This is a copy of a post by Brutal which I saved on my x350 memory stick:
Garage is empty, add now
Join Date: Sep 2008
Location: SUGAR LAND/HOUSTON, TEXAS
Thanked 577 Times in 442 Posts
you dont need IDS or to go to the dealer. You pin the signal wires with a dvom and turn it(the TPS) to get a .6volt reading at idle. And yes you dont need the engine running or the throttle body on the car. Just the sensor hooked up and the key on, and throttle at the idle position. You can turn the TB over to access it easier.
I havn't seen him round for a while!