Cadillac Powertrain Control Module (PCM) Tuning Discussion, Limitter adjustment/removal in Cadillac Engine Discussion; Originally Posted by Hogg
Guys have been using Tech 2 to load PCM's for years, before the times of TC2(specifically ...
When the calibration is downloaded from GM it is stored on your PC in a location. Each segment is stored as a special zip file with the segment # added to the calibration number. The special zipped file is transferred through or to Tech II or MDI and it must be zipped.
If you use TC and tune a single segment file then zip it, them make sure that the file number is the same and then replace the existing file with the tuned file TIS will load it through the Tech II.
If you monitor the "folder" that the zip files are stored in while doing a TIS flash and you see the cal pop up again you did something wrong. If nothing changes in the folder you did it the correct way.