GM MAP Sensors

[Clare Snyder]

Dave Andruczyk wrote:
> 
> > Does anyone here know which wires do what on the GM Map sensors? I'm also
> > wondering what the signal range is on the two, and three bar map sensors. Is
> > it just a voltage range, like 0-5v?
> 
> Yep,  the map sensor is typically just a variable resistor.
> o volts goies in one term, 5 volts on the other, and the middle line (
> sometimes) is the output. ( wiper of the pot)
> 
> you can tell which is which witha voltmeter..
> ends have the highest resistance between them.
> 
> Dave
Except on some they are solid state, and although they ACT like a pot,
they don't measure like one. On these animals the voltage on the second
terminal varies with pressure, but an ohm-meter will not give you an
indication. Sort of like a variable voltage regulator, varied by MAP.
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