ECU MERCEDES-BENZ CLA 2014 Repair Manual

Towing the vehicle with the front axle
raised
Only vehicles without 4MATIC can be
towed with the front axle raised.
!Vehicles with 4MATIC must not be towed
with either the front or the rearaxle raised,
as doing so will damage the transmission.
Vehicles with 4MATIC may either be towed
away with both axles on the ground or be
loaded up and transported.
!The ignition must be switched off if the
vehicle is being towed with the front axle
raised.Otherwise, ESP®may intervene and
damage the brake system.
XTurn the SmartKey to position2in the
ignition lock.
XWhen the vehicle is stationary, depress the
brake pedal and keep it depressed.
XShift the automatic transmission to
positionP.
XRelease the brake pedal.
XRelease the electric parking brake.
XSwitch off the automatic locking
(Ypage 208).
XSwitch on the hazard warning lamps
(Ypage 107).
XTurn the SmartKey to position0in the
ignition lock and leave the SmartKey in the
ignition lock.
Observe the important safety notes when
towing your vehicle with the front axle raised
(Ypage 305).
Towingavehicle with both axles on
the ground
iIn orderto signal a change of direction
when towing with the hazard warning lamps
switched on, use the combination switch as
usual.Inthis case, only the indicator lamps
for the direction of travel flash. After
resetting the combination switch, the
hazard warning lamp starts flashing again.
The automatic transmission automatically
shifts to positionPwhen you open the driver's
or front-passenger door or when you remove
the SmartKey from the ignition lock. In order
to ensure that the automatic transmission
stays in positionNwhen towing the vehicle,
you must observe the following points:
XMake sure that the vehicle is stationary.
XTurn the SmartKey to position2in the
ignition lock.
XDepress and hold the brake pedal.
XShift the automatic transmission to
positionN.
XLeave the SmartKey in position2in the
ignition lock.
XRelease the brake pedal.
XRelease the electric parking brake.
XSwitch on the hazard warning lamps
(Ypage 107).
It is important that you observe the safety
instructions when towing away your vehicle
(Ypage 305).
Transporting the vehicle
!You may only secure the vehicle by the
wheels, not by parts of the vehicle such as
axle or steering components. Otherwise,
the vehicle could be damaged.
XTurn the SmartKey to position2in the
ignition lock.
XShift the transmission to positionN.
As soon as the vehicle has been loaded:
XPrevent the vehicle from rolling away by
applying the electric parking brake.
XShift the transmission to positionP.
XTurn the SmartKey to position0in the
ignition lock and remove it.
XSecure the vehicle.
The towing eye can be used to pull the vehicle
onto a trailer or transporter for transporting
purposes.
Towing and tow-starting307
Breakdown assistance
Z

Notes on 4MATIC vehicles
!Vehicles with 4MATIC must not be towed
with eitherthe front or the rear axle raised,
as doing so will damage the transmission.
Vehicles with 4MATIC may only either be
towed away with both axles on the ground or
be loaded up and transported.
If the vehicle's transmission, front, or rear
axle is damaged, have the vehicle transported
on a truck or trailer.
In the event of damage to the electrical
system
If the battery is defective, the automatic
transmission will be locked in positionP. To
shift the automatic transmission to position
N, you must provide power to the vehicle's
electrical system in the same way as when
jump-starting (Ypage 303).
Have the vehicle transported on a transporter
or trailer.
Tow-starting (emergency engine
starting)
!Vehicles with automatic transmission
must not be tow-started. You could
otherwise damage the automatic
transmission.
When tow-starting, it is important that you
observe the safety instructions (Ypage 305).
Fuses
Important safety notes
GWARNING
If you manipulate or bridge a faulty fuse or if
you replace it with a fuse with a higher
amperage, the electric cables could be
overloaded. This could result in a fire. There
is a risk of an accident and injury.
Always replace faulty fuses with the specified
new fuses having the correct amperage.
!Only use fuses that have been approved
for Mercedes-Benzvehicles and which
have the correct fuse rating for the system
concerned. Only use fuses marked with an
"S". Otherwise, components or systems
could be damaged.
The fuses in your vehicle serve to close down
faulty circuits. Ifafuse blows, all the
components on the circuit and their functions
stop operating.
Blown fuses must be replacedwith fuses of
the same rating, which you can recognize by
the color and value. The fuse ratings are listed
in the fuse allocation chart.
If a newly inserted fuse also blows, have the
cause traced and rectified at a qualified
specialist workshop, e.g. an authorized
Mercedes-BenzCenter.
Before changing a fuse
XSecure the vehicle against rolling away
(Ypage 153).
XSwitch off all electrical consumers.
XTurn the SmartKey to position0in the
ignition lock and remove it (Ypage 137).
All indicator lamps in the instrument cluster
must be off.
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 front-passenger footwell
The fuse allocation chart is on the fuse box in
the front-passenger footwell (Ypage 309).
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 is a risk of injury.
Always switch off the windshield wipers and
the ignition before opening the hood.
308Fuses
Breakdown assistance

