engine MERCEDES-BENZ SL-CLASS ROADSTER 2014 Workshop Manual

Problems with fuel and the fuel tank
This section provides descriptions of and solutions to safety-relevant problems. Descriptions
of and solutions to further problems can be found in the Digital Operator's Manual. Problem Possible causes/consequences and
M
MSolutions Fuel is leaking from the
vehicle. The fuel line or the fuel tank is faulty.
G WARNING
Risk of explosion or fire.
X Turn the SmartKey to position 0in the ignition lock and remove
it immediately (Y page 121).
X Do not restart the engine under any circumstances.
X Consult a qualified specialist workshop. Parking
Important safety notes
G
WARNING
Flammable material such as leaves, grass or
twigs may ignite if they come into contact with
hot parts of the exhaust system or exhaust
gas flow. There is a risk of fire.
Park the vehicle so that no flammable
materials come into contact with parts of the
vehicle which are hot. Take particular care not
to park on dry grassland or harvested grain
fields. G
WARNING
If you switch off the ignition while driving,
safety-relevant functions are only available
with limitations, or not at all. This could affect,
for example, the power steering and the brake
boosting effect. You will require considerably
more effort to steer and brake. There is a risk
of an accident.
Do not switch off the ignition while driving. G
WARNING
If you leave children unsupervised in the
vehicle, they could set it in motion by, for
example:
R release the parking brake.
R shift the automatic transmission out of the
parking position P.
R start the engine.
In addition, they may operate vehicle
equipment and become trapped. There is a
risk of an accident and injury.
When leaving the vehicle, always take the
SmartKey with you and lock the vehicle. Never
leave children unsupervised in the vehicle.
! Always secure the vehicle correctly
against rolling away. Otherwise, the vehicle
or its drivetrain could be damaged.
Information on the electric parking brake can
be found in the Digital Operator's Manual.
To ensure that the vehicle is secured against
rolling away unintentionally:
R the electric parking brake must be applied.
R the transmission must be in position Pand
the SmartKey must be removed from the
ignition lock.
R on steep uphill or downhill gradients, turn
the front wheels towards the curb. 130
ParkingDriving and parking

Switching off the engine
Important safety notes G
WARNING
The automatic transmission switches to
neutral position Nwhen you switch off the
engine. The vehicle may roll away. There is a
risk of an accident.
After switching off the engine, always switch
to parking position P. Prevent the parked
vehicle from rolling away by applying the
parking brake.
Information in the Digital Operator's
Manual A description of how to switch off the engine
on vehicles with manual or automatic
transmission can be found in the Digital
Operator's Manual.
Parking the vehicle for a long period
You can find information about this in the
Digital Operator's Manual. Driving tips
Information in the Digital Operator's
Manual
In the Digital Operator's Manual you will find
information on the following topics:
R General driving tips
R ECO display R
Braking
-Important safety notes
- Driving/braking on downhill gradients
- Heavy and light loads
- Driving/braking on wet road surfaces
- Limited braking performance on salt-
treated roads
- High performance and ceramic brake
system for AMG vehicles
- Servicing the brakes
R Driving on wet roads
R Winter driving
-Important safety notes
- Driving with summer tires
- Slippery road surfaces Checking brake lining thickness
You can measure the break pad/lining
thickness using a test gauge. Color-coding
(green or red) on the test gauge allows you to
determine whether the brake pad/lining
thickness is still sufficient. The test gauge is
in the vehicle document wallet in the glove
box. Driving tips
131Driving and parking Z

