I have recently discovered a problem when a secondary trigger signal is connected to the ecu but is not being used. The results is that the trigger signal somehow makes its way to the primary trigger causing a LESS PTRIG error.
I set this up on the bench and recorded a trigger log turning the secondary input on and off. It´s very clear that the signal is occuring once per cycle. Also uploaded is when the secondary trigger is enabled so it´s clear that it´s the secondary signal.
Link : http://www.vems.hu/files/BMW/v3.3_u001609-2013-04-28-13.27.15.triggerlog
Link : http://www.vems.hu/files/BMW/v3.3_u001609-2013-04-28-13.33.04.triggerlog