2006 MERCEDES-BENZ CLK COUPE check engine

179 Controls in detail
Automatic transmission
Downshifting
Briefly press the inside1 of one of the
buttons on the back of the steering
wheel.
The transmission will shift to the next
lower gear as permitted by the shift
program. This action simultaneously limits
the gear range of the transmission
(
page 175).
Upshifting

Briefly press the outside2 of one of
the buttons on the back of the steering
wheel.The transmission will shift to the next
higher gear as permitted by the shift
program.This action simultaneously
extends the gear range of the transmis-
sion.
Canceling gear range limit

Press and hold the outside2 of one of
the buttons on the back of the steering
wheel until
D reappears in the multi-
function display.
The transmission will shift from the current
gear range directly to gear rangeD.
Shifting into optimal gear range

Press and hold the inside1 of one of
the buttons on the back of the steering
wheel.
The transmission will automatically select
the gear range suited for optimal
acceleration and deceleration. This may
involve shifting down one or more gears.Emergency operation
(Limp-Home Mode)
If vehicle acceleration becomes less re-
sponsive, sluggish, or the transmission no
longer shifts, the transmission is most like-
ly operating in limp-home (emergency op-
eration) mode. In this mode only second
gear and reverse gear can be selected.
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.
Warning!
G
On slippery road surfaces, never downshift
in order to obtain braking action. This could
result in drive wheel slip and reduced
vehicle control. Your vehicle’s ABS will not
prevent this type of loss of control.

194 Controls in detailClimate control (CLK 350)Air conditioning
The cooling function, is only operational
when the engine is running, cools the vehi-
cle interior down to the selected tempera-
ture. The cooling function also
dehumidifies the air in the vehicle interior,
thus preventing the windows from fogging
up.Deactivating
It is possible to deactivate the air condi-
tioning (cooling) function of the climate
control system. The air in the vehicle will
then no longer be cooled or dehumidified.

Press button2(
page 187).
The indicator lamp on the button goes
out.
The cooling function switches off after
a short delay.Activating
Moist air can fog up the windows. You can
dehumidify the air with the air condition-
ing.

Press button2(
page 187) again.
The indicator lamp on the button
comes on.
The air conditioning uses the
refrigerant R134a. This refrigerant is free
of CFCs which are harmful to the ozone
layer.
iCondensation may drip out from under-
neath the vehicle. This is normal and
not an indication of a malfunction.Warning!
G
If you turn off the cooling function, the
vehicle will not be cooled when weather
conditions are warm. The windows can fog
up more quickly. Window fogging may
impair visibility and endanger you and
others.
!If the air conditioning cannot be turned
on again, this indicates that the air
conditioning is losing refrigerant. The
compressor has turned itself off.
Have the air conditioning checked at
the nearest authorized Mercedes-Benz
Center.

206 Controls in detailAutomatic climate control (CLK 500)Air conditioning
The cooling function, only operational
when the engine is running, cools the vehi-
cle interior down to the selected tempera-
ture. The cooling function also
dehumidifies the air in the vehicle interior,
thus preventing the windows from fogging
up.Deactivating
It is possible to deactivate the air condi-
tioning (cooling) function of the automatic
climate control system. The air in the
vehicle will then no longer be cooled or
dehumidified.

Press button2or9
(page 197).
The indicator lamp on the button goes
out.
The cooling function switches off after
a short delay.Activating
Moist air can fog up the windows. You can
dehumidify the air with the air condi-
tioning.

Press button2or9
(page 197) again.
The indicator lamp on the button
comes on.
The air conditioning uses the refrigerant
R134a. This refrigerant is free of CFCs
which are harmful to the ozone layer.
iCondensation may drip out from under-
neath the vehicle. This is normal and
not an indication of a malfunction.Warning!
G
If you turn off the cooling function, the
vehicle will not be cooled when weather
conditions are warm. The windows can fog
up more quickly. Window fogging may
impair visibility and endanger you and
others.
!If the air conditioning cannot be turned
on again, this indicates that the air
conditioning is losing refrigerant. The
compressor has turned itself off.
Have the air conditioning checked at
the nearest authorized Mercedes-Benz
Center.

307 Operation
At the gas station
Check regularly and before a long tripEngine compartment (CLK 500, example)1Coolant level
2Brake fluid (fuse box cover removed)
3Windshield washer and headlamp
cleaning system*Coolant
For normal replenishing, use water (pota-
ble water quality). For more information,
see “Coolant” (
page 314) and see “Fu-
els, coolants, lubricants, etc.”
(
page 452).
Brake fluid
Removing fuse box cover,
see (page 437).Windshield washer and headlamp
cleaning system*
For more information on filling up the
washer reservoir, see “Windshield washer
system and headlamp cleaning system*”
(
page 316).
Engine oil level
For more information on engine oil, see
“Engine oil” (
page 309).
Vehicle lighting
Check function and cleanliness. For more
information on replacing light bulbs, see
“Replacing bulbs” (
page 412).
For more information, see “Exterior lamp
switch” (
page 52).
Tire inflation pressure
For more information, see “Checking tire
inflation pressure” (
page 328).
iOpening the hood, see (
page 308).
!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.
Notify an authorized Mercedes-Benz
Center immediately. Do not add brake
fluid as this will not solve the problem.
For more information, see also “Practi-
cal hints” (
page 361).

