Camaro, Firebird, 1999 - 2002

Purpose Of Onboard Diagnostics


The purpose of Onboard Diagnostics is to provide optimum control of the engine and transmission while meeting the objectives of the OBD II regulations. At the center of this system is a PCM connected to input and output devices via a wiring harness. The PCM receives information from sensors and switches, performs calculations based on data stored in memory and controls various output devices.