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Discussion Starter · #1 ·
I was just curious, does the Map Sensor voltage lower with less pressure and raise with more pressure? Or is it reversed? Thanks for your help
 

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Not sure about MAP, but the MAF sensor input increases in voltage from idle to 3000rpms (05 Elantra) specifically 1V to 2.3V. I'm assuming MAP is the same?
 

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MAP sensor resistance and manifold pressure are inversely proportional. I.E. as manifold pressure increases (vacuum decreases), sensor resistance decreases.

So to answer your question more directly, MAP sensor voltage signal and manifold pressure are directly proportional. I.E. as manifold pressure increases (vacuum decreases), sensor voltage signal increases.

Oh, and just fyi: some MAP sensors instead convert the ECM's 5 volt reference signal in to a frequency, and send that frequency (in Hz) back to the ECM.
 

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Discussion Starter · #4 ·
That's what I'm thinking. I just wanted to make sure my logic was right going in. I'll be able to tell you tomorrow if it's wrong. lol
 
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