2008 MERCEDES-BENZ SL ROADSTER check engine

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
230_AKB; 5; 4, en-GB
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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
252 Problem Possible cause/consequence Suggeste
dsolutions Th
ek ey cannot be turned in the
ignition lock. Th
ek ey ha sbeeninp osition0for
ac onsiderabl etime. X
Remov ethe key and reinsert it into the ignition lock.
X Check the starter battery and recharge it if necessary
(Y page 276).
X Star tthe engine. Th
eo n-board voltag eistoo low. X
Switch off non-essentia lconsumers ,e.g.s ea th eating* or interior
lighting ,and try to tur nthe key again.
If thi sdoesn ot work:
X Check the starter battery and recharge it if necessary
(Y page 276).
or
X Jump-start the vehicl e(Ypage 279).
or
X Consult aqualified specialis tworkshop. Practical advice
*optional
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Towin
gand tow-starting 280
X
Connect negative terminal 3of the donor
battery to negative terminal 4of your
vehicle' sbattery using the jum plead, con-
necting the jum pleadtot he donor battery
first.
X Star tthe engine.
X Electrical consumers can be switched on
again. Do not switch the lights on, however,
as thi swillo verloa dthe battery.
X Remov ethe jum pleadf rome arth
point 4and negative terminal 3first,
the nfromp ositivet erminals 1and 2,
each tim edisconnecting fro mthe battery
on your ow nvehicl efirst.
X Have the battery checked at aqualified
specialis tworkshop ,e.g.aM ercedes-Benz
Service Centre. Towin
gand tow-starting Points to remember
G
Ris
kofa ccident
If yo utow the vehicle, yo umustu se arigid
towing ba rif:
R the engine is not running
R there is abrake syste mmalfunction
R the voltag esuppl yort he vehicle' selec-
trica lsystemisd amaged
Th ee lectric powe rsteering and the brake
force booster do not work when the engine
is not running .Greate rbraking force will
the nberequired and the brake peda ltravel
will be longer. If necessary ,depress the
brake peda lwithm aximum force.
Do not tow the vehicl eifthe key cannot be
turned in the ignition lock. If thi sisthe case,
the steering is locked and the vehicl ecan-
not be steered.
If yo utow or tow-start anothe rvehicle, its
weight must not exceed the maximum per-
missibl egross vehicl eweigh tofy ourv ehi-
cle. G
Ris
kofa ccident
Th eS BC®
brake syste mrequires electrical
power. Th eSBC®
brake syste menters
emergency mod eifthere ar efaults in the
powe rsuppl yort he vehicle' selectrica lsys-
tem. Greater braking force will the nbe
required and the brake peda ltravel and
braking distance will be longer. If neces-
sary ,depress the brake peda lwithm axi-
mu mf orce.
Th ev ehicl eisb raked if SBC ®
HOL Disa cti-
vated .The refore, deactivate SBC ®
HOL Dif
the vehicl eistobet owed.
If yo utow or tow-start anothe rvehicle, its
weight must not exceed the maximum per-
missibl egross vehicl eweigh tofy ourv ehi-
cle.
It is better to have the vehicl etransported
tha ntoh aveitt owed.
When towing ,obser ve the lega lrequirements
in al lcountries concerned.
! When towing ,pulla wa yslowl yand with-
ou tjerking. If the tractiv epower is too high,
the vehicles could be damaged. Do not use
the towing ey efor recovery. Practical advice
230_AKB; 5; 4, en-GB
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