Automotive Acronyms D

Acronym	Definition	Notes / What Is / Who Is
dB	decibels	Measurement of sound
DC	direct current	Flows in one direction. Usually 12 volts for automotive applications.
DEQ	Department of Environmental Quality	A national or state regulatory agency whose job is to protect the quality of the environment.
DFCO	Deceleration fuel cut-off	A computer command / unit that shuts fuel off to the engine while in gear to improve gas mileage
DFI	direct fuel injection	Injects fuel directly into each combustion chamber.
DLC	data link connector	16 pin connector located under the dash. Where the DTC tester is plugged into.
DMV	Department of Motor Vehicles	State run department for vehicle registrations, driver licenses, custom plates, road tests, title certificates, license plates, inspection stickers and more.
DOC	Department of Commerce	Mission is to help make American businesses more innovative in the US and more competitive overseas.
DOHC	dual overhead cams	Two cam shafts above the valves / pistons of a engine.
DOT	Department of Transportation	Oversees federal highway, air, railroad, and maritime and other transportation administration functions; components include the FAA, FHA, FRA, NHTSA, OIG, and STB.
DRCV	distributor retard control valve	Vacuum valve that controls a distributor. Works along with delay, dump and check valves on deceleration and acceleration.
DTC	diagnostic trouble code	OBD, OBD-II, and OBD2 check engine light codes that translate to a generic or manufacturer specific definition.
DTM	diagnostic test mode	Multiple types of tests, OBD - up systems.
DVDSV	differential vacuum delay and separator valve	OBD, OBD-II term
DVDV	distributor vacuum delay valve	See DRCV
DVOM	digital volt ohm meter	Hand held tester for voltage and resistance.

Note: An Acronym is a abbreviation that is formed using the individual letter components in a phrase, name, organization or thing. Listings on this page are used throughout the automotive industry.

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