MES:
I absolutely agree it’s a valuable tool in the tool box. That’s why I have it. But without the experience of working on vehicles and understanding how they work, it can potentially cause more issues that it’ll solve (a bit like using Google to diagnose medical issues). I’ve learned to fix my own, based on 40+ years of working on my own cars. Adam: are you planning to work on your car yourself? If no, then you don’t need
MES. But you do need a mechanic who has access to read the Fiat-specific information (so he needs
MES or it’s professional equivalents).
You make a quite profound point here. Probably most on here will know by now that I trained as a mechanic back in the early 1960s back then you were dealing with points type ignition and ACR type alternators - that is if it didn't still have a dynamo! We were very advanced in that we had a SUN engine tune machine - wow, that was the latest thing which let you set dwell with a meter which actually showed the degrees! It was housed in a very "Buck Rogers" type cabinet and everyone was in awe of it! The Garage just down the street had a British Crypton Tuner, which was the other big name, but did much the same job. These days a machine like that would be so simple to understand compared to todays equipment. If you really wanted to impress the customers, the SUN tuner had a cathode ray tube display - TV screen to you and me - on which you could display the coil HT performance as the voltage decayed on one cycle - a series of reducing oscillations - It allowed you to see if the coil was in good condition. You could also display dwell. It never failed to fascinate the more enthusiastic customers who would particularly ask for a "sun tune" to be performed!
As the years went by electronic ignitions and other electronic engine controls crept in until you have the situation we have today where electronics control everything. The last range of vehicles I worked on "in anger" was the Montego/Maestro and cars of similar age. I never went on training courses for them as I was mostly doing mechanical stuff. We had a man in the shop who did all the electronic stuff. However, over the years I picked up lots of incidental knowledge through working on the cars every day. Then, about 15 or so years ago - maybe more? - I bought my licensed VAG-COM (now VCDS) to work on my old 1.9tdi SEAT Cordoba and got a rude awakening when I found out I knew next to nothing about diagnostics. Over the years I "fiddled" away with it slowly learning more and, very importantly, learning what to expect a "good" reading is for any given component. VCDS is a very powerful package which does things I can't understand and it worries me because when you get deeply into coding etc you can do very "nasty" things, like setting a rev limit which can't be reversed - how would you feel if you set a max rev limit of, say 1500rpm, and found the engine then wouldn't rev over that limit? Solution? a new ECU - which costs plenty!
However I got good enough with it that I could do diagnostics and reset service parameters etc which meant I never had to hand it over to the dealer in all the 20 odd years I owned it. I've had
MES for about 8, maybe 10 years now? and it's not such a powerful tool as the VCDS is with the VW stuff. Also it doesn't have the separate generic OBD2 program that VCDS has which let me use it, in OBD configuration only - so rather limited in scope - on other makes, like my boy's Astra for instance. However it (
MES) seems to be much more "in tune" with my mental processes and has lots of helper info on the right of the page and I find it much easier to understand. I've learned a lot more since starting to use it. It's terminology can be quite "strange" - for instance, try finding Fuel trims using it? but by and large I like it a lot.
The point I make is that it's all very well buying diagnostic equipment, and I think
MES is possibly the best for our wee FIATs, but you'll get nowhere with it if you have no experience. On the other hand, if you're prepared to put the time in, buy some books and spend a lot of time on you tube looking at instructional videos, you can learn enough to sort most of the everyday stuff our wee cars are going to throw at you. Lots of people on here who are very happy to help too.