2012 MERCEDES-BENZ M-Class Check engine

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

Furth
erinfor mationonengi neoil
(Y page 388). Che
cking and adding otherserv ice
pr odu cts
Checkin gth ecoolant level On
lyche ckthecoo lant level when theveh icle
is on alevel surface and theeng inehas cooled
down .
X Turn theSm artKey toposit ion
2 (Y page 139)intheign itio nlock .
On veh icleswith KEYLE SS-GO ,pres sth e
St art /S topbutt ontwic e(Ypage 139).
X Check thecoolant temperaturegauge in
the multifun ction display.
The coolant temperaturemustbebelow
158 ‡(70 †). G
WARN
ING In
order toavoid anypoten tiallyserious burns:
R use extreme caution whenopenin gthe
hood ifther eare any signs ofsteam or
coolant leakingfromthecoolin gsystem ,or
if the coolant temperaturedisplay indicates
that thecoolant isoverheat ed.
R do not remov ethe pressure caponthe
coolant reservoirifthe coolant temperature
is above 158‡(70 †). Allow theengine to
cool downbefore removin gthe cap. The
coolant reservoircon tains hotfluid andis
under pressure.
R using arag, slowly turnthecap
approximat ely1
/ 2 turn
torelieve excess
pressure. Ifopened immediately, scalding
hot fluid andsteam willbeblown outunder
pressure.
R do not spill antifreeze onhot engine parts.
An tifr eeze contains ethylene glycolwhich
may burn ifit comes intocontact with hot
engine parts. X
Slowly turncap:half aturn count er-
clock wiseandallow excesspressure to
escape.
X Turn cap:furth ercount er-clockwise and
remove it.
If the coolant isat the level ofmarker bar
= inthe filler neck when cold,there is
enough coolant incoolant expansion
tank ;.
If the coolant isapproximat ely0.6 in
(1.5 cm)above marker bar=inthe filler
neck when warm, thereisenough coolant
in coolant expansion tank;.
X Ifneces sary,addcoolant thathasbeen
test edand approved byMercedes- Benz.
X Replace cap:and turn itclock wiseasfar
as itwill go.
For furth erinfor mation oncoolant ,see
(Y page 389).
Windshield washersystemand
headla mpcleaning system The
washer fluidreservo iris used forboth the
windshield washersystemandtheheadlamp
cleanin gsystem. i
Vehicle
compon entsand their servic e
product smust match.You should,
theref ore,only useproduct sthat have been
test edand approved byMercedes- Benz.
Inf ormation ontest edand approved
product scan beobtained atany authorized
Mercedes- BenzCenter oron the Internet at
htt p://ww w.mbu sa.com (USAonly). Engine
compartment
315Maintenance and care Z

G
WARNING Wash
ersolve nt/antifreeze ishigh ly
flamma ble.Donot spill washer solvent/
antifreez eon hot engine parts,because itmay
ignite andburn. Youcould beseriously
burned.
! Attemperatures belowfreezin g:alwa ys
fill the washer fluidreservoir withamix of
water andwindshield washerconcentrate
(e.g. MBWinterF it).There isotherwise a
risk ofdamaging thewindshield washer
system/headlamp cleaningsystem.
! Only usewasher fluidconcentratewhich
is suitable forplastic lenses. Unsuitable
washer fluidconc entratecould damage the
plastic lensesofthe headlamps.
! Donot add distilled orde-ionized waterto
the washer fluidcontainer. Otherwise, the
level sensor maybedamaged. i
Add
windshield washerconcentrate, e.g.
MB SummerF it,to the washer fluidallyear
round. Example:
washerfluidreservoir
X Mix thewindshield washerfluidina
cont ainer beforehand.
X At temp eratures above freezing: fillthe
washer fluidreservoir withamixof water
and winds hieldwasher concentrate (e.g.
MB Summ erFit).
X At tem peratur es below freezing: fillthe
washer fluidreser voirwith amixof water
and winds hieldwasher concentrate (e.g.
MB Wint erFit).Adapt themixingratioto the outs
idetem perat ure.Forinform ation on
the mixing ratio(Y page 390).
X To open: pullcap:upwards bythe tab.
X Add theprem ixedwasher fluid.
X To close: presscap:ontothe filler neck
unt ilit eng ages.
Br ake fluid level !
Ifyou notice that thebrak efluid level in
the brak efluid reser voirhasfallen tothe
MIN mark orless, checkthe brak esyst em
immed iatelyforleaks. Alsocheckthe
thick ness ofthe brake linings. Contact a
qual ified specialist workshop, e.g.an
authorized Mercedes-Ben zCent er
immediately.
Do not add brake fluid.Thisdoes not
corr ectthe error.
Only checkthe brake fluidlevel when the
vehicle isstationary andonalevel surface.
In order tocheck thebrake fluidlevel, the
cover above thebrake fluidreservoir mustbe
removed. X
Remove seal;inthe area around
cover :inthe direction ofthe arrow. 316
Engi
necompar tmentMaintenance and care

