Hello this is for a 2001 Civic. This is kind of a technical question, but I need to know what the pulse train at the tachometer test connector looks like. In other words, what is the pulse voltage, pulse rate and pulse width, that kind of thing. My car currently doesn't have an engine, or I would just look at the signal with an oscilloscope. Probably not too many people know this but I thought I would give it a try - can anybody help?
The tach is driven by the pcm through serial communication. There is no tach pulse to measure. You can tap into the communication line with your dso and get a serial pattern but you wont know what it is saying.
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