engine MERCEDES-BENZ M-Class 2012 W166 Owner's Manual

Problem Possible
causes/co nsequences andM Solutions
֌
The
yello wESP ®
and
ESP ®
OFF warning
lamps arelitwhile the
engine isrunning. G
Risk
ofaccident ESP
®
,BAS ,PRE-SA FE®
,the HOLD function,hillstart assist and
ESP ®
trailer stabilization aretemporarily unavailable.
BAS PLUS andPRE-SA FE®
Brake mayalsohave failed.
ESP ®
will notstabilize thevehicle ifit starts toskid orifawheel
starts tospin.
Self diagnosis isnot yetcomplete.
The brake system continues tofunct ionnormally, butwithout the
funct ionslisted above. Thewheels couldtherefore lockifyou
brake hard,forexample.
ATTENTI ONASS ISTisdeactivated.
X Carefull ydrive asuitable distance makingslightsteering
movement sat aspeed above12mph (20km/ h).
The funct ionsment ioned above areavaila bleagain whenthe
warning lampgoesout.
If the warning lampisstill on:
X Observe theadditional displaymessages inthe multifunct ion
display .
X Drive oncarefully.
X Visit aqual ified specialist workshop. $
(USAonly)
! (Canada only)
The redindicator lamp
for the electric parking
brake flashes and/or
the yello w
!
warning lampforthe
electric parking brake
lights up. The
electric parking brakeistemporarily malfunctioningor
defective.
X Observe theadditional displaymessages inthe multifunct ion
display . 6
The
redSRS warning
lamp islit while the
engine isrunning. G
Risk
ofinjury The
restraint systemsaremalfunction ing.Theairbags orETDs
may either betriggered unintentionally or,inthe event ofan
accident, notbetriggered atall.
X Drive oncarefully.
X Visit aqual ified specialist workshop immediately. War
ning andindicator lampsin the instrum entcluster
275On-board computer and displays Z

G
WARNING In
the event amalfu nction ofthe SRS isindica tedasoutli nedabove,the SRS may notbe
opera tional.
For yoursafet y,we stron gly recomm endthat you contactana uth oriz edMer cedes-Ben zCent er
immediately tohave thesystem checked.Other wisetheSRS may notbeactivat edwhen needed
in an acciden t,which couldresult inserious orfatal injury, oritmight deploy unexpec tedlyand
unnec essarily whichcouldalsoresult ininjury. Engine
Problem Possible
causes/consequences andM Solutions
;
The
yellow Check
En gine warning lamp
lights upwhile the
engine isrunn ing. There
maybeamalfunct ion,forexample:
R in the engine managemen t
R in the fuel injec tionsystem
R in the exhaust system
R in the ignition system(forvehicles withagasoline engine)
R in the fuel system
The emission limitvalues maybeexceeded andtheengine may
be runn inginemergen cymode.
X Have thevehicle checkedassoon aspossible ataqualified
specialist workshop. i
In
some states,you arerequired bylaw toimmediately visita
qualified specialist workshop assoon asthe yellow Check
En gine warning lamplights up.Ifin doubt, checkwhether such
legal regulations applyinthe state/prov inceinwhich youare
current lydriving. Vehicles
withadiesel engine: thefuel tank hasbeen rundry
(Y page 152).
X Start theengine threetofour times afterrefueling.
If the yellow Check Enginewarning lampgoesout,emergency
running modeiscanceled. Thevehicle neednotbecheck ed. 8
The
yellow reserve fuel
warning lampflashes
while thevehicle isin
motion. Inaddition, the
yell ow Check Engine
warning lamp;
may light up. The
fuel system pressure istoo low. Thefuel filler capisnot closed
correct lyor the fuel system isleaking.
X Observe theadditional displaymessages inthe multifunction
displa y.
X Check thatthefuel filler capiscorrect lyclosed.
X Ifthe fuel filler capisnot correctly closed:close thefuel filler
cap.
X Ifthe fuel filler capisclose d:visit aqual ified specialist
workshop. 276
War
ning andindicator lampsin the instrum entclusterOn-board computer and displays

Problem Possible
causes/co nsequences andM Solutions
8
The
yello wreserve fuel
warning lamplights up
while theengine is
running. The
fuel level hasdropped intothereserve range.
X Refuel atthe nearest gasstation. ?
The
redcoolant
warning lamplights up
while theengine is
running andthecoolant
temperature gaugeis
at the start ofthe scale. The
temperature sensorforthe coolant temperature gaugeis
defective.
The coolant temperature isno longer beingmonitor ed.There isa
risk ofengine damage ifthe coolant temperature istoo high.
X Pull over andstop thevehicle safelyandswitch offthe engine,
payi ngatten tiontoroad andtraffic condition s.Do not cont inue
driving underanycircumst ances.
X Apply theelectric parking brake.
X Consult aqual ified specialist workshop. War
ning andindicator lampsin the instrum entcluster
277On-board computer and displays Z

