I would try to get a hold of a schematic for your vehicle. I have never troubleshot an ebcm. With a wiring diagram you should at least see all of what is being input to it. I'm not sure what other vehicles used the 3.5 V6 around the time of the aura but I would certainly search Google on that code and see what else comes up under GM for that code around the same time as your vehicle was produced. I think they ended up using the same power plant in the Chevy Malibu or Chevy Impala I can't remember which and I don't remember when that started.

I would say best bet is number one.... Find a schematic.

Sounds like the wheel sensor data is correct, so definitely need to know what the other inputs are and what it outputs to.

You may wish to post on Saturnfans.com . Much larger member base and many more people with field service manuals for all kinds of Saturns. Also many morons posting ignorant crap so be selective as to what you believe. The old guys with 10,000 posts tend to know what they're talking about.

 

Thanks derf,
I'll try your suggestion.
Right, no shortage of crackpots with only experience watching YouTube.