check engine AUDI TT ROADSTER 2016 Service Manual

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system
Description of airbag
system
General notes on airbag system
The airbag is an integral part of the car&#39;s passive
safety system.
In conjunction with the seat belts, the airbag sys­
tem gives the front occupants additional protec­
tion for the head and chest in the event of a se­
vere frontal collision.
In a severe side collision the side airbags reduce
the risk of injury to the occupants ¢,&..
In addition to their normal function of protecting
the occupants in a collision, the seat belts also
hold them in a position where the airbags can in­
flate properly and provide maximum protection.
The airbag system will only work with the igni­
tion on. The airbag system is monitored electron­
ically; the indicator lamp m indicates whether
the system is functioning properly.
The main parts of the airbag system are:
- The electronic monitoring system (control unit
and sensors)
- The two front airbags
- The two side airbags
- The indicator lamp El in the instrument cluster
There is a fault in the airbag system if the
warning lamp
- does not come on when the ignition is switched
on.
- does not go out about 4 seconds after the igni­
tion is switched on.
- goes out and then comes on again after the ig­
nition is switched on.
- comes on or flickers while the car is moving.
A WARNING
- The airbags are not a substitute for the seat
belts; they are an integral part of the car&#39;s
overall passive safety system. The airbags
can only offer effective protection if the oc­
cupants are wearing their seat belts. For Airbag
system
this reason it is very important to wear the
seat belts at all times ¢ page 230, Why is it
so important to use seat belts?.
- The seat belts and airbags can only provide
maximum protection if the occupants are
seated correctly ¢ page 54, Front seats.
- If you do not wear a seat belt, if you lean
forward, or are not seated correctly while
the vehicle is in motion, you are at greater
risk of injury should the airbag system be
triggered in an accident.
- Components of the airbag system are loca­
ted in various parts of the vehicle. If repairs
to other vehicle components make it neces­
sary to perform work on the airbag system
or to remove or install parts of the airbag
system, this may cause damage to the air­
bag system. As a result, the airbags may not
inflate correctly or may not be triggered at
all in an accident situation. For this reason,
you should always have the work carried out
by a qualified workshop.
- If a fault should occur in the airbag system,
have the system checked immediately by a
qualified workshop. Otherwise the system
may fail to trigger in an accident.
- Do not attempt to modify components of
the airbag system in any way.
- Never make any alterations to the front
bumper or the body.
- Do not remove the seats.
- The airbag system can only be activated
once; if the airbag has been triggered, the
system must be replaced. Should the airbag
system or airbag modules have to be re­
placed, the qualified workshop carrying out
the replacement will document all details.
- If any repair work is required or the airbag
and restraint systems have to be replaced,
have the work carried out by your authorised
Audi dealer or a qualified workshop which
adheres to the Audi factory standards. This
will minimise the risk of injury.
- If you sell the vehicle, remember to pass on
the complete Service Wallet to the new
owner. If any of the airbags have been deac­
tivated, it is important that the new owner
is also given the relevant documents.
..,.
235

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and topping up
fluids
Fuel Petrol grade
Applies to: vehicles with petrol engine
The correct grade of petrol is Listed inside the
fuel tank flap.
The vehicle is equipped with a catalytic converter
and must only be run on unleaded petrol. Petrol
must be sulphur-free and must comply with the
EN 228 standard. You can fuel your vehicle with
fuels containing a maximum of 10% ethanol
(ElO). The petrol grades have different octane
ratings (RON).
The following headings relate to the sticker on
the inside of your vehicle&#39;s tank flap:
Unleaded fuel only RON/ROZ 95 Super,
Premium or min. RON/ROZ 91 Normal
The use of premium petrol (95 RON) is recom­
mended. If that type of fuel is not available, reg­
ular petrol (RON 91) can be used with a slight
loss of power.
Unleaded fuel only, min. RON/ROZ 95
Super, Premium
Premium petrol (at least 95 RON) must be used.
If premium petrol is not available, the engine can
be run on regular petrol with 91 RON as an emer­
gency measure. In this case only use moderate
engine speeds and a light throttle. Fill up with
premium or Super Plus petrol as soon as possi­
ble.
