engine MERCEDES-BENZ SLK-Class 2014 R172 Repair Manual

Problem Possible causes/consequences and
0050
0050Solutions The coolant
temperature display is
showing more than
248 ‡ (120 †). The
coolant warning lamp
may also be lit and a
warning tone may
sound. The coolant level is too low. The coolant is too hot and the engine
is no longer being cooled sufficiently.
X
Stop as soon as possible and allow the engine and the coolant
to cool down.
X Check the coolant level (Y page 277). Observe the warning
notes as you do so and add coolant if necessary. If the coolant level is correct, the engine radiator fan may be faulty.
The coolant is too hot and the engine is no longer being cooled
sufficiently.
X
At coolant temperatures below 248 ‡(120 †), drive to the next
qualified specialist workshop.
X Avoid heavy loads on the engine as you do so, e.g. driving in
mountainous terrain and stop-and-go traffic. Manual transmission
Gear lever
! Only engage gear when the clutch pedal
is depressed.
! When shifting between 5thand 6thgear,
you should always push the gear lever all
the way to the right. You could otherwise
shift unintentionally into 3rdor4th gear
and damage the transmission.
If you shift down at too high a speed
(transmission braking), this can cause the
engine to overrev, leading to engine
damage.
Never hold the vehicle stopped on a hill by
using the clutch pedal. There is otherwise
a risk of damaging the clutch. Gear lever
005E
Reverse gear
0047 to004C
Forward gears Engaging reverse gear
! Only shift into reverse gear Rwhen the
vehicle is stationary. Otherwise, you could
damage the transmission.
X Stop the vehicle.
X Depress the clutch pedal fully.
X Shift to neutral N.
X Move the gear lever firmly to the left
beyond the point of resistance and then
forwards. 148
Manual transmissionDriving and parking

i
The ECO start/stop function is not
available when reverse gear is engaged.
Further information on the ECO start/stop
function (Y page 143). Shift recommendation
X
Shift gear according to gearshift
recommendation 0043when shown in the
multifunction display of the instrument
cluster.
The gearshift recommendations assist you in
adopting an economical driving style. The
recommended gear is shown in the
multifunction display. Automatic transmission
Important safety notes
G
WARNING
If the engine speed is above the idling speed
and you engage transmission position Dor
R, the vehicle could pull away suddenly. There
is a risk of an accident.
When engaging transmission position Dor R,
always firmly depress the brake pedal and do
not simultaneously accelerate. 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. Selector lever
Overview of transmission positions Selector lever
005D
Park position with selector lever lock
005E Reverse gear
005C Neutral
005B Drive
Transmission position and drive
program display 0043
Transmission position display
0044 Drive program display
The current position of the selector lever is
shown by the indicators next to the selector
lever.
The indicators light up when the SmartKey is
inserted into the ignition lock. The indicators
go out when the SmartKey is removed from
the ignition lock. Automatic transmission
149Driving and parking Z

Transmission positions
0045
Park position
Do not shift the transmission into
position P(Ypage 149) unless the
vehicle is stationary. The parking
lock should not be used as a brake
when parking. Always apply the
electronic parking brake in
addition to the parking lock in order
to secure the vehicle.
The SmartKey can only be removed
if the transmission is in position P.
If the SmartKey is removed from
the ignition lock, the selector lever
is locked.
If the vehicle electronics are
malfunctioning, the selector lever
may be locked in position P. To
release a locked selector lever, see
"Manual override of parking lock"
(Y page 156). 0046
Reverse gear
Only shift the transmission to R
when the vehicle is stationary. 0044
Neutral
Do not shift the transmission to
N
while driving. Otherwise, the
automatic transmission could be
damaged.
No power is transmitted from the
engine to the drive wheels.
Releasing the brakes will allow you
to move the vehicle freely, e.g. to
push it or tow it.
If ESP ®
is deactivated or faulty:
only shift the transmission to
position Nif the vehicle is in danger
of skidding, e.g. on icy roads.
! Rolling in neutral Ncan damage
the drive train. 003A
Drive
The automatic transmission
changes gear automatically. All
forward gears are available.
Changing gear
The automatic transmission shifts to the
individual gears automatically when it is in
transmission position D. This automatic
gearshifting behavior is determined by:
R the selected drive program (Y page 151)
R the position of the accelerator pedal
R the road speed Driving tips
Accelerator pedal position Your style of driving influences how the
automatic transmission shifts gear:
R
little throttle: early upshifts
R more throttle: late upshifts 150
Automatic transmissionDriving an
d parking

