2008 MERCEDES-BENZ SL ROADSTER engine

Troubleshooting
240 Warnin
gtones Problem Possible cause/consequence Suggeste
dsolutions Th
ea nti-theft warning alar mis
triggered. Yo
uh aveo penedt he vehicle
using the emergency key element
without deactivating the anti-
theft alar msystemf irst. X
Switch off the alar m(Ypage 60). Yo
uh earaw arning tone. Am
essage appear sinthe multi-
functio ndisplay. X
See the explanations for the displa ymessage (Y page 202). Yo
uh earaw arning tone. Yo
ua redriving with the parking
brake applied. X
Releas ethe parking brake. Yo
uh earaw arning tone. Yo
ud idnot switch off the lights
when leaving the vehicle. X
Turn the ligh tswitch to MorU.
or
X If the rea rfoglamp is switched on: press the ligh tswitch in to the
stop. Yo
uh earaw arning tone. G
Ris
kofi njury
Th ed river or front passenge rhas
not fastened their seat belt. X
Faste nyours eatb elt( Ypage 83). Yo
uh earac ontinuous tone. Yo
uh aves witched off the engine
and opene dthe bonnet or the
driver's door with SBC Hol dacti-
vated. X
Deactivate SBC Hol d(Ypage 137). Practical advice
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Troubleshooting
241Accident
Problem Possible cause/consequence Suggeste
dsolutions Fuel is leaking fro
mthe vehicle. G
Ris
koff ire
Th ef uellin eort he fuel tank has
been damaged. Th elea king fuel
create sariskoff ireore xplosion. X
Switch off the ignition immediately.
X Remov ethe ignition key.
Do not restar tthe engine under any circumstances .The leaking fuel
create sariskoff ireore xplosion.
X Consult aqualified specialis tworkshop. Yo
ua reunabl etod etermine the
extent of the damage. X
Consult aqualified specialis tworkshop. Yo
uc annot detect any damage. X
Star tthe engine as normal. Practical advice
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Troubleshooting
242 Braking system
Problem Possible cause/consequence Suggeste
dsolutions Th
eb rake peda lresistanc eis
lowe rtha nu sual and the pedal
travel longer. G
Ris
kofa ccident
R Th eS BC®
brake syste misacti-
vated vi athe brake pedal.
R Yo uh avej usts tarted the
engine. X
Depres sthe brake peda lagain.
Th ep edal resistanc eand travel return to normal. Th
eb rake peda lresistanc eis
lowe rtha nu sual and the pedal
travel longer. G
Ris
kofa ccident
Th eS BC®
brake syste misrun-
ning in emergency mode. X
Observe the additional message sinthe multi-functio ndisplay
( Y page 202). Th
eb rake peda lpulsa tes. G
Ris
kofa ccident
Th eS BC®
brake syste mpump
runs whil ethe brake peda lis
depressed. Observe the SBC
®
message s(Ypage 57). Practical advice
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Troubleshooting
243Fuel and fue
ltank Problem Possible cause/consequence Suggeste
dsolutions Fuel is leaking fro
mthe vehicle. G
Ris
kofe xplosion or fire
Th ef uellin eort he fuel tank is
defective. X
Turn the key to position 0in the ignition lock immediatel yand
remove it.
X Do not restar tthe engine under any circumstances.
X Consult aqualified specialis tworkshop. Th
ef uelfiller flap cannot be
opened. Th
ef uelfiller flap is not released. X
Unlock the vehicl e(Ypage 255). Th
eo pening mechanis misjam-
med. X
Consult aqualified specialis tworkshop. Practical advice
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Troubleshooting
244 Engine
Problem Possible cause/consequence Suggeste
dsolutions Th
ee ngine will not start. SBC
®
HOL Disa ctivated. X
Deactivating SBC ®
HOL D(Ypage 137).
X Star tthe engine again. Th
ee ngine will not start. Yo ucan
hear the starter moto roperating. R
There is amalfunctio nint he
engine electronics.
