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174 Technical Information
Emission Control Systems
Source of Emission
The combustion process produces carbon
monoxide (CO), oxides of nitrogen (NOx), and
hydrocarbons (HC).
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 Motor Co., Ltd. utilizes various systems to
reduce carbon monoxide, oxides of nitrogen and
hydrocarbons.
Exhaust Emission Control System
The exhaust emission control system includes the
following components that should not need
adjustment, although periodic inspection by your
dealer is recommended.
PGM-FI System
The PGM-FI system has four subsystems: Air
Intake, Engine Control, Fuel Control, and Exhaust
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 is
injected under all operating conditions.
Ignition Timing Control System
The ignition timing control system adjusts the
ignition timing to reduce the amount of HC, CO,
and NOx produced.
Secondary Air Injection System
The exhaust emission control system consists of a
secondary air injection system.
The secondary air injection system introduces
filtered air into the exhaust gases in the exhaust
port. The secondary air injection system helps
improve emission control performance.
No adjustments to this system should be made
although periodic inspection of the components is
recommended.
Evaporative Emission Control System
An evaporative emissions control system uses a
canister filled with charcoal to adsorb fuel vapor
from the fuel tank while the engine is off. The
vapor is drawn into the engine and burned while
riding.
Models sold in and used in California:
An add-on or modified part must be compliant
with applicable ARB evaporative emission control
standards. A violation of this requirement is
punishable by civil and/or criminal punishment.
Crankcase Emission Control System
The engine is equipped with a closed crankcase
system to prevent discharging emissions into the
atmosphere. Blow-by gas is returned to
combustion chamber through the air cleaner
housing and throttle body.
Fuel Permeation Emission Control System
This vehicle complies with the Fuel Permeation
Emission Control regulations of the U.S.
Environmental Protection Agency (EPA) and the
California Air Resources Board (CARB).
The fuel tank, fuel hoses, and fuel vapor charge
hoses used on this vehicle incorporate fuel
permeation control technologies.
Tampering with the fuel tank, fuel hoses, or fuel
vapor charge hoses to reduce or defeat the
effectiveness of the fuel permeation technologies
is prohibited by federal regulations.
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