engine MERCEDES-BENZ C-Class COUPE 2017 CL205 Workshop Manual

Switching cooling with air dehumidification on/off
General notes
If you deactivate the "Cooling with air-dehumidification" function, the air inside the vehicle will not
be cooled. The air inside the vehicle will also not be dehumidified.T he windows can fog up more
quickly. Therefore, deactivate the cooling with air-dehumidification function only briefly.
The "Cooling with air dehumidification" function is only available when the engine is running. The air
inside the vehicle is cooled and dehumidified according to the temperature selected.
Condensation may drip from the underside of the vehicle when it is in cooling mode. This is normal
and not asign that there is amalfunction.
Activating/deactivating
XPress the ¿rocker switch up or down.
The indicator lamp above the rocker switch lights up or goes out.
Problems with the "Cooling with air dehumidification" function
ProblemPossible causes/consequences and MSolutions
The indicator lamp above
the¿ rocker switch
flashes three times or
remains off. The cooling
with air dehumidification
function cannot be acti-
vated via the multimedia
system any longer
(
Ypage 263).
Cooling with air dehumidification has been deactivated due to amal-
function.
XVisit aqualified specialist workshop.
Setting climate control to automatic
General notes
In automatic mode, the set temperature is main-
tained automatically at aconstant level. The
system automatically regulates the temperature
of the dispensed air, the airflow and the air dis-
tribution.
The "Cooling with air dehumidification" function
is activated automatically in automatic mode.
Automatic control
XTurn the SmartKey to position 2in the ignition
lock (Ypage 131).
XSet the desired temperature using the w
rocker switch on the front control unit.
XTo activate: press rocker switch Ãup or
down.
The indicator lamp above the Ãrocker
switch lights up.
XTo switch to manualo peration:press the
H rocker switch up or down.
or
XPress the upper or lower section of the _
rocker switch.
The indicator lamp above the Ãrocker
switch goes out.
In automatic mode, if you adjust the airflow or
air distribution manually,t he indicator lamp
above the Ãrocker switch goes out. The
function which has not been changed manually,
Operating the climate control systems123
Climatec ontrol

Notesonb reaking-in anew vehicle
Important safety notes
Thes ensors ystemofs omedriving and driving
safety systems adjusts automaticall ywhile a
certai ndistance is being driven after the vehicle
ha sb eend elivere dorafter repairs. Full system
effectiveness is not reache duntilthe end of this
teach-i nprocedure.
New and replaced brake pads and discs only
reach their optimum braking effect after several hundred kilometers of driving. Compensate for
thi sb yapplyin ggreate rforce to the brake pedal.
The first 1000 miles (150 0km)
Them orey ou look after the engine when it is
new ,the mor esatisfied yo uwillbew ithi ts per-
formance in the future.
RYo us houl dtherefore drive at varying vehicle
and engine speeds for the first 1000 miles
(1500 km).
RAvoi dheavy loads, e.g .driving at full throttle,
during thi speriod.
RWhen changing gear smanually, change up in
good time, befor ethe tachomete rneedl erea-
ches Ôof the wa ytothe red area of the tach-
ometer.
RDo not manuall yshift to alower gear to brake
the vehicle.
RTry to avoi ddepressing the accelerator pedal
beyond the point of resistanc e(kickdown).
RAllv eh icle s(exce pt Mercedes-AMG vehi-
cles): ideally, for the first 1,000 miles
(1,500 km), drive in drive program E.
Additiona lbreaking-i nnote sfor Mercedes-AMG
vehicles:
RDo not drive fastert han8 5m ph (14 0km/h)
for the first 1,000 mile s(1,500 km).
ROnl yallow the engine to reach amaximum
engine spee dof4,500 rpm briefly.
RChang egearing oodt ime.
RIdeally ,for the first 1,000 mile s(1,500 km),
drive in program C.
After 1000 mile s(1500 km), you can increase
th ee ngi
n espeed gradually and accelerate th e
vehicl etofull speed.
