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Old 11-20-2013, 12:15 AM   #1
Davew
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Join Date: Oct 2012
Location: Melbourne, Australia
Posts: 598
My Ride: 2004 330ci Msport
Fuel consumption obd adjustment

Found this while searching for something else, thought it may be of interest to a few.

Adjustment of consumption indicator
The DME control unit calculates the amount of fuel currently being consumed and sends the value to the on-board computer. Here the fuel consumption is calculated in l/100 km as well as the average consumption and displayed.
Matching function
Prior to transfer to the on-board computer, the consumption signal is multiplied by a correction factor in the DME control unit. The correction factor is set at the factory to 1.0 and is adjustable within certain limits with the 'consumption control matching function' In this way, the consumption displayed by the on-board computer can be corrected up or down.
Application
Caution: Before using the matching function it is essential to make sure that there are no faults in the DME control unit or other problems in engine operation.
Matching can be used if the customer determines and complains about a deviation between the following values:
Fuel consumption calculated by the on-board computer
Fuel consumption determined on the basis of refuelling
These two values must be entered at the corresponding point during the matching procedure. The matching function then automatically calculates the correct correction factor and transfers it to the DME control unit.
The correction factor can decrease or increase by maximum 12 %. If the newly calculated correction factor is outside these limits, the user will be given the option of setting the factor to the maximum permissible limit or not at all.
Determining fuel consumption
It is necessary to determine the fuel consumption correctly in order to achieve the required effect of the matching procedure. The following procedure is recommended for this purpose:
Refuel vehicle completely full (to brim)
On-board computer: Recalculate fuel consumption
Drive vehicle over several hundred kilometres (with several refuellings if necessary)
Refuel vehicle completely full (to brim)
Calculate actual fuel consumption
Cautionriving with different driving styles can influence the matching accuracy and its effect on the energy control display.



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Old 11-20-2013, 03:07 PM   #2
E46 Coupe
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I tried to access the OBC correction adjustment on my 323 but it was locked out.
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