HONDA 2014 Ridgeline - Owner's Manual - Manual (Page 400)

The burning of gasoline in your
vehicle’s engine produces several by-
products. Some of these are carbon
monoxide (CO), oxides of nitrogen
(NOx), and hydrocarbons (HC).
Gasoline evaporating from the tank
also produces hydrocarbons. Con-
trolling the production of NOx, CO,
and HC is important to the environ-
ment. Under certain conditions of
sunlight and climate, NOx and HC
react to form photochemical ‘‘smog.’’
Carbon monoxide does not contri-
bute to smog creation, but it is a
poisonous gas.
The United States Clean Air Act
sets standards for automobile
emissions. It also requires that
automobile manufacturers
explain to owners how their
emissions controls work and what
to do to maintain them. This
section summarizes how the
emissions controls work. Scheduled
maintenance is on page
.
Your vehicle has a positive
crankcase ventilation system. This
keeps gasses that build up in the
engine’s crankcase from going into
the atmosphere. The positive
crankcase ventilation valve routes
them from the crankcase back to the
intake manifold. They are then
drawn into the engine and burned.
As gasoline evaporates in the fuel
tank, an evaporative emissions
control canister filled with charcoal
adsorbs the vapor. It is stored in this
canister while the engine is off. After
the engine is started and warmed up,
the vapor is drawn into the engine
and burned during driving.
The onboard refueling vapor
recovery (ORVR) system captures
the fuel vapors during refueling. The
vapors are adsorbed in a canister
filled with activated carbon. While
driving, the fuel vapors are drawn
into the engine and burned off.
322
The Clean Air Act
Crankcase Emissions
Control
Evaporative Emissions
Control System
Onboard Ref ueling
Vapor Recovery
Emissions Controls
395
12/08/09 16:51:17 31SJC670_402
T
e
chnical
Inf
or
mat
ion
In Canada, Honda vehicles comply with
the Canadian emission requirements, as
specified in an agreement with
Environment Canada, at the time they
are manufactured.
System
2014 Ridgeline