Does anyone know what the sensor is in the left cylinder head just behind the camshaft advance solenoid connector. It bolts into the head with two bolts and has a large, about 12mm, round connector on it. The wire looks like a coax cable and follows the main engine loom into the management center by the RH hood hinge. I have been unable to find it on any wiring diagram. It pulled apart when I went to unplug the wire and I would rather try to find it on line as opposed to my local dealer parts counter but first I need to ID the thing. The general appearance looks like some kind of magnetic pickup. Thanks in advance.