engine AUDI Q3 2018 Workshop Manual

a
co
...... N r-,. N
"" 0 0 ::, co
Audi dealer or authorized Audi Service Facility
and have the cooling system inspected. If the
cooling system is not leaking, a loss can come
from the coolant boiling through overheating
and being pushed out of the cooling system.
A WARNING
- The cooling system is under pressure . Do
not open the coolant expansion tank cap
when the engine is hot . This increases the
risk of burns .
- The coolant additive and the coolant can be
dangerous to your health. For this reason,
keep the coolant in the original container
and away from children. There is a risk of
poisoning.
- When working in the engine compartment,
remember that the radiator fan can switch
on even if the ignition is switched off, which
increases the risk of injury.
CD Note
-
Do not add coolant if the expansion tank is
empty . Air could enter the cooling system and
damage the engine.
If this is the case, do not
continue driving. See an authorized Audi deal­
er or authorized Audi Service Facility for assis­
tance.
Brake fluid
Fig. 141 Eng ine compartment: cap on brake flu id reservoir
Observe the safety precautions ¢ page 155,
Working in the engine compartment .
Checking the brake fluid level
~ Read the brake fluid Level on the brake fluid
reservoir ~
page 158, fig . 13 7. The brake fluid
Checking and Filling
Level must be between the MIN and MAX mark­
ings
~ A .
The brake fluid Level is monitored automatically.
Changing the brake fluid
Have the brake fluid changed regularly by an au­
thorized Audi dealer or authorized Audi Service Facility .
A WARNING
- If the brake fluid level is below the MIN
marking, it can impair the braking effect
and driving safety, which increase the risk of
an accident. Do not continue driving. See an
authorized Audi dealer or authorized A udi
Service Facility for assistance.
- If the brake fluid is old, bubbles may form
in the brake system during heavy braking .
This would impair braking performance and driving safety, which increases the risk of an
accident .
- To ensure the brake system functions cor­
rectly, only use brake fluids that comply
with VW standard 501 14 or
FMVSS-116 DOT 4.
CD Note
- If the brake flu id level is above the MAX
marking, brake fluid may Leak out over the
edge of the reservoir and result in damage
to the vehicle.
- Do not get any brake fluid on the vehicle
paint, because it will corrode the paint.
Battery
General warnings about batteries
Because of the complex power supp ly, all work
on batteries such as disconnecting, replacing,
etc. should
only be performed by an authorized
Audi dealer or authorized Audi Service Facility
¢ .&,.
The term "vehicle battery " refers to the 12 Volt
battery in your vehicle.
163
...

Checking and Filling
Detailed warning s for the vehicle b atter y:
®
Wear eye protection .
A
Battery acid is high ly corrosive . Wear pro-
tective gloves and eye pro tect ion.
@
F ire, spark s, open flame an d smok ing are
forb idden .
~
A highly explosive mix ture of gases can
form when charging batteries.
®
Keep c hildren away from battery acid and
ba tteries .
A WARNING
All work on the battery or electrical system in
your vehicle can result in injuries, chemical
burns, accidents or burns. Because of this, all
work must be performed
onl y by an author­
i z ed Aud i dealer or authorized Audi Serv ice
Facility.
A WARNING
California Proposit ion 65 Warning :
- Battery posts, termina ls and related acces­
sories contain lead and lead compounds,
chem icals known to the State of California
to cause cancer and reproductive problems .
Wash hands after handling .
(D Note
Protect the vehicle battery against freezing if
the vehicle wilt be parked for long periods of
time so that it is not destroyed by "freezing"
9 page 164, Charging the vehicle battery .
Charging the vehicle battery
Fig . 14 2 Eng ine co mpartment: con nect ors fo r a c har ger
and jump start cab les
164
Observe the safety precautions 9 pag e 155,
Working in the eng ine compartm ent.
Requirement: only use chargers with a maximum
ch arg ing curr ent of 30 amps /14 .8 V olt s.
The ve­
hicle battery cables remain connected .
The battery is located in the engine compart­
ment . T he ground po int
0 i s always located on
the veh icle body .
