Originally Posted by MMZ_TimeLord
The actual wiring harness may only utilize 5 out of the 6 pin positions.
This is not uncommon in the auto industry.
EDIT: Connectors are usually manufactured with an even number of pins, in reality lots of circuits utilize odd numbers of wires into and out of components. The Service manual shows that pin #2 is not used.
That's good to hear. Btw, after I installed SD, the car does feel faster even though it isn't. I also need to re-adjust my driving behavior. It is quite sensitive to my foot. I notice that it drops a gear when I barely press the gas, and before I had to press it over 50% for transmission to drop a gear, so now I really have to feather my foot around that gas pedal.