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ACS

[1] Air control solenoid [2] Active Comfort Seats.

ACSE

An acronym for the Automotive Cooling System Institute.

ACT

[1] An acronym for air charge temperature. [2] An acronym for Alternative Control Technique

Activate

The steps necessary to turn a feature or function on.

Active Coil

Those coils that are free to deflect under a load.

Active Plate Material

The sponge lead in an automotive battery that is spread over the negative-plate grid or the lead peroxide that is spread over the positive-plate grid.

Active Restraint

A vehicle occupant restraint, such as a lap belt and/or shoulder harness, that must be attached or connected by the person using it.

Active Solvent

A liquid that can dissolve a paint binder when used alone.

Active Spring Coil

Active coils in the center of the spring operate during the complete range of spring loading. Also, see inactive spring coil and transitional spring coil.

Active Suspension System

Also known as computer-controlled suspension system, a computerized system able to control body roll, body pitch, brake dive, acceleration squall, and ride height. Suspension systems that are controlled by double-acting hydraulic cylinders or solenoids (actuators) mounted at each wheel. The actuators support the vehicles weight, instead of conventional springs or air springs.

Active Testing

OBD-II Diagnostic testing in which the PCM controls the system or component in a specific action while monitoring takes place.

ACTS

Air charge temperature sensor.

Actual Cash Value (acv)

The true value of a product, such as a used vehicle.

Actual Throat

A welding term indication the shortest distance between the weld root and the face of a fillet weld.

Actuator

1.Any device that receives an output signal or command from a computer and does something in response to the signal 2. A device that translates hydraulic pressure into mechanical energy

ACV

1. An acronym for air-control valve. 2. An acronym for actual cash value.

ACVD

Air cleaner vacuum diaphragm.

AD

Air diverter.

Adapter

1. Any of various pieces of hardware that permits non-matching parts to connect, mesh, or function together. 2. A device used to connect an engine and a transmission not originally designed to be used together. 3. Welds under a spring seat to increase mounting height of the fit seal to the axle.

Adaptive Memory

The feature of a computer memory that allows the microprocessor to automatically compensate for changes in the dynamics of the process being controlled. Anything stored in adaptive memory is lost when power to the computer is interrupted, such as when the battery is disconnected.