Acura NSX 1997 Service Manual page 274

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Evaporative Emission (EVAP) Controls
Description
The evaporative emission controls are designed to minimize the amount of fuel vapor escaping to the atmosphere. The
system consists of the following components:
A. Evaporative Emission (EVAP) Control Canister
An EVAP control canister is used for the temporary storage of fuel vapor until the fuel vapor can be purged from the
EVAP control canister into the engine and burned.
B. Vapor Purge Control System
EVAP control canister purging is accomplished by drawing fresh air through the EVAP control canister and into a port
on the throttle body. The purging vacuum is controlled by the EVAP purge control solenoid valve.
C. Fuel Tank Vapor Control System
When fuel vapor pressure in the fuel tank is higher than the set value of the EVAP two way valve, the valve opens and
regulates the flow of fuel vapor to the EVAP control canister.
FUEL FILL
CAP
FUEL TANK
EVAP VALVE
FUEL
TANK
PRESSURE
SENSOR
Table of Contents
EVAP
BYPASS
SOLENOID
VALVE
EVAP EVAP CONTROL
TWO WAY CANISTER
VALVE
From No. 5 BACK-UP
LIGHTS ALTERNATOR
TURN SIGNALS (15 A)
FUSE
EVAP CONTROL
CANISTER
VENT SHUT VALVE
EVAP PURGE
CONTROL
SOLENOID VALVE
VARIOUS
SENSORS
(cont'd)