check engine MERCEDES-BENZ C-CLASS SALOON 2007 User Guide

Driving sys
tems 14
9
You can set a variable or permanent limit
speed:
R Variable for speed limits, e.g. in built-up
areas
R Permanent for long-term speed restric-
tions, e.g. for driving on winter tyres
( Y page 151 ) G
Risk of accident
Speedtronic is only an aid designed to
assist driving. You are responsible for the
vehicle's speed and for braking in goo d
time.
i The speed indicated in the speedometer
may differ slightly from the limit speed
stored.
Variable Speedtronic You can operate cruise control* and variable
Speedtronic with the cruise control lever.
The LIM indicator lamp on the cruise control
lever indicates which system you have selec-
ted:
R
LIM indicator lamp off:
Cruise control* is selected
R LIM indicator lamp lit: Variable Speedtronic is selected
You can use the cruise control lever to restrict
the speed to any speed above 30 km/h while
the engine is running . 1
To store the current speed or a higher
speed
2 LIM indicator lamp
3 To select the current or last stored speed
4 To store the current speed or a lower
speed
5 To switch between cruise control* and
variable Speedtronic
6 To deactivate variable Speedtronic Selecting variable Speedtronic X
Check whether LIM indicator lamp 2is on.
If it is on, variable Speedtronic is already
selected.
If it is not, press the cruise control lever in
the direction of arrow 5.
LIM indicator lamp 2in the cruise control
lever lights up. Variable Speedtronic is
selected. G
Risk of accident
If there is a change of drivers, advise the
new driver of the limit speed stored.
Only use variable Speedtronic if you are
sure that you will not have to accelerate
suddenly to a speed above that stored as
the limit speed, otherwise you could cause
an accident.
You can only exceed the limit speed store d
if you deactivate variable Speedtronic :
R using the cruise control leve r
R if you depress the accelerator pedal
beyond the pressure point (kickdown )
It is not possible to deactivate variable
Speedtronic by braking. Controls
* optional
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Engine compartment
208 Engine oil
Depending on how it is driven, the vehicl e
consumes a maximum of 0.8 l oil per 1,000
km. The oil consumption may be higher than
this when the vehicle is new or if you fre-
quently drive at high engine speeds. You can
only estimate the oil consumption after yo u
have driven a considerable distance.
You will find further information about engine
oil in the "Technical data" section
( Y page 336).
Checking the engine oil level Before checking the engine oil level the fol-
lowing conditions for the vehicle should be
met:
R
It should be parked on level ground
R The engine should be switched off for at
least five minutes if the engine was at nor-
mal operating temperature
R The engine should be switched off for at
least 30 minutes if the engine was not at
operating temperature (i.e. if you only star-
ted the engine briefly) Using the oil dipstick
Illustration: vehicle with a petrol engine
1
Oil dipstick
2 Upper mark
3 Lower mark Example illustration of a vehicle with a diese
l
engine
1 Oil dipstick
2 Upper mark
3 Lower mark
X Pull oil dipstick 1out of the oil dipstick
tube.
X Wide off oil dipstick 1.
X Insert oil dipstick 1into the oil dipstick
tube to the stop, and take it out again.
The oil level is correct if the level is between
lower mark 3and upper mark 2.
X Top up the oil if necessary (Y page 209).
i The difference in quantity between lower
mark 3and upper mark 2is approxi-
mately 2 litres. Operation
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Engine compartment
209
Topping up the engine oil
Illustration: vehicle with a petrol engin
e
1 Cove r Example illustration of a vehicle with a diese
l
engine
1 Cove r X
Unscrew cap 1and remove it.
X Top up by the amount of oil required.
! Do not add too much oil. If too much oil
is added, there is a risk of damage to the
engine or the catalytic converter.
X Screw cap 1onto the filler neck. H
Environmental not
e
When topping up the oil, take care not to
spill any. Oil must not be allowed to escape
into the soil or waterways. You would oth-
erwise be damaging the environment . Coolan
t G
Risk of injury
The cooling system is pressurised. There-
fore, only unscrew the cap once the engine
has cooled down. This means the coolant
temperature gauge must display less than
70 °C. You could otherwise be scalded by
escaping hot coolant.
