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Chapter 6
Emissions
control systems
6-3
FRONT
1.3~
Vacuum
schematic
(1990
and
later
2.4L engines)
1
General
information
Refer to illustrations 1.3a, 1.36, 1.312, 1.3d and 1.3e
To prevent
pollution
of the atmosphere
from incompletely
burned
and
evaporating
gases,
and to maintain
good driveability
and fuel economy,
a number
of emission
control
systems
are incorporated.
The principal
sys-
tems
are:
Air aspirator system
Catalytic converter
Deceleration system
Evaporative emission control system
Exhaust Gas Recirculation (EGR) system
Feedback carburetor (FBC) system
Heated air intake system
Jet air system
Multi-Port injection (MPI) system
Oxygen sensor
Positive Crankcase Ventilation (PCV) system
Secondary Air Supply (SAS) system
The Sections
in this Chapter
include
general
descriptions,
checking
procedures
within
the scope
of the home
mechanic
and component
re-
placement
procedures
(when
possible)
for each
of the systems
listed
above.
Before
assuming
an emissions
control
system
is malfunctioning,
check
the fuel and ignition
systems
carefully.
The diagnosis
of some emis-
sion control
devices
requires
specialized
tools, equipment
and training.
if
checking
and servicing
become
too difficult
or if a procedure
is beyond
yourability,
consuitadealerservicedepartment.
Remember,
themostfre-
quent
cause
of emissions
problems
is simply
a loose or broken
vacuum
hose or wire,
so always
check
the hose
and wiring
connections
first (see
illustrations).
This doesn't
mean,
however,
that emission
control
systems
are partic-
ularly difficult
to maintain
and repair.
You can quickly
and easily
perform
many
checks
and do most of the regular
maintenance
at home with com-
mon tune-up
and hand tools.
Note:
Because ofa Federailymandatedex-
tended warranty which covers the emission controlsystem components,
check with your dealer about warranty coverage before working on any
emissions-relatedsystems.
Once the warranty
has
expired, you may
wish
to perform some of the component checks and/or replacement proce-
dures in this Chapter to save money
Pay close
attention
to any special
precautions
outlined
in this Chapter.
it should
be noted that the illustrations
of the various
systems
may not ex-
actly
match
the system
installed
on your
vehicle
because
of $hanges
made
by the manufacturer
during
production
or from year-to-year.
A Vehicle
Emissions
Control
information
label is located
in the engine
compartment
(usually
on the underside
of the hood).
This label contains
important
emissions
specifications
and adjustment
information.
When
servicing
the engine
or emissions
systems,
the VECI label in your particu-
lar vehicle
should
always
be checked
for up-to-date
information.
Fuel ~ressura
FRONT
purge control
solenoid valve
B : Black
G : Green
-
-~
L : Light
Blue
-
R : Red
Y : Yellow
1.3d
Vacuum
schematic
(1990
and later
Federal
and Canadian
3.OL engines)
B : Black
G : Green
L : Light
Blue
R : Red
Y : Yeilow
Fuel
pressure
regulator
EGR valve
Canjster
Throttle body
solenoid
valve
FRONT
EGR dontroi
solenoid
valve
1.3e
Vacuum
schematic
(1990
and later
California
3.OL engines)
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