Cruise

PCM MONITORS:
^ Engine Temperature (ECT Sensor)
^ Manifold Vacuum (MAP Sensor)
^ Engine RPM (distributor pick-up)
^ Throttle Position (TPS)
^ Exhaust Gas Oxygen Content (HO2S)
^ A/C Switch Status
^ Battery Voltage

PCM CONTROLS:
^ Air/fuel ratio, by varying injector pulse width. Switches injector ground on and off twice per engine revolution.
^ Idle speed, through the IAC motor.
^ Ignition timing.
^ Monitor oxygen sensor and fine tune air/fuel ratio by varying injector pulse width
^ Operate A/C Compressor Clutch relay (if selected)