As far as the process of elimination work for electrical work. First you just dont go out and buy every part until its fixed as you may be replacing a $350 PCM, when a cheaper control box or part could have fixed the PCM. Then there is time and making sure you don't leave out the details. As electronics fail intermitantly and so they either performa below specification or they fail on and off arbitrarlly. A higher quality scanner will pick up other function faults with more sensitivity in changes and more informative, Also, trouble codes can come up as electrical components get out of specification. However a good gauge could tell you if that circuit with the problem has an intermittantly failing part that the other scanner did not chatch.
Sunday, July 15th, 2012 AT 12:33 AM