check engine MERCEDES-BENZ CLS 2014 Service Manual

!Make sure that the windshieldwipers are
not folded away fromthe windshield. You
could otherwise damage the windshield
wipers or the hood.
XMake sure that the windshield wipers are
turned off.
XPull release leveron the hood.
The hood is released.
XReach into the gap, pull hood catch
handleup and lift the hood.
If you lift the hood by approximately
15 inches(40cm),the hood is opened and
held open automatically by the gas-filled
strut.
Closing thehood
XLower the hood and let it fall fromaheight
of approximately8inches(20 cm).
XCheck that the hood has engaged properly.
If the hood can be raised slightly,itisnot
properly engaged. Open it again and close
it withalittle more force.
Engine oil
General notes
Depending on the driving style, the vehicle
consumesupto0.9 US qt (0.8 liters) of oil
overadistanceof600 miles(1,000 km). The
oil consumption may be higher than this when
the vehicle is new or if you frequently drive at
high enginespeeds.
Depending on the engine, the oil dipstickmay
be inadifferent location.
When checking theoil level:
Rpark thevehicle onalevelsurface.
Rtheengineshould be switched off for
approximately fiveminutesiftheengineis
at normal operatingtemperature.
Rif theengineisnotat normal operating
temperature, e.g.ifthe engine was only
started briefly, wait about 30 minutes
before carrying out the measurement.
Checking the oil level using the oil
dipstick
XPull oil dipstickout of the dipstick guide
tube.
XWipe off oil dipstick.
XSlowly slide oil dipstickinto the guide
tube to the stop, and take it out again.
If the level is between MIN mark$and
MAX mark,the oil level is correct.
XIf the oil level has dropped to MIN mark
$or below, add 1.1 US qt (1.0 liter) of
engine oil.
Engine compartment307
Maintenance and care
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Adding engineoil
GWARNING
If engineoil comes intocontactwithhot
componentsintheenginecompartment, it
may ignite. There isariskoffireand injury.
Makesurethatengineoil is notspilled next
to the filler neck. Let the enginecool down
and thoroughly clean the engineoil off the
componentsbefore starting the engine.
HEnvironmental note
When adding oil, take care not to spill any. If
oil enters the soil or waterways, it is harmful
to the environment.
!Only use engineoils and oil filtersthat
have been approved for vehicles with a
servicesystem. You can obtainalist of the
engineoils and oil filterstested and
approved in accordance with the
Mercedes-Benz Specificationsfor Service
Productsatany Mercedes-Benz Service
center.
Damage to the engineorexhaust system is
caused by the following:
Rusing engineoils and oil filtersthat have
not been specifically approved for the
servicesystem
Rreplacing engineoil and oil filtersafter
the interval for replacementspecified by
the servicesystem has been exceeded
Rusing engineoil additives.
!Do not add too much oil. adding too much
engineoil can result in damage to the
engineortothe catalytic converter. Have
excess engineoil siphoned off.
Example: engineoil capXTurn capcounter-clockwise and remove
it.
XAdd engineoil.
If the oil level is at or below the MIN mark
on the oil dipstick, add 1.1 US qt(1.0 liter)
of engine oil.
XReplace capon the fillerneck and turn
clockwise.
Ensurethatthe cap locks into place
securely.
XCheck the oillevel againwith the oil
dipstick (Ypage 307).
Further information on engine oil
(Ypage 375).
Additionalservice products
Checking coolant level
GWARNING
The engine cooling system is pressurized,
particularly when the engine is warm. When
opening the cap, you could be scaldedbyhot
coolantspraying out. There isarisk of injury.
Let the enginecool down before openingthe
cap. Wear eye and hand protection when
openingthe cap. Open the cap slowly half a
turn to allow pressure to escape.
308Engine compartment
Maintenance and care

