2008 MERCEDES-BENZ CLS COUPE fuel pressure

Tyres and wheels
201
The pressure of warm tyres should only be
corrected
if it is too low for the current oper-
ating conditions.
You will find a table of tyre pressures for var-
ious operating conditions on the inside of
your vehicle's fuel filler flap.
Driving with tyre pressure that is too high or
too low can:
R shorten the service life of the tyres
R cause increased tyre damage
R have a negative effect on handling charac-
teristics (e.g. by causing aquaplaning)
i The tyre pressure values given for low
loads are minimum values which offer you
good ride comfort characteristics.
You can, however, also use the values given
for higher loads. These are permissible and
will not adversely affect the running of the
vehicle.
Also check the tyre pressure of the spare
wheel*. H
Environmental note
Check the tyre pressure regularly, and at
least every 14 days. Tyre pressure loss warning system
G
Risk of accident
The tyre pressure loss warning system does
not
warn you of an incorrectly set tyre pres-
sure. The table on the inside of the fuel filler
flap will help you decide whether the tyre
pressures should be corrected.
The tyre pressure loss warning system does
not replace the need to regularly check
your vehicle's tyre pressures, since an even
loss of pressure on several tyres at the
same time cannot be detected by the tyre
pressure loss warning system.
The tyre pressure loss warning system is
not able to warn you of a sudden loss of
pressure, e.g. if the tyre is penetrated by a
foreign object.
In the event of a sudden loss of pressure,
bring the vehicle to a halt by braking care-
fully. Do not make any sudden steering
movements when doing so.
While the vehicle is in motion, the tyre pres-
sure loss warning system monitors the set
tyre pressure using the rotational speed of
the wheels. This enables the system to detect
significant pressure loss in a tyre. If the speed
of rotation of a wheel changes as a result of
a loss of pressure, a corresponding warning message will appear in the multi-function dis-
play.
The

function of the tyre pressure loss warning
system is limited or delayed if:
R snow chains are fitted to your vehicle's
tyres
R road conditions are wintry
R you are driving on sand or gravel
R you adopt a very sporty driving style (cor-
nering at high speeds or driving with high
rates of acceleration)
R you are driving with a heavy load (in the
vehicle or on the roof)
Restarting the tyre pressure loss warn-
ing system Restart the tyre pressure loss warning system
if you have:
R
changed the tyre pressure
R changed the wheels or tyres
R fitted new wheels or tyres
X Before restarting, consult the table of tyre
pressures

on the inside of the fuel filler flap
to ensure that the tyre pressure in all four Operation
* optional
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Tyres and wheels
202tyres is set correctly for the operating con-
ditions concerned.
X Also observe the notes in the section on
tyre pressures ( Y page 200). G
Risk of accident
The tyre pressure loss warning system can
only give reliable warnings if you have set
the correct tyre pressure.
If an incorrect tyre pressure is set, these
incorrect values will be monitored.
A tyre with insufficient pressure results in
an instability of the vehicle when driving,
thus increasing the risk of an accident.
X Make sure that the key is in position 2 in
the ignition lock.
The standard display appears in the multi-
function display ( Y page 115).
X Press k or j to select the tyre pres-
sure function:
Run Flat Indicator active
Menu: R-Button æ
X Press the reset button on the left of the
instrument cluster.
The following message appears in the
multi-function display:
Restart Run Flat Indicator? Yes Cancel
If you wish to confirm the restart:
X Press the æ button.
The following message appears in the
multi-function display:
Run Flat Indicator restarted
After a teach-in period, the tyre pressure
loss warning system will monitor the set
tyre pressures of all four tyres.
If you wish to cancel the restart:
X Press the ç button.
or
X Wait until the message
Restart Run Flat Indicator?
Yes Cancel disappears.
The tyre pressure values stored at the last
restart will continue to be monitored. Checking the tyre pressure electroni-
cally*
The tyre pressure monitor only functions if
the correct wheel electronics are fitted to all
wheels.

