BMW X5 Owners & Service Manuals

BMW X5: US National Version

Fuel tank leakage diagnosis module

The fuel system leak test is regularly conducted when the engine is switched off. Here, the following processes are executed during the DME run-down period:

If the result is positive, tank leakage diagnosis is started with a comparison measurement.

The fuel evaporation control valve remains closed. The switchover valve in the diagnosis module is switched to the "Diagnosis" position. The leakage diagnosis pump impels fresh air from the surrounding area into the tank, causing the interior pressure to slowly increase. At the start of tank leakage diagnosis, the interior pressure is equal to the ambient pressure. The current draw is therefore low. As the pressure inside the tank increases, the current draw also increases. The DME evaluates the current draw of the leakage diagnosis pump.

The relevant fault is entered in the DME fault memory. Tank leakage diagnosis is then ended.

Tank leakage diagnosis can also be started with the BMW diagnosis system. In this case, the processes run as described above.

Subject to change.

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