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Honda GL1800 GOLDWING 2009 Manual

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Technical Information
Emission Control Systems
PGM-FI System
Ignition Timing Control System
Secondary Air Injection System
Three-Way Catalytic Converters
Source of Exhaust Emissions
Exhaust Emission Control System
The PGM-FI system uses sequential multiport fuel injection. It 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 to inject under
all operating conditions.
The system constantly adjusts the ignition timing, reducing the amount of HC,
CO and NOx produced.
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.
The three-way catalytic converters are in the exhaust system. Through chemical
reactions, they convert HC, CO, and NOx in the engine’s exhaust to carbon
dioxide (CO ), nitrogen (N), and water vapor.
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.
The exhaust emission control system includes a PGM-FI system, two three-way
catalytic converters, a secondary air injection system, and two heated oxygen
sensors or two air fuel ratio sensors.
No adjustment to these systems should be made although periodic inspection of
the components is recommended.
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