.,. Read the wa rnings
9 .&. in General warnings
about batteries on page 164
and 9 ,&. .
.,. Switch off the ig nitio n and all electrica l equ ip-
men t.
.,. Open the hood
9 page 157 .
.,. Fold th e battery cover upward 9 fig. 142.
.,. Clamp the terminal clamps on the charger cor­
rectly onto the ground point
O and the pos it ive
termin al(v .
.,. Now insert the power cable for the charging de ­
vice into the socket and switch the device on .
.,. At the end of the charging p rocess, switch the
charger off and pull the power cable ou t of the
socket.
.,. Now remove the charging device term inal
clamps.
.,. Close the batt ery cov er.
.,. Close the hood
¢ page 15 7.
A WARNING
- A high ly explosive mixture of gases can form
when charg ing batteries . Only charge the
veh icle battery in we ll-ventilated areas .
- A drained vehicle battery can freeze at tem­
peratures around 32 QF (0 QC). A frozen or
thawed vehicle battery must not be charged
and must not be used anymo re . T he battery
housing can crack and batte ry a cid can leak
out if ice forms, which increases the risk of
an explosion and chemical burns. Contact an
authorized Audi dealer or authorized Audi
Service Facility for more information.
- Do not connect or disconnect the charging
cable wh ile charging because this increases
the risk of an explosion .

0 co ......
"' ,....
"' ...... 0 0 :::,
00
@ Tips
- Only charge the vehicle battery through the
connections in the engine compartment.
- Read all of the manufacturer's instructions
for the charger before charging the vehicle
battery.
Windshield washer system
Fig. 143 Engine compartment: windshield washer fluid
reservoir
Observe the safety precautions q page 155,
Working in the engine compartment.
M N ~ N
"' a) ID
The windshield washer fluid reservoir W contains
the cleaning solution for the windshield and the rear w indow
q page 158, fig . 137,. The reservoir
capacity can be found in
qpage 210.
To reduce the risk of lime scale deposits on the
spray nozzles, use clean water with low amounts
of calc ium . Always add window cleaner to the wa­
ter. When the outside temperatures a re cold, an
anti-freezing agent should be added to the water
so that it does not freeze.
- The concent ration of anti-freezing agent
must be adjusted to the vehicle operating
conditions in the respective climate. A con­
cent ration that is too high can lead to vehi­
cle damage.
- Never add radiator anti-freeze or other addi­
tives to the washer fluid.
- Do not use a glass cleaner that contains
paint solvents, because this could damage
the paint .
Checking and Filling
Service interval display
The service interval display detects when your ve­
hicle is due for service .
The service interval display works in two stages:
-Inspection or oil change reminder : after a cer-
tain distance is driven, a message appears in
t he instrument cluster display every time the
ignition is switched on. The remaining distance
or time is displayed br iefly.
- Inspection or oil change due: if your vehicle
has reached an inspection or oil change interval
or both intervals at the same time, the mes­
sage
Inspection due! or Oil change due! or Oil
change and inspection due!
appears briefly af­
ter sw itching the ignition on.
Checking service intervals
You can check the remaining distance or time un ­
ti l the next oi l change or next inspection .
- Select: the
I CARI function button > (Car) Sys­
tems*
control button > Servicing & checks >
Service intervals .
Resetting the indicator
An autho rized Aud i dea ler or a uthorized Audi
Service Facility will reset the service in terva l dis­
play after performing service .
If you have changed the o il yourself, you must re­
set the oil change interval.
Perform the follow ing to reset the d isplay:
- Select: the
I CAR I function button > (Car) Sys­
tems *
control button > Servicing & checks >
Service intervals . Turn the control knob down­
ward to
Reset oil change interval and press the
control knob .
~ Note
-Only reset the oil change ind icator if the oil
was changed.
- Following the service intervals is crit ica l to
ma intaining the service life and value of
your vehicle, especially the engine . Even if
the mileage on the vehicle is low, do not ex­
ceed the time for the next service.
165

Wheels
and the tire pressures specified
on the label on the driver's side B­
pillar, always follow the specifica­
tion on the B-pillar label
¢ page 176, fig. 146.
