OK, found it. Open the Manual that was posted on this forum...its the "tirepres.pdf" file.
It says the tire pressure monitor ECU calculates the tire inflation pressure based on the signals from each speed sensor. It uses a relative wheel speed difference method (Rolling radius difference method) If this method detecs a drop in the tire inflation pressure, the tire pressure monitor ECU outputs a warning signal to the combination meter in order to warn the driver.
Says it utilizes the changes in the actual radius of the tires that result from a drop in the tire inflation pressure. When the tire inflation pressure drops, the actual radius of the tire decreases and, as a result, the wheel speed increases. The tire pressure monitor ECU compares the speed of each four wheels, and detects a drop in the tire inflation pressure from their difference.
Says this may not function properly in some circumstances:
* on slippery surfaces (guess in the cause of tire spins)
* rapid acceleration/deceleration or sharp turns is continued (I guess normal turns are OK, the system can adjust or something for it? but a long turn would signal a possible problem?
* After rotation of tires if initialization wasn't done correctly
* And other cases too
Still doesn't REALLY answer the question about the turns...can anyone more knowledgable than me (pretty much everyone) about cars explain maybe how they account for that?