You should also observ ethese note sonbreak-
in ginift heengin eorp artsoft hedrive train on
your vehicl ehaveb een replaced. Always observ
ethe maximum permissibl e
speed.
Self-lockin greara xled ifferential
(Mercedes-AMG vehicles)
Your vehicl eisequipped wit haself-locking dif -
ferential on th erear axle.
Change th eoil to improv eprotection of th erear
axl ed ifferential:
Rafter abreaking-i nperiod of 1,850 mile s
(3,00 0km)
Revery 31,00 0miles( 50,00 0km) or 3years
These oil changes prolon gthe servic elife of th e
differential. Hav ethe oil chang ecarrie dout at a
qualified specialist workshop .
Driving
Important safety notes
GWARNIN G
Objects in th edriver's footwell can restrict th e
pedal travel or obstruct adepressed pedal .
The operating and roa dsafet yoft hevehicl eis
jeopardized. There is ariskofana ccident.
Mak esuret hata ll objects in th evehicl eare
stowed correctly, and that they canno tenter
th ed river's footwell. Install th efloormats
securel yand as specified in order to ensur e
sufficien tclearance for th epedals. Do no tuse
loos efloormats and do no tplac efloormats on
to pofo neanother.
GWARNIN G
Unsuitable footwear can hinder correc tusage
of th epedals, e.g. :
Rshoes withthick sole s
Rshoes wit hhigh heels
Rslipper s
There is ariskofana ccident.
Wear suitable footwear to ensur ecorrect
usage of th epedals.
130Driving
Driving and parking

GWARNING
If you switch off the ignitio nwhile driving,
safety-relevant functions are only available
with limitations, or not at all .This coul daffect,
for example, the power steering and the brake
boosting effect. You wil lrequire considerably
more effort to steer and brake. There is arisk
of an accident.
Do not switch off the ignitio nwhile driving.
GWARNING
If the parking brake has not been fully
released when driving, the parking brake can:
Roverheat and caus eafire
Rlose its hold function.
There is arisk of fire and an accident. Release
the parking brake full ybefore driving off.
!Do not war mupthe engine with the vehicle
stationary. Drive off immediately. Avoid high
engine speeds and driving at full throttle until
the engine has reache dits operating temper-
ature.
Only shift the automatic transmission to the
desired drive position when the vehicleiss ta-
tionary.
Where possible,a voids pinning the drive
wheels when pulling awa yonslippery roads.
You coul dotherwise damage the drive train.
!Mercedes-AMG vehicles: at low engine oil
temperatures below 68 ‡(+20 †), the max-
imum engine speedisr estricted in order to
protect the engine. To protect the engine and
maintai nsmooth engine operation, avoi ddriv-
ing at full throttle when the engine is cold.
SmartKey positions
SmartKey
gTo remove the SmartKey
1Powe rsupply for some consumers ,such as
the windshiel dwipers
2Ignition (power supply for all consumers)
and drive position
3To start the engine
iThe SmartKey can be turned in the ignition
lock even if it is not the correct SmartKey for
the vehicle. The ignitio nisnot switched on.
The engine cannot be started.
Start/Stop button
General notes
When you insert the Start/Stop button into the
ignitio nlock, the system needs approximately
two seconds recognitio ntime. You can then use
the Start/Stop button.
Pressing the Start/Stop button severalt imes in
succession corresponds to the different key
positions in the ignitio nlock. This is only the
case if you are not depressing the brake pedal.
If you depress the brake pedala nd press the
Start/Stop button, the engine starts immedi-
ately.
Ac heck which periodically establishe saradio
connection between the vehiclea nd the Smart-
Key determines whethe ravalidS martKey is in
the vehicle. This occurs, for example, when
starting the engine.
Driving131
Driving and parking
Z

To start the vehicle without actively using the
SmartKey:
Rthe Start/Stop button must be inserted in the
ignition lock.
Rthe SmartKey must be in the vehicle.
Rthe vehicle must not be locked with the
SmartKey or KEYLESS-GO (Ypage 75).
Do not keep the SmartKey:
Rwith electronic devices, e.g. amobile phone
or another SmartKey.