Unleaded fuel only RON/ROZ 98 Super Plus
or min. RON/ROZ 95 Super, Premium
The use of Super Plus petrol (98 RON) is recom­
mended. If that type of fuel is not available, pre­
mium petrol (RON 95) can be used with a slight
loss of power.
If premium petrol is not available, the engine can
be run on regular petrol with 91 RON as an emer­
gency measure. In this case only use moderate
engine speeds and a light throttle. Fill up with Checking
and topping up fluids
premium or Super Plus petrol as soon as possi­
ble.
CD CAUTION
- Do NOT fuel your vehicle with high-ethanol
fuel blends (e.g. ESQ or E85). This will dam­
age the fuel system.
- Just one tank of leaded fuel or fuel with
metallic additives will permanently impair
the efficiency of the catalytic converter.
- You should use only petrol additives which
have been approved by Audi. Additives with
so-called octane boosters or antiknock addi­
tives can contain metallic additives that
cause significant damage to the engine and
the catalytic converter. Do not use such ad­
ditives.
- Metal-based fuels, which can be identified
from the marking on the fuel dispenser,
must not be used. LRP fuel (lead replace­
ment petrol) also contains high concentra­
tions of metallic additive. Risk of engine
damage!
- High engine speed and full throttle can
damage the engine when using petrol with
an octane rating lower than the correct
grade for the engine.
((D Note
- You can use higher octane fuel than your en­
gine requires.
- In countries where sulphur-free fuel is not
available, you may use low-sulphur fuel in­
stead.
Diesel fuel
Applies to: vehicles
with
diesel engine
Please note the information on the inside of the
fuel tank flap.
The use of sulphur-free diesel complying with
the EN 590 standard is recommended.
Diesel can thicken at very low temperatures,
which can result in problems starting the engine
or prevent the engine from running smoothly.
For this reason, filling stations in some countries
offer winter-grade diesel fuel during the cold 1)11,,
241

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and topping up fluids
months so that you can continue to operate your
vehicle reliably. Ask at your filling station wheth­
er the diesel fuel available there is suitable for
the current conditions and for the temperatures
which could potentially occur.
CD CAUTION
- Never use FAME fuels (biodiesel), petrol,
heating oil, thinners or any other fuels or
additives, as these could cause serious dam­
age to the fuel system and the engine.
- Never start the engine if you fill up with the
wrong type of fuel, as this could damage
the fuel system and the engine. Obtain pro­
fessional assistance.
Filling the tank
Procedure for filling the tank
Fig. 207 Vehicle as seen from the rear right: Opening the
fuel tank flap .,..
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Fig. 208 Vehicle as seen from the rear right: Inserting the
filler nozzle
The fuel tank flap is unlocked and Locked auto­
matically by the central Locking system.
... Press
the tank flap -arrow- ¢ Fig. 207 to open
it. Your vehicle has a new self-sealing fuel tank
without a tank cap.
242 ...
Insert the filler nozzle into the fuel filler neck
as far as the stop ¢ Fig. 208 and ensure it is
properly engaged .
... Start refuelling. When the automatic filler noz­
zle is operated correctly it will switch itself off
as soon as the tank is full. Do not try to put in
more fuel after the nozzle cuts out, as this will
fill the expansion chamber in the fuel tank.
.., When the fuel filler pump switches itself off,
wait for 5 seconds before pulling out the filler
nozzle so that any remaining fuel can flow into
the tank opening.
... Close the tank flap. Make sure you hear it click
into place.
The correct fuel grade for your vehicle is given on
a sticker on the inside of the tank flap. Further
notes on fuel ¢ page 241.
The tank capacity of your vehicle is given in the
Technical data section ¢ page 288 .
A WARNING
Fuel is highly inflammable and can cause seri­
ous burns and other injuries.
- When filling your tank or a spare fuel canis­
ter with fuel, do not smoke and keep away
from naked flames -risk of explosion!
- Observe all relevant statutory regulations
on using, storing and transporting spare
fuel canisters.
- For safety reasons we do not recommend
carrying a spare fuel canister in the vehicle.
The canister could become damaged in an
accident and Leak.
