 35
Battery voltage too high or too
low
Defective light bulb
USA models:
Defective brake light
Canada models:
Defective brake light =>
page35
=> page36
=> page36
=> page36
Light/rain
sensor defective (auto-=> page 36
matic headlights) * defective
Adaptive Light* defective =>
page 36
Tire pressure monitoring system * => page 37
Yellow symbols indicate a priority 2 malfunction -Warning!
When a yellow symbol appears, a warning tone will sound
once .
Check the displayed function as soon as possible . If more than one
priority 2 malfunction is detected, all symbols will appear one after
the other for about two seconds.
To display driver information
As an example, the[} symbol appears in the display . If you now
press the button =>
page 12, fig. 2 ©, the following driver message
appears in the display:
PLEASE REFUEL
The driver message in the display goes out after about 5 seconds.
You can display the driver message again by briefly p ressing the
button. •

Fuel supply too low [J
When the J symbol illuminates, this means there is about 1.8
gal lons
(7 l iters) o f fue l left in the fuel ta nk. T ime to re fuel!
=>
page 275.
I f the symbo l lights up, even when there is ample fuel in the tank,
and the text
TANK SYSTEM MA LFUN CTION! CON TACT WORKSHOP
appears in the display, there is a fau lt in the system. Contact a qual ­
ified workshop to have the fau lt rectified. •
Checking the engine oil level _,;.
When the -= symbol illuminates, check the engine oil leve l as soon
as possib le =>
page 224. Top off the oil at your ear liest opportun ity
=>
page 225. •
Engine oil sensor defective
-
If the _ symbol illuminates, contact your authorized Audi dealer
and have the oil sensor inspected . Unti l you have this done, check
the oi l leve l each time you re fue l jus t to be on the sa fe s ide
=>
page 224 . •
Worn brake pads .)
If the symbo l illuminates, contact your authorized Audi dea ler to
have the front bra ke pads inspected (on that occasion have the rear
brakes inspected as wel l to be safe). •
Controls and equip ­
ment
Driver inform ation system
Speed warning 1
~ (USA models) / ~ (Canada
models)
I f the ~ symbo l illuminates, this means you are d riving faste r than
the set vehicle speed . Slow down!=>
page 37. •
Speed warning 2
-.... (USA models) /
l.,... (Canada models)
If the C) symbol il luminates, this means you have driven faster than
the sec ond set vehic le s peed. Slow d own! =>
page 37. •
Applies to veh icles : wi th dynami c he ad light r ange ad just ment
Headlight range control defective
If the il luminates, the dynamic head light range control is no
longer working pr ope rly. Have the syste m checked and repa ired at
your authorized Audi dea ler .•
Windshield washer fluid level too low .-_j
If the ~ symbol illuminates, add windshie ld washer fluid to the
washer sys tem =>
page 236 . •
Battery voltage low ~
If the C sy mb ol illu min ates, co ntact your au thori ze d Audi dealer
and have the following components inspected:
• drive belt
• generator
• b att e ry charge
I • •

Driver information system
Also see if the generator warning/indicator light illuminates
=> page 19. •
Defective light bulb warning
The defective light bulb warning tells you when a vehicle
light bulb has become defective.
If a defective bulb has been detected by the system or a light bulb
burns out, the symbol with a message appears in the display to
tell you which bulb is burnt out and where it is located. For example:
REAR LEFT TURN SIGNAL
After 5 seconds, the message disappears. If you want to recall the
message into the display, press the CHECK button.
There are three reasons why the defective bulb message would appear in the display:
• the light bulb has burnt out=> page 277.
• the fuse is "blown" => page 273, "Replacing a fuse".
• the wire connection to the light bulb is defective.
Have the bulb replaced or the connection repaired by your autho ­
rized Audi Service department.
& WARNING
• Light bulbs are pressurized and could explode while they are
being changed causing serious personal injury.
• Work with due care when handling the high-voltage section of
gas discharge (xenon) lamps*. Failing to do so could result in death
or serious injury! •
Brake light defective K: U (USA
models) / (Canada models)
In case of a malfunction or component failure, the acoustic warning
will sound and the symbol&;
l[ (USA models)/ (Canada
models) can appear.
The following electrical components should be checked, repaired or
replaced, as necessary :
• Brake light bulbs
• All wiring connections
• Brake light switch
Contact your authorized Audi dealer for assistance if necessary.
