EXHAUST EMISSION CONTROL SYSTEM
-Intake Manifold Vacuum Control-
The vacuum control valve is provided to reduce the
engine lubricating oil consumption when the intake
manifold vacuum increases to
a very high level
during deceleration
The vacuum control valve senses
the manifold
vacuum.
As the manifold vacuum increases beyond
the specified valve, the valve opens and
air IS
sucked into the intake manifold
,-intake collecior
\'I
vacuum COntiOl vaivel
A A C valve or de-up rolenoid valve housing
SEC303A
- Catalytic Converter
The exhaust gas contains unburned, harmful gases
While the mixture ratio
is maintained to the
stoichiometric point by the mixture ratio feedback
system, the three-way catalytic converter activates
to oxidize and reduce harmful
gases (HC, CO and
NO.<) into harmless gases (CO,, H, 0 and N2 1 In
this way, the catalytic converter cleans the exhaust
gas and emits CO,, H,O and N, into the at-
mosphere
E ( C S Control unit? yThree-way catalytic Converter
'h
Exhsurt gar renror,
Hydrocarbon Carbon monoxide nltrogen oxide
Carbon dioxide gar. nitrogen gas, water
SEC304A
EF & EC-75
