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Old 01-02-2004, 07:41 PM   #1
robcarync
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i was looking to buy a used BavAuto performance chip from someone, but ran into this problem:

Quote:
EWS-II is a security feature on all BMW automobiles manufactured from January 1, 1995 to present. Basically, the E-Prom in every ECU has its own security start code. If this code is not overlayed onto your new chip, your vehicle will not start
so i couldnt just pop his chip into my car...but would it be possible to swap the whole ECU since the ECU is where the start code is? would it change anything in my car?

thinking about it logically, id think that they would be the same ECU and the only difference would be the chip...and i would get the performance from the chip without anything else changing...but i dont want to try this and have my whole car disabled because it decideds to disable itself...


the secutiry start code in the ECU, is it used anywhere else in the car, because i dont want to have the ECU code change and then have it not match up with other parts of the car if it is used in other parts...

so ECU swap, would it work? or should i just keep saving to buy a new chip?
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Old 01-03-2004, 06:49 AM   #2
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well im not buying the chip...but still curious if it is possible to swap an ecu...hypothetically speaking since im not trying to find ways around the EWS-II security code anymore
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Old 01-10-2004, 12:26 AM   #3
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ECU and EWS are seperate items (boxes) in an OBD-II car. Changing the ECU is the same as simply changing the chip.

All that needs to be done is to have the ECU and EWS 'alligned' at a dealer. This is the only solution, short of disabling the EWS system completely. Most dealers will not do this allignment, so check around first.
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