Emissions Controls (Petrol Models) - Honda Accord 4D 2003-2006 Owner's Manual

03/09/03 15:22:32 32SEA610_509

Emissions Controls (Petrol models)

On some models
The burning of petrol in your car's
engine produces several byproducts.
Some of these are carbon monoxide
(CO), oxides of nitrogen (NOx) and
hydrocarbons (HC). Petrol
evaporating from the tank also
produces hydrocarbons. Controlling
the production of NOx, CO, and HC
is important to the environment.
Under certain conditions of sunlight
and climate, NOx and HC react to
form photochemical ''smog.'' Carbon
monoxide does not contribute to
smog creation, but it is a poisonous
gas.
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Technical Information
Crankcase Emissions Control
System
Your car has a Positive Crankcase
Ventilation System. This keeps
gasses that build up in the engine's
crankcase from going into the
atmosphere. The Positive Crankcase
Ventilation valve routes them from
the crankcase back to the intake
manifold. They are then drawn into
the engine and burned.
Evaporative Emissions Control
System
As petrol evaporates in the fuel tank,
an evaporative emissions control
canister filled with charcoal adsorbs
the vapor. It is stored in this canister
while the engine is off. After the
engine is started and warmed up, the
vapor is drawn into the engine and
burned during driving.
Exhaust Emissions Controls
The exhaust emissions controls
include four systems: PGM-FI,
Ignition Timing Control, Exhaust
Gas Recirculation and Three Way
Catalytic Converter. These four
systems work together to control the
engine's combustion and minimize
the amount of HC, CO, and NOx that
comes out the tailpipe. The exhaust
emissions control systems are
separate from the crankcase and
evaporative emissions control
systems.