Just saw a question that triggered another thought/question.

At least with my '165/6E setup the ECM has injector values compensated for by system voltage. Obviously the vehicle runs ~12V normally.

I know some of the sensors (TPS?) use a 5V reference.

How much voltage does the ECM/PCM circuitry "want" to properly run? I was just thinking it would be odd that the ECM/PCM would be a 12V device, yet only compensate for injector PW under that voltage...I would think everything would start to skew as voltage went down?

Not really going anywhere with this, just a question. I've had an alternator die before and didn't notice anything until I got down around 10V, but the truck didn't run any worse, and I just happened to notice the gauge before things started not working right.