Rwith metallic objects, e.g. coins or metal foil.
Rinside metallic objects, e.g. ametal case.
This can affect the functionality of the Smart-
Key.
If you lock the vehicle with the SmartKey's
remote control or with KEYLESS-GO, after a
short time:
Ryou will not be able to switch on the ignition
with the Start/Stop button.
Ryou will not be able to start the engine with the
Start/Stop button until the vehicle is
unlocked again.
If you lock the vehicle centrally using the button
on the front door (
Ypage 81), you can continue
to start the engine with the Start/Stop button.
The engine can be switched off while the vehicle
is in motion by pressing and holding the Start/
Stop button for three seconds. This function
operates independently of the ECO start/stop
automatic engine switch-off function.
Key positions with the Start/Stop button
:Start/Stop button
;Ignition lock
As soon as the ignition is switched on, all the
indicator lamps in the instrument cluster light
up. Further information on situations where an
indicator lamp either fails to go out after starting the engine or lights up while driving
(
Ypage 248).
If Start/Stop button :has not yet been
pressed, this corresponds to the SmartKey
being removed from the ignition.
XTo switch on the power supply: press
Start/Stop button :once.
The power supply is switched on. You can now activate the windshield wipers, for example.
The power supply is switched off again if:
Rthe driver's door is opened and
Ryou press Start/Stop button :twice when in
this position
XTo switch on the ignition: press Start/Stop
button :twice.
The ignition is switched on.
The ignition is switched off again if:
Ryou do not start the engine from this position
within 15 minutes
Ryou press Start/Stop button :twice when in
this position
The power supply is switched off again if:
Rthe driver's door is opened and
Ryou press Start/Stop button :twice when in
this position
Removing the Start/Stop button
You can remove the Start/Stop button from the
ignition lock and start the vehicle as normal
using the SmartKey.
It is only possible to switch between Start/Stop
button mode and SmartKey operation when the
transmission is in position P.
XRemove Start/Stop button :from ignition
lock ;.
You do not have to remove the Start/Stop but-
ton from the ignition lock when you leave the
vehicle. You should, however, alwayst ake the
SmartKey with you when leaving the vehicle. As
long as the SmartKey is in the vehicle:
Rthe vehicle can be started using the Start/
Stop button
Rthe electrically powered equipment can be
operated
132Driving
Driving and parking

Starting the engine
Important safety notes
GWARNING
If children are left unsupervised in the vehicle,
they could:
Ropen the doors, thus endangering other
people or road users.
Rget out and disrupt traffic.
Roperate the vehicle's equipment.
Additionally, children could set the vehicle in
motion if, for example, they:
Rrelease the parking brake.
Rshifting the automatic transmission out of
park position P
RStart the engine.
There is arisk of an accident and injury.
When leaving the vehicle, always take the
SmartKey with you and lock the vehicle. Never
leave children or animals unattended in the
vehicle. Always keep the SmartKey out of
reach of children.
GWARNING
Combustion engines emit poisonous exhaust
gases such as carbon monoxide. Inhaling
these exhaust gases leads to poisoning. There
is ar isk of fatal injury. Therefore never leave
the engine running in enclosed spaces with-
out sufficient ventilation.
GWARNING
Flammable materials introduced through
environmental influence or by animals can
ignite if in contact with the exhaust system or
parts of the engine that heat up. There is arisk
of fire.
Carry out regular checkstom ake sure that
there are no flammable foreign materials in
the engine compartmentorint he exhaust
system.
General notes
The catalytic converter is preheated for up to
30 seconds after acold start. The sound of the
engine may change during this time.
Automatic transmission
XShift the transmission to position P
(Ypage 141).
The transmission position display in the mul-
tifunction display shows P(
Ypage 142).
iYou can start the engine in transmission
position Pand N.
Starting procedurew ith the SmartKey
To start the engine using the SmartKey instead
of the Start/Stop button, pull the Start/Stop
button out of the ignition lock.
XTurn the SmartKey to position 3in the ignition
lock and release it as soon as the engine is
running (
Ypage 131).
