Powertrain Control Module (PCM)

Powertrain Control Module Description
The Control Module refers to the Powertrain Control Module (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. 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

Powertrain Control Module:

Powertrain Control Module (PCM)
The Powertrain Control Module (PCM) is the control center of the fuel injection system. It constantly looks at the information from various sensors, and controls the systems that affect emission or engine performance. The PCM also performs the diagnostic function of the system. It can recognize operational problems, alert the driver through the Malfunction Indicator Lamp (MIL), and store a DTC or DTCs which identify the problem areas to aid the technician in making repairs. See Introduction in Powertrain Control Module for more information on using the diagnostic functions of the PCM.