Powertrain Management: Description and Operation

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.

The fuel metering system is made up of the following parts:
^ The fuel injectors.
^ The throttle body.
^ The fuel rail.
^ The fuel pressure regulator.
^ The PCM.
^ The crankshaft position sensor.
^ The camshaft position sensor.
^ The Idle Air Control (IAC) valve.
^ The fuel pump.
^ The fuel pump relay.

The electronic ignition system does not use the conventional distributor and coil. The ignition system consists of three ignition coils, an ignition control module, a dual Hall-effect crankshaft position sensor, an engine crankshaft balancer with interrupter rings attached to the rear, related connecting wires, and the Ignition Control (IC) and fuel metering portion of the PCM.