engine MERCEDES-BENZ SLC-Class 2017 R172 Workshop Manual

Problems with the engine
ProblemPossible causes/consequences andMSolutions
The engine does not
start.The HOLD function or DistancePilot DISTRONIC is activated.
XDeactivatet he HOLD function (Ypage 148) or Distanc ePilot
DISTRONIC (Ypage 146).
XTry to start the engine again.
The engine does not
start. The starter motor
can be heard.RThere is amalfunction 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 116). 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 249).
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.
XAllow the starter motor to cool down for approximately two minutes.
XTry to start the engine again.
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.
120Driving
Driving and parking

ProblemPossible causes/consequences andMSolutions
The coolant temperature
gauge showsavalue
above 248 ‡(120 †).
The coolant warning
lamp may also be on and
aw arning tone may
sound.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 233). Observe the warning notes
as you do so and add coolant if necessary.
If the coolant level is correct,t he engine radiator fan may be faulty. The
coolant is too hot and the engine is no longer being cooled sufficiently.
XAt coolant temperatures below 248 ‡(120 †), drive to the nearest
qualified specialist workshop.
XAvoid heavy loads on the engine as you do so, e.g. driving in moun-
tainou sterrai nand stop-and-go traffic.
DYNAMIC SELEC Tbutton
Use the DYNAMIC SELECT button to change the
drive program. Depending on the drive program selected the following vehicle characteristics
wil lchange:
Rthe drive (engine and transmission manage-
ment)
Rthe suspension( vehicles with adaptive
adjustabl edamping or AMG sports suspen-
sion)
Rthe steering
Rthe availability of the ECO start/stop function
Each time you start the engine with the Smart-
Key or the Start/Stop button, drive program Cis
activated. For further information about starting
the engine, see (
Ypag e116).
XPress DYNAMIC SELECT button :as many
times as necessary until the desired drive
programiss elected.
The selected drive programa ppears in the
multifunction display. After ashort time the displayg
oes out and the status icon of the
selected drive programa ppears.
In addition, the current drive programs ettings
are displayed briefly in the multimedi asystem
display.
iIn af ew countries, the ECO start/stop func-
tion is deactivated at the factory due to the
available fuel grade. In this case, the ECO
start/stop function is not available in any
drive program, regardless of the displayint he
multimedi asystem display.
Availabl edrive programs:
CComfortComfortabl eand economi-
cal driving characteristics
S SportSporty driving characteris-
tics
S+ Sport PlusParticularly sporty driving
characteristics
IIndividualIndividua lsettings
EEconomyParticularly economical
driving characteristics
Additional information for drive programs
(Ypag e125).
DYNAMICS ELECTbutton121
Driving and parking
Z

Automa tict rans mi ssion
Import ant safety notes
GWARNIN G
If th eengines pee disa bovethe idlin gspee d
and you engage transmission position Dor R,
th ev ehicl ecould pull away suddenly. There is
ar iskofana ccident.
When engagin gtransmission position Dor R,
always firmly depress th ebrak epedal and do
no tsimultaneously accelerate .
GWARNING
The automatic transmission switches to neu-
tral position Nwhen you switch off th eengine.
The vehicl emay rol laway. There is ariskofa n
accident.
Afte rswitching off th eengine, always switch
to parking position P.Preven tthe parked vehi-
cle from rollin gaway by applyin gthe parking
brake.
Selector lever
Overview oftrans mission positions
!If th eengines pee dist oohigh or if th evehi-
cle is rolling, do no tshif tthe transmission
directl yfrom Dto R,f ro m Rto Dor directl yto
P.
Do no topen th edriver's door while th evehi-
cle is in motion .Atlow speeds in transmission
position Dor R,p ark position Pis otherwise
engage dautomatically.
The transmission could be damaged.
jPark position
kReverse gear
iNeutral
hDrive
The selector lever always return stoitsoriginal
position .The curren ttransmission position P,R,
N or Dappear sinthetransmission position dis-
play in th emultifunction display.
Trans mission position and drive pr o-
gram display
All vehicles (excep tMercedes-Benz SLC
43 AMG )
:Transmission position
;Gear
=Drive program
The curren ttransmission position and drive pro -
gram appear in th emultifunction display.
Mercedes-Benz SLC 43 AMG
:Transmission position
;Drive program
122Automatic transmission
Driving an dparking

