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Fig 4-8
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Actuation Test
Actuation test, also known as bidirectional control, is a generic term
used to describe sending and receiving information between one
device and another.
The vehicle engineers responsible for designing computer control
systems programmed them so a scan tool could request information
or command a module to perform specific tests and functions. Some
manufacturers refer to bidirectional controls as functional tests,
actuator tests, inspection tests, system tests, or the like.
Reinitialization and reprogramming also can be included in the list of
bidirectional controls.