Having abandoned IDS diagnostics, and working through 'basics', I'm puzzled by a lack of activity at three of the four MAF wires. Over the years I have rarely had any issues related to MAF sensors. So, we have battery voltage at pin 2, but with my 'scope (IDS) I have no ativity at any of the other three. Datalogger shows a gentle variation of the signal at idle, which I am beginning to wonder if it is a calculated value, not a measurement. With no similar 'systemed' vehicle available to me for comparison, I am asking, what could I expect to see from one, or two, of those three 'dead' wires?