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DAB
Delayed Accessory Bus
Data Output Line to IPC
Fuel calculation data from EEC-IV processor to trip computer.
DATA OUTPUT LINK (DOL)
Data Output Link. Fuel calculation data from EEC-IV processor to trip computer.
dB
Decibels
DC
Direct Current
DC
Duty Cycle
DCISCA
DC Motor Idle Speed Actuator
DCL
Data Communication Link
DDL
Diagnostic Data Link
DE
Drive End
DEAD SHORT
A short circuit having zero resistance.
DEC
Digital Electronic Controller
DE-ENERGIZED
The condition of an electrical circuit having the electric current or energy source turned off.
DEFI
Digital Electronic Fuel Injection (Cadillac)
DEPS
Digital Engine Position Sensor
DERM
Diagnostic Energy Reserve Module and air bag (SIR) controller.
DETONATION (KNOCK) SENSOR
A piezoelectric device which responds to spark knock (caused by over-advanced ignition timing) and transmits this information to the vehicle's on-board computer. The computer uses this signal to retard ignition timing during knock conditions.
DFCO
Decel Fuel Cutoff Mode
DFI
Direct Fuel Injection
DFS
Decel Fuel Shutoff
DI
Distributor Ignition (System)
DI
Direct Ignition
DIAGNOSTIC MODE
The mode of operation used by the vehicle's on-board computer to transmit Fault Codes (representing vehicle malfunctions). The computer retains Fault Codes for malfunctions which have occurred in the last 50 ignition cycles.
DIAGNOSTIC READ-OUT BOX (DRB)
The Chrysler Motors tester used to diagnose the on-board computer system. The DRB displays specific values in various modes, and displays Fault Codes, to assist the technician in diagnosing and correcting vehicle malfunctions.
DIAPHRAGM
A mechanical component which moves a control lever when a vacuum signal is applied.
DIC
Driver Information Center
DICM
Distributor Ignition Control Module
DID
Driver Information Display.
DIELECTRIC
The insulating material used between the plates of a capacitor or condenser.
DIGITAL CONTROLS
Circuits which process and/or transmit information by switching current on and off.
DIGITAL INJECTION
Cadillac brand name for Throttle body Fuel Injection.
DIGITAL VOLT-OHMMETER (DVOM)
A device which measures voltage and resistance in an electrical circuit. Readings are displayed in digital form on a liquid crystal display (LCD).
DIODE
An electronic component which allows current flow in one direction and insulates (blocks current flow) in the opposite direction.
DIRECT CURRENT (DC)
Electrical current which flows in one direction only.
Direct Ignition (Waste Spark)
Produces ignition spark without aid of an ignition distributor. (Similar to C3I).
DIRECT IGNITION SYSTEM (DIS)
Produces ignition spark without the aid of an ignition distributor.
DIRECT IGNITION SYSTEM (DIS)
Produces ignition spark without the aid of an ignition distributor.
DIS
Direct Ignition (Waste Spark)
DISTANCE (SPEED) SENSOR
Sensor is mounted at the transaxle tailshaft housing which transmits a signal representing vehicle speed to the vehicle's on-board computer.
DISTRIBUTOR
A device which directs secondary current from the induction coil to the spark plugs of a multi-cylinder engine, in proper firing order.
DIY
Do-It-Yourself
DLC
Data Link Connector (OBD)
DM
Drive Motor
DMCM
Drive Motor Control Module
DMCT
Drive Motor Coolant Temperature
DMPI Module
Drive Motor Power Inverter Module
DMS
Distributor Modulator System
DOHC
Dual Overhead Cam
DOL
Data Output Line to IPC
DPC
Dynamic Pressure Control
DPDIS
Dual Plug Distributorless Ignition System, used on some Ford 2.3L engines.
DPFE
Differential Pressure Feedback
DPI
Dual Plug Inhibit, used on some Ford 2.3L engines.
DRAW
The amount of electric current used by a load or circuit.
DRB II
Diagnostic Readout Box (Chrysler)
DRCV
Distributor Retard Control Valve
Drive Cycle
An extended set of driving procedures that takes into consideration the various types of driving conditions encountered in real life.
DRIVER
A transistor used to open and close the ground circuit of an output device (solenoid, relay, etc.)
Driving Condition
A specific environmental or operation condition under which a vehicle is operated; such as starting the vehicle when cold, driving at steady speed (cruising), accelerating, etc.
DRL
Daytime Running Lights
DSO
Digital Storage Oscilloscope
DSR
Ford Diagnostic Subroutine
DSS
Downshift Solenoid
DSSA
Dual Signal Spark Advance (Ford)
DSV
Deceleration Solenoid Valve
DTC FRZ
Diagnostic Trouble Code Freeze Frame
DTC(s)
Diagnostic Trouble Code(s)
DTM
Diagnostic Test Mode
DTVS
Dual Temperature Vacuum Switch
DUAL CATALYTIC CONVERTER
Combines 2 converters in one shell. Controls NOx, HC and CO. Also called TWC.
DURA SPARK SYSTEM
The Ford ignition system used with the 5.8L feedback carbureted MCU control system.
DUTY CYCLE
The percentage of time that the vehicle's on-board computer energizes a solenoid.
DV
Delay Valve
DV TW
Delay Valve, 2 Way.
DVAC
Distributor Vacuum Advance Control Valve
DVDSV
Differential Vacuum Delay and Separator Valve
DVDV
Distributor Vacuum Delay Valve
DVM (10 MEG)
Digital voltmeter with a minimum of 10 million ohms resistance. Allows measurement in circuit without affecting the circuit operation.
DVOM
Digital Volt-Ohmmeter
DV-TW
Relay Valve Two Way
DVVV
Distributor Vacuum Vent Valve
DWELL
Amount of time (recorded on a dwell meter in degrees) that current passes through a closed switch.
