355 TPS sensor schematic?

I dont' have a schematic, but it should be a trim-potentiometer. This puts power in the middle pin, then an output at either end. Usually one varies with the turning of the potentiometer, and the other is either on, off or disconnected.

I think if you set your ohm-meter to th 1 Kohm scale, put the red lead on the center pin, the black lead any end pin, and move the screw you should get one of two results: 1 a variable result = you found the data line to the ECU, a binary result (off until the crew is turned all the way towards the pin) = you found the WOT position pin,

You can however do a search for the BOSCH part number and hit a datasheet somewhere.

Marco