GMC Tech 2 User Manual page 88

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SECTION VIIC SERVICE PROGRAMMING SYSTEM
Selecting the Right Calibration
When reprogramming a vehicle, selecting the right calibration is critical. You will only see calibrations that
are valid for the VIN entered. Be sure to check the history of each calibration. The history lists an
explanation of the calibration file, telling what the calibration is for and whether it supersedes any other
calibrations. It is helpful to read the latest bulletins to stay up to date on why certain calibrations have been
released. Related bulletin numbers are sometimes listed along with the calibration files.
Based on the calibration history and bulletins, select the appropriate calibration file. For many vehicles
equipped with VCMs, you'll also need to complete the multiple tab selections. Each tab is for a distinct
calibration file contained in the VCM. An unchecked box on a system tab indicates that a necessary
selection has not been made.
If you need a VCI number, contact the Techline Customer Support Center (TCSC). Once you have the VCI
number, it must be entered in the entry screen when requested by the SPS.
The four main SPS methods are:
• Remote Programming
• Pass-Thru Programming
• Off-Board Remote Programming
• Off-Board Pass-Thru Programming
For a complete representation of the Tech 2 interface screens while performing remote SPS, see Tech 2
SPS User Interface Screens and Functionality on pages VII-47 to VII-49.
Regardless of the vehicle involved, the general three-part process for SPS programming is as follows:
1. Check the vehicle's control module to determine which, if any, calibration file is currently stored.
2. Determine if an update is required.
3. Transfer the selected data to the vehicle's control module.
2005 Tech 2 User's Guide VII - 38