- If, in exceptional circumstances, you have to
carry a spare fuel canister, please observe
the following warnings:
- Never fill fuel into the spare fuel canister
with the canister placed in or on top of the
vehicle. An electrostatic charge could
build up during filling, causing the fuel va­
pour to ignite -risk of explosion! Always
place the canister on the ground to fill it.
- Insert the filler nozzle as far as possible
into the spare fuel canister .
- If the spare fuel canister is made of metal,
the filler nozzle must be in contact with �

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canister during filling. This helps
prevent an electrostatic charge building
up.
- Make sure you never spill fuel in the vehi­
cle or in the luggage compartment. Fuel
vapour is explosive -danger to life!
CD CAUTION
- If any fuel is spilt onto the vehicle, it should
be removed immediately as it could other­
wise damage the paintwork.
- Never run the tank completely dry. If there
is an irregular fuel supply, misfiring can oc­
cur. As a result unburnt fuel can enter the
exhaust system and cause damage to the
catalytic converter(s).
- When filling the fuel tank after having run it
completely dry on a vehicle with a diesel en­
gine the ignition must be switched on for at
least 30 seconds without starting the en­
gine. When you then start the engine it may
take longer than normal (up to one minute)
for the engine to start firing. This is because
air needs to be bled from the fuel system
while starting.
@) For the sake of the environment
Do not try to put in more fuel after the auto­
matic filler nozzle has switched off; this may
cause the fuel to overflow if it becomes warm.
@ Note
Should the fuel tank flap become frozen stuck
during inclement weather, press the middle
of the flap with the palm of the hand and try
again.
(ill) Note
- To prevent the tank from being filled with
the incorrect type of fuel, only suitable filler
nozzles can be inserted in the fuel filler on
your vehicle.
- If the filler nozzle is old, damaged or too
small, it may not be able to open the pro­
tection mechanism on the fuel tank. In this
case, try turning the filler nozzle before in­
serting it in the fuel filler neck, use a differ- Checking
and topping up fluids
ent filling pump or seek professional assis­
tance.
- The protection mechanism will not open if
you try to add fuel from a spare fuel canis­
ter. If you need to fill the tank from a spare
fuel canister, you must use the special fun­
nel stowed in the luggage compartment
¢page 243, Fig. 209.
Filling the tank using a spare fuel canister
Fig. 209 Luggage compartment: Funnel
Fig. 210 Funnel inserted in tank opening
Please refer to the important safety notes¢.&.
in Procedure for filling the tank on page 242.
&#34;&#34;&#39; Press the tank flap -arrow- ¢ page 242,
Fig. 207 to open it.
.., Take out the floor panel¢ page 2 70.
&#34;&#34;&#39; Remove the plastic base panels ¢ page 58,
Fig. 63.
.., Take the funnel out of the luggage compart­
ment. .....
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&#34;&#34;&#39; Insert the funnel into the fuel filler neck as far
as the stop ¢Fig. 210. The funnel should be in­
serted so far into the fuel filler neck that the
ring on the funnel is not visible.
.., Insert the filler of the spare fuel canister into
the funnel and start fuelling.
...,.
243

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and topping up fluids
... After fuelling, remove the funnel and close the
fuel tank flap so that it locks in place.
CD CAUTION
Remove any fuel spills from the paintwork im­
mediately.
Releasing the tank flap manually
The tank flap can be released manually if the
tank unlocking system should fail to operate.
Fig. 211 Luggage compartment: Cover in the right side
trim
... Open
the boot lid .
... Lift the floor panel.
... Release the ring from its holder and carefully
pull the ring ¢Fig. 211.
Emission control
systems
Catalytic converter
Applies to: vehicles with petrol engine
The vehicle must only be used with unleaded pet­
rol, otherwise the catalytic converter will be ir­
reparably damaged.
Never allow the fuel tank to run completely dry,
as the irregular supply of fuel can cause misfir­
ing. This allows unburnt fuel to enter the exhaust
system, which can cause overheating and dam­
age to the catalytic converter.
Diesel particulate filter
Applies to: vehicles with diesel engine
The diesel particulate filter can filter out almost
all soot particles contained in the exhaust gas. In
normal driving conditions the filter is self-clean-
244 ing.
