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Glossary
GLOSSARY OF TERMS AND ABBRREVIATIONS
Chapter 6 78
BASE IDLE – Idle RPM when the throttle lever rests on the
throttle stop and the Idle Speed Control is fully retracted and
disconnected.
BCM – Body Computer Module.
BOO – Brake On-Off input to the computer.
BOOST – Condition of over-pressure (above atmospheric) in
the intake manifold; caused by intake air being forced in by a
turbocharger or supercharger.
BP – Barometric Pressure sensor. Used to compensate for
altitude variations.
BPA – ByPass Air solenoid.
BTDC – Before Top Dead Center.
BVT – Back-pressure Variable Transducer.
CANISTER – A container, in an evaporative emission system,
that contains charcoal to trap fuel vapors from the fuel system.
CANISTER PURGE SOLENOID – Electrical solenoid or its
control line. Solenoid opens a valve from fuel vapor canister
line to intake manifold when energized. Controls flow of
vapors between carburetor bowl vent and carbon canister.
CANP – Canister Purge solenoid.
CATALYTIC CONVERTER – Muffler like assembly placed
in exhaust system that contains a catalyst to change
hydrocarbons and carbon monoxide into water vapor and
carbon dioxide.
CCC – Converter Clutch Control solenoid or its circuit.
CCD – Computer Controlled Dwell, used on Ford Vehicles.
CCO – Converter Clutch Override output from the computer
processor to the transmission.
CCS – Coast Clutch Solenoid or its circuit.
CENTRAL FUEL INJECTION – Computer control fuel
injection at throttle body, used on Fords, same as throttle body
injection.
CER – Cold Enrichment Rod.
CES – Clutch Engage Switch.
CFI – Central Fuel Injection.
CHECK ENGINE LIGHT – Dash panel light used either to
aid in identification and diagnosis of a system problems or to
indicate that maintenance is required.
CHECK VALVE – Valve that operates like a one-way gate.
CID – Cylinder Identification sensor or its circuit.
6
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