2004 MERCEDES-BENZ CLK55AMG CABRIOLET check engine

166 Controls in detailAutomatic transmissionEmergency operation (Limp Home Mode)
If vehicle acceleration worsens or the
transmission no longer shifts, the trans-
mission is most likely operating in limp
home (emergency operation) mode. In this
mode, only second gear and reverse gear
can be activated.
Stop the vehicle.

Move gear selector lever toP.

Turn off the engine.

Wait at least ten seconds before
restarting.

Restart the engine.

Move gear selector lever to positionD
(for second gear) orR.

Have the transmission checked at an
authorized Mercedes-Benz Center as
soon as possible.

181 Controls in detail
Automatic climate control
Air conditioning
The air conditioning is operational while
the engine is running and cools the interior
air to the temperature set by the operator.
Deactivating
It is possible to deactivate the air condi-
tioning (cooling) function of the automatic
climate control system. The air in the vehi-
cle will then no longer be cooled or dehu-
midified.
Press button° (
page 173).
The indicator lamp on the button°
comes on.Activating
Moist air can fog up the windows. You can
dehumidify the air with the air condition-
ing.

Press° again (
page 173).
The indicator lamp on the button°
goes out.
The air conditioning system uses the refrig-
erant R134a. This refrigerant is free of
CFCs which are harmful to the ozone layer.
Residual heat and ventilation*
With the engine switched off, it is possible
to continue to heat or ventilate the interior
for up to 30 minutes. This feature makes
use of the residual heat produced by the
engine.
Activating
Turn the SmartKey in the starter switch
to position1 or0, or remove it from
the starter switch.

Press button° (
page 173).
The indicator lamp on button°
comes on.
iCondensation may drip out from under-
neath the vehicle. This is normal and
not an indication of a malfunction.
!If the° button on the automatic cli-
mate control panel starts to flash, this
indicates that the air conditioning sys-
tem is losing refrigerant. The compres-
sor has turned itself off. The air
conditioning cannot be turned on
again.
Have the air conditioning system
checked at the nearest authorized
Mercedes-Benz Center.

286 OperationAt the gas stationCheck regularly and before a long trip
1Coolant level
More information on coolant can be
found in the “Operation” section on
(
page 292).
2Brake fluid (fuse box cover removed)
Removing fuse box cover (
page 395)
3Windshield washer and headlamp
cleaning system
More information on refilling the reser-
voir can be found in the “Operation”
section on (
page 295).Engine oil level
More information on engine oil
(
page 288).
Opening hood (
page 287).
Vehicle lighting
Check function and cleanliness.For more
information on replacing light bulbs, see
“Replacing bulbs” (page 372).
Exterior lamp switch (page 47)
Tire inflation pressure
More information on tire inflate pressure
(
page 298).
!If you find that the brake fluid in the
brake fluid reservoir has fallen to the
minimum mark or below, have the
brake system checked for brake pad
thickness and leaks immediately. Noti-
fy an authorized Mercedes-Benz Center
immediately. Do not add brake fluid as
this will not solve the problem. For
more information, see also “Practical
hints” (
page 313).

288 OperationEngine compartment
Closing
Let the hood drop from a height of ap-
proximately 1 ft (30 cm).
The hood will lock audibly.

Make sure the hood is fully closed.
If you can raise the hood at a point
above the headlamps, then it is not
properly closed. Open it again and let it
drop with somewhat greater force.
Engine oil
The amount of oil your engine needs will
depend on a number of factors, including
driving style. Higher oil consumption can
occur when

the vehicle is new


the vehicle is driven frequently at high-
er engine speeds
Engine oil consumption checks should only
be made after the vehicle break-in period.
Warning!
G
If you see flames or smoke coming from the
engine compartment, or if the coolant tem-
perature gauge indicates that the engine is
overheated, do not open the hood. Move
away from the vehicle and do not open the
hood until the engine has cooled. If neces-
sary, call the fire department.Warning!
G
The engine is equipped with a transistorized
ignition system. Because of the high voltage
it is dangerous to touch any components (ig-
nition coils, spark plug sockets, diagnostic
socket) of the ignition system

with the engine running


while starting the engine


if ignition is “on” and the engine is
turned manually
Warning!
G
Be careful that you do not close the hood on
anyone.
iDo not use any special lubricant addi-
tives, as these may damage the drive
assemblies. Using special additives not
approved by Mercedes-Benz will
restrict your warranty entitlement.
More information on this subject is
available at any Mercedes-Benz
Center.


289 Operation
Engine compartment
Checking engine oil level with the con-
trol system
When checking the oil level the vehicle
must

be parked on level ground


be at normal operating temperature


have been stationary for at least five
minutes with the engine turned off
To check the engine oil level via the
multifunction display, do the following:

Turn the SmartKey in the starter switch
to position2 or press the
KEYLESS GO* start/stop button twice.The standard display (
page 129) should
appear in the multifunction display.