[ i] Tips
The brake light switch is only inspected as part of the functional
check after the engine is started. •
Applies to vehicles: with automat ic headlights and rain sensor
Light /rain sensor defective >
AUTOMATIC HEADLIGHTS/AUTOMATIC WIPERS DEFECTIVE
If the symbol illuminates, the light sensor has failed. For safety
reasons the low beams are turned on permanently with the switch
in
AUTO. However , you can continue to turn the lights on and off
using the light switch. In the case of a defect in the rain sensor, the
windshield wiper lever functions are still available. Have the
light /rain sensor checked as soon as possible at a dealership. •
Applies to veh ic le s: w ith Adaptive Light
Adaptive Light defective
ADAPTIVE LIGHT DEFECTIVE
•
'

_________________________________________________ O .=.:.n.:....: t~h :.::e ::....:.. r.::o :.::a :.:d::...__lfflll
- Wit h a manual transm issi on, engage 1st gea r, or with a n
a utomatic transmission place the se lector lever in P
=> & .
- Remove the ignition key from the ignit io n lock.
Wha t el se you should do wh en parking yo ur v ehi cle on
a n incli ne or d ecline
Turn the steering whee l so that if the vehicle shou ld start to rol l, it
wi ll roll into the curb.
I f you are park ing on a
decline (the front of you r ve hicle facing
downhill) , turn the front wheels to the right so that they poin t
toward the curb .
If you are park ing on an in cline (the font of your vehicle facing
uphill!, turn the front whe els to the left so that they point
away from
the curb .
& WARNING
This is how you can reduce the ri sk of injury when le avi ng your
vehicle .
• Never p ark the vehi cle w here it can come
in cont act w ith dry
gra ss, s pilled fuel or any other flammable mater ial s.
• Never allow anyone -espe cially small ch ildren -to remain
in the
vehicle when it is locked . Locked doors make it more difficult for
re scu ers to ac ce ss the pa ssenger compartment in the e vent of an
emergency . Danger to life!
• Never lea ve childr en un super vis ed in the vehicle . Children
c ould release the parking brake or move the gearsh ift l ever out of
gear . The vehicle could start to r oll away a nd cau se an a ccident .
• No matter what the season i s, the temperature
in a parked
v ehi cle can reach dangerou s level s. •
Controls and equip ­
ment
Acoustic parking system
A pplies to veh ic les : wit h 4 -ch anne l a cou stic park ass is t
Rear acoustic park assist
Acoustic park assist gives a warning a bout o bstacles
behind the vehicle.
Description
The rear acoustic park assist (4 -channel acoustic park assist) deter ­
mines the d istance of the vehic le from an obstac le using u ltrasonic
sensors. The sensors are in the rear bumper. The volume and the
pitch of the chimes can be adjusted through the menu display
=> page 27.
The range at which the sensors start to m easure is about :
To the side
Center rear
Acti v atio n
2 feet (0 .60 m)
5 feet (1.60 ml
The pa rking assist is activated when rever se ge ar is engaged . A brief
tone confirms that the system is activated .
Backing up
Distance warning when backing up starts when an obstacle is
detec ted in the range of the park ass ist system . As the distance
decreases, the time interval between the aud ible tones becomes
shorter .
When the distance is less than 1 foot (0.30 m) , the tone becomes
continuous . At this point you should stop backing up.
Please note that low objects a lready signalled by a warning can
disappear from the sys tem's detection range and wil l not continue
t o be signa lled . ..,
I • •

_1--_l_ n _t _ e _ll _,ig ,_,_ e_n _t _ t_ e_ c_ h_n _o_ l_ o ~g""- y.e- __________________________________________ _
Intelligent technology
Notice about data recorded by
vehicle control modules
Your vehicle is not equipped with an Event Data Recorder (EDR),
installed by some manufacturers for the express purpose of
capturing data for retrieval after an accident or crash event . EDR's
are sometimes called "crash recorders".
Some state laws restrict the retrieval or downloading of data stored
by EDR's that were installed in a vehicle for the express purpose of
retrieving data after an accident or crash event w ithout the owner's
consent.
Although your vehicle is not equipped with an EDR, it is equipped
with a number of electronic control modules for various vehicle systems such as, for example, engine function, emission control, as
well as for the airbags and safety belts.
These electronic control modules also record vehic le-related data
during norma l vehicle opera tion for diagnostic and repair purposes .
The recording capacity of the electronic control modules is limited
to data (no sound is recorded) and only a small amount of data is
actually recorded over a very limited period of time and stored when
a system fault or other condition is sensed by a control unit. Some
of the data then stored may relate to vehic le speed, direction,
braking as well as restraint system use and performance in the
even t of a crash or other condition . Stored data can only be read and
downloaded with special equipment.
