Glossary

ammeter

instrument used to measure electrical current flow in a circuit.

AVR

alternator voltage regulator; refers to a device that is used to test generators/alternators for electrical output, voltage and amperage.

Block A Occupational Skills

repetitive general skills for many tasks performed by an automotive service technician.

Block B Engine Systems

this block consists of the basic engine components and their related support systems.

Block C Vehicle Management Systems

this block consists of the diagnosis and repair of computer controlled modules and their related circuitry and software, including systems such as engine management, transmission controls and ABS systems.

Block D Drive Line Systems

this block consists of the components that direct the power flow from the engine to the wheels.

Block E Electrical and Comfort Control Systems

this block consists of the diagnosis and repair of the vehicle electrical system including accessories, options and entertainment systems as well as the vehicle comfort systems.

Block F Steering, Suspension, Braking and Control Systems

this block consists of the components that control the steering, handling, support and braking of the vehicle.

Block G Body Components, Trim and Restraint Systems

this block consists of restraint systems, trim systems and other body components of the vehicle.

CAN

a protocol for communication between electronic/computer modules.

condenser (A/C)

device used in an air conditioning system to allow the dissipation of heat.

condenser (electrical)

electrical device that acts to store an electrical charge preventing voltage surges.

DVOM

meter for measuring voltage, amperage, resistance (ohms) and is digital in its operation.

gerotor

a positive displacement pump which utilizes a drive shaft with an inner and outer rotor.

inclinometer

device used to measure the incline of an object, measured in degrees.

jounce

the motion of a wheel that compresses its suspension. Full jounce refers to a wheel that is at the upper limits of its travel. Jounce is the opposite of rebound.

manometer

a graduated tube containing water which measures pressure/vacuum in units of water column.

micrometer

a precision measuring device for small distances.

O2 Sensor

device used to measure the oxygen content of exhaust gases.

OBD I and OBD II

on board diagnostics are part of a vehicle’s engine management software used to monitor system performance. OBD II is a second generation program that performs as dictated by standards established by the Society of Automotive Engineers.

Ohm’s Law

the relationship between current, resistance and voltage in any electrical circuit. Voltage in circuit is equal to the current (in amperes) multiply by the resistance (in ohms).

pneumatic

operated by compressed air.

pyrometer

instrument used to measure temperatures.

refractor

test instrument used to measure the strength of antifreeze or specific gravity of electrolyte in a cell of a lead/acid battery.

sirometer

test instrument used to measure RPM of an engine or frequency of a vibration with great accuracy.

UART

a protocol for communication between computer modules.

Abbreviations