ECU diagnostics

[NissanGQ4.2]

first things first I had no idea that a 92 gq had this capability, so after reading this thread I thought I'd look into one of these eletronic diagnostics thingys since I drowned my truck in a river and have all sorts of electrical problems now lol
Can you guys make it clear for me...
You buy the cable that plugs from your truck to your laptop
Download free software that tells you whats wrong???
then go get it fixed

cheers and beers

You can read certain information from the ECU and its easier to read fault codes using software and a laptop, I would not say it tells you everything that is wrong, I have not really played with mine 2 much. But for the price i think its worth getting one, you can get a cheap one like i did, or go something a bit pricier and have a permanent readout display mounted in the vehicle