I have a 2000 Acura Integra GSR (B18C1) and upon recently investing in a scanner, I have found that the computer reads the MAP sensor readings backwards. I have a mechanical vacuum gauge hooked up in the cabin that shows proper vacuum at all the right times (approx 20 during idle, down to 0 during heavy acceleration 20+ during engine braking), I have purchased another sensor that reads the same on the computer, I have tested the sensor with a vacuum pump, and I even tried reversing the 5v / signal connections thinking maybe a previous owner did a bad wiring job. That made it read even more off.



There has been no alteration to the extent of my knowledge to any of the wiring including any sensor circuit (except for the IACV - the Edelbrock Performer X Intake Manifold pulled it so far away the wires needed some extension.)

I'm out of ideas and there's nothing online regarding this! Please help me.

Thank you thank you!

PS - I have been planning on getting my car tuned and therefore downgraded to OBD1. If I do this then does that void the necessity to figure this out?


Thanks everybody!

 

Check the voltages. Also, make sure (since you said you swapped around some wiring) that it's wired correctly.
Voltage: 2.4 - 2.5 V at 5 in hg | 1.4 - 1.5 V at 15 in hg | 0.5 - 0.6 V at 25 in hg

-Amp