Front wheel
Rear wheel
X
Bring the vehicle and wheels into a suitable
position so that you can attach test gauge
A.
X Secure the vehicle against rolling away
(Y page 130).
X Move the selector lever to position P.
X Switch off the engine.
X Place test gauge Abetween the wheel's
spokes on brake pad/lining =.X
Hold test gauge Avertically on brake
disc :and slide measuring pin ;onto
brake disc :.
X Check which color field ?the arrow on
measuring pin ;is pointing to.
Green: the brake pad/lining thickness is
sufficient.
Red: the brake pad/lining thickness is not
sufficient. Have the brake pads/lining
checked at a qualified specialist workshop.
i To avoid an inaccurate measurement:
R make sure you position the wheels
suitably
R do not put the measuring pin on a recess
in the brake disc Driving systems
Cruise control
General notes Cruise control maintains a constant road
speed for you. It brakes automatically in order
to avoid exceeding the set speed. On long and
steep downhill gradients, especially if the
vehicle is laden, you must select a lower gear
in good time. By doing so, you will make use
of the braking effect of the engine. This
relieves the load on the brake system and
prevents the brakes from overheating and
wearing too quickly.
Use cruise control only if road and traffic
conditions make it appropriate to maintain a
steady speed for a prolonged period. You can
store any road speed above 20 mph
(30 km/h).
Important safety notes If you fail to adapt your driving style, cruise
control can neither reduce the risk of an
accident nor override the laws of physics.
Cruise control cannot take into account the
road, traffic and weather conditions. Cruise
control is only an aid. You are responsible for 132
Driving systemsDriving and parking

the distance to the vehicle in front, for vehicle
speed, for braking in good time and for
staying in lane.
Do not use cruise control:
R in road and traffic conditions which do not
allow you to maintain a constant speed e.g.
in heavy traffic or on winding roads
R on slippery road surfaces. Braking or
accelerating could cause the drive wheels
to lose traction and the vehicle could then
skid
R when there is poor visibility, e.g. due to fog,
heavy rain or snow
If there is a change of drivers, advise the new
driver of the speed stored. G
WARNING
If you call up the stored speed and it differs
from the current speed, the vehicle
accelerates or decelerates. If you do not know
the stored speed, the vehicle could accelerate
or brake unexpectedly. There is a risk of an
accident.
Pay attention to the road and traffic
conditions before calling up the stored speed.
If you do not know the stored speed, store the
desired speed again.
Cruise control lever Cruise control lever
:
To store the current speed or a higher
speed
; To store the current speed or calling up
the last stored speed =
To store the current speed or a lower
speed
? To deactivate cruise control
When you activate cruise control, the stored
speed is shown in the status indicator of the
multifunction display:
R USA only: e.g. CRUISE 55 Miles
CRUISE 55 Miles
R Canada only: e.g. ¯90 Km/h90 Km/h
Information in the Digital Operator's
Manual In the Digital Operator's Manual you will find
information on the following topics:
R
Storing, maintaining and calling up a speed
R Setting a speed
R Deactivating cruise control DISTRONIC PLUS
General notes DISTRONIC PLUS regulates the speed and
automatically helps you maintain the
distance to the vehicle detected in front.
DISTRONIC PLUS brakes automatically so
that the set speed is not exceeded.
On long and steep downhill gradients,
especially if the vehicle is laden, you must
select a lower gear in good time. By doing so,
you will make use of the braking effect of the
engine. This relieves the load on the brake
system and prevents the brakes from
overheating and wearing too quickly.
If a slower-moving vehicle is detected in front,
DISTRONIC PLUS brakes your vehicle. It
maintains the preset distance to the vehicle
in front.
If DISTRONIC PLUS detects that there is a risk
of a collision, you will be warned visually and
acoustically. DISTRONIC PLUS cannot
prevent a collision without your intervention.
An intermittent warning tone will then sound
and the distance warning lamp will light up in
the instrument cluster. Brake immediately in Driving systems
133Driving and parking Z

