Car companies are relying more and more on flash reprogramming to correct driveability and emissions related problems in newer vehicles. This procedure is usually done at a new car dealership, but with the right software and tools independent repair shops or even individuals can reprogram their PCM Powertrain Control Modules (PCMs) and other onboard electronics.
U.S. Environmental Protection Agency regulations require original equipment manufacturers to make emissions-related onboard diagnostic service information available to the aftermarket via their technical websites, including updates on reprogramming vehicle modules. The flash reprogramming procedures must conform to SAE J-2534-1 standards, which allow the use of aftermarket scan tools or similar pass-through devices in addition to the factory scan tool.
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If a PCM, TCM, BCM or other control module is being replaced on a vehicle, reprogramming may be required to calibrate the new module to that particular vehicle (unless it has been preflashed by the OEM or module supplier). Also, additional learning procedures may be required to "initialize" the module so it will function properly.
The new SAE J2534-1 v 05.00 specification addresses issues of incompatibility of some J-device flash reprogramming tools with current vehicle applications. The latest specification more closely defines reprogramming criteria to reduce ambiguity that can lead to flash programming issues on some applications. The new SAE J2534-3 Compliance Tests will assure that scan tools and vehicles meet these criteria so vehicle PCMs can be flash reprogrammed with fewer problems. The new spec also allows ISO 15765 CAN to have multiple 'Logical' channels and adds support for full and half-duplex functionality that can facilitate much faster reprogramming times. 2ff7e9595c
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