Powertrain Management: Description and Operation
POWERTRAIN CONTROL MODULEThe Powertrain Control Module (PCM) will be referred to as a control module. The control module constantly monitors information from various input sensors and controls the various component systems. The control module in OBD II equipped vehicles also performs diagnostic tests of emissions related systems to ensure that the systems operate correctly and have not degraded to a point when the vehicle emissions will exceed local emission standards.
The control module monitors numerous engine and vehicle functions and controls the following operations:
^ Fuel control
^ Ignition Control (IC)
^ Automatic Transaxle shift functions
^ Cruise Control Enable
^ Generator
^ Evaporative Emission (EVAP) Purge
^ Exhaust Gas Recirculation (EGR)
^ A/C Clutch Control
^ Cooling Fan Control