Catalytic Converter System; Positive Crankcase Ventilation (Pcv) System - Honda Civic 2002-2003 Service Manual

Fuel and Emissions Systems
System Descriptions (cont'd)
Catalytic Converter System
Three Way Catalytic Converter (TWC)
The TWC converts hydrocarbons (HC), carbon
monoxide (CO), and oxides of nitrogen (NOx) in the
exhaust gas to carbon dioxide (C02). dinitrogen (N2),
and water vapor.
11-34
FRONT OF
VEHICLE
HOUSING
THREE WAY
CATALYST
Positive Crankcase Ventilation (PCV) System
The PCV valve prevents blow-by gasses from escaping
into the atmosphere by venting them into the intake
manifold.
BREATHER PIPE
rr=-'===~=;'/
PCV
HOSE
. . : BLOW-BY VAPOR
¢::l: FRESH AIR