Electronic Stabilization Program (ESP)
Genel'61
The Electronic Stability Program increases driving
sta bility.
Fig . 142 Cente r
cons ole with ESP
sw itch
With ESP, control over the veh icle is increased in situations when
the vehicle is close to the limits of grip, such as during acce leration
and in curves. ESP reduces the risk of skidding a nd improves vehicle
stability under all road conditions . It operates at all speeds .
The Anti-Lock Brake System (ABS), E lec tronic Differentia l Lock (EDS)
and Anti-Slip Regulation System (ASR) are integrated in the Elec­
tronic Stability Program .
H ow ESP work s
The ESP control unit processes the following data from high-sensi ­
tive sensors: the rotational speed of the vehicle about its vertica l
axis, fore -and -aft and lateral acceleration forces, brake pressure and
steering angle.
Using steering ang le and vehicle speed, the direction the driver
wishes to travel is determined and continuously compared with
actual vehicle behavior . If the two do not match, for example when

___ ln_ t _e_ ll-'"ig ...,_ e_ n_t _t_ e_ c_ h _ n_o _ l_o _,.g= y,_ __________________________________________ _
Electronic differential lock (EOL)
The electronic differential lock monitors the rotational
speed of the drive wheels.
General notes
The electronic differential lock (EDU helps the car to start moving,
accelerate and climb a gradient on surfaces providing poor or
almost no grip. Without EDL, this would be difficult, if not impos ­
sible.
How the system works
Th e EDL operates automatically. It monitors the rotational speed of
the drive wheels on an axle with the help of the ABS sensors
=> page 189. If a noticeable difference in rotational speed between
the drive wheels on one axle is detected (e.g. on slippery ground
on
one side),
the spinning wheel is braked, thereby transferring power
to the other drive wheel or wheels (all-wheel drivel. This is done up
to a speed of about 60 mph (100 km/hl. Noises from the brake
system signal that wheel spin is being controlled.
Driving off
When driving off, always be sure to keep road conditions in mind as
you accelerate . If one drive wheel spins because it is on a surface
with less grip, gradually increase the pressure on the accelerator
pedal until the car starts to move. The wheel less able to transfer
power spins.
Overheating of brakes
To prevent the disc brake of the braked wheel from overheating if
subjected
to excessive loads, the EDL cuts out temporarily . The
vehicle remains operational and behaves in the same way as a
vehicle without EDL.
As soon as the brake has cooled down, EDL switches on again auto­
matically.
& WARNING
• When accelerating on slippery surfaces, such as on ice or snow,
always be careful when depressing the accelerator pedal. Even
with the EDL working, the drive wheels can spin and reduce your ability to control your car. -Risk of crash!
• The increased safety afforded by EDL does not mean that you
can take safety risks. Always adapt your driving style to the road
conditions and traffic situation.
[ i] Tips
If a fault occurs in the ABS, the EDL is also not functioning . This is
indicated by the ABS warning light=>
page 20. •
Anti-Slip Regulation System (ASR)
The Anti-Slip Regulation System prevents the driven
wheels from spinning when the car is accelerating.
General notes
The Anti-Slip Regulation System (ASR) is integrated in the electronic
stabilization program (ESP). When the vehicle starts up and acceler ­
ates , the wheels are prevented from spinning by adjusting the
engine power to match the amount of grip available from the road
surface .
How the system works
ASR performs automatically, i.e. without the driver's intervention .
With the aid of the ABS sensors =>
page 189, ASR monitors the
speed of the driven wheels. If the wheels start to spin, the engine
torque is reduced automatically until the tires find enough grip to
lock onto the road surface . The system is active across the entire
speed range.
The ASR works in conjunction with the ABS. If a malfunction should
occur in the ABS, the ASR will also be out of action .
~

-Tires and wheels
P'tr:1-------------------
will not work prope rly . In this case, the tire pressure monitoring
s ys tem would n ot b e ab le to mon itor the tire p ressure or wa rn yo u
if it is necessary .
• The battery inside of the tire pressure sensor has a limited
se rvice life .
• Always d rive with the valve stem caps sec urely mounted . We
recommend using factory insta lled valve stem caps . Ask your au tho ­
rized Audi dealer to replace lost va lve stem cap s.
