Vivid shows 5 wires but I have a leaflet from a Snap On seminar which shows a 6 wire terminal (for a Bosch LSU 4.9) but has no colour code for term 5. I do remember that the colours changed at the terminal. I can't remember what AD has as I am not in workshop at the moment. Will have another look at what I have during the day. In the meantime have a look at this. It shows the ref: voltage as 450mv but I am sure that this sensor is about 2.5V.
http://wbo2.com/lsu/lsuworks.htm
Looking at that it seems that it is probably the red wire which switches pos/neg and the yellow may be the feedback? A bit of probing with the scope and I was able to work it out but I am also a bit weak on electrics.
This give limited info.
http://www.bosch-motorsport.de/pdf/sensors/lambda/LSU49.pdf
HTH's, Bryan.
