Honda FSC600D/A 2005 SILVER WING Owner's Manual page 213

Emission Control Systems
Exhaust Emission Control System
The exhaust emission control system
includes a secondary air supply system, a
PGM-FI system, and an oxidation catalytic
converter.
No adjustment to these systems should be
made although periodic inspection of the
components is recommended.
204
Technical Information
PGM-FI 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.
Ignition Timing Control System
The system constantly adjusts the ignition
timing, reducing the amount of HC, CO
and NOx produced.