Emission Control System; System Description; Tailpipe Emission; Three Way Catalytic - Acura 3.5 RL Manual

Emission Control System

System Description

The emission control system includes a Three Way Cata-
lytic Converter (TWC), Exhaust Gas Recirculation (EGR)
system, Positive Crankcase Ventilation (PCV) system and
Evaporative Emission (EVAP) system. The emission control
system is designed to meet federal and state emission
standards.

Tailpipe Emission

Inspection
Do not smoke during this procedure. Keep
any open flame 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 adjust the idle speed, if necessary (see
page 11-124).
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 condition-
er off.
NOTE: (Canada) Depress the parking brake pedal.
Start the engine, then check that the headlights are
off.
CO meter should indicate 0.1% maximum.
Three Way Catalytic Converter
(TWC)
Description
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 (CO ), dinitrogen (N
2
SECONDARY HEATED OXYGEN SENSOR (SENSOR 2)
HOUSING
) and water vapor.
2
THREE WAY
CATALYSTS