D  -  Drive
DC -  Direct Current
DEF. -  Defrost
DEFOG. -  Defogger
DEFI - Digital Electronic Fuel Injection
DFI -  Digital Fuel Injection
DFS - Deceleration Fuel Shutoff
DIAG. -  Diagnostic
DTC -  Diagnostic Trouble Code
DIC -  Driver Information Center
DIS -  Distributorless Ignition System
DIST -  Distribution
DLC -  Data Link Connector
DOHC -  Double Overhead Cam
DTC - Diagnostic Trouble Code
DVOM -  Digital Volt-Ohmmeter