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Emission Gontrol System
System Description
Three Way Catalytic Converter (TWCI
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T h e e m i s s i o n c o n t r o l s y s t e m i n c l u d e s a T h r e e W a y
Catalytic Converter (TWC), Positive Crankcase Ventilation
(PCV) system and Evaporative Emission (EVAP) Control
system. The emission control system is designed to meet
tederal and state emission standards.
InsDeciion
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Do not smoke during this procedure. Keep
any open llame away from your work area.
1. Start the engine. Hold the engine at 3,000 rpm with
n o l o a d { i n P a r k o r n e u t r a l ) u n t i l t h e r a d i a t o r f a n
comes on, then let it idle.
2.
Connect a tachometer.
Check and adjust the idle speed, if necessary (see
p a g e ' 1 1 - 1 1 ! ) .
Warm up and calibrate the CO meter according to the
meter manufacturer's instructions.
Check idle CO with rhe headlights, heater blower,
rear window defogger, cooling fan, and air condition-
er off.
N O T E : { C a n a d a ) P u l l t h e p a r k i n g b r a k e l e v e r u p .
Start the engine, then check that the headlights are
olf.
CO meter should indicste 0.17o maximum.
DescriDtion
The Three Way Catalytic Converter {TWC) is used to convert hydrocarbons (HC), carbon monoxide (CO), and oxides of
nitrogen (NOx) in the exhaust gas, to carbon dioxide (COr), dinitrogen {Nr) and water vapor.
Bl8Cl engine l818Bl, 818C5 engines is similar):
FRONT OF
VEHICLE
PRIMAEY
HEATED
OXYGEN SENSOR
IPRIMARY HO2S}
HOUSING
WAY
CATALYSTS
SECONOARY
HEATED
OXYGEN SENSOR
{SECONDARY
H02St
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Troubleshooting