Problem Possible
causes/co nsequences andM Solutions
?
The
redcoolant
warning lampcomes on
while theengine is
running. The
coolant levelistoo low.
If the coolant leveliscorrec t,the airflow tothe engine radiator
may beblocked orthe electric engineradiator fanmay be
malfunction ing.
The coolant istoo hotand theengine isno longer beingcooled
sufficiently.
X Observe theadditional displaymessages inthe multifunct ion
display .
X Pull over andstop thevehicle safelyandswitch offthe engine,
payi ngatten tiontoroad andtraffic condition s.
X Allow theengine andcoolant tocool.
X Check thecoolant levelandadd coolant (Ypage 315). Observe
the warning notes.
X Ifyou need toadd coolant moreoften thanusual,have the
engine coolant systemchecked.
X Make surethattheairsupply tothe engine radiator isnot
blocked, e.g.bysnow, slushorice.
X At coolant temperatures under248‡(120 †),drive tothe next
qualified specialist workshop.
X Avo idsubjec tingthe engin etoheavy loads, e.g.driving in
mountainous terrain,andstop- and-go traffic. ?
The
redcoolant
warning lampcomes on
while theengine is
runnin g.Awarning tone
also sounds. The
coolant temperat urehas exceeded 248‡(120 †).The
airflow tothe engine radiator maybeblocked orthe coolant level
may betoo low.
The engine isnot being cooled sufficient lyand may bedamaged.
X Observe theadditional displaymessages inthe multifunct ion
display .
X Pull over andstop thevehicle safelyandswitch offthe engine,
paying attentiontoroad andtraffic conditions.
X Allow theengine andcoolant tocool.
X Check thecoolant levelandadd coolant (Ypage 315). Observe
the warning notes.
X Ifyou need toadd coolant moreoften thanusual ,have the
en gin eco olan tsyst em checke d.
X Mak esur eth at theair supp lyto theen gin eradi ator isno t
bloc ked, e.g. by snow, slushor ice .
X At coolan ttemperatures under248‡(120 †),drive tothe next
qualified specialist workshop.
X Avo idsubjec tingthe engin etoheavy loads, e.g.driving in
mountainous terrain,andstop- and-go traffic. 278
War
ning andindicator lampsin the instru mentclusterOn-board computer and displays

G
WARNING Driving
whenyourengi ne isove rheatedcan causesom efluids which mayhave leaked intothe
engin ecom partmen ttocatch fire.Youcould beseriously burned.
Steam fromanoverheated enginecancause serious burnswhich canoccur justbyopening the
engine hood.Stayaway fromtheengine ifyou seeorhear steam coming fromit.
Stop thevehicle inasafe location awayfromother traffic.Turn offthe engine, getout ofthe
vehicle anddonot stand nearthevehicle untiltheengine hascooled down.
! Ifthe coolant temperature exceeds248‡(120 †)donot cont inue driving. Theengine will
otherwise bedamaged. Driving
systems Problem Possible
causes/cons equencesandM Solutions
·
The
reddistance
warning lamplights up
while thevehicle isin
motion .A warning tone
also sounds. G
Risk
ofaccident The
warning isissued ifyou approach astation aryvehicle ora
vehicle drivingaheadofyou attoo high aspeed.
X Be prepared tobrake immediately.
X Pay careful attentiontothe traffic situation. Youmay have to
brake ortake evasive action.
More informat ionabout DISTRONIC PLUS(Ypage 169)and
PRE-S AFE®
Brake (Ypage 65). War
ning andindicator lampsin the instru mentcluster
279On-board computer and displays Z