Should the self-cleaning function of the filter
not be able to operate, e.g. when the vehicle is
continuously used only for short trips, the filter
becomes obstructed with soot and the symbol
C for the diesel particulate filter lights up
¢page 17.
A WARNING
The exhaust system is very hot when the vehi­
cle is being driven and after the engine has
been switched off.
- Never touch the tailpipes when they are hot
- risk of burns!
- Because of the high temperatures which can
occur in the emission control system, do not
park the vehicle where the exhaust can
come into contact with flammable materials
under the car (e.g. on grass or at the forest
edge) -risk of fire!
- Do not apply any underseal agents in the
area around the exhaust system -risk of
fire!
Engine compartment
Working on components in the engine
compartment
Extra caution is necessary when working on com­
ponents in the engine compartment.
Always be aware of the danger of injury and
scalding as well as the risk of accident or fire
when working in the engine compartment (e.g.
when checking and refilling fluids). Always ob­
serve the warnings listed below and follow all
normal safety precautions. The engine compart­
ment of any motor vehicle is a potentially haz­
ardous area ¢ A .
A WARNING
- Switch off the engine.
- Switch off the ignition.
- Apply the parking brake.
- Put the gear lever in neutral or selector in P.
- Wait for the engine to cool down.
- Keep children away from engine compart-
ment.

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Never spill fluids on a hot engine. These flu­
ids can cause a fire (e.g. radiator anti­
freeze).
- Take care not to cause short circuits in the
electrical system, especially when working
on the battery.
- When working in the engine compartment
be aware that the radiator fan may start
running suddenly, even if the ignition is
switched off -risk of injury!
- Do not unscrew the cap on the expansion
tank when the engine is hot. The cooling
system is under pressure.
- Protect face, hands and arms by covering
the cap with a large, thick rag to protect
against escaping coolant and steam.
- Never remove the engine cover panel -risk
of burns!
- If any tests have to be performed with the
engine running, there is an extra safety risk
from the rotating parts, such as the drive
belts, alternator and radiator fan, etc., and
from the high-voltage ignition system.
- Vehicles with automatic gearbox: Never
open the throttle inadvertently (for instance
by hand from the engine compartment) if a
gear is engaged while the vehicle is station­
ary with the engine running. The vehicle will
otherwise start moving immediately and
could cause an accident.
- Observe the following additional warnings if
work on the fuel system or the electrical
system is necessary:
- Do not smoke.
- Never work near naked flames.
- Always keep an approved fire extinguisher
immediately available.
- Any work on the batteries and electrical sys­
tem in your vehicle entails a risk of injury
and chemical burns in addition to danger of
accident or fire. For this reason, you must
have the work carried out by a qualified
workshop.
CD CAUTION
When topping up fluids make sure the correct
fluid is put into the correct filler opening. This Checking
and topping up fluids
can otherwise cause serious malfunctions or
engine damage.
@ For the sake of the environment
Inspect the ground underneath your vehicle
regularly so that any leaks are detected at an
early stage. If you find spots of oil or other
fluids, have your vehicle inspected in the
workshop.
i Note
On right-hand drive vehicles* some of the
containers/ reservoirs mentioned below are
located on the other side of the engine com­
partment.
Opening/closing bonnet
The bonnet is released from inside the vehicle.
Fig. 212 Detail of footwell on driver&#39;s side: Release lever
Fig. 213 Unlocked bonnet: Lever
The wiper arms should be resting on the wind­
screen: make sure they are not in a raised posi-
tion. Otherwise the paint may get damaged.
..,..
245

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and topping up fluids
Opening the bonnet
� With the driver&#39;s door open, pull the Lever un­
der the dashboard in the direction indicated
(arrow) ¢Fig. 212.
� Lift the bonnet slightly¢,&.
� Press the release Lever ¢Fig. 213 in the direc­
tion indicated (arrow). This will release the ar­
rester hooks.
� Open the bonnet.
Closing the bonnet
� To close the bonnet, pull it down to overcome
the spring pressure.
� Then Let it drop into the catches; do not press
down ¢,&.
En ine com artment la out
Main components for checking and refilling A
WARNING
- To avoid the risk of being scalded, never
open the bonnet if you see steam or coolant
escaping from the engine compartment.
