It'll also kick in while traveling at steady cruising speeds but its primary design is to alleviate the workload for the gasoline engine. (digitaltrends.com)
Both engines feature the efficiency benefits of direct gasoline injection and Active Cylinder Management, which seamlessly shuts off half the cylinders during steady cruising to save fuel. (kbb.com)
For this symptom set I graph the following PIDs: O2b1s1, Inj time, SFFT, LTFT, RPM, Then make a graph from idle, a few seconds of steady cruise then wide open throttle through the 1 - 2 shift. (mechanics.stackexchange.com)