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Emission Control System
System Description
The emission
contro
l
system
incl
udes,
a
Three Wa
y
Catalytic Converter
(TWe
), Positive
Crankcase Ventilation
(PCV) system and Evaporative
Emi
ssion
(EVAP) Control
system.
The
emission control system is designed to meet
federal and state emission standards.
Tailpipe Emission
Inspection
Do
not smoke
during this
procedure.
Keep
away
from your work
area.
1.
Start the engine.
Hold the
engine at 3,000
rpm
with
no
load
(in
Park or neutral)
until
the radiator fan
comes
on,
then
let
it idle.
2.
Connect a
tachometer.
3.
Check and. if necessary, adjust the
idle
speed,
(see
page 11·169, 170).
4.
Warm up
and calibrate
the
CO
meter
according to the
meter manufacturer's instructions.
5.
Check idle CO with
the
headlights,
heater
blower, rear
window
defogger,
cooling fan, and air conditioner off.
(Canada) Pull the parking brake
lever
up.
Start the
engine. then
check
that the headlights are off.
CO
meter
shou
ld indicate
0.1%
maximum.
Three Way Catalytic Converter (TWC)
Description
Three Way Catalytic ConvertOl'
(lWC):
The Three
Way Catalytic Converter (TWC) is used to
convert
hydrocarbons (HC), carbon monoxide (CO), and
oxides of
nitrogen
(NOx) in the
exha
ust
gas to carbon
dioxide (C02), dinitrogen (N2) and water vapor.
FRONT OF
~
VEHICLE
THREE WAY
CATALYSTS
(conl'd)
11-199
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Troubleshooting