The current transmission position and drive pro-
gram appear in the multifunction display.
Engaging parkposition P
XWhen the vehicle is stationary, depress the
brake pedal.
XPress button:.
Engaging parkp ositionPautomatically
Park position Pis automatically engaged if:
Ryou switch off the engine using the SmartKey
and remove the SmartKey
Ryou switch off the engine using the SmartKey
or using the Start/Stop button and open the
driver's door or front-passenger door
Rthe driver's door is opened when the vehicle is
stationary or driving at very low speed and the
transmission is in position Dor R
Under certain conditions, the automatic trans-
mission shifts automatically to transmission
position Pif the HOLD function or Distance Pilot
DISTRONIC is activated. Observe the informa-
tion on the HOLD function (
Ypage 148) and on
Distance Pilot DISTRONIC (Ypage 144).
Engaging reverse gear R
!Only shift the automatic transmission to R
when the vehicle is stationary.
XDepress the brake and keep it pressed.
XPush the selector lever forwards past the first
point of resistance.
The ECO start/sto pfunction is not available
when reverse gear is engaged. Further informa-
tion on the ECO start/sto pfunction
(
Ypage 118).
Shifting to neutral N
GWARNING
If children are left unsupervised in the vehicle,
they could:
Ropen the doors, thus endangeringo ther
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.
Rshiftin gthe automatic transmission out of
park position P
RStart the engine.
There is arisk of an accident and injury.
When leaving the vehicle, alwayst ake 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.
XWhen the vehicle is stationary, depress the
brake pedal.
XPush the selector lever forwards or back to
the first point of resistance.
If you switch the engine off with the transmis-
sion in position Ror D,t he automatic transmis-
sion shifts to Nautomatically.
With the SmartKey: if you then open the driv-
er's door or the front-passenger door or remove
the SmartKey from the ignition, the automatic
transmission shifts to Pautomatically.
With KEYLESS-GO: if you then open the driver's
or front-passenger door, the automatic trans-
mission shifts to P.
If you want the automatic transmission to
remain in neutral N,e .g. when having the vehicle
cleaned in an automatic car wash with atowing
system:
XVehicles with KEYLESS-GO: remove the
Start/Stop button from the ignition lock.
XInsert the SmartKey into the ignition lock.
XAll vehicles: switch the ignition on.
XDepress the brake pedal and keep it
depressed.
XShift to neutral N.
Automatic transmission123
Driving and parking
Z

XReleasethe brak epedal .
XReleas ethe electric parking brake.
XSwitc hoff th eignition and leav ethe SmartKey
in th eignition lock.
Engaging drive position D
XWhen th evehicl eiss tationary, depress th e
brak epedal .
XPush th eselector lever bac kpast th efirst
poin tofr esistance.
Transmission positions
BParkposition
This prevents th evehicl efromr ollin g
away when stopped.
Only shif tthe transmission int oposi-
tion Pwhen th evehicl eiss tationary
(
Ypage 122). The parking loc k
should no tbeused as abrak ew hen
parking .Always apply th eelectronic
parking brak einaddition to th epark -
ing loc kinorder to secure th evehi-
cle .
If th eSmartKey is remove dfromt he
ignition lock, th etransmission is
locked.
The automatic transmission shifts
int oP automatically:
Rwhen th eSmartKey is remove d
from th eignition loc k
Rwhen theengineiss witched off
wit hthe transmission in position R
or Dand on eofthedoor sis
opened
If th evehicl eelectronics are malfunc -
tioning ,the transmission may be
locke dinposition P.Havet he vehicl e
electronics checke dimmediately at a
qualified specialist workshop.
CRevers egear
Only shif tthe transmission int oposi-
tion Rwhen th evehicl eiss tationary.
ANeutral
Do no tshif tthe transmission to N
while driving .Otherwise, th eauto -
matic transmission could be dam-
aged.
No powe ristransmitte dfromt he
engin etothedriv ewheels.
Releasing th ebrak epedal will allow
you to mov ethe vehicl efreely, e.g. to
push it or to wit.
If ES P
®is deactivated or faulty: shif t
th et ransmission only to position Nif
th ev ehicl eisind anger of skidding,
e.g. on icy roads.
!Rollin ginneutral Ncan damag e
th ed rivet rain.
7Drive
The automatic transmission changes
gear automatically. All forward gear s
are available.
Driving tips
Changing gear
The automatic transmission shifts to th eindi-
vidual gear sautomatically when it is in trans -
mission position D.This automatic gear shifting
behavior is determine dby:
Rthes elected driv eprogram
Rthep osition of th eaccelerato rpedal
Rther oad spee d
Accelerator pedal position
Your style of driving influence show th eauto -
matic transmission shifts gear :
Rlittlethrottle: earl yupshift s
Rmorethrottle: lat eupshift s
124Automati ctransmission
Driving and parking

