EEC-IV Theory/Operation: Operation: Notes

The engine control system consists of the ECA, sensors, switches, and actuators. In order for the ECA to perform properly, it must be kept constantly informed of engine operating conditions.

It is the task of the engine sensors to supply the ECA with specific information, in the form of electrical signals, required to determine engine operating conditions. The ECA sends out electrical signals to control air/fuel ratio, emission controls, idle speed and ignition timing.

The ECA controlled automatic transmission components consist of the Lock-Up Solenoid (LUS), Converter Clutch Override (CCO) and Shift Solenoid 3-4/4-3 (SS 3-4/4-3). Transmission input sensors consist of a temperature sensor, switches, and speed sensor. Individual component operation is as follows. All components may not be used on every vehicle: