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How To Test Map Sensor?

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According to the Hynes manual, the MAP sensor for a 92 Camry 4 cyl is tested as follows:

1) First check for 5v reference from connector. Passed.

2) Apply vacuum and the black/white wire should show a steady drop as the vacuum goes up. Failed

So I ordered a used one from a wrecking yard and it also fails step 2. Is it possible that thew new (used) one I got is also bad or is the test not accurate? Any help would be appreciated. Thanks!

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