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. Voltage to ECM and components requiring battery voltage is supplied by a safety relay and/or a main relay. Safety relay is used to prevent damage to ECM in the event of reverse polarity at the battery cables.