If the engine will not start:
XRemove the SmartKey from the ignition lock.
XReinsert the SmartKey into the ignition lock
after ashort waiting period.
XTurn the SmartKey to position 2in the ignition
lock (Ypage 131).
The indicator lamps in the instrumentc luster
light up (
Ypage 246).
XTurn the SmartKey to position 3in the ignition
lock (Ypage 131) and release it as soon as the
engine is running.
Starting procedurew ith the Start/Stop
button
The Start/Stop button is only available on vehi-
cles with KEYLESS-GO or the KEYLESS-GO start
function.
The Start/Stop button can be used to start the
vehicle manually without insertingt he SmartKey
into the ignition lock. The Start/Stop button
must be inserted in the ignition lock and the
SmartKey must be in the vehicle. This mode for
startin gthe engine operates independently of
the ECO start/stop automatic engine start func-
tion.
You can start the engine if avalid SmartKey is in
the vehicle. Switch off the engine and always
take the SmartKey with you when leaving the
Driving133
Driving and parking
Z

vehicle, even if you only leave it forashort time.
Pay attention to the important safety notes.
XDepress the brake pedala nd keep it
depressed.
XPress the Start/Stop button once
(Ypag e131).
The engine starts.
Starting procedure via smartphone
Observe the important safety notes on starting
the engine (Ypag e133).
You can als ostart you rengine via you rsmart-
phone from outside the vehicle. In this case, the
previousl yselected climate control setting is
activated .Inthis way you can cool or heat the
interior of the vehicl ebefore starting the jour-
ney.
Only start the engine via you rsmartphone if it is
safe to start and run the engine where you rvehi-
cle is parked.
Observe the lega lstipulations in the area where
you rvehicl eisp arked .Engine start via smart-
phone may be limited to certain countries or
regions.
You can execute amaximu moftwo consecutive
starting attempts via you rsmartphone. If you
insert the SmartKey into the ignitio nlock, you
can carry out two more starting attempts.
Once you have started the engine, you can
switch the engine off via you rsmartphone at any
time.
You can only start the engine via you rsmart-
phone if:
Rthe SmartKey is in the ignitio nlock
Rpark position Pis selected
Rthe accelerator pedalisn ot depressed
Rthe anti-theft alarm system is not activated
Rthe panic alarm is not activated
Rthe hazard warning lampsare switched off
Rthe hood is closed.
Rthe doors are closed and locked
Rthe windows and sliding sunroof are closed
Also make sure that:
Rthe fuel tank is sufficiently filled
Rthe starter battery is sufficiently charged
GWARNING
Limbs could be crushed or trappe difthe
engine is started unintentionally during ser-
vice or maintenance work. There is arisk of
injury.
Always secure the engine against uninten-
tional starting before carrying out mainte-
nance or repair work.
Make sure that the engine cannot be started via
you rsmartphone before carrying out mainte-
nance or repairs. You can prevent an engine
start via you rsmartphone, for example, if you:
Rswitch on the hazard warning lamps
Rdo not lock the doors
Ropen the hood
Pulling away
General notes
GWARNING
If the engine speedisa bove the idling speed
and you engage transmission position Dor R,
the vehicl ecould pul lawa ysuddenly.T here is
ar isk of an accident.
When engaging transmission position Dor R,
alway sfirmly depress the brake pedala nd do
not simultaneously accelerate.
Depress the accelerator carefully when pulling
away.
The vehicl elocks centrally once you have pulled
away. The locking knobs in the doors drop down.
You can open the doors from the insid eatany
time.
You can als odeactivate the automatic locking
feature, see the Digital Operator's Manual.
It is only possible to shift the transmission from
position Pto the desired position if you depress
the brake pedal. Only then is the parking lock
released. If you do not depress the brake pedal,
the DIRECT SELECT lever can still be moved but the parking lock remains engaged.
iUpshifts take place at highere ngine speeds
after acold start. This help sthe catalytic con-
verter to reach its operating temperature
more quickly.
Information on the automatic release of the
electric parking brake (
Ypag e154).
