[svxistentialist]

OK guys, I have checked on the wiring, and the voltages are as I surmised from looking at the wiring diagrams.

Essentially, there are three wires to the TPS as many of you know. The black one is an earth, the red one is a 5v feed to the TPS from the ECU, and the white centre one is the variable voltage signal wire out from the TPS. This feeds back to the ECU so the ECU can make calculations based on how fast and how far the throttle is opened, and manage the fuelling accordingly.

There is a white wire tapped from this feed to the ECU that goes to the TCU at B67, pin 8. Your TCUs in the US are set up the same as the UK and Euro versions. It will assess how much demand for overtaking speed is required, and switch on the Power mode map if beyond certain parameters.

When this Pin 8 gets the full voltage, about 5v at WOT, then Power mode is engaged.

To be continued...