XPark the vehicle onalevel surface.
Only check the coolant level when the
vehicle is onalevel surface and the engine
has cooled down.
XTurn the SmartKey to position2in the
ignition lock (Ypage 147).
On vehicles with KEYLESS-GO, press the
Start/Stop button twice (Ypage 147).
XCheck the coolant temperature display in
the instrument cluster.
The coolant temperature must be below
158‡(70 †).
XTurn the SmartKey to position
0(Ypage 147) in the ignition lock.
XSlowly turn caphalfaturn counter-
clockwise to allow excess pressure to
escape.
XTurn capfurther counter-clockwise and
remove it.
If the coolant is at the level of marker bar
$in the filler neck when cold, there is
enough coolant in coolant expansion
tank.
If the coolant level is approximately 0.6 in
(1.5 cm) above marker bar$in the fuel
filler neck when warm, there is enough
coolant in expansion tank.
XIf necessary, add coolant that has been
tested and approved by Mercedes-Benz.
XReplace capand turn it clockwise as far
as it will go.
For further information on coolant,see
(Ypage 377).
Adding washer fluid to the windshield
washer system/headlampcleaning
system
GWARNING
Windshield washer concentrate is highly
flammable. If it comes intocontactwith hot
enginecomponentsorthe exhaust systemit
could ignite. There isariskoffire and injury.
Make sure that no windshield washer
concentrate is spilled nexttothe filler neck.
XTo open:pull capupwards by the tab.
XAdd the premixed washer fluid.
XTo close:press capontothe filler neck
until it engages.
The washer fluid reservoir is used for both the
windshield washer system and the headlamp
cleaning system.
If the washer fluid level drops below the
recommended minimum of1liter,amessage
appears in the multifunction display
promptingyou to refill the washer fluid
(Ypage 262).
Further information on windshield washer
fluid/antifreeze (Ypage 378).
Maintenance
ASSYST PLUS
Service messages
The ASSYSTPLUS service interval display
informsyou of the nextservice due date.
Maintenance309
Maintenance and care
Z

Under these or similarconditions, have, for
example, the air filter, engine oil and oil filter
replaced or changed more frequently. Under
arduous operating conditions, the tires must
be checked more often.Further information
can be obtained ataqualified specialist
workshop, e.g. an authorized Mercedes-Benz
Center.
Driving abroad
An extensive Mercedes-Benz Servicenetwork
is also available in other countries. You can
obtain further information from any
authorized Mercedes-Benz Center.
Care
General notes
HEnvironmental note
Dispose of empty packagingand cleaning
clothsinanenvironmentally responsible
manner.
!For cleaningyour vehicle, do not use any
of the following:
Rdry, rough or hard cloths
Rabrasive cleaningagents
Rsolvents
Rcleaningagents containingsolvents
Do not scrub.
Do not touch the surfaces or protective
films with hard objects, e.g.aring or ice
scraper. You could otherwise scratch or
damage the surfaces and protective film.
!Do not park the vehicle for an extended
period straight after cleaningit, particularly
after having cleaned the wheels with wheel
cleaner. Wheel cleaners could cause
increased corrosion of the brake discs and
brake pads/linings. For this reason, you
should drive forafew minutes after
cleaning. Braking heats the brake discs and
the brake pads/linings, thus drying them.
The vehicle can then be parked.
Regular care of your vehicle isacondition for
retaining the quality in the long term.
Use care productsand cleaningagents
recommended and approved by Mercedes-
Benz.
Washing the vehicle and cleaning the
paintwork
Automatic car wash
GWARNING
Braking efficiency is reduced after washing
the vehicle. There isarisk of an accident.
After the vehicle has been washed, brake
carefully while paying attention to the traffic
conditions until full brakingpower is restored.
!If DISTRONIC PLUS or the HOLD function
is activated, the vehicle brakes
automatically in certain situations. To
preventdamage to thevehicle,deactivate
DISTRONICPLUS and the HOLD function in
the following or other similar situations:
Rwhen towing the vehicle
Rin the car wash
!Never clean yourvehicle inaTouchless
Automatic Car Wash as these use special
cleaningagents.These cleaning agents can
damage the paintwork or plastic parts.
!Make sure that:
Rthe side windows and the sliding sunroof
are fully closed.
Rthe ventilation/heating is switched off
(the OFF button has been pressed).
Rthe windshield wiper switch is in position
0.
Otherwise, the vehicle might be damaged.
!In car washes withatowing mechanism,
make sure that the automatic transmission
is in transmission positionN,otherwise the
vehicle could be damaged.
RVehicles withaSmartKey:
Care311
Maintenance and care
Z

