Crankcase Ventilation Monitor

CRANKCASE VENTILATION MONITOR

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.