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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
◼ 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.
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