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Title: Possible to replace an 800BB chip with a 400BB? Post by: GWerks on October 23, 2013, 07:52:06 AM Hey guys,
I recently flashed a MK4 GTI ECU (HJ box) with a file without doing the checksums and haven't been able to restore it so I bought a new ME7.5 ECU, my surprise was that went I opened it the chip in it was a 400BB chip, now, if I defeat the immo on this 400BB ECU, can I flash it with the HJ box .bin file and run the car? Thank you, GWerks Title: Re: Possible to replace an 800BB chip with a 400BB? Post by: ddillenger on October 23, 2013, 09:04:44 AM 29f400bb ecu's are narrowband.
29f800bb ecu's are wideband. Besides the fact that the 29f400bb is only a 512kb ecu, it doesn't have the hardware for the wideband. In short, not a chance. Title: Re: Possible to replace an 800BB chip with a 400BB? Post by: coreyj03 on April 14, 2014, 12:31:12 PM What about the reverse? flash 400bb file onto 800bb ecu? i could solder in a 400bb chip if necessary
Title: Re: Possible to replace an 800BB chip with a 400BB? Post by: ddillenger on April 14, 2014, 12:39:38 PM Yes, you can do the reverse, but it wont change anything. You still have to run the 29F400BB file and fill the empty space on the chip with either FF's, or double the file.
Adding a larger chip won't allow you to run the newer files as the ecu is still not wideband compatible. Title: Re: Possible to replace an 800BB chip with a 400BB? Post by: coreyj03 on April 14, 2014, 12:48:39 PM reason i ask is because i have a customer who has a 2000 audi TT with narrow band ecu the has a checksum error . audi dealer wanted to replace ecu, i told him i could reflash it. so i did and while i was in there i changed a few maps for some more power as he requested with winols. it was fine for a few days now he says the CEL is back on but i haven scanned it yet to see the fault code is( hopefully its not checksum error). but just in case it is, i wanted to replace the ecu , but i dont have any 400bb narrow band ecus, however i have a stack of 800bb wide band ecus i could convert to narrow band .bin file if you are right ddillenger.
Title: Re: Possible to replace an 800BB chip with a 400BB? Post by: ddillenger on April 14, 2014, 07:04:23 PM The 29F800BB and 29F400BB ecu's are different. One cannot run the software of the other regardless of what you do.
Title: Re: Possible to replace an 800BB chip with a 400BB? Post by: _nameless on April 15, 2014, 09:04:24 AM reason i ask is because i have a customer who has a 2000 audi TT with narrow band ecu the has a checksum error . audi dealer wanted to replace ecu, i told him i could reflash it. so i did and while i was in there i changed a few maps for some more power as he requested with winols. it was fine for a few days now he says the CEL is back on but i haven scanned it yet to see the fault code is( hopefully its not checksum error). but just in case it is, i wanted to replace the ecu , but i dont have any 400bb narrow band ecus, however i have a stack of 800bb wide band ecus i could convert to narrow band .bin file if you are right ddillenger. post your tt file and i will correct checksumsTitle: Re: Possible to replace an 800BB chip with a 400BB? Post by: ddillenger on April 15, 2014, 09:32:50 AM post your tt file and i will correct checksums Not all checksum errors can be fixed. There's a point where the hardware fails and causes this. Title: Re: Possible to replace an 800BB chip with a 400BB? Post by: coreyj03 on April 15, 2014, 11:58:55 AM post your tt file and i will correct checksums this is not my problem, i can correct checksum with winols. turns out it was an evap error, so my reflash of ecm fixed checksum error so far. i work for VW so i run into checksum error all the time on newer cars, and solution is to replace ecm, techs dont have access to reflash ecus unless it is a recall/update with a 4 digit update code for online server reflash. only vw engineers have this capability. Title: Re: Possible to replace an 800BB chip with a 400BB? Post by: coreyj03 on April 15, 2014, 12:02:13 PM The 29F800BB and 29F400BB ecu's are different. One cannot run the software of the other regardless of what you do. i understand what you were getting at now .thanks for info. |