134Driving
Driving and parking

Hill start assist
Hill start assist helpsyou when pulling awa yfor-
wards or in reverse on an uphill gradient. It holds
the vehiclef oras hort time after you have
removed you rfoot from the brake pedal. This
gives you enoug htime to move you rfoot from
the brake pedaltot he accelerator pedala nd to
depress it before the vehicleb egins to roll.
GWARNING
After ashort time, hil lstart assist wil lnolon-
ger brake you rvehicl eand it coul droll away.
There is arisk of an accident and injury.
Therefore, quickly move you rfoot from the
brake pedaltot he accelerator pedal. Never
leave the vehiclew hen it is held by hillstart
assist.
Hill start assist is not active if:
Ryou are pulling awa yonalevelroad or on a
downhill gradient.
Rthe transmission is in position N.
Rthe electric parking brake is applied.
RESP®is malfunctioning.
ECOstart/stop function
Introduction
The ECO start/stop function switches the
engine off automatically if the vehicleiss topped
under certain conditions.
The engine starts automatically when the driver
wants to pul lawa ya gain. The ECO start/stop
function thereby help syou to reduce the fuel
consumption and emissions of you rvehicle.
Important safety notes
GWARNING
If the engine is switched off automatically and
you exit the vehicle, the engine is restarted
automatically .The vehiclem ay beginmoving.
There is arisk of accident and injury.
If you wis htoexit the vehicle, alway sturn off
the ignitio nand secure the vehiclea gainst
rolling away.
General notes
:ECO start/stop display
The ECO start/stop function is activated when-
ever you start the engine using the SmartKey or the Start/Stop button.
If the engine has been switched off automati-
call ybyt he ECO start/stop function, the è
ECO symbol is shownint he multifunction dis-
play.
Mercedes-AMG vehicles: the ECO start/stop
function is only available in drive program C.
Automatic engine switch-off
If the vehicleisb raked toastandstil lin D or N,
the ECO start/stop function switches off the
engine automatically.
The ECO start/stop function is operational
when:
Rthe indicator lamp in the ECO button is lit
green.
Rthe outside temperature is withi nthe range
that is suitable for the system.
Rthe engine is at normal operating tempera-
ture.
Rthe set temperature for the vehiclei nterior
has been reached.
Rthe battery is sufficiently charged.
Rthe system detects that the windshiel disnot
fogged up when the air-conditioning system is switched on.
Rthe hood is closed.
Rthe driver's door is closed and the driver's
seat beltisf astened.
All of the vehicle's systems remai nactive when
the engine is stoppeda utomatically.
The HOLD function can als obeactivated if the
engine has been switched off automatically .Itis
then not necessary to continue applying the
brakes during the automatic stop phase. When
you depress the accelerator pedal, the engine
starts automatically and the braking effect of
the HOLD function is deactivated.
Driving135
Driving and parking
Z

All vehicles (exceptMercedes-AMGvehi-
cles): automat icengines witch-off can take
plac eam aximum of four times inar ow (initial
stop, then three subsequents tops).
Mercedes-AM Gvehicles: then umber of con-
secutiv eautomat icengines witch-off sisunlimi-
te d.
Automatic engine start
The engines tartsa utomaticall yif:
Ryou switch off th eECO start /stopf unction by
pressingt heECO button
Ryou switch to driveprogram S+(all veh icles
excep tMercedes-AM Gvehicle s)
Ryou switch to driveprogram RACE
(S ‑MODEL), S+orS(Mercedes-AM Gvehicle s)
Ryou permanently activatem anual gearshifting
(Ypage 146) (Mercedes-AM Gvehicle s)
Rintransmission position Dor Ntheb rake
pedal isreleased and th eHOLDfunction isnot
active
Ryou depr ess th eaccelerato rpedal
Ryou engage revers egear R
Ryou mov ethe transmission out of position P
Ryou unfasten your seatbeltor open th edriv-
er' sd oor
Rthev ehicle start stor oll
Rtheb rak esystem requires th is
Rthet em peratur eintheveh icle interio rdevi-
ate sfromt heset range
Rthes ystem detect smoistur eont hewind -
shield when th eair-conditionin gsystem is
swit ched on
Rtheb attery's conditio nofcharge istool ow
Sh ifting th etransmission to position Pdoes not
start th eengine.
