How to Measure ECU Output?
I'm working on a 2010 Evora. Lots of solenoids, here, and most of them have the same configuration: The coil itself is wired to +12(ish) volts and grounded through the body. Easy enough to see if positive voltage is available. But the timing, or "actuation" of the solenoid is accomplished with another wire, which receives a signal from the ECU. What I want to know is if the solenoid is being activated at the right time, and the only way I can think to do that is to measure the signal from the ECU, but I don't know what I'm looking for. 12 volts? Am I even measuring voltage? A pulse? Square wave?
Anybody know how to measure the signal? Thanks