to: spfautsch
according to
Interpreting OBDII Data
or
http://obdcon.sourceforge.net/2010/0...ed-load-value/
PID04 is MAF/maxMAF
for diesel engines it is something else, but essense should be same.
and probably you will be back to 14.7 at some point.
DFCO detection is done using PID 0x11 (THROTTLE_POS) and PID 0x03 (FUEL_STATUS). For now it looks like PID 0x04 could be used too.