If
childre nopen adoor, theycould injure other
person sor get out ofthe vehicle andinjure
them selves orbe injured byfollowing traffic.
Do not expose thechild restraint system to
direct sunlight .The child restraint system's
metal parts, forexample, couldbecome very
hot, andthechild could beburned onthese
parts. G
WARNING Never
touchtheheating element orsides of
the lighter; theyareextrem elyhot. Hold the
knob only.
Make sureanychildren traveling withyoudo
not injure themselves orstart afire with the
hot cigarette lighter.
! The cigarette lighterinthe cent erconsole
in the front compartmen tis not inten ded
for operating thetire inflation compressor. X
Turn theSmartK eytoposition 2in the
ignition lock.
X To open: slidecover :fully forwards.
X Press incigarette lighter;.
Ciga rettelighter ;will pop out
automatically whentheheating element is
red-hot.
X To close :pull cover :fully back. 12
Vsocket s
Point sto obser vebefor euse Wit
hth eexc eption ofthesoc ket inthefron t
cen terc onsole, allsocket scan be used for
acc essorie swit hamax imum curren tdraw of
240 W(20 A),e.g. lamp sor charge rsfor
mobil ephones.
The socket inthe center console inthe front
compartment canbeuse dfor accesso ries,
e.g lamp sor mobil ephone chargerswith a
maximu mcurrent drawof180 W(15 A).
If you usethesockets forlong periods when
the engine isswi tched off,thebattery may
discha rge.
X Turn theSmartKey toposi tion 1in the
ignitio nlock. i
An
emergenc ycut- out ensures thatthe
on-board voltagedoesnotdrop toolow. If
the on-board voltageistoo low, thepower
to the socket sis automatically cut.This
ensures thatthere issufficient powerto
start theengine.
Socket inthe rear -compa rtment center
consol e X
Lift upthe cover ofsocket :.
Vehicles withtheRear SeatEntert ainment
System havetwosocket sin the cent er
console inthe rear compartm ent. Featur
es
297Stowing and features Z

enfor
cemen tagency isinfor med ofthe
location ofthe vehicle. i
If
the anti- theftalarm systemisact ive for
long erthan 30seco nds,mbrac e
autom atically inform sthe Merc edes- Benz
Custom erAss istanc eCent er. Gar
age door opener
Imp ortant safety notes The
Hom eLink®
garage dooropener
int egrat edinthe rear- view mirrorallows you
to operat eup tothr ee diff eren tdoor and gate
systems. i Certain
garagedoordrives are
incompat iblewith theintegr atedgarage
door opener. Ifyou have difficulty
programming theintegr atedgarage door
opener, contactanauthorized Mercedes-
Benz Center orcall one ofthe following
telephone hotlines:
R USA: Mercedes-B enzCustomer
Assist anceCenter at
1-8 00- FOR-ME RCedes
R Canada: Customer Serviceat
1-8 00- 387- 0100 G
WARNIN
G Before
programming theintegrat edremote
cont roltoagarage dooropener orgate
operator, makesurepeople andobject sare
out ofthe way ofthe device toprevent
potent ialharm ordamage. When
programming agarage dooropener, thedoor
moves upordown. Whenprogramming agate
operator, thegate opens orcloses.
Do not use theintegrat edremote controlwith
any garage dooropener thatlacks safety stop
and reverse features asrequired byU.S.
federal safetystandards (thisincludes any
garage dooropener modelmanufactured
before April1,1982 ).A garage doorthat
cann otdetect anobject -signaling thedoor to
stop andreverse -does notmeet current
U.S. federal safetystandards.
When programming agarage dooropener,
park vehicle outside thegarage.
Do not run theengine whileprogramming the
integrat edremote control.Inhalation of
exhaust gasishazardous toyour health. All
exhaust gascont ains carbon monoxide(CO),
and inhaling itcan cause unconsciousness
and possible death.Allexhaust gascont ains
carbon monoxide(CO), andinhaling itcan
cause unconsciousness andpossible death. i
USA
only:
This device complies withpart15ofthe
FCC Rules. Operation issubject tothe
following twocondit ions:
1. This device maynotcause harmful
interf erence, and
2. this device mustaccept anyinterf erence
received, includinginterference thatmay
cause undesired operation.
Any unauthorized modificationtothis
device couldvoidtheuser's authority to
operate theequipment.
FCC ID:CB2HMIH L4 i
Canada
only:
This device complies withRSS-2 10of
Industr yCanada. Operation issubject to
the following twocondit ions:
1. This device maynotcause interference,
and
2. this device mustaccept anyinterf erence
received, includinginterference thatmay
cause undesired operationofthe device.
Any unauthorized modificationtothis
device couldvoidtheuser's authority to
operate theequipment.
IC: 279B -HMIHL4 Featur
es
305Stowing and features Z

Useful
information........ .......... .......... 312
Engine compartment ........................ 312
Maint enance .................. .................... 317
Care ...................................... .............. 318 311Maintenance and care

