Today, almost all PCMs have reprogramming capabilities so changes and upgrades can be made if needed.
GM knew OBD II was coming and that it would require a new generation of PCMs that were faster, more capable and able to be programmed electronically.. That's over 100 million vehicles that have been built since 1996 WHY REPROGRAM?As we said earlier, PCMs may need to be reprogrammed for several reasons.. One is to fix factory bugs Every time Windows OS or a new phone for example, comes to market, it they always turns out to have bugs and security holes that were somehow missed but must be fixed by downloading and installing the latest patch.. Performance enthusiasts also liked replaceable PROMs because the chip could be replaced with one that provided more spark advance, fuel enrichment, a higher rev limit, etc.
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PCMs built with EEPROM chips can be reprogrammed in a matter of minutes without having to remove the PCM or replace a single chip.. A replaceable PROM chip also meant the PCM could be 'retuned' if necessary to correct certain kinds of emission or driveability problems.. We're talking thousands of different PROMS The General Motors PROM Identification manual that OTC used to provide with their Monitor scan tool and Pathfinder software contained over 362 pages of GM PROM numbers! Enter the flash reprogrammable EEPROM (Electronically Erasable Program Read Only Memory) chip. Change Default Apps On Macos
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Apr 08, 2009 Read about how Tony Duncan reporgrams the computer on a 1973 Chevrolet Corvette to improve its' overall performance.. GM pioneered the replaceable PROM chip as a way of programming a limited number of basic PCMs to fit a wide range of GM makes and models.. Up to this point, Program Read Only Memory (PROM) chips held all of the PCMs vital calibration information and operating instructions.. It also meant that if a bug was later discovered in the original factory programming, it could be corrected in the field by simply replacing the original PROM with an updated corrected PROM (a tactic GM has successfully used over the years to fix many factory flaws). Bookworm adventures full game free download
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Why a humdrum car like the Storm would be the first to receive a flash reprogrammable computer system is unknown.. , to squeeze more power out of the engine But replaceable PROMS had a serious drawback: there were too many of them! Every model year and every running change meant another PROM had to be created.. Every field fix or recall for an emissions or driveability problem created more part numbers to keep track of.. You can learn how to do it yourself with these easy steps FLASH REPROGRAMMINGWould you believe flash reprogrammable PCMs have been in vehicles for over a decade? The first such application was the 1990 Geo Storm.. You'd think GM would have chosen a more high profile vehicle like a Cadillac or Corvette to usher in the new technology.. It's all done digitally with the proper access codes and input data Following the Geo Storm, GM began phasing in PCMs with flash reprogrammable chips in a variety of cars and trucks. e10c415e6f Mac Os X Tiger Download