I have to agree that throttle switches are something you rarely ever do on a white engine but you now have two systems that have picked up a code for a faulty switch. Ohm the damn thing out and see if you can catch it in the act and if so, stuff a new one in it. The method outlined in Vadis is to hook up the break out box and check voltages from the sensor, they should range from .5-4.2 volts. If you do not have all of this stuff on hand your next best approach is going to be to do a sensor sweep and past that a simple resistance check. On a sensor sweep an oscilloscope is hooked up to the two wires that go through the resistor in the sensor, you then open the throttle from closed to full throttle and take a look at your picutre. The O scope will plot it on a grid for you and it should look, more or less, like a diagonal line from left bottom to right upper corners on the screen. You are looking for what is referred to as "drop-out", these are represented in the O scope picture as a place where the line drops down to nothing (this would be 0 ohms), it is also possible to have it spike to infinite (or open) resistance. Past that you can hook up an Ohm meter and see if the numbers climb in a linear fashion or if they have spots where the numbers jump real high or real low.

That 411 code that you pulled when looked up on Vadis is actually one of three codes that go under the same number, if you had the factory tool it would give you a status message that would let you know "too high too low or open"

Clearing the codes, well you have figured out how to pull them, clearing them is just as simple. Once you have got the first code to flash out the second time, thus ensuring that you have read all the codes at least once hold the button down for 5 seconds and then release, the light will go out for 5 seconds and when it comes back on push the button down for another 5 seconds and then release. After you release it give it a couple of seconds and then push the button again to see if the codes cleared, if they did you are good, if not repeat it until it clears and pay close attention to your 5 second intervals.

Mark