Information on air pressure for the tires on
yourvehicle can be found:
Ron the vehicle's Tire and Loading
Information placard on the B-pillar
Ron the tire pressure label on the fuel filler
flap
Rin the "Tire pressure information" section
Checking tire pressures manually
To determine and set the correct tire
pressure, proceed as follows:
XRemove the valve cap of the tire that is to
be checked.
XPress the tire pressure gauge securely onto
the valve.
XRead the tire pressure and compare it with
the recommended value on the Tire and
Loading Information placard on the
B-pillar on the driver's side of your vehicle.
XIf necessary, increase the tire pressure to
the recommended value (Ypage 316).
XIf the tire pressure is too high, release air
by pressing down the metal pin in the valve
using the tip of a pen, for example. Then,
checkthe tire pressure again using the tire
pressure gauge.
XScrew the valve cap onto the valve.
XRepeatthese steps for the other tires.
Tire pressure loss warning system
(Canada only)
General notes
While the vehicle is in motion, the tire
pressure loss warning system monitors the
set tire pressure using the rotational speed of
the wheels. This enables the system to detect
significant pressure loss in a tire. If the speed
of rotation of a wheel changes as a result of
a loss of pressure, a corresponding warning
message will appearinthe multifunction
display.
You can recognize the tire pressure loss
warning by theRun Flat Indicator
Active Press 'OK' to Restartmessage
which appears in theServicemenu of the
multifunction display. Further information on
the message display can be found under
"Restarting the tire pressure loss warning
system" (Ypage 319).
Important safety notes
The tire pressure warning system does not
warn you of an incorrectly set tire pressure.
Observe the notes on the recommended tire
pressure (Ypage 316).
The tire pressure loss warning does not
replace the need to regularly check the tire
pressure. An even loss of pressure on several
tires at the same time cannot be detected by
the tire pressure loss warning system.
The tire pressure monitor is not able to warn
you of a sudden loss of pressure, e.g. if the
tire is penetrated by a foreign object. In the
event of a sudden loss of pressure, bring the
vehicle to a halt by braking carefully. Avoid
abrupt steering maneuvers.
The function of the tire pressure loss warning
system is limited or delayed if:
Rsnow chains are mounted on your vehicle's
tires.
Rroad conditions are wintry.
Ryou are driving on sand or gravel.
Ryou adopt a very sporty driving style
(cornering at high speeds or driving with
high rates of acceleration).
Ryou are driving with a heavy load (in the
vehicle or on the roof).
Restarting the tire pressure loss
warning system
Restart the tire pressure loss warning system
if you have:
Rchanged the tire pressure
Rchanged the wheels or tires
Rmounted new wheels or tires
Tire pressure319
Wheels and tires
Z

Aspect ratio
Relationship between tire height and tire
width in percent.
Tire pressure
This is pressure inside the tire applying an
outward force to each square inch of the tire's
surface. The tire pressure is specified in
pounds per square inch (psi), in kilopascal
(kPa) or in bar. The tire pressure should only
be corrected when the tires are cold.
Tire pressure of cold tires
The tires are cold:
Rif the vehicle has been parked without
direct sunlightonthe tires for at least three
hours and
Rif the vehicle has not been driven further
than 1 mile (1.6 km)
Tread
The part of the tire that comes into contact
with the road.
Bead
The tire bead ensures that the tire sits
securely on the wheel. There are several steel
wires in the bead to prevent the tire from
coming loose from the wheel rim.
Sidewall
The part of the tire between the tread and the
bead.
Weight of optional extras
The combined weight of those optional extras
that weigh more than the replaced standard
part and more than 2.3 kg (5 lbs). These
optional extras, such as high-performance
brakes, level control, a roof rack or a high-
performance battery, are not included in the
curb weight and the weight of the
accessories.
TIN (Tire Identification Number)
This is a unique identifier which can be used
by a tire manufacturer to identify tires, for
example for a product recall, and thus identify
the purchasers. The TIN is made up of the
manufacturer's identity code, tire size, tire
type code and the manufacturing date.
Load bearing index
The load bearing index (also load index) is a
code that contains the maximum load bearing
capacity of a tire.
Traction
Traction is the result of friction between the
tires and the road surface.
Treadwear indicators
Narrow bars (tread wear bars) that are
distributed over the tire tread. If the tire tread
is level with the bars, the wear limit ofin
(1.6 mm) has been reached.
Occupant distribution
The distribution of occupants in a vehicle at
their designated seating positions.
Total load limit
Nominal load and luggage load plus
68 kilograms (150 lb) multiplied by the
number of seats in the vehicle.
Definition of terms for tires and loading335
Wheels and tires
Z

