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Re: VSS output
"Shawn R. Lin" wrote:
>
> What type of signal is the VSS output from the ECM?
I assume you are talking about the 2000 & 4000 ppm outputs from
something like the 1227730? Those are driven by open collector outputs.
In other words, switches to ground. The destination circuit is
expected to have a pullup resistor.
The 4000 ppm output(s) will have the same duty cycle as the VSS sender
signal. The 2000 ppm outputs will of course be 50% (unless the VSS
input frequency isn't constant.)
--
Ludis Langens ludis (at) cruzers (dot) com
Mac, Fiero, & engine controller goodies: http://www.cruzers.com/~ludis/