The primary membership of ADS consists of independent repair shops (Service Members) specializing in diesel fuel injection, governor and turbocharger service. Each Service Member is authorized by one or more of the Association's Manufacturer Members, which are original equipment (OEM) manufacturers of fuel injection equipment, governors, superchargers or turbochargers.

Other membership catagories encompass manufacturers and distributors of replacement parts and allied equipment, and post-secondary schools offering programs in diesel mechanic training.