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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 4-16 Sample of the Actuation Test
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Freeze Frame
When the signal of the sensor is abnormal, the ECU will save the data at that moment
of failure to form a freeze-frame. It is usually used to analyze the reasons that may
lead to car failures.
The living data items supported by vehicles of different brands are not the same, so
the freeze frames displayed when diagnosing vehicles of different brands may also
be different. Some vehicles may not have the option of a freeze-frame which means
that the model does not support this function.