Activating DISTRONIC PLUS; storing,
maintaining and calling up a speed Important safety notes
!
If DISTRONIC PLUS or the HOLD function
is activated, the vehicle brakes
automatically in certain situations. To
prevent damage to the vehicle, deactivate
DISTRONIC PLUS and the HOLD function in
the following or other similar situations:
R when towing the vehicle
R in the car wash
In order to activate DISTRONIC PLUS, the
following conditions must be fulfilled:
R the engine must be started. It may take up
to two minutes after pulling away before
DISTRONIC PLUS is operational.
R your vehicle must not be secured by the
electric parking brake.
R ESP ®
must be activated.
R the transmission must be in position D.
R the hood must be closed.
R the driver's door must be closed when you
shift from Pto Dor your seat belt must be
fastened.
R the front-passenger door must be closed.
R the vehicle must not skid.
Arming
X Briefly pull the cruise control lever toward
you =, up :or down ?.
DISTRONIC PLUS is selected.
X To adjust the set speed in 1 mph
increments (1 km/h increments): briefly
press the cruise control lever up :to the
pressure point for a higher speed or
down ?for a lower speed.
Every time the cruise control lever is
pressed up or down, the last speed stored
is increased or reduced.
or
X To adjust the set speed in 5 mph
increments (10 km/h increments):
briefly press the cruise control lever up
: past the pressure point for a higher
speed or down ?for a lower speed.
Every time the cruise control lever is
pressed up or down, the last speed stored
is increased or reduced.
X Remove your foot from the accelerator
pedal.
Your vehicle adapts its speed to that of the
vehicle in front, but only up to the desired
stored speed.
When driving at speeds below 20 mph
(30 km/h), you can only activate DISTRONIC
PLUS if the vehicle in front has been detected
and is shown in the multifunction display. If
the vehicle in front is no longer detected and
displayed, for example because it has
changed lanes, DISTRONIC PLUS is
deactivated. You will hear a warning tone if
this is the case.
i If you do not fully release the accelerator
pedal, the DISTRONIC PLUS Inactive
DISTRONIC PLUS Inactive
message appears in the multifunction
display. The set distance to a slower-
moving vehicle in front will then not be
maintained. You will be driving at the speed
you determine by the position of the
accelerator pedal.
Pulling away and driving
If you depress the brake, DISTRONIC PLUS is
deactivated unless your vehicle is stationary.
X If the vehicle in front pulls away: remove
your foot from the brake pedal.
X Briefly pull the cruise control lever towards
you =or press it up :or down ?.
or
X Accelerate briefly.
Your vehicle pulls away and adapts its
speed to that of the vehicle in front.
If there is no vehicle in front, DISTRONIC
PLUS operates in the same way as cruise
control.
If DISTRONIC PLUS detects that the vehicle
in front has slowed down, it brakes your 136
Driving systemsDriving and pa
rking

vehicle. It maintains the preset distance to
the vehicle in front.
If DISTRONIC PLUS detects that there is a risk
of a collision, you will be warned visually and
acoustically. DISTRONIC PLUS cannot
prevent a collision without your intervention.
An intermittent warning tone will then sound
and the distance warning lamp will light up in
the instrument cluster. Brake immediately in
order to increase the distance from the
vehicle in front, or take evasive action,
provided it is safe to do so.
If DISTRONIC PLUS detects a faster-moving
vehicle in front, it increases the driving speed.
However, the vehicle is only accelerated up
to the speed you have stored.
Changing lanes
If you wish to change to the passing lane (in
countries where traffic drives on the right, the
passing lane is the left-hand lane),
DISTRONIC PLUS supports you if:
R you are driving faster than 40 mph
(60 km/h)
R DISTRONIC PLUS is maintaining the
distance to a vehicle in front
R you have switched on the corresponding
turn signal
R DISTRONIC PLUS does not detect a danger
of collision
If these conditions are fulfilled, your vehicle
is accelerated. Acceleration will be
interrupted if changing lanes takes too long
or if the distance between your vehicle and
the vehicle in front becomes too small.
Stopping G
WARNING
When leaving the vehicle, even if it is braked
only by DISTRONIC PLUS, it could roll away if:
R there is a malfunction in the system or in
the voltage supply.
R DISTRONIC PLUS has been deactivated
with the cruise control lever, e.g. by a vehicle occupant or from outside the
vehicle.
R the electrical system in the engine
compartment, the battery or the fuses have
been tampered with.
R the battery is disconnected.
R the accelerator pedal has been depressed,
e.g. by a vehicle occupant.
There is a risk of an accident.
If you wish to exit the vehicle, always turn off
DISTRONIC PLUS and secure the vehicle
against rolling away.
Deactivating DISTRONIC PLUS
(Y page 138).
If DISTRONIC PLUS detects that the vehicle
in front is stopping, it brakes your vehicle until
it is stationary.
Once your vehicle is stationary, it remains
stationary and you do not need to depress the
brake. After a time, the electric parking brake
secures the vehicle and relieves the service
brake.
Depending on the specified minimum
distance, your vehicle will come to a standstill
at a sufficient distance behind the vehicle in
front. The specified minimum distance is set
using the control on the cruise control lever.
The electric parking brake automatically
secures the vehicle if DISTRONIC PLUS is
activated and:
R the driver's door is open and the driver's
seat belt is unfastened.
R the engine is switched off, unless it is
automatically switched off by the ECO
start/stop function.
R a system malfunction occurs.
R the power supply is not sufficient.
If a malfunction occurs, then the transmission
may also be shifted into position P
automatically. Driving systems
137Driving and parking Z

