It did not matter whether passive or active sensor in thiscase. I even did not bother looking for a type of fault at that time as itturned out one lazy mechanic, who was trusted to unplug each connector toeliminate possible interference , did left knock sensor connected as plug washard to reach(it really is hard to reach tough). I guess SH engine came withshorted sensor where 12volt current possibly was feed directly to signal wire.ECU was getting warm pretty quickly. We fired ECU on a bench successfully thenwe turned back to the vehicle and in matter of minutes fault was eliminated.
P.S. sorry for bringing this old tread up...I was kindly asked to do so. My pleasure...