Detection Unacceptable Increase of Emissions

WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 2010 BMW M6, 2010 BMW M5, 2009 BMW M6, 2009 BMW M5, and 2008 BMW M6. However, it is still accessible from the selected car via links, so may be relevant.

This section describes the detection of unacceptable increase of emissions (according to OBDII-regulations).

If the sum of cylinder(s) misfire counters within 1000 revolutions is 4 times exceeding a predetermined value during a driving cycle, or during the first 1000 revolutions, the fault code for emission relevant misfiring is temporarily stored. If the following driving cycle is also above the emission limits, the MIL will be switched on and a cylinder selective or global fault will be stored.

If more than one cylinder is misfiring, all misfiring cylinders will be specified and the fault code for multiple misfiring cylinder will be stored. If one cylinder incorporates 90% of all misfire, an error report for this cylinder will be stored only.

The error report stored for any cylinder, which did not have any misfire during the interval of 1000 crankshaft revolutions, will be cleared. The error report for multiple cylinder will be cleared, if no cylinder did have any misfire. At the end of each interval all counters are reset to its initial values.