I am somewhat confused right now. I bought an Innova 3140 scanner some time ago. It claims to show sensor outputs, but it does not do that. You get a fast changing digital reading which is no good at all for telling what your sensor is actually doing.
Clearly, I need something which displays a graph of the sensor output.
I suspect I simply can’t afford one, but can’t even seem to find one which will do that. My 3140 internet says it will graph, but that is obviously false, so I have no idea what that word, "graph’ means in reference to the 3140.
Others say the same thing when obviously they do not display a graph.
So, how do I find a scanner which will really display sensor outputs? Are those the $4000 machines?
And, if the solution is a separate oscilloscope, how does one hook it to the OBDii system?
Thanks for any information.