Press buttonk or j on the
steering wheel until the following
message is seen in the multifunction
display:Engine oil level
Measuring now!
Measurement
correct
only if veh. levelOne of the following messages will
subsequently appear in the indicator:

Engine oil level
ok


Add 1.0 qt.
to reach max. oil level!(Canada:
1.0 liter
)


Add 1.5 qt.
to reach max. oil level!(Canada:
1.5 liter
)


Add 2.0 qt.
to reach max. oil level!(Canada:
2.0 liter
)

If necessary, add engine oil.
For adding engine oil see (
page 291).
More information on engine oil can be
found in the “Technical data” section
(
page 410) and (
page 412).
iIf you want to interrupt the checking
procedure, press thek orj
button on the multifunction steering
wheel.

290 OperationEngine compartmentOther display messages
If the SmartKey is not turned to position2
in the starter switch, the following
message will appear:Turn on ignition
to see engine oil level!
Switch on the ignition.
If you see the message:
Observe waiting time
If engine is at normal operating
temperature, wait five minutes before
repeating check procedure.

If engine is not yet at normal operating
temperature, wait 30 minutes before
repeating check procedure.If you see the message:
Engine oil level
Not when engine on!
Turn off the engine.

If the engine is at normal operating
temperature, wait five minutes before
checking oil.

If the engine is not yet at normal
operating temperature, you must wait
30 minutes before checking oil.
If there is excess engine oil with the engine
at normal operating temperature, the
following message will appear:
Engine oil level
Reduce oil level
!

Have excess oil siphoned or drained
off. Contact your authorized
Mercedes-Benz Center.More information on messages in the
display concerning engine oil can be found
in the “Practical hints” section
(
page 332). !Excess oil must be siphoned or drained
off. It could cause damage to the
engine and catalytic converter not
covered by the Mercedes-Benz Limited
Warranty.

291 Operation
Engine compartment
Adding engine oil
1Filler cap

Unscrew filler cap1 from filler neck.
Be careful not to overfill with oil.

Add engine oil as required. Be careful
not to overfill with oil.
Be careful not to spill any oil when adding.
Avoid environmental damage caused by oil
entering the ground or water.

Screw filler cap1 back on filler neck.
Transmission fluid level
The transmission fluid level does not need
to be checked. If you notice transmission
fluid loss or gear shifting malfunctions,
have an authorized Mercedes-Benz Center
check the automatic transmission.
!Only use approved engine oils. For a
listing of a approved engine oils, refer
to the Factory Approved Service Prod-
u c t s p a m p hl e t i n y o u r v e h i c l e l i t e r a t u r e
portfolio.
In addition, check the oil filler cap for
important information pertaining to the
engine oil needing to meet a specific
Mercedes-Benz specification (e.g. MB
229.5). If such information is printed
on the oil filler cap, only use an engine
oil from the list of approved engine oils
in the Factory Approved Service Prod-
ucts pamphlet that meets the specifi-
cation indicated on the oil filler cap.
Using engine oils of other specification
may cause the FSS to incorrectly deter-
mine the next service interval and will
result in engine damage not covered by
the Mercedes-Benz Limited Warranty.
!Excess oil must be siphoned or drained
off. It could cause damage to the en-
gine and catalytic converter not cov-
ered by the Mercedes-Benz Limited
Warranty.

292 OperationEngine compartmentCoolant
The engine coolant is a mixture of water
and anticorrosion/antifreeze. To check
the coolant level, the vehicle must be
parked on level ground and the engine
must be cool.
The coolant expansion tank is located on
the passenger side of the engine compart-
ment.
1Coolant expansion tank

Using a rag, turn the cap slowly approx-
imately one half turn to the left to re-
lease any excess pressure.

Continue turning the cap to the left and
remove it.
Warning!
G
In order to avoid any possibly serious burns:

Use extreme caution when opening the
hood if there are any signs of steam or
coolant leaking from the cooling system,
or if the coolant temperature gauge indi-
cates that the coolant is overheated.


Do not remove pressure cap on coolant
reservoir if engine temperature is above
194°F (90°C). Allow engine to cool
down before removing cap. The coolant
reservoir contains hot fluid and is under
pressure.


Using a rag, slowly open the cap approx-
imately
1⁄2 turn to relieve excess pres-
sure. If opened immediately, scalding
hot fluid and steam will be blown out un-
der pressure.


Do not spill antifreeze on hot engine
parts. Antifreeze contains ethylene gly-
col which may burn if it comes into con-
tact with hot engine parts.