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25
*Note: When customizing the graphs, the number of PIDs selected at a time should not exceed 5
◼ 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.
Figure 4-16 Sample of the Actuation Test Menu
This function allows the device to send information to and receive information from, vehicle control modules.
For example, in the case of OBD II generic information Mode 1 (which relates to data parameters), the scan
tool user initiates a request for information from the powertrain control module (PCM), and the PCM responds
by sending the information back to the scan tool for display. Most enhanced scan tools also can actuate relays,
injectors, and coils, perform system tests, etc. Users could check the individual part to see what is working
properly by actuation test.
Figure 4-17 Sample of the Actuation Test
◼ Freeze Frame
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