Make sure that the tire designa­
tion on your tire matches the des-
Model/ Tire designation
Engine
ignation on the tire pressure label
and the tire pressure table.
The following table lists recom­ mended tire pressures in cold
tires according to the load and
the size of the tires installed.
Tire pressure
Normal load Maximum load
(up to 3 people)a)
front rear front rear
PSI
Q3: 235/50 Rl8 97H 32
2.0L
235/50 Rl8 97V 32
4 cylinders 255/40 Rl9 l00Y 33
255/35 R20 97Y 33
255/40 Rl9 l00H 33
a) 2 peop le in the front ; 1 perso n in the rear
.8, WARNING
Please note the important safe­
ty precautions regarding tire
pressure ¢
page 176 and load
limits ¢
page 178.
Tires and vehicle load limits
There are limits to the amount of
load or weight that any vehicle
and any tire can carry. A vehicle
that is overloaded will not handle
well and is more difficult to stop.
Overloading can not only lead to
loss of vehicle control, but can al­
so damage important parts of the
vehicle and can lead to sudden
178
kPA PSI kPA PSI kPA PSI kPA
220 32 220 33 230 36 250
220 3 2 22 0
33 230
36 250
230 33 230 44
300 46 320
230 33 230 44 300 4
6 320
230 33 230 44 300 46 320
tire failure, including a blowout
and sudden deflation that can
cause the vehicle to crash.
Your safety and that of your pas­
sengers also depends on making
sure that load limits are not ex­
ceeded. Vehicle load includes ev­
erybody and everything in and on
the vehicle. These load limits are
technically referred to as the vehi­
cle's
Gross Vehicle Weight Rat­
ing
("GVWR").
The "GVWR" includes the weight
of the basic vehicle, all factory in­
stalled accessories, a full tank of
11>

a
co
...... N r--. N
'"' 0 0 ::, co
Emergency assistance
General information
.. Park the vehicle as far as poss ible from moving
traffic in the event of a breakdown. In the event
of a flat tire, park the vehicle on a leve l surface .
It you are on a steep h ill, be especially careful.
.. Set the parking brake.
.. Switch the emergency flashe rs on .
.. Put on a reflective vest .
.. Set up the warn ing triang le, if available .
.. Have the passengers exi t the veh icle. They
sho uld move to a safe place, for example be­
hind a guard rail.
_& WARNING
Follow the steps given above. This is for your
protection and the for the safety of other d riv ­
ers.
Equipment
Vehicle tool kit
Fig. 1 48 Luggage compartmen t: ca rgo floor cover folded
upward
The vehicle tool kit is located in the luggage com­
partment under the cargo floor cover .
.. Push on the plast ic hand le a nd lift up the cargo
floor.
.. Open the cargo floor.
Completely ret ract the vehicle jac k arm before
sto ring the vehicle jack*.
Em ergen cy a ssis tanc e
_& WARNING
-Applies to: ve hicles with jack
Improper use of the veh icle jack can cause se­
rious pe rsonal injuries.
- Never use the screw driver hex head to
tighten wheel bolts, since the bolts cannot attain the necessa ry t ightening to rque if yo u
use the hex head, po ten tially causing an ac­
cident .
- The factory-supplied jack is intended only
for your ve hicl e mode l. Under no circum­
s tances shou ld it be used to lift heavy
vehicles o r other loads; you risk i njuring
yourse lf.
- Never start the engine when the vehicle is
raised, which cou ld cause an accident .
- Support the vehicle securely with appropri ­
ate stands if work is to be performed under ­
neath the vehicle; otherwise, there is a po­
tential risk for injury.
- Never use the jack supplied with your Audi
on another vehicle, particularly on a heavier
one. The jack is only su itable for use on the
veh icle it came with .
{!) Tips
The vehicle jack * in your vehicle is mainte ­
nance-free.
Replacing wheels
Preparation
You must complete the preparation before
changing a tire .
.. Read and follow the important safety precau-
tions
<=:> page 191.
.,. Set the park ing brake .
.,. Select the P selector lever posit ion.
.,. W hen tow ing a tra iler: disconnect the trailer
from yo ur vehicle .