electr
ostaticcharge ordue tospark
format ion.
! Befor eworkin gon the batter y,e.g.
loosenin gthe batter yterm inals, switch off
the engine andremove theSmart Keyfrom
the ignition .Onv ehicles withKEYLE SS-GO,
make surethattheignition isswitch edoff.
Check thatallthe indicat orlamps inthe
inst rument clusterareoff. You may
other wisedestr oyelectr oniccompon ents,
such asthe altern ator.
! Like other batter ies,thevehicle battery
may discharge overtime ifyou donot use
the vehicle. Inthis case have thebatter y
chec kedataqualified specialist workshop,
such asan authoriz edMercedes- Benz
Center .You can also charge thebattery
with acharger recomm endedbyMercedes-
Benz .Cont act anauthorized Mercedes-
Benz Center formore inform ation.
The battery andthecover ofthe positive
termin alclamp mustbeinstalled securely
during operation. i
Remove
theSmart Keyifyou park the
vehicle anddonot require anyelectric al
consumer s.The vehicle willthen usevery
little energy, thusconser vingbattery
power.
Mercedes-B enzrecomm endsthatyoudonot
carry outwork onbatteries yourself,e.g.
removing orcharging. Alwayshavethiswork
performed ataquali fiedspecialist workshop,
e.g. anauthorized Mercedes-B enzCenter. Charging
thebatt ery G
WARNIN
G Never
charge abattery stillinstalled inthe
vehicle unlessabattery charger unitapproved
by Mercedes-B enzisbeing used.Gases may
escape duringcharging andcause explosions
that may result inpaint damage, corrosion or
personal injury. Ab
attery charge runit spe cially ad apted for
Mer cedes-Be nzveh icles and teste dand
ap pro ved byMer cedes-Be nzisava ilab leas an
acce ssory.It pe rmi tsthe charging ofthe
ba ttery inits installed po sitio n.Co ntact an
au thor izedMer cedes-B enzCenter forfurther
info rma tiona nd ava ilab ility .
Ch arg ethe battery inacco rdance with the
sep arateins truc tions for the battery charger. G
WAR
NING The
reisaris ko facid burns during the
cha rging pro cess dueto the gases which
esca pefrom thebattery .Donot lean over the
battery duringthecharging process. G
WARNING Batt
eryacid iscaustic. Avoidcontactwith the
skin, eyesorclothin g.
! Only charge theinstalled batterywitha
battery charger whichhasbeen testedand
approved byMercedes-B enz.These battery
chargers allowthebattery tobe charged
while stillinstalled.
! Only usebattery chargers witha
maximum chargingvoltageof14.8 V.
! Only charge thebattery usingthejump-
start ingconn ection point.
The jump-st artingconnection pointisin the
engine compartm ent(Ypage 341).
X Open thehood (Ypage 312).
X Connect thebattery charger tothe positive
termin aland earth pointinthe same order
as when connectin gthe donor battery in
the jump-st artingprocedure
(Y page 341).
X Read thebattery charger's operating
instr uctions beforecharging thebattery. 340
Bat
teryBreakdown assistance

X
Turn theSmart Keytoposition 0(Y page 139)inthe ignition lockandremove it.On vehicles
with KEYLE SS-GO, make suretheignition isswitched off(Ypage 139). Allindicator lamps
in the instr ument cluster mustbeoff.
X Switc hoff allelectric alcons umers (e.g.radio, blower, etc.).
X Open thehood (Ypage 312). Position
numberBidentifies thecharged batteryofthe other vehicle oran equivalent jump-
start ingdevice.
X Slide cover :ofpositive terminal; inthe direction ofthe arrow.
X Connec tpositive terminal; onyour vehicle topositive terminal= ofdonor battery B
using thejumper cable,beginning withyour ownbattery.
X Start theengine ofthe donor vehicle andrunitat idling speed.
X Connect negative terminal? ofdonor battery Btoearth pointAofyour vehicle using
the jumper cable,connectin gthe jumper cabletodonor battery Bfirst.
X Start theengine.
X Allow theengine torun forafew minutes beforedisconn ectingthe jumper cable.
X First ,remove thejumper cablefromearth pointAand negative terminal?, then from
positive terminal; and positive terminal=, each timedisconn ectingfrom thecont acts
on your ownvehicle first.
X Aft erremoving thejumper cable,closecover :onpositive terminal;.
X Have thebattery checkedataquali fiedspecialist workshop, e.g.anauthorized Mercedes-
Benz Center. Thejump-st artingprocedure isnot astandard operating state;therefor e,have
the battery checked. 342
Jum
p-startingBreakdown assistance

