computer reset question

How long does the Neg. battery cable have to be disconnected in order for the Computer to be reset?


also is there a way for me to pull any trouble codes myself without those fancy handheld computers.

blazerLT told me too leave it off for aleast 5 min but also pull the fuses out 1st i know i have 2 - but it depends on what yr you have-i know in early blazer models you could loop the system with a pair of jumpers but other than that i say go to autozone and they'll do it for free