Coolant consists of water and antifreeze/cor -
rosion inhibitor. Only check the coolant leve l
when the vehicle is on a level surface and th e
engine has cooled down. Checking the coolant level The expansion tank is located in the engin
e
compartment on the right-hand side of the
vehicle . 1
Cove r
2 Expansion tank
3 Marker bar
X Slowly turn cap 1by half a turn anti-clock -
wise to allow excess pressure to escape.
X Turn cap 1further anti-clockwise and
remove it.
There is sufficient coolant in expansion
tank 2if the coolant is level with marker
bar 3in the filler neck when cold or
approximately 1.5 cm higher when hot .
X Top up the coolant if necessary. Operation
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Display
messages 24
2 Display messages Possible cause/consequence Possible solution
Check brake
fluid level
G
Risk of accident
There is insufficient brake fluid in the
brake fluid reservoir. In addition, the
3 warning lamp in the instrument clus-
ter lights up and a warning tone sounds. X
Pull over as soon as it is safe to do so.
X Do not continue driving under any circumstan-
ces .
X Consult the nearest qualified specialist work -
shop.
X Do not top up the brake fluid. This will not rec -
tify the malfunction. P
Shift to
P P
Shift to
P You have switched off the engine with the
KEYLESS GO* button and opened the driv-
er's door.
You have attempted to lock the vehicle. X
Move the selector lever to P.
The engine can be started again. To start
engine, shift
to either P or
N To start engine,
shift to either
P
or N You have attempted to start the engin
e
while the selector lever is not in position
P or N. X
Move the selector lever to Por N. Clean the fuel
filter X
Visit a qualified specialist workshop. Practical advice
* optional
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Display
messages 24
4 Display messages Possible cause/consequence Possible solution
Run Flat Indi-
cator inopera-
tiv
e Run Flat Indicator
inoperative The tyre pressure loss warning system is
deactivated due to a malfunction. X
Have the tyre pressure loss warning system
checked at a qualified specialist workshop .Check tyres
Restart system Check tyre pres-
sures then restart
Run Flat Indicator There was a tyre pressure warning mes-
sage. X
Make sure that the pressure is correct for all
tyres (Y page 213).
X Then restart the tyre pressure loss warning
system (Y page 214). Key not detec-
ted
The KEYLESS GO* key cannot be detected
while the engine is running because it is
either not in the vehicle or because ther
e
is strong radio interference. In addition, a
warning tone sounds.
Once the engine has been switched off ,
you will no longer be able to lock the vehi-
cle centrally or start the engine. X
Stop the vehicle as soon as the traffic condi -
tions permit.
X Locate the KEYLESS GO* key or operate the
vehicle using the key in the ignition lock. Key not detec-
ted
The KEYLESS GO* key cannot be detec-
ted. X
Change the location of the KEYLESS GO key*
within the vehicle .
X Operate the vehicle using the key in the ignition
lock if necessary. Key does not
belong to vehi-
cle You have put the wrong key in the ignition
lock. X
Use the correct key. Practical advice
* optional
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Display
messages 25
2 Display messages Possible cause/consequence Possible solution
D 4-button multi-function
steering wheel:
Stop vehicl
e
Engine off
12-button luxury multi-
function steering
wheel:
Coolant Stop vehi-
cle Switch engine
off The poly-V-belt may have torn. A warning
tone also sounds. X
Stop the vehicle. Pay attention to the traffic
conditions as you do so.
X Switch off the engine.
X Check the poly-V-belt .
X If it is not damaged :do not start the engin e
again until the display message goes out. Ther e
is otherwise a risk of engine damage.
X If it has torn: do not drive on. Contact th e
nearest qualified specialist workshop .D The radiator's electric fan has failed. X
If the coolant temperature is less than 120 †
you can continue driving to the nearest quali-
fied specialist workshop .