XBring the front wheels into the straight-
ahead position.
XMove the DIRECT SELECT lever to position
P.
XSwitch off the engine.
XRemove the SmartKey from the ignition
lock.
XIf included in the vehicle equipment,
remove the tire-change tool kit from the
vehicle.
XSecure the vehicle to prevent it from rolling
away.
Securing the vehicle to prevent it from
rolling away
If your vehicle is equipped with a wheel chock,
it can be found in the tire-change tool kit
(Ypage 294).
The folding wheel chock is an additional
safety measure to prevent the vehicle from
rolling away, for example whenchanging a
wheel.
XFold both plates upwards.
XFold out lower plate.
XGuide the lugs on the lower plate fully into
the openings in base plate".
Securing the vehicle on level ground
XOn level ground:place chocks or other
suitable items under the front and rear of
the wheel that is diagonally opposite the
wheel you wish to change.
Securing the vehicle on slight downhill gradients
XOn light downhill gradients:place
chocks or other suitable items in front of
the wheels of the front and rear axle.
Raising the vehicle
GWARNING
If you do not position the jack correctly at the
appropriate jacking point of the vehicle, the
jack could tip over with the vehicle raised.
There is a risk of injury.
Only position the jack at the appropriate
jacking point of the vehicle. The base of the
jack must be positioned vertically, directly
under the jacking point of the vehicle.
Changingawheel337
Wheels and tires
Z

Observe the following when raising the
vehicle:
Rto raise the vehicle, only use the vehicle-
specific jack that has been tested and
approved by Mercedes-Benz.Ifused
incorrectly, the jack could tip over with the
vehicle raised.
Rthe jack is designed only to raise and hold
the vehicle for a short time while a wheel
is being changed. It is not suited for
performing maintenance work under the
vehicle.
Ravoid changing the wheel on uphill and
downhill slopes.
Rbefore raising the vehicle, secure it from
rolling away by applying the parking brake
and inserting wheel chocks. Never
disengage the parking brake while the
vehicle is raised.
Rthe jack must be placed on a firm, flat and
non-slip surface. On a loose surface, a
large, load-bearing underlay must be used.
On a slippery surface, a non-slip underlay
must be used, e.g. rubber mats.
Rdo not use wooden blocks or similar
objects as a jack underlay.Otherwise, the
jack will not be able to achieve its load-
bearing capacity due to the restricted
height.
Rmake sure thatthe distance between the
underside of the tires and the ground does
not exceed 1.2 in (3 cm).
Rnever place your hands and feet under the
raised vehicle.
Rnever lie under the raised vehicle.
Rnever start the engine when the vehicle is
raised.
Rnever open or close a door or the tailgate
when the vehicle is raised.
Rmake sure that no persons are present in
the vehicle when the vehicle is raised.
!The jack is designed exclusively for
jacking up the vehicle at the jacking points.
Otherwise, your vehicle could be damaged.
Steel wheel with wheel trim
XVehicles with steel wheels:carefully
reach into two of the wheel trim openings
and remove the wheel trim.
XUsing lug wrench, loosen the bolts on
the wheel you wish to change by about one
full turn. Do not unscrew the bolts
completely.
The jacking points are located just behind the
wheel housings of the front wheels and just
in front of the wheel housings of the rear
wheels (arrows).
338Changingawheel
Wheels and tires

!To prevent damage to the paintwork, hold
the wheel securely against the wheel hub
while screwing in the first wheel bolt.
XCleanthe wheel and wheel hub contact
surfaces.
XPlace the new wheel on the wheel hub and
push it on.
XTighten the wheel bolts until they are
finger-tight.
Lowering the vehicle
GWARNING
The wheels could work loose if the wheel nuts
and bolts are not tightened to the specified
tightening torque. There is a risk of accident.
Have the tightening torque immediately
checked at a qualified specialist workshop
after a wheel is changed.
XPlace the ratchet wrench onto the hexagon
nut of the jack so that the lettersABare
visible.
XTurn the ratchet wrench until the vehicle is
once again standing firmly on the ground.
XPlace the jack to one side.
XTighten the wheel bolts evenly in a
crosswise pattern in the sequence
indicated (to). The tightening torque
must be96 lb-ft (130 Nm).
XTurn the jack back to its initial position.
XStow the jack and the rest of the vehicle
tools in the vehicle again.
XCheck the tire pressure of the newly
mounted wheel and adjust it if necessary.
Observe the recommended tire pressure
(Ypage 316).
iVehicles with tire pressure monitor: all
wheels mounted must be equipped with
functioning sensors.
Wheel and tire combinations
General notes
!For safety reasons, Mercedes-Benz
recommends that you only use tires and
wheels which have been approved by
Mercedes-Benzspecifically for your
vehicle.
These tires have been specially adapted for
use with the control systems, such as ABS
or ESP®, and are marked as follows:
RMO=Mercedes-BenzOriginal
RMOE=Mercedes-BenzOriginal Extended
(tires featuring run-flat characteristics)
RMO1=Mercedes-BenzOriginal (only
certain AMG tires)
Mercedes-Benz Original Extended tires
may only be used on wheels that have been
specifically approved by Mercedes-Benz.
Only use tires, wheels or accessories
tested and approved by Mercedes-Benz.
Certain characteristics, e.g. handling,
340Wheel and tire combinations
Wheels and tires