Kickdown
Use kickdown for maximum acceleration.
XDepress theaccelerato rpedal beyon dthe
pressur epoint.
The automatic transmission shift stoalower
gear depending on th eengines peed.
XEas eoff th eaccelerato rpedal once th e
desire dspeed is reached.
The automatic transmission shift sbacku p.
Drive programs
Drive program C(Comfort)
Drive progra mCis characterized by th efollow-
ing :
Rthev ehicl edelivers comfortable, economical
handlin gcharacteristics .
Rthev ehicl epulls away mor egentl yinf orward
and revers egears, unless th eaccelerato r
pedal is depressed fully.
Rth ev ehicl ehas improved drivin gstability, for
exampl eonslipperyroad surfaces.
Roptimal fuel consumption resulting from th e
automatic transmission shifting up sooner.
The vehicl eisdriven in th elow engin espee d
range and th ewheels are less likely to spin .
Rthes uspension exhibits comfortable damping
setting s(vehicles wit hadaptive adjustable
damping or AM Gsport ssuspension).
Rthes teering exhibits acomfo rtable steering
curve.
Drive program S(Sport )
Drive progra mSis characterized by th efollow-
ing :
Rthev ehicl eexhibits sport ydrivin gcharacter-
istics .
Rthev ehicl epulls away in first gear .
Rthea utomatic transmission shift suplater.
The fuel consumption possibl ybein gh igher
as aresult of th elater automatic transmission
shift points .
Rthes uspension exhibits fir mdamping set -
ting s(vehicles wit hadaptive adjustable
damping or AM Gsport ssuspension).
Rthes teering exhibits asport ysteering curve.
Drive program S+ (Sport Plus)
Drive programS+ is characterized by th efol-
lowing:
Rth ev ehicl eexhibits particularly sport ydrivin g
characteristics .
Rthev ehicl epulls away in first gear .
Rthea utomatic transmission shift suplater.
The fuel consumption possibl ybein gh igher
as aresult of th elater automatic transmission
shift points .
Rthes uspension exhibits particularly fir m
damping setting s(vehicles wit hadaptive
adjustable damping or AM Gsport ssuspen -
sion).
Rth es teering exhibits asport ysteering curve.
Rth eE CO start/sto pfunction is no tavailable.
Drive program I(Individual)
In drive progra mIth ef ollowin gproperties of th e
drive progra mcan be selected:
Rthed rive (engin eand transmission manage-
ment)
Rth es uspension (vehicles wit hadaptive
adjustable damping or AM Gsport ssuspen -
sion )
Rthes teering
Rth ea vailabilit yoftheECO start/sto pfunction
Information about configuring drive progra mI
wit hthe multimedia system can be found in th e
Digital Operator' sManual.
Drive program E(Economy)
Drive progra mEis characterized by th efollow-
ing :
Rthev ehicl eexhibits comfortable, economical
handlin gcharacteristics .
Rthev ehicl epulls away mor egentl yinf orward
and revers egears, unless th eaccelerato r
pedal is depressed fully.
Rth ev ehicl ehas improved drivin gstability, for
exampl eonslipperyroads urfaces.
Roptimal fuel consumption resulting from th e
automatic transmission shifting up sooner.
The vehicl eisdriven in th elow engin espeed
range and th ewheels are less likely to spin .
Rthes uspension exhibits comfortable damping
setting s(vehicles wit hadaptive adjustable
damping or AM Gsport ssuspension).
Automatic transmission12 5
Driving an dparking
Z

Rduring deceleration, the engineisdisconnec-
ted from the drive train .The vehicle uses
kinetic energy and consumes less fuel (coast-
ing mode).
Rthe steering exhibit sacomfortable steering
curve.
Manual gear shifting
General notes
You can chang egear yourself using the steering
wheel paddle shifters. The transmission must be
in position D.
Depending on which steering wheel paddle
shifter is pulled, the automatic transmission
immediately shiftsi ntot he nex tgear down or
up, if permitted.
To use manual shifting, you have two options:
Rtemporary setting
Rpermanen tsetting
If you activate manual gearshifting, the multi-
function display will show the currentg ear
instead of transmission position D.
If manual gearshifting is deactivated, the gears
will be selected automatically.
Temporary setting
XTo activate: shift the selector lever to posi-
tion P.
XPull steering wheel paddle shifter :or;.
Temporary setting will be activ efor ac ertain
amount of time. Under certain condition sthe
minimum amount of time is extended, e.g. in the
case of lateral acceleration, during an overrun
phase or when driving on steep terrain.
XTo deactivate: pull steering wheel paddle
shifter ;and hold it in place.
or
XUse the lever to switch the transmission posi-
tion.
or
XUse the DYNAMIC SELECT butto ntochange
the drive program.
Permanent setting
XTo activate: shift the selector lever to posi-
tion P.
XPress button :.
XTo deactivate: press button:.
Shifting gears
All vehicles (except Mercedes-Benz SLC
43 AMG)
XTo shift up:pull steering wheel paddle
shifter ;.
The automatic transmission shiftsuptot he
nex tgear.
If the maximum engin espeed on the currently
engaged gear is reached and you continue to
126Automatic transmission
Driving and parking

