Read Freeze Frame
In most cases, the stored frame is the last DTC that occurred. Certain DTCs, which
have a greater impact on vehicle emission, have a higher priority. In these cases,
the freeze frame will record the top prioritized DTC. Freeze frame provides a
snapshot of critical parameters at the moment DTC is set.
This function is not supported by all models, and the option of freeze frame is not
available in these cases. Also, data recorded varies across brands and models.
Figure 3-11 Sample of freeze frame screen
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
scan tool can request information or command a module to perform specific tests
or functions. Some manufacturers refer to the bidirectional controls as function
tests, actuation tests, inspection tests, system tests. Reinitialization and
reprogramming would also be included in the list of bidirectional controls. Most
enhanced scan tools also can actuate relays, injectors, and coils, perform system
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