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Electronic Control Unit. Generally refers to the 'computer' that controls the fuel injection system.

The electronic control unit (ECU) is part of Volkswagen’s Digifant fuel-injection and engine-management system. Gerry’s 1986–1991 technical bulletin index distinguishes these applications from the earlier Digijet years. In a January 1999 list thread, an owner of a 1986 Westfalia reported that the engine quit after cooling-system bleeding and asked whether fuel starvation or a failed Digifant component was involved; the thread records a troubleshooting question, not a confirmed diagnosis. Check engine code and market before identifying an ECU.

A bundle of electrical wires and connectors

Metal studs that provide a grounding point for electrical components

Computer that controls the engine's functions, such as fuel injection and ignition timing