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Message: [QUOTE="cleatus12r, post: 1540713, member: 18093"] Let me see how easy I can make this. The definition file is used by the tuning software to decode the hexidecimal values in each calibration file. Ford changed the addressing of the data in the calibrations (the data determines every aspect of what makes everything happen and when) so it takes a particular "definition file" to make the addresses "line up" when either the PCM reads it or the tuning software is used to "see" it. In this example, PMT1 uses VRAA6 (as its strategy or "hex" name is VRAA6S3) and PMT2 uses VRAA7 because the strategy name is VRAA7S5. Both of these calibrations can be opened and viewed with either definition but a lot of the information that will be witnessed in the software (GUI Graphical User Interface) will be gibberish as the addressing for the data is offset differently and the information is useless and cannot be accurately fiddled-with. [/QUOTE]

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Loved driving through BC.

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