General Description

The powertrain used in this vehicle consists of a twin cam V8 engine mated to a 4T80-E transaxle. The powertrain has electronic controls to reduce exhaust emissions while maintaining excellent driveability and fuel economy. The Powertrain Control Module (PCM) manages the operation of the engine control system.

The powertrain control module is designed to maintain exhaust emission levels to Federal or California standards while providing excellent driveability and fuel efficiency. Review the components and wiring diagrams in order to determine which systems are controlled by the PCM. The PCM monitors numerous engine and vehicle functions. The following are some of the functions that the PCM controls:
^ Engine fueling
^ Ignition Control (IC)
^ Knock Sensor (KS) system
^ Evaporative Emission ([1][2]EVAP) system
^ Secondary Air Injection (AIR) system (if equipped)
^ Exhaust Gas Recirculation (EGR) system
^ Automatic transmission functions
^ A/C clutch control
^ Cooling fan control