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I have never found the data refresh rate to be a factor that prevents diagnosis or repair.
While we would all like the ecm environment to be more imediate and versatile, the current technoogy for live data streams is extremely useful. You can take that data and map it for trend analysis and watch how it responds for action/reaction testing. Comparing the data stream sensor values to known and expected values tells us what the computer is using for its computations from moment to moment, and I can tell you from personal experience that such an approach is very effective when used within the entire scope of diagnostics.
By pulling any available codes and looking at the data, it is often possible to determine that the problem is not sensor or ecm related. That said, when there is a difference in behavior between a cold start and a warm start in a system where temperatures are measured and appropriate control commands are issued, the chances of a sensor/computer/actuator issue go way up.
By now, I would have not only pulled codes and mapped cold vs warm data trends and done any required pinpoint testing, but I would also have checked the fuel pump output under both conditions.
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