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31
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.
Fig 4-10 click on Continue to complete the 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.
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