These monitor the pressure in all four
tyres, which you have set when restarting the
tyre pressure monitor. The monitor warns you
when the pressure drops in one or more of
the tyres. G
Risk of accident
The tyre pressure monitor does not warn
you
of an incorrectly set tyre pressure. The
table on the inside of the fuel filler flap will
help you decide whether the tyre pressures
should be corrected.
The tyre pressure monitor is not able to
warn you of a sudden loss of pressure, e.g.
if the tyre is penetrated by a foreign object.
In the event of a sudden loss of pressure,
bring the vehicle to a halt by braking care-
fully. Do not make any sudden steering
movements when doing so.
i The operation of the tyre pressure moni-
tor can be affected by interference from
radio transmitting equipment (e.g. radio
headphones, two-way radios) that may be
being operated in or near the vehicle. Operation
* optional
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Tyres and wheels
203
i
If you are carrying a deflated tyre in the
vehicle, you may only reactivate the tyre
pressure monitor if:
R the deflated tyre is no longer in the vehi-
cle
R you have adjusted the tyre pressure cor-
rectly
Calling up the tyre pressure using the
on-board computer X
Make sure that the key is in position 2 in
the ignition lock.
X Press the j or k button to select the
tyre pressure function. The current tyre pressure for each wheel will
be displayed.
If the vehicle has been parked for longer than
20 minutes or you have not driven faster than
25 km/h since the vehicle was parked, the
following message appears: Tyre pressure displayed only after
driving for a few minutes
i
The tyre pressure values indicated by the
on-board computer may differ from those
measured at a filling station with a pressure
gauge. The tyres pressures shown by the
on-board computer refer to those meas-
ured at sea level. The tyre pressure values
indicated by the on-board computer may
differ when the vehicle is at high altitude.
In this case, do not reduce the tyre pres-
sures.
Tyre pressure warning If the tyre pressure on one or more wheels
drops significantly, a message appears in the
multi-function display.
The tyre pressure of the affected wheel(s) will
be displayed in a red rectangle. You will also
hear a warning tone.
Restarting the tyre pressure monitor
In most cases, the tyre pressure monitor will
automatically detect the new reference val-
ues, e.g. if you have:R
changed the tyre pressure
R changed the wheels or tyres
R fitted new wheels or tyres
If you wish to define the new reference values
manually:
X Use the table on the inside of the fuel filler
flap to ensure that the tyre pressure is set
correctly in all four tyres for the current
operating conditions.
Also observe the notes in the section on
tyre pressures ( Y page 200).
X Make sure that the key is in position 2 in
the ignition lock.
The standard display appears in the multi-
function display ( Y page 115).
X Press the j or k button to select the
Tyre pressure function or wait until the
following message appears:
Tyre pressure displayed only after
driving for a few minutes Operation
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Display messages
237Display messages Possible cause/consequence Possible solution
N Check engine oil
level when next
refuelling The engine oil level has dropped to a crit-
ical level. X
Check the engine oil level (Y page 195) and top
up the engine oil if necessary.
X Have the engine checked for leaks if the engine
oil needs topping up more often than usual. ± Display malfunc-
tion Consult work-
shop One or more electronic systems are
unable to deliver information to the on-
board computer. The following systems
may have failed:
R
Coolant temperature gauge
R Rev counter
R Cruise control or Speedtronic display X
Visit a qualified specialist workshop. H Tyre pressure Cau-
tion Tyre defect One or more tyres are losing air rapidly.
The affected wheel is highlighted in the
tyre pressure display of the tyre pressure
monitor*. X
Stop the vehicle without making any sudden
steering

or braking manoeuvres. Pay attention
to the traffic conditions as you do so.
X Repair or change the tyre (Y page 276). Practical advice
* optional
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Troubleshooting
248 Problem Possible cause/consequence Suggested solutions
±
The yellow engine diagnos-
tics warning lamp comes
on
while the engine is run-
ning. There may be a malfunction:
R
in the fuel injection system
R in the exhaust system
R in
the ignition system (on vehi-
cles with a petrol engine)
The emission limit values may be
exceeded and the engine may be
running in emergency mode. X
Have the vehicle checked as soon as possible at a qualified spe-
cialist workshop. H
The yellow tyre pressure
monitor* warning lamp is
on. G
Risk of accident
The tyre pressure monitor* has
detected a sudden or significant
pressure loss in at least one of
the tyres. X
Stop the vehicle without making any sudden steering or braking
manoeuvres. Pay attention to the traffic conditions as you do so.
X Observe the additional messages in the multi-function display
(Y page 219).
The warning light will go out after the flat tyre has been changed
and you have been driving for a few minutes. 1
The red SRS warning lamp
is lit while the engine is
running. G
Risk of injury
The restraint systems are faulty.
The airbags or belt tensioners
may either be triggered uninten-
tionally

