engine SMART FORTWO 2016 Repair Manual

tions. Even a small amount of alcohol or
drugs can affect your reflexes, perceptions
and judgment.
The possibility of a serious or even fatal
accident is greatly increased when you
drink or take drugs and drive.
Do not drink or take drugs and drive or
allow anyone to drive who has been drinkingor taking drugs.
Emission control
GWARNING
Combustion engines emit poisonous
exhaust gases such as carbon monoxide.
Inhaling these exhaust gases leads to poi-
soning. There is a risk of fatal injury.
Therefore never leave the engine running
in enclosed spaces without sufficient ven- tilation.
Certain engine systems are designed to keep
the level of poisonous components in exhaust
fumes within legal limits.
These systems only work at peak efficiency if
they are serviced exactly in accordance with
the manufacturer's specifications. There-
fore, only allow qualified and authorized
technicians to perform work on the engine.
The engine settings must not be changed
under any circumstances. Furthermore, all
specific service work must be performed at
regular intervals and in accordance with
smart service requirements. Details can be
found in the Maintenance Booklet.
Braking
Important safety notes
GWARNING
If you shift down on a slippery road surface
in an attempt to increase the engine's
braking effect, the drive wheels could lose
their grip. There is an increased danger of
skidding and accidents.
Do not shift down for additional engine
braking on a slippery road surface.
Downhill gradients
!On long and steep gradients, you must
reduce the load on the brakes by shifting to
a lower gear in good time. This allows you
to take advantage of the engine's braking
effect. This helps you to avoid overheating
the brakes and wearing them out exces-
sively.
When you take advantage of the engine's
braking effect, a drive wheel may not turn
for some time, e.g. on a slippery road sur-
face. This could cause damage to the drive
train, which is not covered by the smart
warranty.
Heavy and light loads
GWARNING
If you rest your foot on the brake pedal
while driving, the braking system can
overheat. This increases the stopping dis-
tance and can even cause the braking system
to fail. There is a risk of an accident.
Never use the brake pedal as a footrest.
Never depress the brake pedal and the
accelerator pedal at the same time.
!Depressing the brake pedal constantly
results in excessive and premature wear to
the brake pads.
If the brakes have been subjected to a heavy
load, do not stop the vehicle immediately.
Drive on for a short while. This allows the
airflow to cool the brakes more quickly.
Wet roads
If you have driven for a long time in heavy
rain without braking, there may be a delayed
reaction from the brakes when braking for the
first time. This may also occur after the vehi-
cle has been washed or driven through deep
water.
You then have to depress the brake pedal more
firmly. Maintain a greater distance from the
vehicle in front.
After driving on a wet road or having the
vehicle washed, brake firmly while paying
attention to the traffic conditions. This will warm up the brake discs, thereby drying them
Driving tips103
>> Driving and parking.
Z

more quickly and protecting them against
corrosion.
Limited braking performance on salt-
treated roads
If you drive on salted roads, a layer of salt
residue may form on the brake discs and brake
pads. This can result in a significantly lon-
ger braking distance.
RBrake occasionally to remove any possible
salt residue. Make sure that you do not
endanger other road users when doing so.
RCarefully depress the brake pedal and the
beginning and end of a journey.
RMaintain a greater distance to the vehicle
ahead.
Servicing the brakes
!The brake fluid level may be too low, if:
Rif the red brake warning lamp lights up
in the instrument cluster and
Ryou hear a warning tone while the engine
is running
Observe additional warning messages in
the multifunction display.
The brake fluid level may be too low due to
brake pad wear or leaking brake lines.
Have the brake system checked immedi-
ately. Consult a qualified specialist work-
shop to arrange this.
!A function or performance test should
only be carried out on a 2-axle dynamome-
ter. If you wish to operate the vehicle on
such a dynamometer, please consult a
qualified specialist workshop in advance.
You could otherwise damage the drive train
or the brake system.
!As the ESP®system operates automati-
cally, the engine and the ignition must be
switched off (the SmartKey must be in posi-
tion 0or 1in the ignition lock) if:
Rthe parking brake is tested using a brake
dynamometer (maximum 10 seconds).
