Honda VFR1200F Owner's Manual page 123

Exhaust Emission Control System
The exhaust emission control system includes
the following components that should not
need adjustment, although periodic inspection
by your Honda dealer is recommended.
❙ PGM-FI System
The PGM-FI (programmed fuel injection)
system uses sequential multiport fuel injection,
and is comprised of air intake, engine control,
fuel control, and exhaust control subsystems.
The engine control module (ECM) uses sensors
to determine how much air enters the engine,
and then controls how much fuel to inject.
❙ Ignition Timing Control System
The ignition timing control system adjusts the
ignition timing to reduce the amount of HC,
CO, and NOx produced.
Emission Control Systems
Secondary Air Injection System
❙
The secondary air injection system adds
filtered air into the exhaust gas to help improve
emission control performance.
Catalytic Converters
❙
The exhaust system contains one or more
catalytic converters. Catalytic converters use a
catalyst to convert most of the harmful
exhaust gas compounds into harmless
compounds.
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.
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