the
colorand value. Th efuse rating sare listed
in thefuse allocation chart .
If ane wly inserted fuse alsoblows ,have the
caus etrace dand rectified ataqualif ied
spec ialist workshop,e.g. an auth orized
Mer cedes- BenzCent er.
! Only usefuses thathave been approved
for Mercedes- Benzvehicles andwhich
have thecorr ectfuse ratingfor the system
con cern ed.For thefuse boxes inthe engin e
compart mentandunder therear bench
seat, onlyusefuses withthesuffix "S".
Other wise, compon entsor systems could
be damaged. Befor
echanging afuse
X Park thevehicle andapply theelectr ic
parkin gbrake.
X Switc hoff allelectr icalconsumers.
X Remove theSmart Keyfrom theignition
lock.
The fuses arelocated invarious fuseboxes:
R fuse boxonthe fron t-passenger sideofthe
dashboard
R fuse boxinthe engin ecompart mentonthe
right- hand sideofthe vehicle, whenviewed
in the direct ionoftravel
R fuse boxunder therear bench seat
The fuse allocation chartislocated inthe fuse
box under therear bench seat(Ypage 347). Dashboar
dfuse box
! Donot use apoint edobjec tsuch asa
sc rewd river to open theco ver inthe
dash board.You could damag eth e
dash boardor theco ver . X
To open :pull cover :outwards inthe
dire ction ofthearr ow and remove it.
X To close: clipin co ver :atthef ront ofthe
das hboa rd.
X Fold cover :inwa rdsuntil itengag es. Fuse
boxinthe enginecompart ment
X Open thehood (Ypag e312). X
Remo veany existing moisturefrom the
fuse boxusing adry cloth.
X To open :open clamp s;.
X Fold cover :upw ards inthe direction of
the arrow andremove it.
! Make surethatnomoistu recan enter the
fuse boxwhen thecover isopen.
X To clo se: check whethe rthe seal islying
correct lyin cover :.
X Insert cover:into theretainers atthe side
of the fuse box.
X Fold down cover :and close clamps ;. 346
FusesBreakdown assistance

corro
sioninhi bitors withou tthese
characterist icsaffects theservice life.
The coolant mustbeused throughout theyear
in order tomaintain thenecessary corrosion
protect ionand toprovide protectionfrom
overheating. Inthe Service Booklet, youcan
find information onthe intervals forrenewal.
The renewal intervalisdetermined bythe
coolant typeandtheengine cooling system
design. Therenewal intervalinthe Service
Booklet isonly valid ifthe coolant isrenewed
or filled upwith Mercedes-Ben zapproved
product s.Therefo re,only useMB325 .0or
326 .0antic orrosion /antifreez eor anot her
Mercede s-Benz approved productofthe
same specific ation.
Inf ormat iononother product swith thesame
specific ationsthatareapproved by
Mercede s-Benz can beobtaine dat an
authoriz edMercede s-Benz Cente roro nthe
Int ernet athttp: //bevo.m ercedes-benz .com.
The coolant ischeck edatevery maintenanc e
interval atan authorized Mercedes-Ben z
Center.
The antifreez e/corrosion inhibitor
conc entration inthe engine cooling system
should:
R be atleast 50%.Thiswillprotect theengine
cooling systemagainst freezing downto
approximately -35‡(-37 †).
R not exceed 55%(antifreeze protectionto
-49 ‡[-45 †]);othe rwise, heatwillnot
dissipate aseffec tively.
If the coolan tlevel istoo low, MB325 .0or
326 .0ant icorr osion /antifreez eshould be
added. Havetheengin ecoolin gsystem
chec kedforpossible leaks. Wind
shield/h eadlampcleaning
syst em G
WARN
ING Washer
solvent/ant ifreez eis highly
flammable. Donot spill washer solvent/
ant ifreez eon hot engin eparts,bec ause itmay ign
ite and burn .You could beseriously
burned.
Use MBSummerF itwindshield washer
conc entrateattemperatures abovefreezin g:
X Mix 1part MBSummerF itwith 100parts
water.
Use MBWinterF itwindshield washer
conc entrateattemperatures belowfreezin g:
X At temperatures downto14 ‡(Ò10 †):
mix 1part MB WinterF itwit h2p artswate r.
X At temper aturesdown toÒ4 ‡ (Ò20 †):
mix 1part MBWinterF itwit h1 part wate r.
X At temper aturesdown toÒ20 .2‡
(Ò 29 †): mix2part sMB WinterF itwit h1
part wate r.
! OnlySum merFitand WinterF itcan be
mix ed. Other wise, theje ts could become
bloc ked. Veh
icle data Pleas
eno te that for thespec ifiedveh icle
dat a:
R theheig htsspec ifiedmay varyas ares ult
of:
- tires
- load
- co nd ition ofthesuspe nsion
- opt ionalequipm ent All
mod els Veh
icle lengt h 18
9.1in (48 04mm ) Veh
icle widt h
inclu dingext erior
mir rors 84
.3in(21 41mm ) Veh
icle heigh t 70
.7in(17 96mm ) Wh
eelba se 11
4.8in (29 15mm ) Fron
ttr ack 64
.7in(16 42mm ) Rea
rtr ack 65
.2in(16 57mm ) 390
Veh
icle dataTechnical data