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each car , each manufacture has different , methods and designs.
you can get a FSM on fleebay and never need to talk to Chev again.
become self sufficient.
Not to mention, Chev. forums galore. and ALLDATA.com
teach a man to fish..... and all that.....
Keep in mind there are 2 sides of the OBD2 spec.
side one , we all play in .
side two, the OEM side , locked out to us.
get on the chev. forum and join, then post this question.
also it depends on the year the car was made.
before you start popping this and that off, keep in mind , if you have air bags , you just might be in for a surprise.
on newer cars, step one is " read page 1 in the fsm" tells how to defeat the airbags."
goggle mechanics dead from air bags.
safety first.
not discouraging you , I have 1 car running on a Megasquirt MS2v3.
cheers
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