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Figure 4-14 Sample of the PIDs Combination
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Actuation Test
The 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.