309 Operation
Engine compartment
Closing
Let the hood drop from a height of
approximately 1 ft (30 cm).
The hood will lock audibly.

Check to 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
higher 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 indicator indicates that the engine
is overheated, do not open the hood. Move
away from vehicle and do not open the hood
until the engine has cooled. If necessary,
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
(ignition coils, spark plug sockets, diagnos-
tic socket) of the ignition system

with the engine running


while starting the engine


if the 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 may
cause damage not covered by the
Mercedes-Benz Limited Warranty.
More information on this subject is
available at any Mercedes-Benz
Center.

310 OperationEngine compartmentChecking engine oil level with the con-
trol system, CLK 500
When checking the oil level

the vehicle must be parked on level
ground


with the engine at operating tempera-
ture, the vehicle must have been
stationary for at least 5 minutes with
the engine turned off


with the engine not at operating tem-
perature yet, the vehicle must have
been stationary for at least 30 minutes
with the engine turned off
To check the engine oil level via the
multifunction display, do the following:

Switch on the ignition (
page 36).
The standard display (
page 148) should
appear in the multifunction display.

Press buttonk or j on the mul-
tifunction steering wheel until the fol-
lowing message is seen in the
multifunction display:One of the following messages will
subsequently appear in the multifunc-
tion display:


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 312).
For more information on engine oil, see the
“Technical data” section (
page 452) and
(
page 454).
Other 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 (
page 36).
iIf you want to interrupt the checking
procedure, press thek orj
button on the multifunction steering
wheel.

311 Operation
Engine compartment
If you see the message:Observe waiting time
If engine is at operating temperature,
wait 5 minutes before repeating check
procedure.

If engine is not at operating
temperature yet, 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 operating
temperature, wait 5 minutes before
checking oil.

If the engine is not at operating
temperature yet, you must wait
30 minutes before checking oil.If there is excess engine oil with the engine
at operating temperature, the following
message will appear:
Engine oil level
Reduce oil level
Have excess oil siphoned or drained
off. Contact an authorized
Mercedes-Benz Center.
For more information on messages in the
multifunction display concerning engine
oil, see the “Practical hints” section
(
page 388).Checking engine oil level with the oil
dipstick, CLK 350
When checking the oil level


the vehicle must be parked on level
ground.


with the engine at operating tempera-
ture yet, the vehicle must have been
stationary for at least 5 minutes with
the engine turned off.


with the engine not at operating tem-
perature, the vehicle must have been
stationary for at least 30 minutes with
the engine turned off.
!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.

312 OperationEngine compartment1Oil dipstick
2Upper (max) mark
3Lower (min) mark
To check the engine oil level with the oil
dipstick, do the following:
Open the hood (
page 308).

Pull out oil dipstick1.

Wipe oil dipstick1 clean.

Fully insert oil dipstick1 into the
dipstick guide tube.

Pull out oil dipstick1 again after
approximately 3 seconds to obtain ac-
curate reading.
The oil level is correct when it is be-
tween the lower (min) mark3 and
upper (max) mark2 of oil dipstick1.

If necessary, add engine oil.
For adding engine oil, see “Adding en-
gine oil” (
page 312).
For more information on engine oil, see
“Fuels, coolants, lubricants, etc.”
(
page 452).
For more information on messages in the
multifunction display concerning engine
oil, see the “Practical hints” section
(page 388).Adding engine oiliThe filling quantity between the upper
and lower marks on the oil dipstick is
approximately 2.1 US qt. (2.0 l).
!Only use approved engine oils and oil
filters required for vehicles with
Maintenance System (U.S. vehicles) or
FSS (Canada vehicles). For a listing of
approved engine oils and oil filters,
refer to the Factory Approved Service
Products pamphlet in your vehicle
literature portfolio, or contact an
authorized Mercedes-Benz Center.
Using engine oils and oil filters of
specification other than those
expressly required for the Maintenance
System (U.S. vehicles) or FSS (Canada
vehicles), or changing of oil and oil filter
at change intervals longer than those
called for by the Maintenance System
(U.S. vehicles) or FSS (Canada vehi-
cles) will result in engine damage not
covered by the Mercedes-Benz Limited
Warranty.