Engine Emissions Management — General Information (Honda Accord 3)

Illustrations and diagrams of the vacuum emission control are located at the end of this chapter. They should be referred to before beginning installation or testing. Electrical diagrams are located at the end of the chapters 6.

There are three main types of pollutants produced by a vehicle: crankcase gases, exhaust gases, and gasoline vapors. The pollutants of these types are divided into three categories: unburned hydrocarbons (HC), carbon monoxide (CO), and nitrogen oxides (NOx). The equipment in a vehicle designed to limit the emission of these substances is called engine emission control equipment and is regulated by the laws of the region in which the vehicle is operated. Due to the differences in legislation in different countries, each country has its own emission control equipment.

Terms used in this chapter:

• CO: carbon monoxide.
• CVC: Continuous Volume Control Valve.
• EACV: Automotive Air Control Valve.
• ECU: on-board computer.
• HC: unburned hydrocarbon.
• MAP sensor: Manifold Absolute Pressure Sensor.
• PA sensor: atmospheric pressure sensor.
• TA-sensor: intake air temperature sensor.
• TDC (or TDC): top dead center.
• TW-sensor: engine coolant temperature sensor.

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