Emission Control; On-Board Diagnostic System - Mercedes-Benz E320 Operator's Manual

Emission Control

Certain systems of the engine serve to
keep the toxic components 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 adjustments on the engine should,
therefore, be carried out only by
qualified Mercedes-Benz authorized
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 confined
areas (such as a garage) which are
not properly ventilated. If you think
that exhaust gas fumes are entering
the vehicle while driving, have the
cause determined and corrected
immediately. If you must drive
under these conditions, drive only
with at least one window fully open.

On-Board Diagnostic System

Vehicles with Diesel engine
When the "CHECK ENGINE" mal-
function indicator lamp comes on while
the engine is running, this indicates a
malfunction in the fuel injection system.
Only partial engine output is available.
Have the system checked at your
authorized Mercedes-Benz dealer as
soon as possible.
Vehicles with gasoline engine
The Sequential Multiport Fuel
Injection (SFI) control module
monitors emission control components
that either provide input signals to or
receive output signals from the control
module. Malfunctions 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
diagnostic module.
If the "CHECK ENGINE" malfunction
indicator lamp comes on, have the
system checked at your authorized
Mercedes-Benz dealer as soon as
possible.
An on-board diagnostic connector is
located in the passenger compartment
near to the parking brake pedal,
allowing the accurate identification of
system malfunctions through the
readout of diagnostic trouble codes.
90