Computers and Control Systems: Description and Operation

ELECTRONIC CONTROL SYSTEM
The electronic control system consists of 1) various sensors which detect the state of engine and Driving conditions, 2) ECM which controls various devices according to the signals from the sensors and 3) various controlled devices. Functionally, it is divided into the following sub systems:
^ Fuel injection control system
^ Heated oxygen sensor heater control system
^ Idle air control system
^ Fuel pump control system
^ Evaporative emission control system
^ ESA (Electronic Spark Advance) system
^ EGR system
^ TCC relay control system (3 A/T model)
Also, with 4 A/T model, ECM sends throttle valve opening signal and coolant temp. signal to transmission control module to control A/T.