Storing the current speed or calling up the
last stored speed G
WARNING
If you call up the stored speed and it differs
from the current speed, the vehicle
accelerates or decelerates. If you do not know
the stored speed, the vehicle could accelerate
or brake unexpectedly. There is a risk of an
accident.
Pay attention to the road and traffic
conditions before calling up the stored speed.
If you do not know the stored speed, store the
desired speed again.
X Briefly pull the cruise control lever toward
you =.
X Remove your foot from the accelerator
pedal.
DISTRONIC PLUS is activated. The first
time it is activated, the current speed is
stored. Otherwise, it sets the vehicle cruise
speed to the previously stored value.
Information in the Digital Operator's
Manual In the Digital Operator's Manual you will find
information on the following topics:
R
Setting a speed
R Setting the specified minimum distance
R DISTRONIC PLUS displays in the
instrument cluster
Deactivating DISTRONIC PLUS G
WARNING
DISTRONIC PLUS is deactivated and releases
the brakes if the vehicle is slowed down to a
speed below 20 mph (30km/h) by the system,
provided that DISTRONIC PLUS does not
detect a vehicle directly in front. At this point,
the driver must apply the brakes in order to
slow down further and bring the vehicle to a
standstill. Cruise control lever
There are several ways to deactivate
DISTRONIC PLUS:
X
Briefly press the cruise control lever
forwards :.
or
X Brake, unless the vehicle is stationary.
When you deactivate DISTRONIC PLUS, you
will see the DISTRONIC PLUS Off DISTRONIC PLUS Off message
in the multifunction display for approximately
five seconds.
i The last speed stored remains stored until
you switch off the engine.
i DISTRONIC PLUS is not deactivated if you
depress the accelerator pedal. If you
accelerate to overtake, DISTRONIC PLUS
adjusts the vehicle's speed to the last
speed stored after you have finished
overtaking.
DISTRONIC PLUS is automatically
deactivated if:
R you engage the electric parking brake or if
the vehicle is automatically secured with
the electric parking brake
R you are driving slower than 15 mph
(25 km/h) and there is no vehicle in front,
or if the vehicle in front is no longer
detected
R ESP ®
intervenes or you deactivate ESP ®
R the transmission is in the P,Ror Nposition 138
Driving systemsDriving and parking

Obstructions and stationary vehicles
DISTRONIC PLUS does not brake for
obstacles or stationary vehicles. If, for
example, the detected vehicle turns a corner
and reveals an obstacle or stationary vehicle,
DISTRONIC PLUS will not brake for these.
Crossing vehicles DISTRONIC PLUS may mistakenly detect
vehicles that are crossing your lane.
Activating DISTRONIC PLUS at traffic lights
with crossing traffic, for example, could cause
your vehicle to pull away unintentionally. HOLD function
General notes The HOLD function can assist the driver in the
following situations:
R when pulling away, especially on steep
slopes
R when maneuvering on steep slopes
R when waiting in traffic The vehicle is kept stationary without the
driver having to depress the brake pedal.
The braking effect is canceled and the HOLD
function deactivated when you depress the
accelerator pedal to pull away.
Important safety notes
G
WARNING
When leaving the vehicle, it can still roll away
despite being braked by the HOLD function if:
R there is a malfunction in the system or in
the voltage supply.
R the HOLD function has been deactivated by
pressing the accelerator pedal or the brake
pedal, e.g. by a vehicle occupant.
R the electrical system in the engine
compartment, the battery or the fuses have
been tampered with.
R the battery is disconnected
There is a risk of an accident.
If you wish to exit the vehicle, always turn off
the HOLD function and secure the vehicle
against rolling away.
! If DISTRONIC PLUS or the HOLD function
is activated, the vehicle brakes
automatically in certain situations. To
prevent damage to the vehicle, deactivate
DISTRONIC PLUS and the HOLD function in
the following or other similar situations:
R when towing the vehicle
R in the car wash
Deactivating the HOLD function
(Y page 141).
Activation conditions You can activate the HOLD function if:
R
the vehicle is stationary
R the engine is running or if it has been
automatically switched off by the ECO
start/stop function
R the driver's door is closed or your seat belt
is fastened 140
Driving systemsDriving and parking

