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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.
◼ 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.
Take Renault Duster ii ph as an example, after selecting the system to enter
the lower freeze frame menu, the device will list all the fault codes under the
system.
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