Computerized Engine Controls: Notes

The Electronic Concentrated Engine Control System (ECCS) is a computerized emission, ignition and fuel control system. An Electronic Control Unit (ECU) accepts input voltage signals from a variety of input components. The ECU compares each of the voltage input signals to a preset parameter which is preprogrammed into the ECU. It instantly analyzes each of the input voltage values and adjusts output voltage signals accordingly. This allows the vehicle to perform at its optimum under a wide variety of operating conditions.

Voltage to ECU and components requiring battery voltage is supplied by the ECCS relay. Relay is utilized to protect ECU in the event of reverse polarity at the battery cables. To determine power distribution to ECCS components on specific models, see WIRING DIAGRAMS article in the ENGINE PERFORMANCE Section.