As with any software and hardware configuration, you have to make sure that your laptop meets the requirements for the OE that you are working on. Some OEs, including GM, BMW, Jaguar, Toyota, Volvo and VW, use the J2534 interface not only for reprogramming but provide full factory scan tool functions through the device as well. The J2534 tool is then connected to the vehicle Diagnostic Link Connector (DLC) and the data is transferred to the ECM. Pass-Thru reprogramming dumps software downloaded (or CD, old style) to a laptop from the OEM service site on the Internet to the J2534 tool. J2534 was created for aftermarket shops as a means to repair vehicle emissions systems without purchasing the OE scan tools. It sometimes goes by different names like ECU reprogramming, flash programming, Pass-Thru programming, calibration updating and software updates. J2534 is the regulated standard for installing software in onboard light duty vehicle computers. Since we are concerned with today’s software reprogramming issues, we will discuss the generic J2534 unit and how and why to use it. The purpose of the MemCal PROM then and reprogramming today is to update the Engine Control Module (ECM) with the most current information. In the 1980s, most likely you worked on GM vehicles and changed a MemCal/PROM or two. Believe it or not, reprogramming is nothing new.
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