Unfortunately, service technicians having access to this GM service are often unwilling to use it for an enthusiast because it requires the vehicle to be present for a connection to the OBD-II DLC. Gen III engine conversions always require calibration changes to a GM calibration, so this service is nothing more than a first step in preparing a PCM for an engine conversion. This service is limited to flashing on-board modules with the latest GM calibrations. Service technicians have access to the latest vehicle calibrations through an online subscription-based service. Occasionally, a vehicle may receive a calibration update due to an undesirable performance behavior noted by owners of similar vehicles. When an on-board module is replaced during service, the technician uses TIS2Web for service programming. GM repair technicians use a web-based subscription service to access on-board control module calibrations. Just as a new (or used) PCM installed into a production vehicle requires the latest GM calibration for that vehicle, a new (or used) PCM purchased for an engine/transmission conversion requires an initial calibration to be flashed into the PCM’s memory that closely matches the features of the vehicle. have different settings from one vehicle to another. Vehicle options such as air conditioning, electric fans, transmission type, throttle type, etc. Prior to use in a production vehicle, each GM PCM is flashed with a calibration specific for its application. You can copy and paste this link to share: SHARE THIS ARTICLE: Please feel free to share this article on Facebook, in Forums, or with any Clubs you participate in. For a comprehensive guide on this entire subject you can visit this link: LEARN MORE ABOUT THIS BOOK HERE This Tech Tip is From the Full Book, HOW TO USE AND UPGRADE TO GM GEN III LS-SERIES POWERTRAIN CONTROL SYSTEMS. The aftermarket offers all the tuning tools necessary for a successful LS1 PCM conversion. You may find that the best results involve a blend of tuning services at an experienced dyno facility and final do-it-yourself tweaking using a popular scan-and-tune software package. Although Gen III PCMs are powerful control modules, they are of little use without tuning software tochange engine (and transmission) operating parameters.
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