Powertrain Control
POWERTRAIN CONTROL SYSTEM DESCRIPTIONThe powertrain used in this vehicle consists of a dual overhead cam engine mated to a 4T80-E electronically controlled transaxle. It has controls to reduce exhaust emissions while maintaining excellent driveability and fuel economy. The Powertrain Control Module (PCM) is the heart of this control system. The Control Module refers to the PCM and the Vehicle Control Module (VCM).
The 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 each specific control module. The control module monitors numerous engine and vehicle functions.
COMPUTER CONTROLLED COMPONENTS AND SYSTEMS
The control module controls the following operations:
^ Fuel control
^ Ignition Control (IC)
^ Knock Sensor (KS) system
^ Automatic transmission shift functions
^ Cruise Control Enable
^ Generator
^ Evaporative Emission (EVAP) Purge
^ A/C Clutch Control
^ Cooling Fan Control