.. Lay out the vehi cle too l kit ¢
page 191 and the
spare tire
<=:> page 197.
191

Emergency assistance
& WARNING
You or your passengers could be injured while changing a wheel if you do not follow these
safety precautions :
- If you have a flat ti re, move a safe d ista nee
off the road . Turn off the engine, turn the
emergency flashers on and use other warn·
ing devices to alert other motorists.
- Make sure that passengers wait in a safe
place away from the vehicle and well away
from the road 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 front and back of the wheel diagonally
opposite the wheel being changed with the
folding chocks or other objects. When one
front wheel is lifted off the ground, placing
the Automatic Transmission in "P" (Park)
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 .
- Always store the vehicle tool kit, the jack
and the replaced tire in the luggage com­
partment
c:> page 102 .
(D Tips
Obey all laws.
Changing a wheel
When you change a wheel, follow the sequence
described below step-by-step and in exactly that
order.
1. Remove the decorative wheel cover* or the
wheel bolt caps*. For more details see also
<=:>page 193.
2. Loosen the wheel bolts c:> page 193.
3. Locate the proper mounting point for the
jack and align the jack below that point
<=:>page 194.
4. Lift the car with the jack c:> page 194 .
5. Remove the wheel with the flat tire and then
install the
spare tire <=:>page 195.
6. Tighten all wheel bolts lightly.
7.
Lower the vehicle with the jack.
192
8. Use the wheel bolt wrench and firmly tighten
all wheel bolts in a crisscross pattern
<=:>page 193.
9. Replace the decorative wheel cover* or the
wheel bolt caps*.
& WARNING
Always read and follow all WARNINGS and in­
formation
c:> .&. in Raising the vehicle on
page 194
and <=:>page 196.
After changing a wheel
A wheel change is not complete without the do·
ing the following .
.,. Always store the vehicle tool kit, the jack* and
the replaced tire in the luggage compartment
c:>page 102.
.,. Check the tire pressure of the spare tire as soon
as possible .
.,. As soon as possible, have the
tightening tor·
ques
on all wheel bolts checked with a torque
wrench. The correct tightening torque is
10S ft lbs (140 Nm).
.,. Have the flat tire
replaced as soon as possible.
(D Tips
- If you notice that the wheel bolts are cor­
roded and difficult to turn while changing a
tire, they should be replaced before you check the tightening torque.
- Drive at reduced speed until you have the
tightening torques checked .

-Make sure jack posit ion is correct , adjust
as necessary and then cont inue to raise
the jack.
- If work has to be done under the vehicle,
ensure that it is safely supported on su ita­
ble stands -risk of injury!
- Never start the engine when the vehicle is
on the jack -risk of accident!
CD Note
Do not lift the vehicle by the sill. Position the
vehicle jack on ly at the designated lifting
points on the sill. Otherwise, your vehicle will
be damaged.
Taking the wheel off/installing the spare
tire
F ollow these instructions step-by-step for chang­
ing the wheel .
Fig. 154 C hangin g a w heel: using th e hexagonal s oc ket
(w it h the blade removed ) to turn t he bolt s
Fig. 155 Chan gin g a w hee l: a lig nm ent pin in side the to p
h ol e
After you have loosened all wheel bolts and
~ raised the vehicle off the ground, remove and re-....
~ place the whee l as follows:
N .... 0 0 ::, (X)
Em ergen cy a ssis tanc e
Removing the whe el
.,. Remove the topmost wheel bolt completely
with the
he xagona l s oc ket in the screwdriver
handle (vehicle too l kit) ¢
fig. 154 and set it
aside on a
clean surface.
.,. Screw the threaded end of the
alignment pin
from the tool kit hand-tight into the empty bolt
hole ¢
fig. 155 .
.,. Then remove the other wheel bolts as described
above .
.,. Take off the whee l leaving the alignment p in in
the bolt hole
r=.> G) .
Putting on the spare tire
.,. Push the spare tire over the alignment pi n
¢(D .
.,. Screw on the whee l bolts and tighten them
slightly u sing the hexagona l socket .
.,. Remove the alignment pin and insert and t ight­
en the remaining wheel bo lt s lightly like the
rest .
