Did some probing today and verified the MAF is working correctly. The BAP sensor problem still plagues me tho...the only sensor that is not functioning. The color code of the wiring in the engine compartment is slightly different from the schematic...it is correct at the ECM termination point however. I don't have a clue where the transition occurs.
Schematic -
http://www.veryuseful.com/mustang/te...ng_Diagram.gif
VREF color at the sensor is Brown/White (shows Orange/White on the schematic). It has the correct voltage of 5.07v key on/engine off.
Signal return is Grey/Red (shown as Black/White on the schematic). It has .04v.
BP is Green/Black which is correct all the way and has 2.58v. When I try the Hz scale on the meter it does not move from zero. There is only one scale on this meter for Hz (20K)...wrong scale for this test?
I did a continuity test on the BP wire from the sensor to the ECM connector and it appears solid...I am baffled at this point and don't know what to do next.
There was a 3 bar MAP sensor that came with the PMS and a short jumper attached to the piggyback harness. When I plug the 3 bar in the screen instantly shows it functioning...I can move the reading by applying suction to the port. I don't know if this could be used in lieu of the barometer sensor for this car/computer. Open to any suggestions as I'm totally stumped on this one.
Btw, I did bypass the PMS and went straight to the ECM as a test as well...still no Hz reading, but the engine still fires and runs.