Modulating/referencing a square wave controlled solenoid in an automobile

Discussion in 'General Electronics Chat' started by gte, Jun 16, 2010.

  1. gte

    Thread Starter Active Member

    Sep 18, 2009
    I am trying to log variable valve timing signals on my oscilloscope with my car, and I'm wondering if anyone has done this and how they referenced the oscilloscope square wave signal to cam angle and timing.

    As some background, the ecu pulses a square wave signal to a solenoid which then uses oil pressure to move the cam gear back and forth. The cam gear is inside of an aluminum valve cover so it is hard to see what it is doing while the car is running.

    Here is what the manual has on it as well as two sample oscope screen captures that I took