.,. Turn the jack hand le count er-clockw ise to lower
the vehicle unti l the jack is fully released .
.,. Use the wheel bo lt wrench to tighten all wheel
bolts firmly . Tighten them
in a crisscross pa t­
tern,
from one bolt to the (approx imately) op ­
posite one, to keep the wheel centered .
.,. Perform the steps required after chang ing the
wheel ¢
page 192, A~er changing a wheel.
_& WARNING
Do not use the hexagon al soc ket in the screw­
driver handle to tighten the wheel bo lts. It is
not possible to tighten the bolts to the re­
qu ired torque using the hexagonal socket -
risk of acc ident!
CD Note
When removing or installing the wheel, the
rim could h it the brake rotor and damage t he
rotor. Work carefully and have a second per­
son to he lp you.
@ Tips
- When mounting tires with un idirectional
tread de sign
make sure the tread pattern is
pointed the right way
r=.> page 196. 1JJ,,
195

Fuses and bulbs
Electrical fuses
Changing fuses
A fuse that has blown will have metal strips that have burned through .
Fig. 158 Driver's side of the cockpit: fold ing the storage
co mpartme nt dow n
Fig. 159 Engine compartment: removing the fuse pane l
cover
The fuses are located in the driver's side footwell
behind the storage compartment and in the en­
gine compartment .
Preparations
.. Switch the ign ition and all electr ical equipment
off .
.. Check the following table to see which fuse be-
longs to the equipment .
Fuses behind the storage compartment
.. Open the storage compartment .
.. Press the left and right retainers inward and
fold the compartment all the way down
a ¢fig. 158 . co ...... N ~ Fuses in the engine compartment
'"' 0 g .. Open the hood ¢ page 155.
co
Fuses and bulbs
.. To release the fuse panel cover, slide both slid­
ing retainers at the left and right forward
¢ fig. 159 .
.. Remove the fuse panel cover .
Replacing fuses
The clamp is located below the fuses behind the
storage compartment (driver's side) .
.. Fold th is compartment all the way down and
remove the clamp from the holder .
.. Remove the colored plastic clip from the fuse
panel, if necessary . You can dispose of the plas­
tic clip .
.. Remove the fuse using the clamp .
.. Replace the blown fuse only with an identical
new one .
.. Install the cover.
Fuse color identification
Color Current rating
in amps
Black 1
Purple 3
Light brown 5
Brown 7.5
Red 10
Blue 15
Yellow 20
White or transparent 25
Green 30
Orange 40
A WARNING
Do not repair fuses and never replace a blown
fuse with one that has a higher amp rat ing .
This can cause damage to the electr ical sys­
tem and increases the risk of fire.
(D Note
If a new fuse burns out again shortly after you
have installed it, have the electrical system
checked as soon as poss ible by an authorized
Audi dealer or authorized Audi Service Facili­
ty.
199

Fuses and bulbs
(D Tips
-The following table does not list fuse loca­
tions that are not used.
- Some of the equipment listed in the follow­
ing tables applies only to certain model ver­
sions or certain optional equipment.
Fuse assignment, cockpit
The fuse number is stamped into the plastic be­
low or above each fuse.
