Theory Of Operation
WARNING: This page is about a different car, the 2013 RAM 3500 HD and 2013 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
The Crankcase Pressure Sensor is used to monitor the pressure inside the crankcase. The Powertrain Control Module (PCM) supplies the Crankcase Pressure Sensor a 5-Volt reference voltage. When the crankcase pressure is low, the sensor signal voltage is low. When the crankcase pressure is high, the sensor signal voltage is near the 5-Volt reference voltage. The PCM monitors the Crankcase Pressure Sensor Signal circuit voltage to calculate the pressure of the air within the crankcase. This is a one trip fault that will set when the Crankcase Sensor signal is not operating according to a calibrated threshold. The PCM will illuminate the MIL immediately after the diagnostic runs and fails.