Honda INTERCEPTOR 2002 Service Manual page 46

GENERAL INFORMATION
EXHAUST EMISSION CONTROL SYSTEM (SECONDARY AIR SUPPLY SYSTEM )
The exhaust emission control system uses a lean fuel injection setting, and no adjustments should be made except idle
speed adjustment with the throttle stop screw. The exhaust emission control system is separate from the crank case
emission control system.
The exhaust emission control system includes of a secondary air supply system which introduces filtered air into the
exhaust gases in the exhaust port. Fresh air is drawn into the exhaust port by the function of the PAIR (Pulse Secondary Air
Injection) control valve.
This charge of f resh air promotes burning of the unburned exhaust gases and changes a considerable amount of
hydrocarbons and carbon monoxide into relatively harmless carbon d ioxide and water vapor.
The reed valve prevents reverse air flow through the system. The PAIR control valve is operated by the solenoid valve. The
solenoid valve is controlled by the PGM -FI unit, and the fresh air passage is opened/closed according the running condition
(ECT/IAT/TP/MAP sensor and engine revolution).
No adjustments to t he secondary air supply system should be made, although periodic inspection of the components is
recommended.
AIR CLEANER HOUSING
THROTILE BODY
PAIR CHECK VALVE
EXHAUST PORT
~~~~~
EXHAUST GAS
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FRESH AIR
This motorcycle is also equipped with two three-way catalytic converters, and two heated oxygen sensors.
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 (C02). dinitrogen (N2), and water vapor.
No adjustment to these systems should be made although periodic inspection of the components is recommended.
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