What does the ECU use EGT and CHT sensors for?

Jeff Blakeslee wrote:

That’s interesting data and seems pretty conclusive in favor of your position.  It just seems like the EGT would be an important data point for mixture control, but I guess manifold pressure and CHT can also tell the story.  Whenever the lane light is flashing it’s easy to think the engine is running rough, so maybe that’s what happened in my case when my EGT probe failed.     

I think it ignores CHT as well. But even if so your EFIS will still monitor it and can tell you if issues come up.

Can the EFIS impact the ECU behavior at all to adjust mixture or timing in any way like to tell it to advance or retard timing or tell it to run the mixture lean or rich?

This is a quote from Aviation Consumer, April 2012 reviewing the 912iS when first released.

"Speaking of sensors, there are a lot sprinkled around this engine. It has MAP and temperature sensors, EGT sensors for each cylinder, an external pressure sensor and even acoustic knock sensing, which Rotax says is installed but not yet programmed. That will come later, after more field experience. There are presently no CHT sensors, although that may come later, too. The primary performance feedback for the ECUs is EGT and power is calculated through a combination of throttle position sensing and MAP."