When the term Powertrain Control Module (PCM) is used, it will refer to the engine control computer regardless that it may be called a Powertrain Control Module (PCM) or Engine Control Module (ECM).
The PCM is designed to maintain exhaust emission levels to Federal or California standards, while providing excellent driveability and fuel efficiency. Review the component sections and wiring diagrams to determine which systems are controlled by each specific control module. The control module monitors numerous engine and vehicle functions and controls the following operations.
Ignition control (IC)
Knock Sensor (KS) system
Automatic Transaxle shift functions
Cruise Control Enable
Evaporative Emission (EVAP) Purge
A/C Clutch Control
Cooling Fan Control