Wait until no steam or coolant can be seen
before opening the bonnet.
- For safety reasons the bonnet must always
be completely closed when the vehicle is
moving. After closing it always check that it
is properly secured. It should not be possi­
ble to Lift the front edges of the bonnet.
- Should you notice that the bonnet is not
safely secured when the vehicle is moving,
stop the vehicle immediately and close the
bonnet properly, otherwise it could cause an
accident.
Fig. 214 Typical locations offluid containers and engine oil filler cap
@ Coolant expansion tank (-L) ¢ page 249
@ Engine oil dipstick ¢ page 247
@ Engine oil filler cap(�) ¢ page 247
246 @
Brake fluid reservoir (0)) ¢ page 250
® Jump-start terminals: under a cover (+);
earth point on body (-) ¢page277

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Fuse box¢ page 282
0 Windscreen washer container {�)
c:::>page 252
The positions of the engine oil dipstick and en­
gine oil filler cap¢ Fig. 214 (items @and @)
may be different on some engine versions.
Engine oil
Choosing the correct engine oil grade
The service interval display in the instrument
cluster of your vehicle will inform you when it is
time for an oil change. We recommend having
the oil changed by a qualified workshop.
If you have to top up the oil between oil changes,
use the grades of oil specified in the table in ac­
cordance with VW standards.
- the vehicle is being serviced based on the flexi­
ble or fixed oil change service (see last service
record).
- the vehicle has a petrol or diesel engine (see
sticker on inside of fuel tank flap).
Oil Change Service
Flexible Fixed
Petrol engines vw
504 00 vw 502 00
Diesel engines
vw 507 00 With
diesel
particulate fil-
ter:
vw 507 00
Without diesel
particulate fil-
ter:
vw sos 00
Audi recommends
�Castrol )g[Ij)@[g ?m»E«!JJ1)JJ.lf..
Audi recommends Longlife high-performance
engine oil from Audi Genuine Parts
(© Note
If the oil grades specified in the table are not
available, you can use one of the following
grades as a substitute. To prevent damage to
the engine, this should not be done more Checking
and topping up fluids
than once between oil changes and no more
than 0.5 litres should be used.
- Petrol engines: ACEA A3 or API SN (API SM)
standard
- Diesel engines: ACEA C3 or API CJ-4 stand­
ard
((!)) Note
The flexible oil change service is not available
for all models in all countries.
Checking and topping up the engine oil
level
The oil dipstick differs depending on the type of
engine.
Fig. 215 Oil dipstick (examples): Checking engine oil level
Fig. 216 Engine compartment: Engine oil filler cap
Please refer to the safety notes ¢ .& in Working
on components in the engine compartment on
page 244.
Checking the engine oil level
- Park the vehicle on a level surface. 0
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and topping up fluids
- Switch off the warm engine. Wait for a few mi­
nutes for the oil to drain back into the sump.
- Open the bonnet ¢page 245.
- Pull out the oil dipstick ¢page 246, Fig. 214,
wipe it with a clean cloth and insert it again,
pushing it in as far as it will go.
- Then pull the dipstick out again and check the
oil level ¢table on page 248.
- If the oil level is too low, add more engine oil.
Markings on oil dipstick ¢ Fig. 215
@ When
the oil Level is near the marking @
you must top up the engine oil. Please refer
to ¢ 0.
@ Do NOT add engine oil.
®
@ Do
NOT add engine oil.
Drive to a qualified workshop without delay
and have the engine oil changed ¢0.
Topping up the engine oil
- Unscrew the cap &#34;E::71 ¢Fig. 216from the oil fill­
er opening ¢ page 246, Fig. 214.
- Carefully add 0.5 litres of suitable engine oil
¢page 247.
-After two minutes check the oil level once
again.
- If the oil level is too low, add a smaller quantity
of engine oil. The level must always be below
the marking @¢Fig. 215 ¢0.
- Screw the oil filler cap &#34;E::71 back on and push
the dipstick all the way in.
A WARNING
- Ensure that no engine oil comes into contact
with hot engine components when topping
up: this could cause a fire.
- The oil filler cap must be properly closed to
prevent oil from squirting onto the hot en­
gine or exhaust system while the engine is
running -risk of fire!
