Mercedes-Benz S 320 1999, Owner'S Manual

Page: 104 / 169

Emission Control
Certain systems of the engine
serve to keep the toxic com po­
nents of the exhaust gases within
permissible limits required by law.
These systems, of course, will
function properly only when
maintained strictly according to
factory specifications. Any adjust­
ments on the engine should,
therefore, be carried out only by
qualified Mercedes-Benz autho­
rized dealer technicians. Engine
adjustments should not be altered
in any way. Moreover, the specified
service jobs must be carried out
regularly according to Mercedes-
Benz servicing requirements. For
details refer to the Service Booklet.
Warning!
Inhalation of exhaust gas is
hazardous to your health. All
exhaust gas contains carbon
monoxide, and inhaling it can
cause unconsciousness and
lead to death.
Do not run the engine in con­
fined areas (such as a garage)
which are not properly venti­
lated. If you think that exhaust
gas fumes are entering the ve­
hicle while driving, have the
cause determined and cor­
rected immediately. If you
must drive under these condi­
tions, drive only with at least
one window fully open.
On-Board Diagnostic System
The Sequential Multiport Fuel
Injection (SFI) control module
monitors emission control com ­
ponents that either provide input
signals to or receive output signals
from the control module. Malfunc­
tions resulting from interruptions or
failure of any of these components
are indicated by the “CHECK
ENGINE” malfunction indicator
lamp in the instrument cluster and
are simultaneously stored in the
SFI control unit.
If the “CHECK ENGINE” m alfunc­
tion indicator lamp comes on, have
the system checked at your autho­
rized Mercedes-Benz dealer as
soon as possible.
The control module switches off
the “CHECK ENGINE” indicator
lamp if the condition, causing the
lamp to come on, no longer exists.
An on-board diagnostic connector
is located in the passenger com ­
partment near to the parking brake
pedal, allowing the accurate iden­
tification of system malfunctions
through the readout of diagnostic
trouble codes.
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