X In doing so, avoid heavy loads on the engine
(e.g. driving in mountainous terrain) and stop-
and-go driving. H Top up coolant See
Owner's Manual The coolant level is too low. X
Top up the coolant, observing the warning
notes (Y page 209).
X Have the coolant system checked at a qualified
specialist workshop if the coolant needs top-
ping up more often than usual .Practical advice
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Display
messages 26
7 Display messages Possible cause/consequence Possible solution
. Switch off lights
or remove key The light switch is set to the
*position
or the daytime driving lights are switched
on and you have not removed the key. The
side lamps remain switched on. A warning
tone also sounds. X
Remove the key from the ignition lock.
or
X Turn the light switch to M. ò 4-button multi-function
steering wheel:
Replace air
cleane
r
12-button luxury multi-
function steering
wheel:
Replace air
cleane r The engine air filter must be replaced. X
Visit a qualified specialist workshop. N 4-button multi-function
steering wheel:
Check eng. oil
level
12-button luxury multi-
function steering
wheel:
Check eng. oil lev.
when next refuel
-
ling The engine oil level has dropped to a crit-
ical level. X
Check the engine oil level (Y page 208 )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 . Practical advice
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Troubleshooting
28
2 Problem Possible cause/consequence Suggested solutions
D
The red coolant warning
lamp lights up while the
engine is running. You will
also hear a warning tone. The coolant temperature has
exceeded 130
†. The engine is
not being cooled sufficiently and
may be damaged .
The coolant level may be too low. X
Stop the vehicle as soon as possible. Pay attention to the traffic
conditions as you do so.
X Allow the engine and coolant to cool.
X Check the coolant level. Observe the warning note s
( Y page 209). Top up the coolant if necessary.
X Have the coolant system checked at a qualified specialist work-
shop if the coolant needs topping up more often than usual .
If the coolant level is correct, the radiator fan may be faulty. In this
case:
X Do not continue driving under any circumstances .
X Consult a qualified specialist workshop. ±
The yellow engine diagnos-
tic warning lamp lights up
while the engine is run-
ning. Vehicles with a diesel engine: the
fuel tank has run dry. X
Start the engine three to four times after refuelling.
Emergency running mode is cancelled. The vehicle need not be
checked. Practical advice
204_AKB; 2; 3, en-G
B
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Troubleshooting
28
3 Problem Possible cause/consequence Suggested solutions
±
The yellow engine diagnos-
tic warning lamp lights up
while the engine is run-
ning. There may be a malfunction:
R
in the fuel injection system or
R in the exhaust system or
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. =
The red SRS warning lamp
lights up 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. <
The red seat belt warning
lamp lights up for 6 sec-
onds after the engine
starts up. 16 The seat belt warning lamp
reminds the driver and front
passenger to fasten their seat
belts. X
Fasten your seat belt (Y page 98). 16
Only for certain countries Practical advice
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Troubleshooting
29
1 Problem Possible cause/consequence Suggested solutions
Vehicles with a petrol engine:
The engine is not running
smoothly and is misfiring. The engine electronics or
a
mechanical component of the
engine control unit have been
damaged. X
Only depress the accelerator pedal slightly.
X Have the cause rectified immediately at a qualified specialist work-
shop .
Otherwise, non-combusted fuel may get into the catalytic converter
and damage it. A coolant temperature of over
120 °C is displayed. The coolant
warning lamp may also be on and
a warning signal may sound
(
Y page 123). The coolant level is too low. The
coolant is too hot and the engin
e
is no longer being cooled suffi-
ciently. X
Stop as soon as possible and allow the engine and the coolant to
cool down.
X Check the coolant level (Y page 209). Observe the warning notes
as you do so and top up the coolant if necessary. If the coolant level is correct, the
radiator fan may be faulty. The
coolant is too hot and the engin
e
is no longer being cooled suffi-
ciently. X
If the coolant temperature is less than 120°C, you can continue
driving to the nearest qualified specialist workshop.
X Avoid heavy loads on the engine as you do so, e.g. when driving on
mountain roads and stop/start driving . Practical advice
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