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GENERAL INFORMATION
EMISSION CONTROL SYSTEMS
The U.S. Environmental Protection Agency (EPA), the Califo rnia Ai
r
Resou rces Boa rd
(CAR
B), and
Environ
ment Canada
(EC)
require that MUVs comply with applicable exhaust emissions standards du
r
ing its
usefu
l
lif
e, w hen ope rated
and
maintained according to the instruction provided.
SOURCE OF EMISSIONS
The combustion process produces oxides of nitrogen (NOx), carbon monoxide (CO) and hyd rocarbons (He). Controlling
oxides of nitrogen and hydroca rbon
em
issions is very important because,
under certai
n conditions, they react to fo rm
photochemical smog when
su
bjected to sunlight. Carbon monoxide does not
react
in the same way,
b
ut it is toxic.
Honda Motor Co., Ltd. utilizes various system to reduce carbon monoxide,
oxid
es of nitrogen and hyd roca rbons.
EXHAUST EMISSION
CONTROL SYSTEM
The exhaust emission control system
is
composed of the PG
M -FI syst
em and no adjustments
shou
ld be made. The
exhaust emission control system is sepa rate
from
the crankcase
em ission
control
syst
em.
CRANKCASE EMISSION CONTROL SYSTEM
The engine is equipped with a closed cra nkcase
syst
em to prevent discharging crankcase
em
issions into the
atmosphere.
Blow-by gas is returned to the
comb
ustion cham ber through the ai
r
cleaner and throttle body.
SERVICING THE HONDA
U .S.A
.
Only
THROTTLE
BODY
CLE
ANER
CRAN KCASE
BRE ATHER HOSE
-<
I
Fresh air
_
Blow-by gas
Maintenance,
replacement or repair
of the emission control
devices
and
systems
may
be
performed
by any
MUV repair
establishment or individual using parts that are
~
certified
"
to
EPA
standards.
PROHIBITED ACTIONS
The following prohibitions apply
t
o everyone with
respect t
o the engine's
em
ission control system.
You may not remove or disable any device
or
element of design that
m
ay
affect
an en gine's
em
ission levels. This
restriction applies before and
aft
er the engi ne in placed in service.
1-46
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