BMW Repair: Frequency Valve On BMW 320i E21 1980, bmw 320i, mechanical fuel injection

Question
How do you detect the pulse signal from the ECU, on my car the blue/black wire to see if it is emitting a pulse sigal?  The black/yellow wire from the lambda relay, terminal 87, has power to it.  The frequency valve is not buzzing.  What is the problem and how do I correct it?

Answer
Wow your getting into it way to deep.Its a 320i.Chances are if its not bussing it doesn't work.Although any drivablity problem shouldn't start there. Mechanical fuel injection isn't the same diagnosis as electric fuel injection so you really need to go to the basics on this one.