R There is amalfunctio nint he
fuel supply. X
Turn the key back to position 0in the ignition lock befor ethe next
starting attempt.
X Try to start the engine agai n(Ypage 95) .Whend oing so ,remember
tha texcessivel ylon ga nd frequent attempts to start the engine will
drain the battery.
If the engine does not start after several attempts:
X Consult aqualified specialis tworkshop. Th
ee ngine will not start. Yo ucan-
not hear the starter moto roper-
ating. Th
eo n-board voltag eistoo low
because the starter battery is too
weak or discharged. X
Jump-start the vehicl e(Ypage 279).
If the engine does not start despite attempting to jump-star tit:
X Consult aqualified specialis tworkshop. Th
es tarter moto rwasexposed to
at herma lloa dt hatw astoo high. X
Allow the starter moto rtocooldow nfor approximately two
minutes.
X Try to start the engine again.
If the engine still does not start:
X Consult aqualified specialis tworkshop. Practical advice
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Troubleshooting
245Problem Possible cause/consequence Suggeste
dsolutions Th
ee ngine is not running
smoothly and is misfiring. There is
amalfunctio nint he
engine electronics or amechani-
cal component of the engine con-
trol unit. X
Onl ydepress the accelerator peda lsligh tly.
X Have the caus erectifie dimm ediatel yataq ualified specialis twork-
shop.
Otherwise, non-combuste dfue lm aygetinto the catalytic converter
and damage it. Ac
oolant temperatur eofover
120 °C is displayed. Th ecoolant
warning lamp ma yalsobeona nd
aw arning tone ma ysound
(Y page 106). Th
ec oolant level is too low. The
coolant is too ho tand the engine
is no longe rbeing coole dsuffi-
ciently. X
Stop as soon as possibl eand allo wthe engine and the coolant to
coo ldow n.
X Check the coolant level (Y page 180).Obser ve the warning notes
as yo udosoa nd top up the coolant if necessary. If the coolant level is correct, the
radiato
rfan ma ybef aulty.The
coolant is too ho tand the engine
is no longe rbeing coole dsuffi-
ciently. X
If the coolant temperatur eislesst han1 20 °C ,you can continue
driving to the neares tqualified specialis tworkshop.
X Avoi dheavy loadsont he engine as yo udoso,e.g .whend riving on
mountai nroads and stop/star tdriving. Practical advice
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Troubleshooting
246 Automatic transmission
Problem Possible cause/consequence Suggeste
dsolutions Th
et ransmission ha sproblems
shifting gear Th
et ransmission is losing oil. X
Have the transmission checked at aqualified specialis tworkshop
immediately. Th
ea cceleratio nability is deteri-
orating.
Th et ransmission no longer
change sgear. Th
et ransmission is in emergency
mode.
It is onl ypossibl etos hift into
2nd gear and revers egear. X
Stop the vehicle.
X Move the selector lever to P.
X Turn the key to position 0in the ignition lock.
X Wait at leas t10second sbefor er estarting the engine.
X Move the selector lever to position Dor R.
If D is selected ,the transmission shifts into 2ndgear;ifRis selec-
ted ,the transmission shifts into revers egear.
X Have the transmission checked at aqualified specialis tworkshop
immediately. Practical advice
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Troubleshooting
249Roof
Problem Possible cause/consequence Suggeste
dsolutions Th
er oofw illn ot open or close. Th
eb ootseparat or is not in place. X
Clos ethe boot separator. Th
eb ootlid is open. X
Clos ethe boot lid. Th
eo n-board voltag eistoo low. X
Let the engine run. Th
er oofw asopene dand closed
several times in succession. The
roo fdrive wa sautomatically
deactivated. Yo
uc an open or close the roo fagain after abou tten minutes.
X Switch the ignition off and the nonagain.
X Repeat the opening or closing procedure. Th
ea utomatic roo fmechanis mis
faulty. X
Consult aqualified specialis tworkshop. Practical advice
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