car problem

Maybe you can help me? ________________________________________ Hello,everyone, I'm a owner of mazda6.somedays ago I bought a diagnostic tool- Ford&Mazda Incode Tool for my car from Elegogo Electronic Co.,Ltd. Because I known it from my friend and I have never known this kind of product...

I have a 1997 Jeep Cherokee Sport SE, 4 door, 4.0L v6 It won't start, it'll turn over but that's it. I just bought a brand new battery and it still won't work so that's not the problem. It worked fine the day before but I went to turn it on in the morning and it wouldn't start. And my Jeep is...