Double-clutch function
When shifting down, the double-clutch
function is active regardless of the currently
selected drive program. The double-clutch
function reduces load change reactions and
is conducive to a sporty driving style. The
sound generated by the double-clutch
function depends on the drive program
selected.
Kickdown Use kickdown for maximum acceleration.
X Depress the accelerator pedal beyond the
pressure point.
The transmission shifts to a lower gear
depending on the engine speed.
X Ease off the accelerator pedal once the
desired speed is reached.
The automatic transmission shifts back up. Program selector button
General notes Example: program selector button
X
Press program selector button 0043
repeatedly until the letter for the desired
gearshift program appears in the
multifunction display.
The program selector button allows you to
choose between different driving
characteristics.
i Further information about permanent
drive program M(Y page 153). As well as this permanent drive program
M, you can also activate temporary drive
program
M(Ypage 152).
In AMG vehicles, drive program Eis called
drive program C. E
Economy
C Controlled
Efficiency Comfortable, economical
driving
S
Sport Sporty driving style
M
Manual Manual gear shifting
Only change from automatic drive program
E
or Sto manual drive program Mwhen the
vehicle is stationary.
i When the engine is started, the automatic
transmission always switches to automatic
drive program E(drive program Cin AMG
vehicles).
i AMG vehicles: when in drive program C
and with a small load demand, the engine
will automatically only operate with four
cylinders. This is the case in city traffic or
on a country road, for example. This
reduces fuel consumption. Cylinder shut-
off is inactive in drive programs Sand M,
so that the engine will operate with all eight
cylinders.
i For further information on the automatic
drive program, see (Y page 152). Automatic transmission
151Driving and parking Z

Steering wheel paddle shifters
0043
Left-hand steering wheel paddle shifter
0044 Right-hand steering wheel paddle shifter
In the manual drive program, you can change
gear using the steering wheel paddle shifters
or the selector lever (Y page 152).
Further information about permanent drive
program M(Y page 153).
Further information about temporary drive
program M(Y page 152).
i The full range of functions for the steering
wheel paddle shifters is available only once
operating temperature has been reached.
i You can only change gear with the
steering wheel paddle shifters when the
transmission is in position D.Automatic drive program
Automatic drive programs E and S Drive program
E(drive program Con MAG
vehicles) is characterized by the following:
R comfort-oriented engine and transmission
settings
R optimal fuel consumption resulting from
the automatic transmission shifting up
sooner
R the vehicle pulling away more gently in
forward and reverse gears, unless the
accelerator pedal is depressed fully R
increased sensitivity. This improves driving
stability on slippery road surfaces, for
example
R the automatic transmission shifting up
sooner. This results in the vehicle being
driven at lower engine speeds and the
wheels being less likely to spin
Drive program Sis characterized by the
following:
R sporty engine and transmission settings
R the vehicle pulling away in first gear
R the automatic transmission shifting up
later
R the fuel consumption possibly being higher
as a result of the later automatic
transmission shift points
Manual drive program M General notes
In this drive program, you can briefly change
gear yourself by using the steering wheel
paddle shifters. The transmission must be in
position
D.
You can activate manual drive program Min
the Eand Sautomatic drive programs.
i As well as temporary drive program M,
you can also activate permanent drive
program M(Ypage 151).
Further information about permanent drive
program M(Ypage 153).
Activating
X Shift the transmission to position D.
X Pull the left or right steering wheel paddle
shifter (Y page 152).
Manual drive program Mis temporarily
activated. The selected gear and Mappear
in the multifunction display. 152
Automatic transmissionDriving and parking

