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In the process of diagnosis, if the device shows “System is
OK” or “No Trouble Code”, it means there is no related
trouble code stored in ECU or some troubles are not under the
control of ECU, most of these troubles are mechanical system
troubles or executive circuit troubles, it is also possible that
signal of the sensor may bias within limits, which can be judged
in Live Data.
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. This
function is used mainly to judge whether these actuating
components of the engine are working properly.
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.
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
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