Computerized Engine Controls: Notes

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

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