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Title: 0261203968/969 OBD2 M3.8.1 Mk3 golf VR6 Post by: c11rgd on June 19, 2014, 03:21:03 PM I have the same issue, ECU 0261203968/969 OBD2 M3.8.1
The Eeprom 24C02 chip is on the underside of the PCB under the plastic shield. Im guessing its the same method as Mk4 golf AGU Ecu, unsolder the immo and read the eeprom. then edit. Can anyone else confirm this please? Title: Re: 0261203968/969 OBD2 M3.8.1 Mk3 golf VR6 Post by: tjwasiak on June 19, 2014, 03:26:59 PM Yes it is proper way to deal with immobilizer - desolder, read/write, resolder. If you have proper programmer you might succeed in reading/writing without desoldering.
Title: Re: 0261203968/969 OBD2 M3.8.1 Mk3 golf VR6 Post by: eliotroyano on June 19, 2014, 06:10:06 PM If you have proper programmer you might succeed in reading/writing without desoldering. Do you mean UPA reader??? Title: Re: 0261203968/969 OBD2 M3.8.1 Mk3 golf VR6 Post by: tjwasiak on June 19, 2014, 07:31:04 PM I did not mean any device but heard some people did it without desoldering. Desoldering PSOP8 is not that big deal for me so and I have only a Willem...
Title: Re: 0261203968/969 OBD2 M3.8.1 Mk3 golf VR6 Post by: aef on July 04, 2014, 05:24:36 AM Is there a way to test it afterwards on the bench? Like channel 91 at the M3.83 ecus
Title: Re: 0261203968/969 OBD2 M3.8.1 Mk3 golf VR6 Post by: aef on July 30, 2014, 09:01:10 AM Just opened the ECU to desolder the 24c02 but there is only one little thing with 8 legs.
Are these two sealed ones 24c02 too? looks nor original... :'( https://www.dropbox.com/s/8m84d4x1vee16qk/Foto%2030.07.14%2017%2044%2008.jpg https://www.dropbox.com/s/i0amip9jnjd266u/Foto%2030.07.14%2017%2043%2054.jpg Title: Re: 0261203968/969 OBD2 M3.8.1 Mk3 golf VR6 Post by: aef on August 02, 2014, 08:47:46 AM Okay, i was able to get rid of the epoxy sh*t by a little bit of hot air station love.
(http://abload.de/img/epoxy2y3ox9.jpg) (http://abload.de/img/epoxy1fxqkv.jpg) i desolderen both chips and hope thy are both 24c02 the first one on top of the board looks like this and was all 00 (http://abload.de/img/toppno7c.jpg) the second one under the board looks like this and the file is attached. (http://abload.de/img/underside8rq0h.jpg) the file itself looks strange and little bit empty. (attached) Title: Re: 0261203968/969 OBD2 M3.8.1 Mk3 golf VR6 Post by: aef on August 02, 2014, 08:51:48 AM here is the file
ecu looks like: (http://abload.de/img/stgnqx7t.jpg) any input here? I checked the immo like this one and it shows 0 (http://abload.de/img/wfsdeaktivierttfzug.jpg) i am not sure if this works on m3.8.1 ecus with external immo-box (immo1 i think) Title: Re: 0261203968/969 OBD2 M3.8.1 Mk3 golf VR6 Post by: eliotroyano on August 02, 2014, 09:43:44 PM Did you check this --> http://wiki.ross-tech.com/wiki/index.php/Immobilizer#Immobilizer_Generation_1 (http://wiki.ross-tech.com/wiki/index.php/Immobilizer#Immobilizer_Generation_1) ?? ?? ??
Title: Re: 0261203968/969 OBD2 M3.8.1 Mk3 golf VR6 Post by: ddillenger on August 02, 2014, 09:57:09 PM Should be this one:
Title: Re: 0261203968/969 OBD2 M3.8.1 Mk3 golf VR6 Post by: eliotroyano on August 02, 2014, 10:00:14 PM Should be this one: Yes should be it. Also check eeprom marks. Title: Re: 0261203968/969 OBD2 M3.8.1 Mk3 golf VR6 Post by: aef on August 03, 2014, 03:40:11 AM Hi,
i dont think that this is the right chip. Its B57554 which is a LM2903DR IC. There is no edge/dot in it find the top and bottom. I know that this is the spot where the early 1.8t m3.83 have the 24c02 located but on this ecu it isnt. I hope user c11rgd will chime in here. Title: Re: 0261203968/969 OBD2 M3.8.1 Mk3 golf VR6 Post by: aef on August 05, 2014, 10:28:06 AM Okay so i got a file from another board which should work. Adaption channel 91 (immo related) turned from 0 to 1 which means immo is off.
attached both files and the before and after screenshot. time to find out what is responsible for immo and what changed the numbers for WSC/GarageID |