BMW 5 Series: Crankcase monitoring

On-board diagnosis

Feed-in point of the blow-by gases to the clean air line upstream from the exhaust turbocharger

1. Non-return valve
2. Connection to exhaust turbocharger
3. Captive screws
4. Crankcase bleeding connection
5. Tank ventilation connection
6. Connection to clean air line
7. Aluminum heating pipe
8. Electrical connection of heating element

Owing to the stricter legislation in the USA, the engines for the US market have an OBD concept "pressure sensor". With a differential pressure sensor in the tank ventilation system and the hot film air mass meter, leaks in the crankcase ventilation, tank ventilation, as well as the blow-by lines can be identified. Via a feed-in point at the exhaust turbocharger the blow-by gases are fed back into the clean air line of the air intake system.

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