‘95 Freightliner Truck with a CAT 3406E
The Modis told me that the Barometric pressure sensor was reading 14.5psi. I found the sensor on the engine and found that is was disconnected, so I plugged the sensor back in. The read I got then was 15psi
Then I hooked up the CMP sensor to the Modis to see the signal the sensor was making.