I just realized that there is no vacuum hooked up to the MAP sensor. I know the vacuum comes somewhere from the manifold, but have no idea as to where. I cant seem to find a loose wire anywhere near the MAP. If I am missing the wire, what size do I need? Thanks for the help in advance.
The black/white wire on the BAP/MAP sensor is the ground.
Code 22 MAP (vacuum) or BARO signal out of range. The MAP or BARO sensor is
pretty much the same sensor for both Mass Air & Speed Density cars. The main
difference is where it is connected. Mass Air cars vent it to the atmosphere, while
Speed Density cars connect it to the intake manifold vacuum. Its purpose is to help
set a baseline for the air/fuel mixture and changes in barometric pressure. The MAP
or BAP sensor puts out a 5 volt square wave that changes frequency with variations
in atmospheric pressure. The base is 154 HZ at 29.92" of mercury - dry sunny day
at sea level, about 68-72 degrees. You need an oscilloscope or frequency meter to
measure it.
Baro or MAP test using frequency meter - run the test key on engine off. The noise
from the ignition system will likely upset the frequency meter. I used a 10 x
oscilloscope probe connected from the frequency meter to the MAP/BAP to reduce
the jitter in the meter's readout.
If it is defective, your air/fuel ratio will be off and the car’s performance &
emissions will suffer.