Scan Data is a rapidly expanding database of good vehicle data. The scan tool and scope data has been downloaded from healthy vehicles allowing you to compare it to data you are capturing from your problematic vehicle
The data can be downloaded or printed out for easy comparisons and if the exact data your looking for is not available you can submit a data request form.
Don’t tackle diagnostics on your own.
Here's a typical upload of good data from a 2013 BMW 318d at idle.