BMW Sport

Adaptation Air-mass Flow Meter DDE5.0

In normal operation, the air mass flow meter is subject to effects such as soiling and ageing. Those effects cause divergence between the stored characteristic and the specified status resulting in symptoms such as lack of power or black smoke. In order to prevent the effects of this problem, the 'Air mass flow meter adaptation' function has been introduced on the DDE5.
Function

Air mass flow meter adaptation is performed by the DDE control unit at two operating points: When idling and under load in an operating range defined as follows:
Engine speed = 1700 ... 3000 rpm
Charge-air pressure = 1100 ... 2800 mbar
Speed = 90 ... 160 km/h
Change in intake-air temperature < 2 °C/s
Change in injection rate < 2 mg/stroke/s
Delay period = 3 s
Adaptation sequence at each of those points:
The air mass flow meter adaptation uses certain operational data to calculate the theoretical air mass flow passing through the engine. The DDE control unit compares the figure obtained with the level measured by the air mass flow meter.
If the DDE control unit finds that the measured level differs by more than ± 8% from the theoretical figure, that difference is stored on the control unit as a compensation factor.
That compensation factor enables the control unit to adjust the measured levels before they are processed by the various functions.
Application

The service function Air mass flow meter adaptation must be run if the air mass flow meter is replaced. The stored compensation factors are reset to 0 in the process.
Use

The air mass flow meter adaptation is used as follows:
E46 M47TU: as of volume production launch
E46 M57TU: as of volume production launch
E65 M57TU: as of 03/2003 with integration stage 6.108 and DDE software VQ5.7
E60 M57TU: as of volume production launch

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