Crankcase Ventilation Monitor

The crankcase ventilation monitor is an on board strategy designed to detect leaks in the crankcase ventilation system. The monitor can detect concerns with the crankcase ventilation system such as:

• disconnected crankcase ventilation hose
• disconnected crankcase ventilation sensor
• large air leak in the intake air system
• cracked or disconnected crankcase ventilation oil separator unit

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.