Powertrain Management: Description and Operation

PURPOSE
Modern computer management systems regulate a variety of subsystems and accessories.

Since computer management is complex, it is helpful to divide information into sub-categories as explained below.

INFORMATION STRUCTURE
Information in COMPUTER, FUEL, IGNITION AND EMISSION SYSTEMS is divided into the following four major topics:

Computerized Engine Controls
Addresses the on-board computer system and components as related to vehicle management. Consult this section for information regarding on-board diagnostics, sensor inputs, computer outputs, etc.

Emission Controls
Addresses emission related systems and components only. Includes (but is not limited to) Exhaust Gas Recirculation (EGR) systems, Evaporative Emission (EVAP) systems, Positive Crankcase Ventilation (PCV) systems, Exhaust Emission controls, Air Injection Systems (AIS), etc.

Fuel Systems
Focuses on systems and components related to fuel and intake air delivery. Does NOT include information regarding electronic engine controls.