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Glossary
GLOSSARY OF TERMS AND ABBRREVIATIONS
79 Chapter 6
CKT – Circuit.
CL – Closed Loop.
CLC – Converter Lock-up Clutch.
CO – Carbon Monoxide.
COC – Conventional Oxidation Catalyst.
COMPUTER TIMING –Total spark advance in degrees
before top dead center. Calculated by Ford EEC-IV processor,
based on sensor input.
CONTINUOUS SELF-TEST – Continuous test of Ford EEC-
IV system conducted whenever vehicle is in operation.
CPS – Crankshaft Position Sensor. Provides the ECU with
engine speed and crankshaft angle (position).
CTS – Coolant Temperature Sensor.
CURB IDLE – Computer controlled idle rpm.
CVR – Control Vacuum Regulator.
CWM – Cold Weather Modulator.
CYLINDER IDENTIFICATION SIGNAL (CID) – A signal
generated by crankshaft timing sensor, used to synchronize
ignition coils, due to the fact that some models use a 2 ignition
coil pack DIS system.
C
3
I – Computer Controlled Coil Ignition. Produces ignition
spark without aid of an ignition distributor.
DCL – Data Communications Link.
DERM – Diagnostic Energy Reserve Module and air bag (SIR)
controller.
DFS – Decel Fuel Shut-off.
DIC – Driver Information Center.
DID – Driver Information Display.
DIS – Direct Ignition System. Produces ignition spark without
aid of an ignition distributor. (Similar to C3I).
DOL – Data Output Link. Fuel calculation data from EEC-IV
processor to trip computer.
DPDIS – Dual Plug Distributorless Ignition System, used on
some Ford 2.3L engines.
DPI – Dual Plug Inhibit, used on some Ford 2.3L engines.
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.
6
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