The installation o f rep laceme nt tire s wi th steel cor d body p lies in
the tire sidewal l may cause malfunction of the tire pressure moni ­
t or ing sys tem, a nd is no t re com mended (cord mater ial i nformat ion
in molded on the tire sidewa ll) .
A lw ays check your tire p ressure monito rin g s ystem i ndicator afte r
replacing o ne or mor e tir es o n you r vehi cle. If th e tire p ressu re
monito ring syste m indicat or flashes, o r is on, you r sy stem is not
wo rk in g pr oper ly. Your rep lac em ent ti re mig ht be i nco mpat ibl e wi th
your tir e pressure monitoring syst em , or som e component o f th e
tir e pr ess ure monito ring syste m may be da mag ed.
& WARNING
• Using incorrect or unmatched tires and/ or wheels or improper
tire and wheel combinations can lead to loss of control, collision
and serious personal injury .
• Always use tires , rims and wheel bolts that meet the specifica­
tions of original factory -installed tires or other combinations that
have been spe cifically approved by the vehicle manufacturer.
• Tires age even if they are not being used and can fail suddenly ,
especially at high speeds . Tires that are more than 6 years old can
only be used in an emergency and then with special care and at
lower speeds .
• Never mount used tires on your vehi cle if you are not sure of
their "previous history. " Old used tires may have been damaged
even though the damage cannot be seen that can lead to sudden
tire failure and loss of vehi cle control.
& WARNING (continued)
• All four wheels must be fitted with radial tires of the same type,
size (rolling circumference ) and the same tread pattern. Driving
with different tires reduces vehicle handling and can lead to a loss
of control.
• If the spare tire is not the same as the tires that are mounted
on the vehicle -for e xample with winter tires -only use the spare
tire for a short period of time and drive with extra care . Refit the
normal road wheel as soon as safely possible.
• Never drive faster than the maximum speed for which the tires
on your vehicle are rated because tires that are driven faste r than
their rated speed can fail suddenly .
• Overloading tires cause heat build-up , sudden tire failure ,
including a blowout and sudden deflation and loss of control .
• Temperature grades apply to tires that are properly inflated and
not over or underinflated .
• For te chnical reasons it is not always possible to use wheels
from other vehicles -in some cases not even wheels from the
same vehicle model.
• If you install wheel trim discs on the vehicle wheels, make sure
that the air flow to the brakes is not blocked. Redu ced airflow to
the brakes can them to overheat , increasing stopping distances
and causing a collision.
• Run flat tires may only be used on vehicles that were equipped
with them at the fa ctory . The vehicle must have a chassis designed
for run flat tires and a factory -installed tire pressure monitoring
system that indi cate s a loss of tire pressure . Incorre ct use of run
flat tires can lead to vehicle damage or accidents . Check with an
authorized Audi dealer o r tire specialist to see if your vehicle can
be equipped with run flat tires .
If run flat tires are used, they must
be installed on all four wheels . Mixing tire types is not permitted. .,

Fuses and bulbs -
----------------
Equipment No. Equipment
Amps
Engine relay, fuel tank control unit, Airbag Off
16 A/C system (control unit) 10
1
light, light switch (switch illumination), diagnos-10
tic connector
17 Tire pressure monitoring system (control unit) 5
18
Not used
ABS, ASR, ESP, brake light switch
5 19
Not used
3 AFS headlight (left) 5
Not used
Oil level sensor (extended maintenance interval)
(WIV), tire pressure monitoring system, switch
21 Fuel injectors (gasoline engine) 10
4 for Electronic Stability Program (ESP), AFS head-5 Wind deflector (Roadster) 30
lights (control unit), A/C system (pressure sen -23 Horn 20 sorl, backup light switch
Automatic headlight range control, AFS head-
24 Transmission (control unit) 15
5
light (right)/ manual headlight range control, 5/10
25 Heater rear window Coupe/heated rear window 30/20
halogen headlights Roadster
Control unit for CAN data transfer (gateway),
26 Driver's side power window 30
6 electromechanical steering, automatic transmis-5
27 Passenger's side power window 30
sion shift gate
28 Not used
Acoustic Park Assist, automatic dipping interior
rear view mirror, garage door opener, heatable
29 Washer pump 15
7
windshield washer nozzles, washer pump, wind 5
30 Cigarette lighter 20
deflector relay (Roadster)
31 Starter 40
8
Haldex clutch 5 32 Steering column module 5
9
Control unit Audi magnetic ride 5 33
Instrument cluster 5
Airbag control unit 5 34 Radio navigation system, radio 15
1 1 Mass airflow sensor, crankcase heating 5/10
35
Audio amplifier 30
12 Door control unit (central locking driver/passen-10
36 Engine (control unit) 10 ger)
13 Diagnostic connector 10 37 CAN (Gateway) 5
Rain sensor, automatic transmission shift gate 5 38 Not used
15 Roof
light (interior lighting) 5 39 Not used
• Do-it
-yourself service

______________________________________________ A_ l_,_ p _h_ a_ b_e _t_i c_ a _ l _in _ d_e _ x __ lllll
Dimensions ... .. ...... . .... .. .. .... 290 Electronic differential lock (EDU
Dipstick Reading the dipstick properly
Direct Shift Gearbox 224
Emergency release . . . . . . . . . . . . . . . 120
Distance ........ .... ....... ...... ... 40
Driver information system . .... .... ... . 22
Digital speedometer ... .. .... ...... 24
Fuel filler cap ...... ..... .... .... .. 24
Menu button ..................... 28
Menu display ..................... 27
Open door or rear lid warning . ......
24
Outside temperature display .. .... .. 23
Parking brake warning ............. 30
red symbols .. ............. ....... 31
Setting ...... .... ... .... ..... .. .. 28
Sound system disp lay ............ .. 23
Text messages . .... .... .... .... ... 30
Driver seat See Seating position . ............. 130
Driving Run -flat tires . .... .... ....... .... . 258
Dr iving messages ... ..... .. ... .... ... 30
Driving safely . . . . . . . . . . . . . . . . . . . . . . . 128
Driving time ... .... ... ..... .... .... .. 39
Duplicate key .... .... ...... ....... ... 47
Dust filter . ....... .... .... ........ ... 99
E
Electro -mechanical power assist ... 21, 190 How the system works
............ 186
Warning/indicator lights ............ 20
Electronic immobilizer ...... ... .. .. 14, 49
Electronic power cont ro l
EPC warning/indicator light ..... .... 17
Electronic Stability Program .......... 184
Electronic stabilization program (ESP! Warning/indicator lights ........ .... 18
Emergency flasher Warning/ind icator lights .. .... ...... 19
Emergency flashers .................. 75
Emergency locking . ... .... .... ... .. .. 54
Emergency operation Folding top ....................... 64
Rear lid .. .... ....... .... .... .... . 56
Emergency release for selector lever ... 120
Emergency starting ........ ... .... ... 278
Emergency towing .. ............. .. . 281
Engine Cecking and filling locations ... ... . 222
Checking and filling locations ...... 221
Coolant ... .. .... .... ..... .. ... .. 227
Hood . ..... .. ... ... .. .... ..... .. 219
Starting ..................... 106, 107
Starting with jumper cables ........ 278
Stopping .... .... ...... ...... ... . 107
Engine compartment .... ...... ...... 221
Safety instructions ................ 220
Working in the engine compartment 220
Engine coolant sys tem ..... .... ...... 227
Adding coolant .... .... ..... ... ... 228
Checking the engine coolant leve l .. . 228 Radiator fan
... .. .. .. .... .... .... 229
Temperature gauge ................ 13
Engine cooling system Malfunction ... .. .... .... .... ..... 32
Engine data .. ............... .... ... 291
Engine hood Closing .. ... ........ .... ... ..... 220
How to release the hood ... ... ... .. 219
Engine oil . ...... .... .... ... .... .... 222
Adding .... ....... .... ... .... .... 225
Additives .. .... .... ... .... .... ... 225
Changing . .... .... .... ..... ..... . 226
Checking the engine oi l leve l ... .... 224
Indications and conditions requiring extra checking .... .... .... .... .... ... 224
Oil consumption . ...... ..... .. .... 224
Oil grades . ....... .... .... ....... 222
Pressure malfunction .............. 33
Recommended oil check intervals ... 224
Specification and viscosity ......... 222
Engine oi l leve l .. .... .... ... .... .... . 35
Engine oil sensor defective .... ...... .. 35
Environment Break-in period ..... .. ... .... .... . 192
Catalytic converter .......... ... .. . 193
Disposing of your vehic le battery .. . 231
Driving at high speeds . ...... .... . 194
Dr iving to minim ize pollution and noise .
194
Fuel .. .... .... .... ... .... .... ... 216
Fuel economy ......... ........ ... 194
Leakage from your vehicle . .... .... 220
Letting the vehicle stand and warm up ..
195
Controls and equip­ ment Safety first Vehicle operation
Vehicle care Do-it-yourself service Technical data