Rthe vehicle is towed with the front axle
raised.
Braking triggered automatically by ESP
®
may seriously damage the brake system. All checks and maintenance work on the brake
system must be carried out at a qualified
specialist workshop.
Have brake pads installed and brake fluid
replaced at a qualified specialist workshop.
If the brake system has only been subject to
moderate loads, you should test the function-
ality of your brakes at regular intervals.
When having brake pads/linings fitted, smart
recommends that you only use those which are
approved for smart vehicles or are of an
equivalent quality standard. Brake pads/
linings which have not been approved for
smart vehicles or which are not of an equiv-
alent quality could affect your vehicle's
operating safety.
smart recommends that you only use brake
fluid which is approved for smart vehicles or
is of an equivalent quality standard. Brake
fluid which has not been approved for smart
vehicles or which
is not of an equivalent
quality could affect your vehicle's operating
safety.
Driving on wet roads
Hydroplaning
If water has accumulated to a certain depth on the road surface, there is a danger of hydro-
planing occurring, even if:
Ryou drive at low speeds.
Rthe tires have adequate tread depth.
For this reason, in the event of heavy rain or in conditions in which hydroplaning may
occur, you must drive in the following man-
ner:
Rlower your speed.
Ravoid ruts.
Ravoid sudden steering movements
Rbrake carefully.
Driving on flooded roads
!Bear in mind that vehicles traveling in
front or in the opposite direction create
waves. This may cause the maximum per-
missible water depth to be exceeded.
Failure to observe these notes may result in damage to the engine, electrical systems
and transmission.
104Driving tips
>> Driving and parking.

Prevent water from entering the vehicle inte-
rior or the engine compartment. If you must
drive through standing water, bear in mind
that:
Rthe water level should not exceed the lower
edge of the vehicle body in still water
Ryou should drive no faster than at walking
pace.
Winter driving
GWARNING
If you shift down on a slippery road surface
in an attempt to increase the engine's
braking effect, the drive wheels could lose
their grip. There is an increased danger of
skidding and accidents.
Do not shift down for additional engine
braking on a slippery road surface.
GDANGER
If the exhaust pipe is blocked or adequate
ventilation is not possible, poisonous
gases such as carbon monoxide (CO) may
enter the vehicle. This is the case, e.g. if
the vehicle becomes trapped in snow. There
is a risk of fatal injury.
If you have to leave the engine running,
keep the exhaust pipe and the area around
the vehicle free of snow. To ensure an ade- quate supply of fresh air, open a window on
the side of the vehicle that is not facing
into the wind.
Have your vehicle winterproofed at a quali-
fied specialist workshop at the onset of win-
ter.
Drive particularly carefully on slippery road
surfaces. Avoid sudden acceleration, steer-
ing and braking maneuvers. Do not use cruise
control.
If the vehicle threatens to skid or cannot be
stopped when moving at low speed:
XTry to bring the vehicle under control
using corrective steering.
XVehicles with automatic transmission:
shift the transmission to position N.The outside temperature indicator is not
designed to serve as an ice-warning device
and is therefore unsuitable for that purpose.
Changes in the outside temperature are dis-
played after a short delay.
Indicated temperatures just above the freez-
ing point do not guarantee that the road sur-
face is free of ice. The road may still be icy,
especially in wooded areas or on bridges.
You should pay special attention to road con-
ditions when temperatures are around freez-
ing point.
For more information on driving with snow
chains, see (
Ypage 179).
For more information on driving with summer
tires, see (
Ypage 179).
Observe the notes in the "Winter operation"
section (
Ypage 179).
Driving systems
Cruise control
General notes
Cruise control maintains a constant road
speed for you. Cruise control does not brake
the vehicle automatically. Only the engine's
braking effect is available. In order to
reduce speed and maintain distance to other
road users, you need to brake yourself. This
interrupts cruise control.
Use cruise control only if road and traffic
conditions make it appropriate to maintain a steady speed for a prolonged period. You can
use cruise control at speeds 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 road,
weather or traffic conditions. Cruise control
is only an aid. You are responsible for the
distance to the vehicle in front, for vehicle
speed, for braking in good time and for stay-ing in lane.
