AMBIENT SENSOR: Describes a type of detection device that monitors changes in the temperature of the air outside the vehicle.

FAULT DIAGNOSIS: Describes the tracing of faults or error codes which can be determined by the in-built diagnostic system and an engine analyser.

FAULT MEMORY: Describes a part of the electronic control unit and of the diagnostic system that stores error codes to assist the mechanic in diagnosing problems.

FAULT READER: Describes a device used in conjunction with the vehicle's diagnostic system that provides a read-out of status of the various components.

FEEDBACK: Describes the information returned by a computer-controlled fuel system. The sensor measures the oxygen content of the engine's exhaust in order to keep the fuel-air ratio close to the ideal proportion for combustion.

FEEDBACK CONTROL SYSTEM(FCS): Describes a computer-controlled fuel system employing a stepper motor that controls air-fuel mixture by bleeding precise amounts of air (determined by the computer) into the main and idle system of the carburettor.

FUEL COMPUTER: Describes a device which continuously displays the amount of fuel used over the distance since its previous setting.
MANIFOLD ABSOLUTE PRESSURE MAP: Describes a system sensor used to update an onboard computer on how much pressure remains in the intake manifold.

ON-BOARD COMPUTER: Describes a computer used to control vehicle electrical circuits, and to process data gathered by it and passing it on to the relevant gauges on the instrument panel.

ON BOARD DIAGNOSTICS (OBD): Describes a unit whose role it is to monitors the information gathered by an on-board computer as well as relates to system responses for errors during normal vehicle operations.

ON-LINE: Describes a situation where a piece of equipment is directly incorporated into the on-board computer system.

OUTPUT DRIVER: Describes a transistor situated on the output control area of the on-board computer used to turn various actuators on and off

OXYGEN SENSOR: Describes a device that controls pollution through measuring the levels of oxygen in an exhaust stream.

RESISTANCE THERMOMETER: Describes an electrical temperature sensor whose sensing element is a resistor that provides an accurate indication of the temperature

SENDER: Describes a sensor unit that conveys information in real time on the state of health of an engine to either a gauge or warning light.

SWITCHING SENSORS: Describes sensors that turn on and off in response to specific conditions.

THERMOSTATIC COIL CHOKE: Describes a form of sensory device mounted on the carburettor that automatically controls the choke butterfly valve by sensing the heat of the exhaust manifold.
VEHICLE SPEED SENSOR(VSS): Describes a sensor set in the speedometer cluster that sends information on the vehicle’s current speed to the electronic control module.

SELF-DIAGNOSIS: Describes a function in electronic engine management systems where a test program monitors the system’s input and output signals, detecting errors and storing them permanently.

VOICE RECOGNITION: Describes the ability of an on-board computer to recognize a command spoken by the user.