Some scan tools that connect to the internet also offer programming capabilities. The laptop (figure 1 ) doesnвЂ™t need to be anything fancy. WeвЂ™ll start with hardware: YouвЂ™ll need a computer (preferably a laptop), a J2534 pass-thru device, a battery maintainer, and quality cables for connecting the computer to the pass-thru device and the pass-thru device to the vehicle OBD-II connector. LetвЂ™s take a look at what tools youвЂ™ll need to make this happen. Depending on the pass-thru device manufacturer, you may be able to reprogram other modules. This standard applies only to ECMs, TCMs, and PCMs. This opens the door to electronic tool manufacturers to create an interface - also called a pass-thru device - at a fraction of the cost of the OEM tool, with universal coverage. It also mandates that manufacturers make programming packages available to the aftermarket. It allows the aftermarket to access and program vehicle computers the same as OEM, without needing the OEM tools. It sets the guidelines for vehicle programming, data acquisition protocol, and communication standards. So letвЂ™s take a look at the world of do-it-yourself programming using the J2534 tool.Д«y now you might be asking yourself вЂњwhat is J2534?вЂќ J2534 is a standard that was developed by the SAE (Society of Automotive Engineers). Getting the initial mechanics of the process can be challenging, but with practice, attention to detail, repetition, and continual reading to stay updated on procedures, it can become as easy as building a 4L60E. In a way, itвЂ™s a lot like any other skill: ItвЂ™s going to take work to get good at it. If you think it is, youвЂ™ll surely be disappointed after your first failed attempt. LetвЂ™s get one thing out of the way up front: Programming isnвЂ™t easy. How do you know for sure that they programmed the computer? Without research, you donвЂ™t, but now you can take programming into your own hands. We cringe at having to rely on the dealership or a mo bile programmer to perform whatever programming needs to take place.ДЄll you can do is hope that the transmission will shift correctly after all is said and done. We continue to deal with the question of whether the computer needs to be programmed, reset, or replaced. Now weвЂ™ve been forced to address them when diagnosing and repairing transmission issues. Then we watched them enter our world, one solenoid at a time. We dismissed them as electronic gizmos that were all about engine control and had almost nothing to do with the transmission. We stood by for years without having to worry about computers in cars.

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