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Originally Posted by ProwlerGT
Gotcha now. Its the one opposite of the GREEN one I have highlighted there. I didn't get the acronym abbreviation before because the manual refers to this sensor as: Crankshaft POSITION Sensor and not "Angle" - Either way we're talking the same sensor now. I feel good to know that you've done this before and it didn't break anything. lol - I read that it controls timing n such.... I have a lack of understanding about it, but it seems like if you pulled the CAS you'd mess up the timing aye? NO?
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It sends a signal to the ECU that the ECU uses to determine the position/angle of the crankshaft to determine when to send the signal to the PTU (power transistor unit) that controls the ignition coils that send power to the sparkplugs, so yes, the ECU uses the signal to know when each cylinder's piston is near TDC and thus govern ignition timing.
No signal from the CAS = ECU has no idea what position/angle the crank is and consequently no idea which piston is at TDC, so it cuts any signal to the PTU and also cuts signal to the injectors. Giving fuel and spark to an engine when you have no idea where the piston is in the cylinder and whether it's headed up or down is a bad thing so our ECU's were made smart enough to avoid this.
BTW, to clarify, no it won't mess up your timing. 1) it's not something like camshaft timing etc which is mechanically controlled by your timing belt. 2) it's electrical ignition timing but the ECU is not going to change your ignition timing because you unplugged the CAS. It'll simply NOT provide any spark/fuel until it receives a CAS signal again.
So no, it won't hurt anything (unless you drain the battery flat going, "Hey this is cool,... I can crank the car over and over and it just won't fire up"). BTW, if you lived somewhere where you were deathly afraid someone would steal your car when you parked it and left, you can pop the hood and disconnect/unplug the CAS, but leave it still sitting loosely in the plug. The car will never start and I guarantee you that anyone looking over the engine bay to try to figure it out is not likely to notice it. Also a good way to give a friend with a 2G 3/S a heart attack if you feel like playing a mean joke.
Max