Emissions Controls - Honda Accord Wagon 1995 Owner's Manual

Crankcase Emissions
Control System
Your car has a Positive
Crankcase Ventilation (PCV)
System. This keeps gasses that
build up in the engine's
crankcase from going into the
atmosphere. The PCV 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 fuel 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 three systems: PGM-FI,
ignition timing control, and
three-way catalytic converter.
These three 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.
PGM-FI System
The PGM-FI system uses a
sequential multiport fuel
injection. It has three
sub-systems: 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

Emissions Controls

how much fuel to inject under all
operating conditions.
Ignition Timing Control System
This system constantly adjusts
the ignition timing, reducing the
amount of HC, CO and NOx
produced.
Three-Way Catalytic Converter
The three-way catalytic
converter is in the exhaust
system. Through chemical
reactions, it converts HC, CO,
and NOx in the engine's exhaust
to carbon dioxide (CO
2
dinitrogen (N ), and water vapor.
2
Technical Information
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