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This system constantly adjusts the
ignition timing, reducing the amount
of HC, CO, and NOx produced.
The exhaust emissions controls
include four systems: PGM-FI,
Ignition Timing Control, Secondary
Air Injection System, 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.
During engine warm-up, air is
pumped into the exhaust to reduce
emissions when the engine is cold.
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 ), dinitrogen
(N ), and water vapor.
The emissions control systems are
designed and certified to work to-
gether in reducing emissions to
levels that comply with the Clean Air
Act. To make sure the emissions
remain low, you should use only new
Genuine Honda replacement parts or
their equivalent for repairs. Using
lowerqualitypartsmayincreasethe
emissions from your car.
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 emissions control systems are
covered by warranties separate from
the rest of your car. Read your
warranty manual for more informa-
tion.
The Onboard Refueling Vapor
Recovery (ORVR) system captures
the fuel vapors during refueling. The
vapors are adsorbed in a canister
filled with activated carbon. While
driving, the fuel vapors are drawn
into the engine and burned off.
2
2
Exhaust Emissions Controls Replacement Parts
Onboard Refueling Vapor
Recovery
PGM-FI System
Ignition Timing Control System
Secondary Air Injection System
Three Way Catalytic Converter
Emissions Controls
Technical Information
258
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