Powertrain Control Module (PCM)

PCM:

Figure C1-1 - Powertrain Control Module (PCM):

The Powertrain Control Module (PCM) is the control center of the vehicle. It controls the following items:
^ Fuel control
^ Ignition Control (IC)
^ Knock Sensor (KS) system
^ Automatic transmission shift functions
^ Cruise Control Enable (if so equipped)
^ Generator (if so equipped)
^ Evaporative Emission (EVAP) Purge
^ A/C Clutch Control
^ Cooling Fan Control
^ On-board diagnostics for powertrain functions. It constantly looks at the information from various sensors, and controls the systems that affect vehicle performance. The PCM also performs the diagnostic function of the system. It can recognize operational problems, alert the driver through the MIL, and store diagnostic trouble codes which identify the problem areas to aid the technician in making repairs.