No. Equipment
1 LED headlight (left)
2 LED headlight (
right)
5 LED headlight (left)
6 LED headlight (right)
7 Steering lock
8 Convenience access contro
l module
9 Airbag control module, AIRBAG OFF
indi-
cator light
12
Transmission control module, selector
mechanism
Air quality sensor for cl imate control sys-
tern, heated w indow washer nozzles,~
button, reverse light,(®) button, oil level
13 sensor, climate contro
l system, seat occu-
pant detection system, seat heating, but-
tons in the center console, automatic dim-
ming mirror
Engine control module , quattro control
modu le, transmission control module,
14 brake lights, electromechanica
l steering,
Gateway control module, trai ler hitch con-
trol module, ESC control module, light
switch, damping control module
Headlight range control module, instru-
ment illumination, headlights (left, right),
15 diagnostic connector, crankcase housing
heater, a
ir flow sensor, socket relay, DC/
DC converter
16 Parking aid
17 Parking system rearview camera
18 TV tuner
19 Engine starter control, DC/DC converter
200
No
. Equipment
20 E
SC contro l module, climate/heating con-
trol, special functions interface
21 Selector mechanism power supply
22 Interior monitoring
(®) button, front interior lighting buttons,
23 diagnostic connector, light
switch, light/
rain sensor, humidity sensor, emergency
call system
25 Headlight power supply
26 Rear window wiper
27 Starter system
28 Infotainment system
29 Supply for
the park ing system rearview
camera and TV tuner
30 Infotainment system
31 Infotainment system
32 Instrument cluster
33 Automatic dimming rearview mirror
36 Cigarette lighter, cockpit/luggage com
-
partment socket
37 Cockpit/rear socket 38 Transmission contro l module
40 Trailer hitch control module 41 Trailer hitch control module
42 Trai ler hitch control module
44 Rear window defogge r
4S Electromechanical parking brake control
module
46 Trailer hitch control module
47 quattro control module
48 Automatic luggage compartment lid con-
tro
l modu le
so Blowe r
51 Electromechanical parking brake control
module
52 BCM
53 Front seat heating
54 Panorama gla ss roof
55 Sunshade on the panorama glass roof
56 Contro l modu le for suspension control

0 co ......
"' ,....
"' ...... 0 0 :::,
00
Engine compartment fuse assignment
The fuse number is stamped into the plastic be­
low or above each fuse.
No. Equipment
1 Transmiss ion supply
2 ESC
3 Horn
4 DC/DC
converter
5 BCM, battery data module
6 BCM (right)
7 Washer fluid pump
8 BCM (left)
9 Seat adjustment lumbar support
10 Glow time
control module, fuel pump,
heated oxygen sensor
11 Steering
column lever, multifunction
steer ing whee l controls
1 2 Cell phone adapter
13 En
gine control module
14 Engine control module
15 Gateway
16 Heated oxygen sensor, fuel pump, eng
ine
components
17 Engine components
18 Fue
l pump control module
19 Sound amplifier, DC/DC converter
20 Clutch pedal sensor, brake light sensor
22 Windshield wipers Radiator fan, engine components, coolant
23 recirculation pump, auxiliary
heater, fuel
pump relay coils
24 Ignition coils
25 Driver's door
control module (central lock-
ing, window regulators)
26 Front passenger's door control module
(centra
l locking, window regulators)
27 Term inal 15 supply
29 Power seat adjustment (driver,
front pas-
senger)
30 ESC
Fu ses an d bulb s
Bulbs
Replacing light bulbs
For your safety, we recommend that you have
your authorized Audi dealer replace any bulbs for
you .
It is becoming increasingly more and more diffi­
cult to replace vehicle light bulbs since in many
cases, other parts of the car must first be re­
moved before you are able to get to the bulb .
T his applies especially to the light bulbs in the
front of your car which you can only reach
through the engine compartment .
Sheet metal and bu lb holders can have sharp
edges that can cause serious cuts, pa rts must be
correctly taken apart and then properly put back
together to help prevent breakage o f parts and
long term damage from water that can enter
housings that have not been properly resealed.
For your safety, we recommend that you have
your authorized Aud i dea ler rep lace any bulbs fo r
you, since your dealer has the proper tools, the
correct bulbs and the expertise.
Gas di schar ge la mps (Xe no n ligh ts):
Due to the high electr ical voltage, have the bulbs
rep laced by a qualified technician. Headlights
with Xenon light are identified by the hig h volt­
age st icker.
LED headlights* require no maintenance . Please
contact your authorized Audi dea ler if a bulb
needs to be replaced.
_&. WARNING
Changing Xenon lamps wi thout the necessary
equipment can cause serious personal injury .
- Bulbs are pressu rized and can explode when
be ing changed. Potent ial ris k of injury!
- On veh icles equipped with gas disc harge
bu lbs (Xenon light) life-threatening injuries
can resu lt from improper handling of the
high-vo ltage portions of such lamps!
- Only your authorized A udi dealer or quali­
f ied workshop sho uld change the bulbs in
gas discharge lamps. There are parts with
sharp edges on the openings and on the
201