PicoScope 7 Automotive
Available for Windows, Mac, and Linux, the next evolution of our diagnostic scope software is now available.
that is interestingand if I removed the probe with it running it would stay running.
Yes agreed, adding anything, (scope, dmm) would have the potential to affect a circuit, albeit with negligible effect.But the point of the exercise was to demonstrate that the scope, no matter how minor, can effect the circuit.
A coil may pull 5 amps but I very much doubt the problem is in the coil circuit (although I did incorrectly use that terminology in my first post, that should of read coil/transistor circuit), I'd more be looking at the transistor circuit.But here we have 4 ignition coils that can not operate because their path to Ground / Earth is paralysed by high resistance / Open circuit at a Common Ground Point "F15"
That's a given. How was that transistor/coil circuit effected by cranking voltage. Hows that transistor effected by negative coil oscillations once started?There has to be another variable here ?
I'm not doubting youI should of got a video of this happening
It is very likely that it is triggered by a 5v signal which is monitored. None of that explains what you encountered.The only thing that I can come up with is the engine control unit triggers the coil with a 5v signal and their might be some form of monitoring on the circuit