just wondering have you opened up the TCU -- reguardless weather or not your getting an entirely different code of VSS you never know it could look like this the same problem your having ive had and with codes that had nothing to do with the TCU until i found this you have too options either get another one from the jy and it will fail sooner or later like my jy one did or as i did later on just got to radio shack and solder in new ones with as close to values as you can find i did it and have not had any problems for 6 months 
just saying
just saying
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