Crankcase Ventilation Monitor
WARNING: This page is about a different car, the 2012 Ford Pickup, 2012 Ford F550 Super Duty, 2012 Ford F450 Super Duty, and 2012 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
The crankcase ventilation monitor is an on-board strategy designed to detect leaks in the crankcase ventilation system. The crankcase ventilation system is installed on the left rear rocker cover and connects to the lower intake manifold by a line. The monitor can detect concerns with the crankcase ventilation system such as:
- disconnected crankcase ventilation hose
- large air leak in the intake air system
- cracked or disconnected crankcase ventilation separator unit
The crankcase ventilation monitor runs once per drive cycle while the mass air flow adaptive learn is active. The monitor diagnostic compares a desired mass air flow to the actual mass air flow. If the difference between the desired mass air flow and the actual mass air flow is greater than a calibrated threshold a DTC may set.