user manual

105
Emission Control System
Information
TECHNICAL INFORMATION
Ignition Timing Control System
Source of Emissions
PGM-FI System
The U.S., Calif ornia Clean Air
Acts, and Environment Canada
EPA, California, and Canadian
regulations require all manufacturers
to furnish written instructions
describing the operation and
maintenance of emission control
systems.
The system constantly adjusts the
ignition timing, reducing the amount
of HC, CO, and NOx produced.
The combustion process produces
carbon monoxide, oxides of nitrogen,
and hydrocarbons. Control of
hydrocarbons and oxides of nitrogen
is very important because, under
certain conditions, they react to form
photochemical smog when subjected
to sunlight. Carbon monoxide does
not react in the same way, but it is
toxic.
Honda utilizes appropriate air/fuel
ratios and other emissions control
systems to reduce the emissions of
carbon monoxide, oxides of nitrogen,
and hydrocarbons.
The PGM-FI system uses sequential
multiport fuel injection. It has three
subsystems: Air Intake, Engine
Control, and Fuel Control. The
Engine Control Module (ECM) uses
various sensors to determine how
much air is going into the engine. It
then controls how much fuel to inject
under all operating conditions.
The following instructions and
procedures must be followed in order
to keep the emissions from your
Honda engine within the emission
standards.
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