Upshifting
X
Briefly press the selector lever to the right
towards D+.
or
X Pull the right-hand steering wheel paddle
shifter (Y page 152).
In cases where it is permissible, the
automatic transmission shifts up to the
next gear.
i If the maximum engine speed on the
currently engaged gear is reached and you
continue to accelerate, the automatic
transmission automatically shifts up in
order to prevent engine damage.
Shift recommendation The gearshift recommendations assist you in
adopting an economical driving style. The
recommended gear is shown in the
multifunction display.
X Shift to recommended gear 0044according
to gearshift recommendation 0043when
shown in the multifunction display of the
instrument cluster.
Downshifting
X Briefly press the selector lever to the left
towards D–.
or
X Pull the left-hand steering wheel paddle
shifter (Y page 152).
In cases where it is permissible, the
automatic transmission shifts down to the
next gear.
i For maximum acceleration, push the
selector lever to the left or pull and hold the
left-hand steering wheel paddle shifter until the transmission shifts to the optimal gear
for the current speed.
i If the engine exceeds the maximum
engine speed when shifting down, the
automatic transmission protects against
engine damage by not shifting down.
i Automatic down shifting occurs when
coasting.
Disarming
If you have activated manual drive program
M, it will remain active for a certain amount
of time. Under certain conditions the
minimum amount of time is extended, e.g. in
the case of lateral acceleration, during an
overrun phase or when driving on steep
terrain.
If manual drive program Mhas been
deactivated, the automatic transmission
shifts into the automatic drive program that
was last selected, i.e. Eor S.
You can also deactivate manual drive
program Myourself:
X Pull on the right-hand steering wheel
paddle shifter and hold it in place
(Y page 152).
or
X Use the lever to switch the transmission
position.
or
X Use the program selector button to change
the drive program (Y page 151).
Manual drive program Mis deactivated.
The automatic transmission switches into
the automatic drive program that was last
selected, i.e. Eor S. Manual drive program
General information In this drive program, you can permanently
change gear yourself by using the steering
wheel paddle shifters. The transmission must
be in position
D. Automatic transmission
153Driving and parking Z

i
As well as this permanent drive program
M, you can also activate temporary drive
program M(Ypage 152).
Switching on the manual drive program Manual drive program
Mis different from
drive program Swith regard to spontaneity,
responsiveness and smoothness of gear
changes.
Manual drive program Mcan be selected
using the program selector button. You can
change gear using the steering wheel paddle
shifters or the selector lever in manual drive
program Mif the transmission is in position
D. The selected gear appears in the
multifunction display.
X Press the program selector button
(Y page 151) repeatedly until Mappears in
the multifunction display.
Upshifting X
Briefly press the selector lever to the right
towards D+.
or
X Pull the right-hand steering wheel paddle
shifter (Y page 152).
The automatic transmission shifts up to the
next gear.
Shift recommendation The gearshift recommendations assist you in
adopting an economical driving style. The
recommended gear is shown in the
multifunction display.
X Shift to recommended gear 0044according
to gearshift recommendation 0043when shown in the multifunction display of the
instrument cluster.
AMG vehicles !
In manual drive program M, the automatic
transmission does not shift up
automatically even when the engine
limiting speed for the current gear is
reached. When the engine limiting speed is
reached, the fuel supply is cut to prevent
the engine from overrevving. Always make
sure that the engine speed does not reach
the red area of the tachometer. There is
otherwise a risk of engine damage. 0043
Gear indicator
0044 Upshift indicator
Before the engine speed reaches the red area,
an upshift indicator will be shown in the
multifunction display.
X If the color in the speedometer
multifunction display changes to red and
the UP
UP display message is shown, shift up
a gear.
Downshifting X
Briefly press the selector lever to the left
towards D–.
or
X Pull the left-hand steering wheel paddle
shifter (Y page 152).
The automatic transmission shifts down to
the next gear.
i If you brake the vehicle or stop without
shifting down, the automatic transmission
will shift down to a gear that will allow the
vehicle to accelerate or pull away again. 154
Automatic transmissionDriving an
d parking

i
For maximum acceleration, push the
selector lever to the left or pull and hold the
left-hand steering wheel paddle shifter until
the transmission shifts to the optimal gear
for the current speed.
Kickdown You can also use kickdown for maximum
acceleration in manual drive program M.
X Depress the accelerator pedal beyond the
pressure point.
The automatic transmission shifts to a
lower gear depending on the engine speed.
i AMG vehicles: it is not possible to use
kickdown in manual drive program M.
Switching off the manual drive program X
Press the program selector button
(Y page 151) repeatedly until E(C in AMG
vehicles) or Sappears in the multifunction
display. Automatic transmission
155Driving and parking Z

