Computerized Engine Controls: Notes

The Electronic Concentrated Control System (ECCS) is a computerized emission, ignition, and fuel control system. A single Engine Control Module (ECM) uses input voltage signals received from various input components to control output.

ECM compares each input signal to the appropriate parameter preprogrammed in ECM and adjusts output voltage signals accordingly. This allows optimum vehicle performance under various conditions. On most models voltage to ECM is supplied by ECCS relay. ECCS relay has a self shut-off feature that cuts power to ECM a few seconds after ignition is turned off.