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.
Controlling the production of NOx,
CO, and HC is important to the
environment. Under certain
conditions of sunlight and climate,
NOx and HC react to form photochemical‘‘smog. ’’Carbon
monoxide does not contribute to
smog creation, but it is a poisonousgas. The Clean Air Act
The United States Clean Air Actꭧsets
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.
ꭧIn Canada, Honda vehicles comply
with the Canadian emission
requirements, as specified in an
agreement with Environment Canada,
at the time they are manufactured.
Crankcase Emissions Control System
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. Evaporative Emissions Control System
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.
Onboard Refueling Vapor Recovery
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.
Emissions Controls
316
Table of Contents
7. Select a nearby lightly traveledmajor highway where you can
maintain a speed of 50 to 60 mph
(80 to 97 km/h) for at least 20
minutes. Drive on the highway in
D (automatic) or 5th (manual). Do
not use cruise control. When
traffic allows, drive for 90 seconds
without moving the accelerator
pedal. (Vehicle speed may vary
slightly; this is okay.) If you cannot
do this for a continuous 90
seconds because of traffic
conditions, drive for at least 30
seconds, then repeat it two more
times (for a total of 90 seconds). 8. Then drive in city/suburban traffic
for at least 10 minutes. When
traffic conditions allow, let the
vehicle coast for several seconds
without using the accelerator pedal
or the brake pedal.
9. Make sure the vehicle has been parked with the engine off for 30minutes.
If the testing facility determines the
readiness codes are still not set, see
your dealer.
Emissions Testing
320
Table of Contents
