FYI only, I was finally able to get a succesful connection to the OBD system of my GTA. After trying several possibilities and some tinkering, the interface and software from http://www.obddiagnostics.com
initialized the OBD correctly and made a good connection. The protocol is ISO-14230-Fast. For some reason the first tests even with this device were not succesful, until I tried with another laptop PC, and voila! Here we go!
The interface cost only $98 (american $) and can do a lot of nice things (quote):
It allows you to read out trouble codes when your "check engine" light comes on. You can also clear these codes. You can retrieve pretty much any piece of OBDII mandated diagnostic data from your vehicle.
So what, you ask, where's the big deal?
For me it's two things that I'm after, both based on the ability to record log files during the real test runs:
1. I'll now be able to establish a concrete, measured baseline for my cars performance. I'll then be able to use this baseline to compare any possible modification that is made. Whether I decide to chip the ECU or change the air filter, silencer, whatever, I'll be able to exactly
know what was the real measured
effect. I know, sad, you say
2. I'll be able to follow the evolution or degradation of the performance during the time. In case of any engine problems, I'll now be able to make the first checks myself and see if ECU reports any error codes or if there is any noticeable change in the operating parameters (compared to the known, well behaved baseline) - and this is something that even the official Alfa garage is not able to do, they do not have/keep baseline records of my specific
I'll try to attach first few screenshots, yet don't know how I will succeed...
And BTW, my car is 2003 model and I do not have any idea if the interface works with other models. But I'll be probably able to test it with my friends 156 JTD soon (I think it's 1999 or 2000).