I hope most others with the capabilities feel the same.Tire Tread Depth Gauge (digital tread depth gauge) Description digital tread depth gauge features Mileage corrections is a common practice in the aftermarket auto world and I can't speak for others but for moral reasons I only change mileage when installing a donor cluster or my client has proof they have previously installed a donor cluster already. In my state at least, the only regulatory issues that I know of is if the seller of the car purposely reports the mileage incorrectly on the title with dmv. "Mileage correction" Its not something manufactures/official dealers support. In some of the newer models like chevy cruze where the main mileage is stored in the BCM it may update the mileage for you by taking it from elsewhere in the car when doing replace & program" but its rare that ANY factory tool will set or change mileage shown even when replacing components. SPS access is for updating the flash programming of modules and generally does not effect any eeprom memory area's like where mileage is stored. GM does not store any information about your VIN other then what options it had during manufacturing. GM, for instance is making the EEROM flashing available by subscription or for say a 3 day period. That info may also only be allowed with a manufacturer specific tool.The chassis is probably the more important unit to consider when thinking of the wear and tear put on by high mileage. Also just changing your ECM does not make it ok to lower the mileage of the car. There are some cars that store mileage just as a reference in ecm's that you can change if you want but it has no effect on visible actual miles of the car. You do not change the mileage when changing ecm's. "When an ECM is changed, then and only then can the odometer be changed, because those ECM's are "virgin".Ones that do not store in cluster are usually controlled in the bcm. but these will only be visible by scan tool. Some cars also store secondary mileage in other places like the the ecm, bcm and bmw's even the keys. The majority of cars the mileage is indeed stored inside a eeprom in the Instrument cluster. You can post data here.Ĭlick to expand.I know this post is very old and I am sure TS has found his answers but reading it after it popped up under another thread I felt the need to chime in here for any future readers about the post above as not much in it is accurate. Some are very simple like bitshifting (ROT13 or such) or inversing. Most often it is stored multiple times in different "codings". If the result in EEPROM is still the same like the last read, there is a good chance of a static algo without any seed (like time or random) and you can start reverse engineering the data. Then drive again one mile and read again. Next, try to reprogramm the old value and look if it shows the old mileage. The differences should show you where it is stored. Read the memory, drive for a mile and read again. But this is only detecable by an OBD reader.ĭecoding (aka hacking) the mileage bytes inside the EEPROM could be very difficult. Modern cars do store the cars mileage in multiple modules, not only into the IPC. I do not believe that VIN is taking place in coding the mileage, because this would prevent so use the device in any other car. On main process in replacing an IPC, because of an broken one, is to set the mileage to the correct value after the new device is fitted.Īlso it is much easier to clone an EEPROM from an IPC whith less miles than to change the value in an existing one. It's only illegal to use a wrong mileage in car which has more -) There is nothing illegal in changing the mileage in an IPC, even selling this. Also is there a way to convert the cluster from kilometers to miles without messing with the mileage code but maybe the VIN or some other piece of code in the cluster? We do send them out for this service but i am trying to learn to do it myself.I have not been able to read the chips without de-soldering them first and also if there is a way to bench test the cluster so i can read the mileage at the bench.so any insight on those subjects is greatly appreciated.that being said do you have any recommended software that will help me decode the hex so that i can identify the mileage code and make the corrections. I am able to transfer the code but i have not figured out the coding needed to correct the mileage.everyone is skeptical because of the obvious legalities involved but we are a legit business importing cars from Canada to USA and we must convert the clusters to American. i too am trying to transfer the info from one cluster to another for legitimate purposes.
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