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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