Electronic Control System

The electronic control system monitors engine operating conditions, processes these conditions, and then controls the engine for optimum performance and minimum emissions.

Input signals are generated by the Engine Coolant Temperature (ECT) sensor, Mass Airflow (MAF) sensor, Exhaust Oxygen (O2) sensor, Throttle Position Sensor (TPS), Park and Neutral switch, and Vehicle Speed Sensor (VSS). Sunbird and Skyhawk 1.8L turbo and Fiero 2.8L use Manifold Air Temperature (MAT) sensor and Manifold Absolute Pressure (MAP) sensor instead of MAF sensor.

The ECM also receives signals from the starter solenoid, the air conditioner selector switch and the ignition distributor.