2009 AUDI TT COUPE differential

Instruments and warning/indicator lights
& W ARN ING (continued )
increased br aking dist ances . Trying to brake as quickly as usual
c ould lead to an a ccident. •
Anti-lock brake system , e (USA)/
(Canada)
T his war ning/ indic ator ligh t moni to rs the AB S and the
elect ronic diffe ren tial lock (EDL).
The J light wil l come on for a few seconds when the ignition is
swi tc hed on. The light w ill go out aft er a n aut omat ic check seque nce
is completed.
There is a malfunction in the
ABS when :
• T he warning/indicator light does not il luminate when you switch
on the ign ition.
• T he wa rning/indicator light does not go out after a few seconds.
• The wa rnin g/ind ica tor light il luminates wh ile driv in g.
The brake system will still respond even without the assistance of
the ABS system. See your authorized Audi dealer as soon as poss ible to restore full braking performan ce . For more information
regard ing the ABS ~ page 187.
The ABS warning light and the brake warning light come on
together . The ABS will not work and you will notice a change in
braking response and performance .
Malfunction in the brake system USA models: If both, t he
BRAKE warning light and the ,,[ warning
light co me on ~ page 79when the pa rking b ra ke is r eleased, there
may be a mal function in t he ABS , and t here may also be a malfunc­
tion in the brake system itself ~ & .
Canada model s: If bo th, the b rake warn ing l ig ht
(Ci) and the ABS
warning light : come on~ page 79when the parking brake is released, there may be a malfunction in the ABS, and there may also
b e a ma lfunc tio n in t he b rake system itself~ & .
Malfun ction in the electronic differential lock (EDL )
T he two sys te m s ED L and ABS w ork together . The L warning ligh t
wi ll come on if there is a malfunction in the EDL system~ page 184.
See you r au thori zed A udi deale r as so on as possible.
& WARNING
• If the "warning light does not go out , or if it comes on while
driving , the ABS system is not working properly . The vehi cle can
then be stopped only with the brakes operating without ABS support . You will not have the protection ABS provides . Contact
your Audi dealer as soon as possible.
• USA models : If both , the
BRAKE w arning light and the
warning light come on at the same time, the rear wheels could lock up first under hard braking . Lock-up of the rear wheel brakes
can cause loss of vehicle control and an accident . Have your
vehicle repaired immediately by your authorized Audi dealer or a
qualified workshop. Drive slowly and avoid sudden, hard brake
appli cation .
• Canada models: If both, the brake warning light CCI» and the ABS
warning light come on at the same time , the rear wheels could
lock up first under hard braking. Lock -up of the rear wheel brakes
c an cause loss of vehi cle control and an a ccident . Have your
vehicle repaired immediately by your authorized Audi dealer or a
qualified workshop. Drive slowly and avoid sudden , hard bra ke
application •
Electro-mechanical power assist l / @
If the indicato r light i lluminates while you a re d riv ing, t here i s a
malfunction in the e lectro -mechanica l steering . If the indicator light
is showing , there may be a reduction in powe r stee ring assist. If
t h e ind icator light is show ing® , there may be a total loss o f power
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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 187. 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
187, 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 .
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