Driving systems105
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Do not use cruise control:
Rin road and traffic conditions which do not
allow you to maintain a constant speed e.g.
in heavy traffic or on winding roads
Ron slippery road surfaces. Braking or
accelerating could cause the drive wheels
to lose traction and the vehicle could then
skid
Rwhen 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.
Cruise control buttons
0043Activates/deactivates cruise control
0044Stores, increases or reduces the current
speed
0087Calls up the last speed stored
0085Interrupts cruise control
Activating cruise control
Cruise control must be activated before it can
be used.
XPress switch 0043(ON).
Cruise control is activated.
The 0085 symbol appears in the multifunc-
tion display.
iWhen you switch off the engine, cruise
control remains activated and the last
speed stored is cleared.
Storing and maintaining the current
speed
While cruise control is active, you can set the
current speed starting from 20 mph (30 km/h).
XAccelerate the vehicle to the desired
speed.
XPress switch 0044(®) and release it.
XRemove your foot from the accelerator
pedal.
Cruise control is activated. The vehicle
automatically maintains the stored speed.
0085 SET
is shown in the multifunction
display.
iCruise control may be unable to maintain
the stored speed on uphill gradients. The
stored speed is resumed when the gradient
evens out.
On downhill gradients, only the engine's
braking effect is available. You have to
operate the brakes yourself to reduce
speed. This interrupts cruise control.
Calling up the last speed stored
GWARNING
If you call up the stored speed and it is
different to the current speed, the vehicle
will accelerate. If you are not aware of the
stored speed, the vehicle may accelerate
unexpectedly. There is a risk of an acci-
dent.
Pay attention to the road and traffic con-
ditions before calling up the stored speed. If you do not know the stored speed, store
the desired speed again.
XPress button 0087° and release it.
Cruise control is activated and adjusts the vehicle's speed to the last speed stored.
XRemove your foot from the accelerator
pedal.
iWhen you switch off the engine, the last
speed stored is cleared.
Increasing or decreasing the speed
In order to be able to increase or decrease the
speed, a speed must already have been stored.
iCruise control is not deactivated if you
depress the accelerator pedal. For exam-
ple, if you accelerate briefly to overtake,
cruise control adjusts the vehicle's speed
to the last speed stored after you have fin-
ished overtaking.
106Driving systems
>> Driving and parking.

R®: increases the speed
R−: decreases the speed
XPress switch0044(®) or (−) repeatedly
until the desired speed is reached.
The speed is gradually increased or
reduced.
or
XPress and hold switch 0044(®) or (−) until
the desired speed is reached.
XRelease the switch.
The new speed is stored.
Interrupting cruise control
When cruise control is switched on, you can
cancel cruise control at any time and call up
the stored speed again later.
iWhen you switch off the engine, the last
speed stored is cleared.
XPress button 0085± and release it.
or
XBrake.
Cruise control is interrupted.
Cruise control is also canceled when:
Ryou engage the parking brake
Ryou depress the clutch
Resp®intervenes
Deactivating cruise control
XPress switch 0043(OFF).
Cruise control is deactivated.
The 0085 symbol goes out in the multifunc-
tion display.
Parking aid
General notes
The rear parking aid uses an acoustic signal
to indicate the distance between your vehicle
and an obstacle. If you engage reverse gear
while the engine is running, the parking aid is activated automatically.
The parking aid uses three sensors 0043in the
rear bumper to monitor the area behind your
vehicle. The sensors must be free from dirt,
ice or slush. They can otherwise not function
correctly. Clean the sensors regularly, tak-
ing care not to scratch or damage them.
When reverse gear is engaged the system
measures the distance between your vehicle
and an object. If the proximity to the object
behind the vehicle is less than 4.0 ft (1.20 m)
a beeping sound is issued. As the distance to
the object decreases the frequency increa-
ses. When the object is a maximum of 1.0 ft
(30 cm) a continuous tone is issued.
