The exhaust emissions controls
include four systems: PGM-FI,
ignition timing control, exhaust gas
recirculation and three way cat alytic
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
emission s control systems are
separate from the crankcase and
evaporative emissions control
systems.
The PGM-FI system uses sequential
multiport fuel injection. It has three
subsystems: air intake, engine
control, and fuel control. The
powertrain control module (PCM) in
automatic transmission vehicles or
the engine control module (ECM) in
manual transmission vehicles 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 vehicle. Read your
warranty manual for more informa-
tion.
This system constantly adjusts the
ignition timing, reducing the amount
of HC, CO, and NOx produced.
The three way ca talytic converter is
in the exhaust system. Through
chemical reactions, it converts HC,
CO, and NOx in the engine’s exhaust
to carbon dioxide (CO ), nitrogen
(N ), and water vapor.
The emissions control systems are
designed and certified to work
together in reducing emissions to
levels that comply with the Clean Air
Act. T o make sure the emissions
remain low, you should use only new
Acura replacement parts or their
equivalent for repairs. Using lower
qualitypartsmayincreasethe
emissions from your vehicle.
2
2
Emissions Controls
Exhaust Emissions Controls Replacement Parts
PGM-FI System
Ignition Timing Control System
Three Way Catalytic Converter
Technical Information
269
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