Definition Of Terms
A.C.: Alternating Current
ACT
Harness:
The wiring harness used to connect the actuators to the ECM
AFC: Air Fuel Control; a device in the fuel pump that limits the fuel delivery until
there is sufficient intake manifold pressure to allow for complete combustion.
Alligator Clip: An electrical test clip attached to the end of a wire
API: American Petroleum Institute
ASA: Air Signal Attenuator
ASTM: American Society of Testing and Materials
ATDC: After Top Dead Center; refers to the position of the piston or the crankshaft
rod journal. The piston is moving downward on the power stroke or intake
stroke.
BDC: Bottom Dead Center; refers to the position of the piston or the crankshaft rod
journal. The piston is at its lowest position in the cylinder.
BTDC: Before Top Dead Center; refers to the position of the piston or the crankshaft
rod journal. The piston is moving upward on the power stroke or exhaust
stroke.
C: Celsius
CAC: Charge Air Cooler
CARB: California Air Resources Board
CELECT™: A fuel control system that electronically controls the fuel injection to improve
fuel economy and to reduce the exhaust emissions. The system does this by
controlling the torque and horsepower curve, AFC (smoke) function, engine
high speed, engine low idle speed and the road speed.
The CELECT™ system also can control fan clutch operation, engine brake
enabling and turbocharger wastegating.
Additional electronic features include cruise control, PTO, gear down protec-
tion, progressive shifting, automotive or VS governor and idle shutoff.
C.I.D.: Cubic Inch Displacement
Circumferential Direction: In the direction of a circle in respect to the centerline of a round part or a
bore.
Cm: Centimeter
Compulink™: A Cummins service tool used for electronic system analysis and to repro-
gram the system
Concentricity: A measurement of the difference between the centers of either two or more
parts, or the bores in one part.
CPL: Control Parts List; this listing identifies the specific parts that must be in-
stalled on the engine to meet agency certification.
cSt: Centistokes
Cummins Sealant: This is a one part Room Temperature Vulcanizing (RTV) silicone rubber, ad-
hesive and sealant material having high heat and oil resistance, and low
compression set.
Definition Of Terms Section i - Introduction
N14Page i-12
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