Important safety notes
The parking aid feature is only intended as an
aid. It is not a replacement for your attention
to your immediate surroundings. You are
always responsible for safe maneuvering,
parking and exiting a parking space. When
maneuvering, parking or pulling out of a
parking space, make sure that there are no
persons, animals or objects in the area in
which you are maneuvering.
!When parking, pay particular attention to
objects above or below the sensors, such as
flower pots or trailer drawbars. The park-
ing aid does not detect such objects if they
are in the immediate vicinity of the vehi-
cle. You could damage the vehicle or the
objects.
The sensors may not detect snow and other
objects that absorb ultrasonic waves.
Ultrasonic sources such as an automatic car
wash, the compressed-air brakes of a truck
or a pneumatic drill could cause the park-
ing aid to malfunction.
The parking aid may not function correctly
on uneven terrain.
Driving systems107
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The parking aid does not take into account
obstacles located:
Rbelow the detection range, e.g. people,
animals or objects
Rabove the detection range, e.g. overhang-
ing loads, truck overhangs or loading
ramps.
Deactivating/activating the parking aid
XPress button0044.
Indicator lamp 0043lights up. The system is
deactivated.
XPress button 0044again.
Indicator lamp 0043goes out. The system is
reactivated.
iThe parking aid is automatically activa-
ted when you start the engine.
If you engage reverse gear while the engine is
running, the parking aid is activated auto-
matically. An acoustic signal sounds when
reverse gear is selected.
If reverse gear is no longer engaged, the
parking aid is deactivated.
108Driving systems
>> Driving and parking.

Changes in the outside temperature are dis-
played after a short delay.
You can set the temperature unit of the out-
door temperature display (
Ypage 116).
Fuel gauge
Fuel gauge
0043
Reserve fuel display
0044Fuel gauge
0087Fuel filler flap location indicator
0080The fuel filler cap is located on the
right
008500B4 Reserve fuel (yellow)
Fuel gauge 0044is shown in the display as a
segment display with eight segments.
When the fuel level falls below the reserve
range of 5.0 l, the last illuminated segment of
the fuel display will flash and a warning tone
will sound. Reserve fuel display 0043will also
appear. The reserve fuel display shows the
numeric value of the remaining fuel level in
0.5 l increments.
In addition:
R00B4 symbol 0085also appears in yellow
Ra display message is also shown
(Ypage 125).
Dashboard instruments
!Do not drive in the overrevving range, as
this could damage the engine.
HEnvironmental note
Avoid driving at high engine speeds. This
unnecessarily increases the fuel consump-
tion of your vehicle and harms the envi-
ronment as a result of increased emissions.
The overrevving range of the engine is shown with dashed lines in the orange marking of
rev counter 0043. The fuel supply is interrupted
to protect the engine when the overrevving
range is reached.
Dashboard clock 0044is synchronized with the
clock in the on-board computer.
Rev counter 0043, together with dashboard
clock 0044, can be rotated approximately 60° on
the dashboard.
You can additionally set the brightness of the
instrument cluster lighting to different lev-
els (
Ypage 115).
110Displays and operation
>> On-board computer and displays.

XPress the0063or0064 button on the steer-
ing wheel to select the display of current
fuel consumption.
The display shows the fuel consumption over
the previous 15 minutes as a bar chart. The
display additionally shows the current fuel
consumption as a numeric value in the upper
right section of the display.
If you switch off the ignition, or change the
distance unit, the fuel consumption data is
deleted automatically.
You can change the distance unit in the Dis‐
playsubmenu (Ypage 116).
Coolant temperature menu
Under normal operating conditions and with
the specified coolant level, the coolant tem-
perature may rise to 230‡(110 †).
Example: coolant temperature
XPress the 0063or0064 button on the steer-
ing wheel to select the coolant temperature
display.
The display shows the current coolant tem-
perature as a bar in the range between 50
and 110 †.
If the coolant temperature rises above
110 †, then the display shows a display
message (
Ypage 125). Observe the display
message. You could otherwise damage the
engine.
You can change the temperature unit in the
Display
submenu (Ypage 116).