Alignment bolt
%Sheet for faulty wheel
Tire inflation compressor
Lugwrench
Fuseallocation chart
XOpenthe trunk lid.
XLift the trunk floor upwards (Ypage 283).
Flat tire
Preparing the vehicle
Your vehicle may be equipped with:
RMOExtended tires (tires with run-flat
properties) (Ypage 321)
Vehicle preparation is not necessary on
vehicles with MOExtended tires.
Ran emergency spare wheel(Ypage 367)
Information on changing/mountingawheel
(Ypage 357).
XStop the vehicle on solid, non-slippery and
level ground, as far away as possible from
traffic.
XSwitch on the hazard warning lamps.
XSecure the vehicle against rolling away
(Ypage 167).
XIf possible, bring the front wheels into the
straight-ahead position.
XVehicles with AIRMATIC: make sure that
"normal" level is selected (Ypage 189).
XSwitch off the engine.
XVehicles without KEYLESS-GO:remove
the SmartKey from the ignition lock.
XVehicles with KEYLESS-GO:open the
driver's door.
The on-board electronicsnow have status
0.This is the same as the SmartKey having
been removed.
XVehicles with KEYLESS-GO:remove the
Start/Stop button from the ignition lock
(Ypage 147).
XAll occupants must get out of the vehicle.
Make sure that they are not endangered as
they do so.
XMake sure that no one is near the danger
area whileawheel is being changed.
Anyone who is not directly assisting in the
wheel change should, for example, stand
behind the barrier.
XGet out of the vehicle. Pay attention to
traffic conditionswhen doing so.
XClose the driver's door.
MOExtended tires (tires with run-flat
properties)
General notes
With MOExtended tires (tires with run flat
characteristics), you can continue to drive
your vehicle even if there isatotal loss of
pressure in one or more tires. The affected
tire must not show any clearly visible damage.
You can recognizeMOExtended tires by the
MOExtended marking which appears on the
sidewall of the tire. You will find this marking
next to the tire size designation, the load-
bearing capacity and the speed index
(Ypage 351).
MOExtended tires may only be used in
conjunction with an active tire pressure loss
warning system or with an active tire pressure
monitor.
If the pressureloss warning message
appearsinthe multifunction display:
RObserve the instructions in the display
messages (Ypage 258).
RCheck the tire for damage.
RIf driving on, observe the following notes.
The maximum driving distance is
approximately 50 miles (80 km) when the
vehicle is partially laden and approximately
18 miles (30 km) when the vehicle is fully
laden.
Flat tire321
Breakdown assistance

Beforehandling the battery,touch the vehicle
bodytoremove any existing electrostatic
build-up.
The highly flammable gasmixture forms when
charging the battery as well as whenjump-
starting.
Always makesure that neither you northe
battery is electrostatically charged.Abuild-
up of electrostaticcharge can be caused, for
example:
Rby wearing clothing made from synthetic
fibers
Rdue to friction between clothing and seats
Rif you push or pull the battery across the
carpet or other synthetic materials
Rif you wipe the battery withacloth
GWARNING
During the charging process,abattery
produces hydrogen gas. Ifashort circuit
occurs or sparks are created, the hydrogen
gas can ignite. There isarisk of an explosion.
RMake sure that the positive terminal of a
connected battery does not come into
contact with vehicle parts.
RNever place metal objectsortools on a
battery.
RIt is important that you observe the
described order of the battery terminals
when connecting and disconnecting a
battery.
RWhen jump-starting, make sure that the
battery poles with identical polarity are
connected.
RIt is particularly important to observe the
described order when connecting and
disconnecting the jumper cables.
RNever connect or disconnectthe battery
terminals while the engine is running.
GWARNING
Batteryacid is caustic. There isarisk of injury.
Avoid contact with the skin, eyes or clothing.
Do not inhale any battery gases. Do not lean
over the battery. Keep children away from
batteries. Wash battery acid immediately with
water and seek medical attention.
HEnvironmental note
Batteries contain dangerous
substances. It is against the
law to dispose of them with
the household rubbish. They
must be collected separately
and recycled to protect the
environment.
Dispose of batteries in an
environmentally friendly
manner. Take discharged
batteries toaqualified
specialist workshop or a
special collection point for
used batteries.
!Have the battery checked regularly at a
qualified specialist workshop.
Observe the service intervals in the
MaintenanceBooklet or contactaqualified
specialist workshop for more information.
!You should have all work involving the
battery carried out ataqualified specialist
workshop. In theexceptional casethatitis
necessaryfor you to disconnect thebattery
yourself, makesure that:
Ryou switch off theengineand remove the
SmartKey. On vehicles withKEYLESS-
GO, ensure that theignition is switched
off.Check that all the indicator lamps in
the instrumentcluster are off.Otherwise,
electroniccomponents, such as the
alternator,may be damaged.
Ryou first remove the negative terminal
clamp and then the positive terminal
clamp. Never swap the terminal clamps.
Otherwise, the vehicle's electronic
system may be damaged.
Rthe transmission is locked in positionP
after disconnectingthe battery. The
vehicle is secured against rolling away.
You can then no longer move the vehicle.
Battery (vehicle)323
Breakdown assistance
Z

