Auditrigger research
Here I'm going to add info about som auditrigger research I have made. The so called 135 trigger system or (c270).
At first a began to look at this picture.
I then realize the home trigger have a frequency which is half of the primary trigger. That means if you superimpose the home signal over cranksignal you should in theory get a 135-2 triggersignal.
Small other things to notice:
1. Original home signal is inverted to crank-signal. Possibly for superimposing signals.
2. Same type of signal has been seen on Toyota 24/2 Distributor also with inverted "home" signal.
3. Small interference between crank and homesignal is no longer an object for filtering since they are merged.
I also find a schematic over a Motronic system from a Porsche with have a similar system (no Cam-trigger).
I copy the input circuit to pspice and began to simulate signals and as an output I got a 135-2 signal. I will describe this better later on.
I also have made prototypcard with components to test in a real car. More info to come.
Porsche motronic schematic:
http://www.vems.hu/files/MembersPage/MagnusKarlstrom/Motronic/ML31AUS.pdf
http://www.vems.hu/files/MembersPage/MagnusKarlstrom/Motronic/ML31DUS.pdf