Hi mucrod been a long time...
No the volo doesnt diagnose, just reads and modifies u really have no idea whats it doing besides some flashing lights.
I have the FS2-HHO fuel economy wise hasnt done a thing, but i think my o2 sensors are stuft hence why i want to check the ecu.
I know the volo does something as first it takes a minute after resetting the volo to calibrate itself then every few seconds the data light flashes, it never has had any read errors which would be shown by flashing the lights a certain way. Also i mainly got the volo to run e85, upon first filling up the car ran like it had a potato in the exhaust, after reseting the volo and letting it calibrate to the new fuel, the car ran normal had quite a bit more power, noticed when the wheels span when taking off, QUITE A BIT MORE POWER
but the fuel ecomomy was shocking ran out of fuel 5 ks out of robe only got 330ks out of the tank, but i didnt have the flexfuel kit installed just relying on the Volos remapping capabilities of detecting the extra octain.
So i do belive it does work.
I am waiting on the vp12 chip so ill do a quick swap over of the processor that contains the firmware and test the power difference.
Volo said the car is ISO i beleive it is to, but i think the ecu is protected, eg it needs to be woken up and match a few paramiters before it talks to any scantool, and ive read that its part of protocol to protect the ecu from easily being remaped with out certain codes to meet gov regulations with emisions.
Im gona crack it sometime. I have a cpu level programing and advanced electronics degree,
i havent used it for 10 years but it kinda helps to understand. Just wish i had the money to buy the test equipment so i can check the output wave and work out what the ecu is doing.
I have a feeling a vag/kwp2000 scan tool cable from chinavasion may do the trick, im playing around with the elm325 resoldering wires etc, when i get anoyed with the elm ill move onto something else, chinavasion seems to have alot that may help, and once figured out ill be working out how to have a inbuilt diagnostic system, eg DVD/GPS/CAR diag system. So i can check fuel consumption etc etc.
Its just a hobby, so im not really bothered how long it takes been on and off for 2 years so far if it wasnt for the port being not standard i would have had it all done by now :P