Originally Posted by
1project2many
A definition file is essentially a map of the calibration. At a minimum it will include a location in the calibration file, a description of what data is at the location, and a formula or method to turn the data into numbers more easily understood. It's kind of like a super-secret decoder ring. An incomplete definition file is missing some of the map information. This means that (1) you will not see all of the data points that can be altered, and (2) the calibration file is unaffected. Most definition files are incomplete as some information just doesn't need to be accessed, some information is still undefined, and some folks don't want to deal with too much info. If it turns out that you need to alter a setting that isn't included in the definition file, then it is possible to add that setting to the definition file.
Think of the definition file like a set of magic wrenches that only let you see nuts and bolts that you already have the right wrenches for. The car won't fall apart just because you cannot see all the nuts and bolts. But you may not be able to adjust more complex things unless you add new tools.
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