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. ECU compares each voltage input signal to a parameter which is preprogrammed into ECU. It instantly analyzes each of the input voltage values and adjusts output voltage signals accordingly. This allows optimum vehicle performance under a wide variety of operating conditions.

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