Problems with the transmission
Problem Possible causes/consequences and
0050
0050Solutions The transmission has
problems shifting gear. The transmission is losing oil.
X
Have the transmission checked at a qualified specialist
workshop immediately. The acceleration ability
is deteriorating.
The transmission no
longer changes gear. The transmission is in emergency mode.
It is only possible to shift into
secondgear and reverse gear.
X Stop the vehicle.
X Shift the transmission to position P.
X Switch off the engine.
X Wait at least ten seconds before restarting the engine.
X Shift the transmission to position Dor R.
If D is selected, the transmission shifts into secondgear; ifRis
selected, the transmission shifts into reverse gear.
X Have the transmission checked at a qualified specialist
workshop, e.g. an authorized Mercedes-Benz Center,
immediately. Releasing the parking lock manually
! Do not use any sharp-edged objects to
remove the selector lever gaiter from the
center console. This could damage the
selector lever gaiter. X
Apply the electric parking brake.
X Press the frame of selector level gaiter 0043
together somewhat on the side edge at the
back and hold with one hand 0044.
X With the other hand, pry off the frame of
selector level gaiter 0043with a flat, blunt
object (e.g. a screwdriver wrapped in cloth) at rear edge
0087, pulling it up and out at the
same time.
X Press release button 0085down and
simultaneously move the selector lever out
of position P.
The selector lever can now be moved freely
until it is returned to position P.
In the event of an electrical malfunction, it is
possible to release the selector lever lock
manually to move it out of position P. This is
the case, for example, if you wish to tow the
vehicle away. Refueling
Important safety notes
G
WARNING
Fuel is highly flammable. If you handle fuel
incorrectly, there is a risk of fire and
explosion.
You must avoid fire, open flames, creating
sparks and smoking. Switch off the engine 156
RefuelingDriving and parking

and, if applicable, the auxiliary heating before
refueling. G
WARNING
Fuel is poisonous and hazardous to health.
There is a risk of injury.
You must make sure that fuel does not come
into contact with your skin, eyes or clothing
and that it is not swallowed. Do not inhale fuel
vapors. Keep fuel away from children.
If you or others come into contact with fuel,
observe the following:
R Wash away fuel from skin immediately
using soap and water.
R If fuel comes into contact with your eyes,
immediately rinse them thoroughly with
clean water. Seek medical assistance
without delay.
R If fuel is swallowed, seek medical
assistance without delay. Do not induce
vomiting.
R Immediately change out of clothing which
has come into contact with fuel. G
WARNING
Electrostatic buildup can create sparks and
ignite fuel vapors. There is a risk of fire and
explosion.
Always touch the vehicle body before opening
the fuel filler flap or touching the fuel pump
nozzle. Any existing electrostatic buildup is
thereby discharged.
! Do not use diesel to refuel vehicles with a
gasoline engine. Do not switch on the
ignition if you accidentally refuel with the
wrong fuel. Otherwise, the fuel will enter
the fuel system. Even small amounts of the
wrong fuel could result in damage to the
fuel system and the engine. Notify a
qualified specialist workshop and have the
fuel tank and fuel lines drained completely.
! Overfilling the fuel tank could damage the
fuel system. !
Take care not to spill any fuel on painted
surfaces. You could otherwise damage the
paintwork.
! Use a filter when refueling from a fuel can.
Otherwise, the fuel lines and/or injection
system could be blocked by particles from
the fuel can.
Do not get into the vehicle again during the
refueling process. Otherwise, electrostatic
charge could build up again.
If you overfill the fuel tank, fuel could spray
out when the fuel pump nozzle is removed.
For further information on fuel and fuel quality
(Y page 344). Refueling
Opening/closing the fuel filler flap 0043
Fuel filler flap
0044 To insert the fuel filler cap
0087 Tire pressure table
0085 Fuel type to be used
The fuel filler flap is unlocked or locked
automatically when you open or close the
vehicle with the SmartKey or with KEYLESS-
GO.
The position of the fuel filler cap is displayed
00B6 in the instrument cluster. The arrow
next to the filling pump indicates the side of
the vehicle. Refueling
157Driving and parking Z