Deactivatin goractivatin gthe ECO
start/stop function
All vehicles (exceptM ercedes-AMGvehi-
cles)
XTo deactivate: press ECO button :.
In dicato rlamp ;goes out.
XTo activate: press ECO button :.
In dicato rlamp ;lightsu p.
If indicator lamp ;is off ,the ECO start/stop
function has been deactivate dmanually or as
th er esult of amalfunction. The enginew ill then
no tbes witched off automaticall ywhen th evehi-
cle stops.
Selecting driv eprogram S+deactivate sthe ECO
start /stopf unction.Ify ou press ECO button :,
th eE CO start/sto pfunction isactivated.
Mercedes-AM Gvehicles
XTo deactivate: press ECO button :.
In dicato rlamp ;goes out.
XTo activate: press ECO button :.
In dicato rlamp ;lightsu p.
If indicator lamp ;is off ,the ECO start/stop
function has been deactivate dmanually or as
th er esult of amalfunction. The enginew ill then
136Driving
Driving and parking

not be switched off automaticallywhenthe vehi-
cle stops.
The ECO start/stopf unctionisd eactivated, if:
Ryous witch to drive program RACE
(S‑MO DEL),S+orS(Ypage 139)
Ryo up ermanentlya ctivate manua lgearshifting
(Ypage 146)
If yo uhavep ermanentlya ctivatedmanual gear-
shifting and then press ECO button :,the ECO
start/stopf unctionisa ctivated.
AM Gsports exhausts ystem
(Mercedes AM Gvehicles)
Youc an choose between different AMG sports
exhaus tsystem volumes using the positio nof
the exhaus tflap.
Each time yo ustart the engine with the Smart-
Key or the Start/Stop button, the quietest set-
ting is activated.
Setting the volume:
XPress button :.
If yo uselect the loudest setting, indicator
lamp lights up ;.
Yo uc an also adjus tthe positio nofthe exhaust
fla pu sing the:
RDYNAMIC SELECTs witch (Ypage 139)
Rmultimedia system
Driving137
Driving an dparking
Z

Problems with the engine
ProblemPossible causes/consequences andMSolutions
The engine does not
start. The starter motor
can be heard.RThere isamalfunction in the engine electronics.
RThere is amalfunction in the fuel supply.
Before attempting to start the engine again:
XTurn the SmartKey back to position 0in the ignition lock.
or
XPress the Start/Stop button repeatedly until all indicator lamps in
the instrumentc luster go out.
XTry to start the engine again (Ypage 133). Avoid excessively long
and frequent attemptstos tart the engine as these will drain the
battery.
If the engine does not start after several attempts:
XConsult aqualified specialist workshop.
The engine does not
start. You cannot hear
the starter motor.The on-board voltage is too low because the battery is too weak or
discharged.
XJump-start the vehicle (Ypage 308).
If the engine does not start despite attempt stojump-start it:
XConsult aqualified specialist workshop.
The starter motor was exposed to athermal load that was too high.
XTry to start the engine again (Ypage 133).
If the engine still does not start:
XConsult aqualified specialist workshop.
The engine is not running
smoothly and is misfir-
ing.There is amalfunction in the engine electronics or in amechanical
componentoft he engine management system.
XOnly depress the accelerator pedal slightly.
Otherwise, non-combusted fuel may get into the catalytic converter
and damage it.
XHave the cause rectified immediately at aqualified specialist work-
shop.
The coolant temperature
gauge shows avalue
above 248 ‡(120 †).The coolant level is too low. The coolant is too hot and the engine is no
longer being cooled sufficiently.
XStop as soon as possible and allow the engine and the coolant to
cool down.
XCheck the coolant level (Ypage 290). Observe the warning notes
as you do so and add coolant if necessary.
138Driving
Driving and parking