At a guess I'd say:
- +5V supply (common to other sensors, like AFM, trace it out)
- Ground (brown)
- Signal (0-5V) depending on throttle position (check resistance bewteen pins with a multimeter as you move the throttle to find this one)
- Idle (gets 5V only when throttle fully closed) (again check with a multimeter)
However surely the wiring diagrams floating around the net have all this info on them.
Hen