1995 Honda Civic Owner's Manual - Page 167

Emissions Controls the time the vehicles are manufactured. into the engine and burned during driving. 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. Three-Way Catalytic Converter The Three-Way Catalytic Converter is in the exhaust system. Through chemical reactions, it converts HC, CO, and NOx in the engine's exhaust to carbon dioxide (CO2), dinitrogen (N 2 ), and water vapor. Replacement Parts The emissions control systems are designed and certified to Crankcase Emission Control System Your car has a Positive Crankcase Ventilation (PCV) System. This keeps gasses that build up in the engine's crankcase from going into the atmosphere. The PCV valve routes them from the crankcase back to the intake manifold. They are then drawn into the engine and burned. Exhaust Emission Controls The exhaust emission controls include three systems: PGM-FI, Ignition Timing Control, and Three-Way Catalytic Converter. These three 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. PGM-FI System The PGM-FI System uses a sequential multiport fuel injection. It has three sub-systems: Air Intake, Engine Control, and Fuel Control. The Engine Control Module (ECM) Evaporative Emission Control System As fuel evaporates in the fuel tank, an evaporative emission control canister filled with charcoal adsorbs the vapor. It is stored in this canister while the engine is off. After the engine is started and warmed up, the vapor is drawn Technical Information