RE: How this self-healing material can sense when there's trouble
The Cyberdyne Systems Series 800, Model 101, otherwise known as the T-101 (Arnie) was *NOT* self healing. It had redundant systems and could continue to function depending on the amount of damage sustained, but as more damage occurred, it became less functional.
Now, the Model T-1000 is made from a nanomorph mimetic poly alloy substance that can reform from most damage. This terminator, along with the T-1001 and the T-X all have this similar morphing/healing ability. But we need to be clear...the T-101 series 800 terminators could only heal their external skin, not their mechanical skeletal structure. Nor could they heal the skin around their eyes.