PC

1. Acronym for Pitch circle
2. Acronym for Polycarbonate
3. Acronym for Pressure Control

PCB

1. Acronym for Printed circuit board
2. Acronym for Polychlorinated biphenyl. Difficult to remediate chemical used in old-style transformers. Concentrated PCBs used to be referred to as 1268.

PCD

Acronym for Pitch circle diameter

PCI

1. Acronym for Program comparison and identification
2. Acronym for Programmable Communications Interface

PCM

Acronym for Powertrain Control Module A computer that controls the operation of the engine's fuel, ignition, and emission-control systems as well as the transmission on vehicles with automatic transmission.

PCME

Acronym for Powertrain control module

PCS

Acronym for Pressure Control Solenoid

PCV

Acronym for Positive crankcase ventilation.

PCV system

Acronym for Positive crankcase ventilation system. A system which prevents Crankcase vapors from being discharged directly into the atmosphere.

Also see

• Closed crankcase ventilation.

PCVV

Acronym for Positive crankcase ventilation valve

PCV valve

(PCVV) Part of the Positive crankcase ventilation system, which reroutes Crankcase Blowby to the Intake manifold and back to the engine, where it is reburned in the Cylinders as part of the Fuel-air mixture. This cuts emission pollution and improve Fuel economy because unburned fuel in the Blowby is consumed the second time around. It also keeps the Blowby and water vapor from fouling the oil in the Crankcase, thus reducing the formation of engine Sludge.

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