The Internal Combustion Engine, Explained
The FC values are periodically checked for synchronization and if any ECU goes out of sync it is declared as un-genuine and therefore is blocked. The FC has a threshold parameter beyond which it resets to and begins to increment after again. Here the ignition on T15 starts the FC and the value gets stored in EEPROM. The engine ECU in most autos is connected to the on board diagnostic connector and will relay all diagnostic data on this line to all the other modules or ECUs. This reduces the amount of wire required and you do not have to...