Messages and service menu
Example: messages and service
If you have hidden display messages these are
saved in the message memory. The menu shows
the number of display messages in message
memory 0043and next service due date 0044
(
Ypage 153). The message memory can only be
called up when the ignition is switched on.
XPress the 0063or0064 button on the steer-
ing wheel to select the MessagesandSer‐vicemenu.
The display shows the number of display
messages in the message memory and the
next service due date.
If there are no display messages, then the
value in brackets is 0 and the information
on the 0076button is hidden.
XTo show display messages: press the0076
button on the steering wheel.
The lower area on the right of the display
shows the display message, its list number
and then number of display messages in the
message memory.
XPress 0063to scroll through the display
messages in the message memory.
Pressing 0064only allows you to scroll
back to messages which have already been
read.
If you scroll back from the first display
message using 0064, theMessages and
Servicemenu will again be shown in the
display. Existing display messages are not
shown.
Menus and sub menus113
>> On-board computer and displays.
Z

Display messagesPossible causes/consequences and0050Solutions
^
Distance WarningInoperative
The distance warning function is temporarily inoperative. Pos-
sible causes are:
Rthe smart logo in the radiator trim is dirty.
Rfunction is impaired due to heavy rain or snow.
Rthe radar sensor system is temporarily inoperative, e.g. due to
electromagnetic radiation emitted by nearby TV or radio sta-
tions or other sources of electromagnetic radiation.
Rthe system is outside the operating temperature range.
Rthe on-board voltage is too low.
When the causes stated above no longer apply, the display message
disappears.
The distance warning function is operational again.
If the display message does not disappear:
XPull over and stop the vehicle safely as soon as possible, paying
attention to road and traffic conditions.
XSecure the vehicle against rolling away (Ypage 100).
XClean the smart logo in the radiator trim (Ypage 158).
XRestart the engine.
^
Electronics Mal‐functionVisitWork‐shop
The distance warning function is malfunctioning or temporarily
inoperative. Possible causes are:
Rthe smart logo in the radiator trim is dirty.
Rfunction is impaired due to heavy rain or snow.
Rthe radar sensor system is temporarily inoperative, e.g. due to
electromagnetic radiation emitted by nearby TV or radio sta-
tions or other sources of electromagnetic radiation.
Rthe system is outside the operating temperature range.
Rthe on-board voltage is too low.
If the causes listed above no longer apply, the distance warning
function is operational again.
If the display message continues to light up, the electronics of the
distance warning function are malfunctioning.
XVisit a qualified specialist workshop.
Display messages123
>> On-board computer and displays.
Z

Engine
Display messagesPossible causes/consequences and0050Solutions
00B9
Reduced Power SeeOperator's Manual
The engine is running in emergency mode. For example, the fuel
injection may be faulty.
XDrive on carefully.
XVisit a qualified specialist workshop immediately.
iIn some states, you must immediately visit a qualified spe-
cialist workshop as soon as the yellow Check Engine warning
lamp lights up. This depends on the locally applicable legal
requirements. If in doubt, check whether such legal regulations
apply in the state in which you are currently driving.
00EF
Malfunction VisitWorkshop
The battery monitoring is malfunctioning.
XVisit a qualified specialist workshop.
00EF
StopSeeOperator'sManual
The battery is not being charged.
Possible causes are:
Ra defective alternator
Ra torn poly-V-belt
Ra malfunction in the electronics
XPull over and stop the vehicle safely and switch off the engine,
paying attention to road and traffic conditions.
!Do not continue driving. The engine could otherwise overheat.
XSecure the vehicle against rolling away (Ypage 100).
XConsult a qualified specialist workshop.
00B3
Stop Switch OffEngine
The oil pressure is too low. There is a risk of engine damage.
XPull over and stop the vehicle safely and switch off the engine,
paying attention to road and traffic conditions.
XSecure the vehicle against rolling away (Ypage 100).
XCheck the oil level (Ypage 150).
XIf necessary, add engine oil (Ypage 150).
Information on approved engine oils can also be obtained from any
qualified specialist workshop.
124Display messages
>> On-board computer and displays.