I was having a problem with my idle showing up in a higher airflow area then it should have on my PFC.



Anyways i tested the map sensor which checks out fine at the map sensor, but the voltage at my PFC is wrong. So i think my wiring somewhere is messed up but its really confusing. The problem is my PFC shows 2.48 volts, which is correct with the engine off(atmospheric) . But when i hook a mityvac up or let the car idle (vacuum range) at the MAP sensor the voltage is something like 1.5v or less which is correct, BUT my power FC still shows the voltage at 2.48.



I could understand if the wire became disconnected then the power fc would either always show 5 v or 0 v depending how it works, it would also highlight it in the sensor check. So somehow this wire is getting voltage... but it is not changing the voltage according to what the map sensor says it is.



I will add this, if i test the A/B terminals (black and green wires) on the MAP sensor harness, with the map sensor completely removed i will get the same 2.48 volts.



Does anyone know which wires do what at the map sensor there are 3 wires green, black, and brown. And where do each of these wires go?

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got it figured out and fixed