After starting and driving away on a cold engine, the O2 sensors start switching in about 15 secs but the loop status does not change for over 3 minutes.
The photos show the display on my Tech2. The frames are at about 5 frames a second. The first photo shows the sensors start switching. The solid thick line in the second photo shows the loop status change.
The O2 sensors will only switch when the ECM adjusts fuel delivery based on feedback from the O2 sensors, pretty much the definition of closed loop. So it is surprising the ECM does not declare closed loop for over 3 minutes.
The photos show the display on my Tech2. The frames are at about 5 frames a second. The first photo shows the sensors start switching. The solid thick line in the second photo shows the loop status change.
The O2 sensors will only switch when the ECM adjusts fuel delivery based on feedback from the O2 sensors, pretty much the definition of closed loop. So it is surprising the ECM does not declare closed loop for over 3 minutes.