Useful
information
i This
Operat or'sManual describesall
models andallstan dard andoption al
equipment ofyour vehicle available atthe
time ofpublication ofthe Operat or's
Manual. Country-specificdiffer encesare
possible. Pleasenotethat your vehicle may
not beequipped withallfeature s
descr ibed. Thisalso applies tosafet y-
related systemsand func tions. i
Please
readtheinfor mation onqualified
specialist workshops(Ypage 25). Engine
compartment Hood
Opening thehood G
WARN
ING Do
not pull therelease leverwhile thevehicle
is in mot ion. Othe rwise, thehood could be
forc edopen bypassing airflow.
This could cause thehood tocome looseand
inj ure you and/o rothe rs. G
WA
RNING Do
not open the hoodwh en the engineis
ove rheated.Yo ucou ldbe serio uslyinju red.
Ob serve the coolant temp eraturedisp layto
de term inewheth erthe enginemaybe
ove rheated.Ifyo use efla mes orsmo ke
comi ngfromthe enginecomp artment, move
aw ay fromt hevehicle. Waituntiltheengine
has cooled. Ifnecessary, callthefire
department. G
WARNING There
isarisk ofinjury ifthe hood isopen,
even ifthe engine isnot running.
Some engine componen tscan become very
hot.
To avoid therisk ofburns, onlytouch those
componen tsdescribed inthe Operator's
Manual andobserve therelevant safetynotes. G
WARNING To
help prevent personal injury,stayclear of
moving partswhen thehood isopen andthe
engine isrunning.
The radiator fanmay continue torun for
approximately 30seconds ormay even
restart aftertheengine hasbeen turned off.
Stay clear offan blades. G
WARNING Vehicles
withgasoline engine:
The engine isequipp edwith atransist orized
ignition system. Because ofthe high voltage
it is dangerous totouch anycomponen ts
(ignition coils,spark plugsocket s,diagnostic
socket )of the ignition system
R with theengine running
R while startin gthe engine
R when theignition isswitched onand the
engine isturned manually G
WARNING Vehicles
withdiesel engine:
The engine isequipp edwith ahigh-voltage
electronic controlunit forthe inject ion
system. Because ofthe high voltage itis
dangerous totouch anycomponen tsof the
inject ionsystem (injectors,electrical wires)
R with theengine running
R while startin gthe engine
R when theignition isswitched on
X Make surethatthewindshield wipersare
switched off. G
WARNING The
windshield wipersandwiper linkage
could beset inmotion.
When thehood isopen, youorothers could
be injured bythe wiper linkage.
Make surethatthewindshield wipersare
switched off.Remove theSmartKey ormake
sure thatnoignition position hasbeen
selected withKEYLES S-GO.Allindicator
lamps mustbeoff inthe instrumen tcluster. 312
Engi
necompar tmentMaintenance and care

X
Pull release lever:for the hood.
The hood isreleased.
! Make surethatthewindshield wipersare
not folded awayfromthewindshield. You
could otherwise damagethewindshield
wipers orthe hood. X
Reach intothegap, pullhood catch
handle ;upand liftthe hood.
Onc eyou have lifted thehood about
15 inches (40cm), itis automatically
opened therest ofthe way andheld open
by the gas-filled struts.
Closing thehood G
WARNIN
G When
closing thehood, useextreme caution
not tocatc hhands orfingers. Becareful that
you donot close thehood onanyone.
Make surethehood issecurely engaged
before driving off.Donot cont inue driving if
the hood cannolonger engage afteran
accident ,for example. Thehood could otherwise
comeloosewhilethevehicle isin
motion andinjure youand/or others.
X Lower thehood andletitfall from aheight
of approximately 8inches (20cm).
X Check thatthehood hasengaged properly.
If the hood canberaised slightly, itis not
properly engaged. Openitagain andclose
it with alittle more force. Rad
iator i
Vehicles
withadiesel engine: donot
cov erthe radiator ,for examp lewith a
wint erfron tor bug cover.The reading sof
the on-board- diagnos ticsyste mmay
ot her wise beinac curate.Some ofthese
readings arerequired bylaw and must be
accurate atall times. Engine
oil
Notes onthe oillevel Dependin
gon the driving style,thevehicle
consumes upto0.9 USqts. (0.8 l)of oil over
a distance of600 miles (1000 km).Theoil
consumpt ionmay behigher thanthiswhen
the vehicle isnew orifyou frequently driveat
high engine speeds.
Checking theoillevel using theoil
dipst ick Example:
vehicleswithagasoline engine Engine
compar tment
313Maintenance and care Z