R
the electric parking brake is released
R the transmission is in position D,Ror N
R DISTRONIC PLUS is deactivated
Activating the HOLD function X
Make sure that the activation conditions
are met.
X Depress the brake pedal.
X Quickly depress the brake pedal further
until :HOLDHOLD appears in the multifunction
display.
The HOLD function is activated. You can
release the brake pedal.
i If depressing the brake pedal the first
time does not activate the HOLD function,
wait briefly and then try again.
Deactivating the HOLD function The HOLD function is deactivated
automatically if:
R
you accelerate and the transmission is in
position Dor R.
R you shift the transmission to position P.
R you apply the brakes again with a certain
amount of pressure until HOLD
HOLD disappears
from the multifunction display.
R you secure the vehicle using the electric
parking brake.
R you activate DISTRONIC PLUS.
i After a time, the electric parking brake
secures the vehicle and relieves the service
brake. The electric parking brake automatically
secures the vehicle if the HOLD function is
activated and:
R
the driver's door is open and the driver's
seat belt is unfastened.
R the engine is switched off, unless it is
automatically switched off by the ECO
start/stop function.
R a system malfunction occurs.
R the power supply is not sufficient.
If a malfunction occurs, then the transmission
may also be shifted into position P
automatically. RACE START
Important safety notes i
Observe the safety notes for the SPORT
handling mode (Y page 71).
RACE START is intended solely for activation
on dedicated race circuits.
RACE START enables optimal acceleration
from a standing start. The precondition for
this is a suitable high-grip road surface.
i RACE START is only available for the
SL 63 AMG model.
Information in the Digital Operator's
Manual In the Digital Operator's Manual you will find
information on the following topics:
R
Conditions for activation
R Activating RACE START Adaptive Damping System
You can find information about this in the
Digital Operator's Manual. Driving systems
141Driving and parking Z

Active Body Control (except AMG
vehicles)
Vehicle level General notes
In order to reduce fuel consumption and
improve the driving dynamics, the vehicle is
lowered as its speed increases. With the
SPORT suspension tuning, it is lowered by up
to 0.5 in (13 mm), with COMFORT by up to
0.2 in (5 mm). As the speed is reduced, the
vehicle is raised up to the set vehicle height.
Select the "Normal" setting for normal road
surfaces and "Raised" for driving with snow
chains or on particularly poor road surfaces.
Your selection remains stored even if you
remove the SmartKey from the ignition lock.
Important safety notes G
WARNING
The vehicle is slightly lowered if you:
R have selected the SPORT suspension
tuning at normal level and
R switch off the engine
Persons in the vicinity of the wheel arch or the
underbody may thus become trapped. There
is a risk of injury.
Make sure that nobody is in the vicinity of the
wheel arch or the underbody when you switch
off the engine. Setting raised level X
Make sure that the engine is running or that
it has been switched off by the ECO start/
stop function.
X Make sure that a speed of 75 mph
(120 km/h) is not exceeded.
X If indicator lamp ; ;is not lit: press
button :.
If the engine has been switched off by the
ECO start/stop function, it is now
restarted.
Indicator lamp ;lights up. The vehicle
height is adjusted to raised level.
Setting the normal level
X Make sure that the engine is running or that
it has been switched off by the ECO start/
stop function.
X If indicator lamp ; ;is lit: press
button :.
Indicator lamp ;goes out. The vehicle is
adjusted to normal level.
The "Raised level" setting is canceled if you:
R are driving faster than approximately
75 mph (120 km/h).
R drive for approximately three minutes at a
speed over 50 mph (80 km/h).
Suspension tuning You can find information about this in the
Digital Operator's Manual.142
Driving systemsDriving and pa
rking