- Wash your skin thoroughly if it comes into
contact with engine oil.
248 CD
CAUTION
- The engine oil must never drop below the
marking (!)¢ Fig. 215 -risk of engine dam­
age!
- When topping up the engine oil, make sure
that the oil level is not above the marking
@ ¢Fig. 215, as this may result in damage
to the catalytic converter or to the engine.
Do NOT start the engine. Contact a qualified
workshop to extract the engine oil if neces­
sary.
- Applies to vehicles which have an oil dip­
stick with area® ¢Fig. 215: If you run your
vehicle on diesel fuel of poorer quality than
EN 590 standard fuel, the fuel can get into
the engine oil. In this case, the oil Level
gradually rises and the quality of the engine
oil decreases. Once the oil level has reached
the marking @or the indicator lamp II
has come on, the engine oil level must not
be corrected by extracting the surplus oil -
risk of engine damage! The engine oil must
be changed ¢ page 18.
- No additives should be used with engine oil.
Any damage caused by the use of such addi­
tives would not be covered by the factory
warranty.
® For the sake of the environment
- Never pour engine oil down drains or into
the ground.
-Always observe statutory requirements
when disposing of empty oil canisters.
@ Note
Depending on how you drive and the condi­
tions in which the car is used, oil consumption
can be up to 0.5 Ltr./1000 km. Oil consump­
tion on RS models can be up to 0.8 ltr./1,000
km. Oil consumption is likely to be higher for
the first 5,000 km. For this reason the engine
oil level must be checked at regular intervals,
preferably when filling the tank and before a
journey.

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system
Coolant
The engine cooling system is filled at the factory
with a mixture of conditioned water and coolant
additive. This coolant must not be changed.
The coolant level is monitored by a warning lamp
• ¢page 14. However, we recommend that it
should be checked occasionally.
If you do need to top up the coolant, use a mix­
ture of water and coolant additive. We recom­
mend mixing coolant additive with distilled wa­
ter.
Coolant additive
The coolant additive contains anti-freeze and cor­
rosion protection agent. Only use one of the fol­
lowing coolant additives. It is possible to mix
these additives.
Coolant additive Specification
G13 TL 774
J
G12++ TL 774 G
The amount of coolant additive which needs to
be mixed with the water depends on the temper­
atures to be expected in the winter season. If the
anti-freeze concentration is too low, the coolant
can freeze and cause engine damage.
Cool ant addi· Frost protec-
tive tion
Hot regions min. 40%,
min. -25 °C
max. 45%
Cold regions
min. 50%, max. -40 °C
max. 55%
CD CAUTION
- Have your qualified workshop check the
cooling system before the winter season to
make sure that the anti-freeze concentra­
tion is adequate for the conditions to be ex­
pected. This applies particularly if you drive
into a colder climate zone.
- To prevent damage to the engine, do not
use a different type of anti-freeze additive if
the approved type of additive is not availa- Checking
and topping up fluids
ble. In this case use only water and bring
the coolant concentration back up to the
correct level as soon as possible by putting
in the specified additive.
-Always top up with fresh, unused coolant.
- Radiator sealants must not be added to the
coolant.
Topping up coolant
Fig. 217 Engine compartment: Cap of coolant expansion
tank ;:::;
co
CD
Please refer to the safety notes ¢ A in Working
on components in the engine compartment on
page 244.
Checking the coolant level
... Park your vehicle on a level surface.
.,.. Switch off the ignition.
.,.. Read
off the coolant level on the coolant ex­
pansion tank¢ page 246, Fig. 214. When the
engine is cold, the coolant level should be be­
tween the marks. When the engine is warm, it
may be slightly above the top mark.
Topping up the coolant
Important: The coolant expansion tank must not
be empty ¢(D.
.,.. Wait for the engine to cool down .
.,.. Cover the cap on the expansion tank with a
cloth, and carefully unscrew the cap anti-clock­
wise ¢ ,& .
.,.. Add coolant in the correct concentration
¢ page 249 up to the top mark.
... You should make sure that the fluid level re­
mains stable. If necessary, add more coolant.
... Screw the cap on again tightly.
IJi-
249