After doing some diagnostics on my car with the trouble code PO505, I started with checking the voltage from the PCM to the MAP sensor and that voltage was good. Then I back propped the MAP sensor and cranked up the car. Doing this, I was testing the voltage from the increase of the vacuum when the RPMs increase. I revved the engine up to 2000 RPMs and the voltage went from 1.5 down to 1.35 when it should have increase from the increase of vacuum. Also, I have checked the IAC valve and it seems to be operating like it should.
Does this indicate a bad MAP sensor? or is there any other way I can go about checking before I come to a conclusion.
My car has 164000 miles.
My car has an automatic transmission.
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