over the battery. Keep children away from
batteries. Wash battery acid immediately with
water and seek medical attention.
GWARNING
Adischarged battery can freeze at
temperatures below freezingpoint.When
jump-starting the vehicle or charging the
battery, gases can escape from the battery.
There isarisk of an explosion.
Allow the frozen battery to thaw out before
charging it or jump-starting.
!Only use battery chargers with a
maximum charging voltage of 14.8 V.
!Only charge the battery using the jump-
startingconnection point.
The jump-starting connection point is in the
engine compartment(Ypage 326).
XOpen the hood (Ypage 306).
XConnect the battery charger to the positive
terminal and ground point in the same
order as when connecting the donor
battery in the jump-starting procedure
(Ypage 326).
If, at low temperatures, the indicator lamps/
warning lamps in the instrumentcluster do
not light up, it is highly likely that the
discharged battery has frozen.Inthis case,
you may neither charge the battery nor jump-
start the vehicle. The service life ofathawed-
out battery may be shorter. The starting
characteristics may be impaired, especiallyat
low temperatures. Have the thawed-out
battery checked ataqualified specialist
workshop.
Never chargeabattery still installed in the
vehicle unlessabattery charger unit
approved by Mercedes-Benzisbeing used. A
battery charger unit speciallyadapted for
Mercedes-Benz vehicles and tested and
approved by Mercedes-Benz is available as an
accessory. It permits the charging of the
battery in its installed position. Contact an
authorized Mercedes-Benz Center for further
information and availability. Read the battery
charger's operating instructions before
charging the battery.
Battery (vehicle)325
Breakdown assistance
Z

XFirst, remove the jumper cablesfrom earth pointand negative terminal!,then from
positiveclampand positiveterminal$.Begineachtime at the contacts on your own
vehicle first.
XClose coverof positiveclampafterremoving the jumper cables.
XHave the battery checkedataqualified specialist workshop.
iJump-startingisnot considered to beanormal operatingcondition.
iJumper cables and further information regardingjump-starting can be obtained at any
qualified specialist workshop.
Towing and tow-starting
Importantsafetynotes
GWARNING
Functionsrelevant to safety are restricted or
no longer available if:
Rthe engineisnot running.
Rthe brake system or the power steering is
malfunctioning.
Rthereisamalfunction in the voltage supply
or the vehicle's electrical system.
If your vehicle is being towed, much more
forcemay be necessary to steer or brake.
There isarisk of an accident.
In such cases, useatow bar. Beforetowing,
make sure that the steering moves freely.
GWARNING
If the weight of the vehicle to be towed or tow-
started is greater than the permissible gross
weight of your vehicle:
Rthe towingeye could detach itself
Rthe vehicle/trailer combination could
rollover.
There isarisk of an accident.
When towingortow-starting another vehicle,
its weight should not be greater than the
permissible gross weight of your vehicle.
Information on your vehicle's gross vehicle
weight ratingcan be found on the vehicle
identification plate (Ypage 372).
!If DISTRONIC PLUS or the HOLD function
is activated, the vehicle brakes
automatically in certain situations. To
preventdamage to thevehicle,deactivate
DISTRONICPLUS and the HOLD function in
the following or other similar situations:
Rwhen towing the vehicle
Rin the car wash
!Only secure the tow rope or tow bar at the
towing eyes. Otherwise,the vehicle could
be damaged.
!Do not use the towing eye for recovery,
this could damage the vehicle.Ifindoubt,
recover the vehicle withacrane.
!When towing, pullawayslowly and
smoothly.Ifthe tractive power is too high,
the vehicles could be damaged.
!Do not tow with sling-type equipment.
This could damage the vehicle.
!When towing vehicles with KEYLESS-GO,
use the key instead of the Start/Stop
button. Otherwise, the automatic
transmission may shift to positionPwhen
the driver's or front-passenger door are
opened, which could lead to damage to the
transmission.
!The vehicle can be towedamaximum of
30 miles (50km). The towing speed of
30 mph (50 km/h) must not be exceeded.
If the vehicle has to be towed more than
30 miles(50km), the entire vehicle must be
raised and transported.
328Towing and tow-starting
Breakdown assistance

