Crankcase Emissions Control System - Honda 2000 Passport Owner's Manual

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maintain them. This section
summarizes how the emissions
controls work. Scheduled
maintenance is on page 200.
Crankcase Emissions
Control System
Your vehicle has a Positive
Crankcase Ventilation System.
This keeps gasses that build up in
the engine's crankcase from going
into the atmosphere. The Positive
Crankcase Ventilation valve
routes them from the crankcase
back to the intake manifold. They
are then drawn into the engine and
burned.
Evaporative Emissions
Control System
As gasoline evaporates in the fuel
tank, an evaporative emission
control canister filled with
charcoal adsorbs the vapor. It is
Owner Assistance
stored in this canister while the
engine is off. After the engine is
started and warmed up, the vapor
is drawn into the engine and
burned during driving.
Exhaust Emissions Controls
The exhaust emission controls
include four systems: Fuel
Injection, Ignition Timing
Control, Exhaust Gas
Recirculation, and Three-Way
Catalytic Converter. These four
systems work together to control
the engine's combustion and
minimize the amount of HC, CO,
and NOx that comes out the
tailpipe. The exhaust emission
control systems are separate from
the crankcase and evaporative
emission control systems.
Fuel Injection System
The Fuel Injection System uses
sequential multiport fuel injection.
It has three subsystems: Air
Intake, Engine Control, and Fuel
Control. The Engine Control
Module (ECM) uses various
sensors to determine how much
air is going into the engine. It then
controls how much fuel to inject
under all operating conditions.
Ignition Timing Control System
This system constantly adjusts the
ignition timing, reducing the amount
of HC, CO and NOx produced.