Delphi grew from the component operations of General Motors, whose divisions included Delco electronics and Rochester fuel systems, and it was established as an independent company in 1999. After later restructuring, the Delphi Technologies business focused on fuel injection and powertrain electronics and became part of the BorgWarner group in 2020.

Delphi is known for engine management systems, gasoline and diesel fuel injection, sensors, electronic control units and emission components supplied to many of the world's car and truck makers. Its diesel common-rail systems and aftermarket service equipment are widely used by professional repair shops.

Workshop manuals covering Delphi equipment concentrate on fuel systems and engine electronics: injector and pump service, common-rail and high-pressure systems, sensors and control units, wiring diagrams, diagnostic procedures, fault codes and the specifications needed for accurate repair. The material reflects real workshop practice, where fuel, electronic and engine systems must be tested together to find faults quickly.

Independent garages, diesel specialists and DIY owners maintaining vehicles with Delphi engine management will find detailed service information essential for correct diagnosis and repair of modern fuel and electronic systems. Up-to-date Delphi service information is especially useful for shops working on common-rail diesels and modern petrol engines, where specialist data is otherwise hard to find. Accurate data reduces trial-and-error work and helps shops complete injection and electronics jobs on the first attempt.