The fuses are located in various fuse boxes:
RFuse box in the engine compartment on the
left-hand side of the vehicle, when viewed
in the direction of travel
Rfuse box in the trunk on the right-hand side,
when viewed in the direction of travel
the fuse allocation chart is located in the
vehicle tool kit in the stowage compartment
under the trunk floor (Ypage 320).
Fuse box in the engine compartment
GWARNING
When the hood is open and the windshield
wipers are set in motion,you can be injured
by the wiper linkage. There isarisk of injury.
Always switch off the windshield wipers and
the ignition before opening the hood.
!Make sure that no moisture can enter the
fuse box when the cover is open.
!When closing the cover, make sure that it
is lying correctly on the fuse box. Moisture
seeping in or dirt could otherwise impair
the operation of the fuses.
XMake sure that the windshield wipers are
turned off.
XOpen the hood.
XUseadry cloth to remove any moisture
from the fuse box.
XTo open:remove linesfrom the guides.
XMove linesaside. Route the lines behind
connection$to do this.
XOpen clamp.
XRemove the fuse box cover forwards.
XTo close:check whether the rubber seal is
lying correctly in the cover.
XInsert the cover at the rear of the fuse box
into the retainer.
XFold down cover and close clamps.
XSecure linesin the guides.
XClose the hood.
Fuse box in the trunk
!Make sure that no moisture can enter the
fuse box when the cover is open.
!When closing the cover, make sure that it
is lying correctly on the fuse box. Moisture
seeping in or dirt could otherwise impair
the operation of the fuses.
XOpen the trunk lid.
XTo open:release coverat the top right
and left-hand sides withaflat object.
XOpen coverdownwards in the direction
of the arrow.
332Fuses
Breakdown assistance

Only use brake fluid approved by Mercedes-
Benz according to MB Approval 331.0.
Information aboutapproved brake fluid can
be obtainedatany qualified specialist
workshop or on the Internet at
http://bevo.mercedes-benz.com.
iHave the brake fluid regularly replaced at
aqualified specialist workshop and the
replacementconfirmed in the Maintenance
Booklet.
Coolant
Important safety notes
GWARNING
If antifreezecomes into contact with hot
components in the engine compartment, it
may ignite. There isarisk of fire and injury.
Let the engine cool down before you add
antifreeze. Make sure that antifreezeisnot
spilled next to the filler neck.Thoroughly
clean the antifreeze from components before
startingthe engine.
!Only add coolant that has been premixed
with the desired antifreezeprotection. You
couldotherwise damage the engine.
Further information on coolants can be
found in the Mercedes-Benz Specifications
for Service Products, MB Specifications for
Service Products 310.1, e.g. on the
Internet at
http://bevo.mercedes-benz.com.Or
contactaqualified specialist workshop.
!Always useasuitable coolant mixture,
even in countries where high temperatures
prevail.
Otherwise, the engine cooling system is not
sufficiently protected from corrosionand
overheating.
Comply with the important safety precautions
for service products when handling coolant
(Ypage373).
The coolant isamixture of water and
antifreeze/corrosion inhibitor. It performs
the following tasks:
Rcorrosionprotection
Rantifreeze protection
Rraising the boiling point
If the coolant has antifreeze protection down
to -35‡(-37†),the boiling point of the
coolant during operationisapproximately
266‡(130 †).
The antifreeze/corrosion inhibitor
concentration in the engine cooling system
should:
Rbe at least 50%. This will protect the engine
cooling system against freezing down to
approximately -35‡(-37 †).
Rnot exceed 55% (antifreeze protection
down to -49‡[-45 †]). Otherwise, heat
will not be dissipated as effectively.
If the vehicle has lost coolant, add equal
amounts of water and antifreeze/corrosion
inhibitor.
Mercedes-Benz recommends an antifreeze/
corrosion inhibitor concentrate in
accordance with MB Specifications for
Service Products 310.1.
The coolant is checked with every
maintenance interval ataqualified specialist
workshop.
iWhen the vehicle is first delivered, it is
filled withacoolant mixture that ensures
adequate antifreeze and corrosion
protection.
Filling capacities
ModelCapacity
All models (except
for AMG vehicles)
Approx. 13.0 US qt
(12.3 l)
All models (AMG
vehicles)
Approx. 11.5 US qt
(10.9 l)
iUse MB 325.0 or MB 326.0 corrosion
inhibitor/antifreeze.
Service products and filling capacities377
Technical data
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