or, in the event of an acci-
dent, not be triggered at all. X
Visit a qualified specialist workshop immediately. Practical advice
* optional
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Flat tyre
280 G
Risk of accident
If the tyre pressure is now lower than
1.3 bar, the tyre is too badly damaged. Do
not drive any further. Consult a qualified
specialist workshop which has the neces-
sary specialist knowledge and tools to carry
out the work required. Mercedes-Benz rec-
ommends that you use a Mercedes-Benz
Service Centre for this purpose. In particu-
lar, work relevant to safety or on safety-
related systems must be carried out at a
qualified specialist workshop.
X If the tyre pressure is still at least 1.3 bar,
correct it (see fuel filler flap for values).
To increase the tyre pressure: switch on
the electric air pump.
To reduce the tyre pressure: open pres-
sure release screw a on pressure
gauge b.
X Drive to the nearest workshop and have the
tyre changed there.
X Have the TIREFIT kit replaced as soon as
possible at a qualified specialist workshop,
e.g. at a Mercedes-Benz Service Centre. G
Risk of accident
Do not exceed the maximum speed of 80
km/h.
The “max. 80 km/h” sticker must be affixed
within the driver's field of vision.
The vehicle's handling characteristics may
be affected. H
Environmental note
Have the used TIREFIT kit disposed of pro-
fessionally, e.g. at a Mercedes-Benz
Service Centre.
X Have the TIREFIT kit replaced every four
years at a qualified specialist workshop,
e.g. a Mercedes-Benz Service Centre. Version 2 1
TIREFIT sealant filler bottle
2 Recess
3 On/off switch
4 Electric connector with cable
5 Air pump hose
6 Flange
X Pull connector with cable 4 and air pump
hose 5 from the housing.
X Screw air pump hose 5 onto flange 6 of
TIREFIT filler bottle 1.
X Place TIREFIT sealant filler bottle 1 head
downwards into recess 2 of the electric
air pump. Practical advice
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Flat tyre
282 G
Risk of accident
If the tyre pressure is now lower than
1.3 bar, the tyre is too badly damaged. Do
not drive any further. Consult a qualified
specialist workshop which has the neces-
sary specialist knowledge and tools to carry
out the work required. Mercedes-Benz rec-
ommends that you use a Mercedes-Benz
Service Centre for this purpose. In particu-
lar, work relevant to safety or on safety-
related systems must be carried out at a
qualified specialist workshop.9 Pressure release button
a Pressure gauge
X If the tyre pressure is still at least 1.3 bar,
correct it (see fuel filler flap for values). To increase the tyre pressure:
switch on
the electric air pump.
To reduce the tyre pressure: press yellow
pressure release button 9 next to pres-
sure gauge a.
X Drive to the nearest workshop and have the
tyre changed there.
X Have the TIREFIT kit replaced as soon as
possible at a qualified specialist workshop,
e.g. at a Mercedes-Benz Service Centre.
G Risk of accident
Do not exceed the maximum speed of 80
km/h.
The “max. 80 km/h” sticker must be affixed
within the driver's field of vision.
The vehicle's handling characteristics may
be affected.
H Environmental note
Have the used TIREFIT kit disposed of pro-
fessionally, e.g. at a Mercedes-Benz
Service Centre.
X Have the TIREFIT kit replaced every four
years at a qualified specialist workshop,
e.g. a Mercedes-Benz Service Centre.
Changing a wheel and fitting the spare
wheel*
G Risk of accident
The wheel dimensions and tyre size of the
spare wheel*, the emergency spare
wheel* and standard wheels may differ
from one another.
Your vehicle's handling characteristics will
be altered when a "Minispare"/collapsible
emergency spare wheel* is fitted. Adapt
your style of driving accordingly.
The “Minispare”/collapsible emergency
spare wheel* must only be used as a tem-
porary measure. Do not exceed the maxi-
mum speed of 80 km/h and do not
deactivate ESP ®
.
Never drive the vehicle with more than one
“Minispare”/collapsible emergency spare
wheel* fitted.
G Risk of accident
Have the “Minispare”/collapsible emer-
gency spare wheel* or the spare wheel*
replaced with a new wheel as soon as pos-
sible at a qualified specialist workshop
which has the necessary specialist knowl-
edge and tools to carry out the work
Practical advice
* optional
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Tyres and wheels
304 Tyres and wheels
! For safety reasons, Mercedes-Benz rec-
ommends that you only use tyres which
have been approved by Mercedes-Benz
specifically
for your vehicle. These tyres are
specially adapted for use with the control
systems, such as ABS or ESP ®
, and are
marked as follows:
R MO = Mercedes-Benz Original
R MOE = Mercedes-Benz Original Exten-
ded* (with run-flat characteristics)
If you use other tyres, Mercedes-Benz can-
not accept any responsibility for damage
which may occur. Information about tyres
can be obtained from any Mercedes-Benz
Service Centre.
! If you fit tyres other than those tested and
recommended by Mercedes-Benz, charac-
teristics such as handling, noise levels and
fuel consumption, etc. may be adversely
affected. In addition, when driving with a
load, dimensional variations and different
tyre deformation characteristics could
cause the tyres to make contact with the
bodywork and axle components. This could
result in damage to the tyres or the vehicle. i
Further information about tyres and
wheels can be obtained from any
Mercedes-Benz Service Centre.
You
will find a table of tyre pressures on the
inside of your vehicle's fuel filler flap . You
will find further information about tyre pres-
sures in the "Operation" section
(Y page 200). Technical data
* optional
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