accelerate,the automatic transmission auto-
matically shifts up in orde rtoprevent engine
damage.
XTo shif tdown: pull steering wheel paddle
shifter :.
The automatic transmission shifts down to
th en extg ear.
Automatic down shiftin goccurs when coast-
ing.
If th eengine exceeds th emaximum engine
speedw hen shiftin gdown,t heautomatic
transmission protect sagainst engine damage
by no tshiftin gdown.
Mercedes-Ben zSLC 43 AMG
!If manual gearshiftin gispermanently acti-
vated, th eautomatic transmission does not
shiftupa utomatically even when th eengine
limiting speedf or thecurren tgear is reached.
When th eengine limiting speedisr eached,
th ef uel supply is cut to prevent th eengine
from overrevving .Always makes ure that the
engine speedd oes notreac hthe red area of
th et achometer. Thereiso therwise arisk of
engine damage.
XTo shif tup:pull steering wheel paddle
shifter ;.
The automatic transmission shifts up to the
nex tgear.
XTo shif tdown: pull steering wheel paddle
shifter :.
The automatic transmission shifts down to
th en extg ear.
Automatic down shiftin goccurs when coast-
ing.
If th eengine exceeds th emaximum engine
speedw hen shiftin gdown,t heautomatic
transmission protect sagainst engine damage
by no tshiftin gdown.
Shiftr ecommendation
All vehicles (exceptM ercedes-BenzSLC
43 AMG)
The gearshiftr ecommendations assisty ou in
adopting an economical driving style. The rec-
ommended gear is shownint hemultifunction
display.
XShift to recommended gear ;according to
gearshiftr ecommendation :when showni n
th em ultifunction display of th einstrument
cluster.
Mercedes-Ben zSLC 43 AMG
The gearshiftr ecommendations assisty ou in
adopting an economical driving style. The rec-
ommended gear is shownint hemultifunction
display.
XShift to recommended gear ;according to
gearshiftr ecommendation :when showni n
th em ultifunction display of th einstrument
cluster.
Kickdown
XFor maximum acceleration, depress the
accelerato rpedal beyondt hepressure point.
The automatic transmission shifts to alower
gear dependingont heengine speed.
XShift back up once th edesired speedi s
reached.
During kickdown, you canno tshiftg earsu sing
th es teering wheel paddle shifters.
If you apply full throttle ,the automatic trans-
mission shifts up to th enextg ear when the
Automatic transmission127
Driving and parking
Z

maximumengine speed is reached. This pre-
vents the engine from overrevving.
128Automatic transmission
Driving and parking

Problems with the transmission
ProblemPossible causes/consequences andMSolutions
The transmission has
problems shifting gear.The transmission is losing oil.
XHave the transmission checked ataqualified specialist workshop
immediately.
The acceleration ability
is deteriorating.
The transmission no lon-
ger changes gear.The transmission is in emergency mode.
It is only partly possible to engage the gears or the transmission is in
position N.
XStop the vehicle.
XShift the transmission to position P.
XSwitch off the engine.
XWait at least ten seconds before restarting the engine.
XShift the transmission to positionDor R.
XHave the transmission checked at aqualified specialist workshop
immediately.
Refueling
Important safety notes
GWARNING
Fuel is highly flammable. If you handle fuel
incorrectly, there is arisk of fire and explo-
sion.
You must avoid fire, open flames, creating
sparks and smoking. Switch off the engine
and, if applicable, the auxiliary heating before refueling.
GWARNING
Fuel is poisonous and hazardous to health.
There is arisk of injury.
You must make sure that fuel does not come into contact with your skin, eyes or clothing
and that it is not swallowed. Do not inhale fuel
vapors. Keep fuel away from children.
If you or others come into contact with fuel,
observe the following:
RWash away fuel from skin immediately
using soap and water.
RIf fuel comes into contact with your eyes,
immediately rinse them thoroughly with
clean water. Seek medical assistance with-
out delay.
RIf fuel is swallowed, seek medical assis-
tance without delay.Don ot induce vomit-
ing.
RImmediately change out of clothing which
has come into contact with fuel.
GWARNING
Electrostatic buildupc an create sparks and
ignite fuel vapors. There is arisk of fire and
explosion.
Always touch the vehicle body before opening
the fuel filler flap or touching the fuel pump
nozzle. Any existing electrostatic buildupi s
thereby discharged.
Do not get into the vehicle again during the refu-
eling process. Otherwise, electrostatic charge
could build up again.
!Do not use diesel to refuel vehicles with a
gasoline engine. Do not switch on the ignition
if you accidentally refuel with the wrong fuel.
Otherwise, the fuel will enter the fuel system. Even small amounts of the wrong fuel could
result in damage to the fuel system and the
engine. Notify aqualified specialist workshop
and have the fuel tank and fuel lines drained
completely.
Refueling129
Driving and parking
Z