Honda ACCORD HYBRID 2005 Service Manual page 279

Exhaust Gas Recirculation (EGR) System
Refer to the System Diagram to see a functional layout
of the system.
EGR Valve
The EGR valve lowers peak c o m b u s t i o n temperatures
and reduces oxides of nitrogen emissions (NOx) by
recirculating exhaust gas t h r o u g h the intake manifold
and into the combustion chambers.
Positive Crankcase Ventilation (PCV) System
The PCV valve prevents blow-by gasses f r o m escaping
into the atmosphere by venting t h e m into the intake
m a n i f o l d .
PCV V A L V E
PCV V A L V E
BLOW-BY VAPOR
F R E S H AIR
Evaporative Emission (EVAP) Control
System
Refer to the System Diagram to see a functional layout
of the system.
EVAP Canister
The EVAP canister t e m p o r a r i l y stores fuel vapor f r o m
the fuel tank until it can be purged f r o m the EVAP
canister into the engine and burned.
EVAP Canister Purge Valve
W h e n the engine coolant temperature is b e l o w 140 °F
(60 °C), the PCM turns off the EVAP canister purge valve
w h i c h cuts v a c u u m to the EVAP canister.
Fuel Tank Pressure (FTP) Sensor
The FTP sensor converts fuel tank absolute pressure
into an electrical input to the PCM during the EVAP leak
check.
SENSOR UNIT
O-RING
EVAP Canister Vent Shut Valve
The EVAP canister vent shut valve is on the EVAP
canister.
The EVAP canister vent shut valve controls the venting
of the EVAP canister.
VALVE
(cont'd)
11-39