Minimum engine torque, 4x: General: Dashpot
WARNING: This page is about a different car, the 2005 Saab 9-3. However, it is still accessible from the selected car via links, so may be relevant.
To avoid jarring when suddenly decelerating, the dashpot function will request engine torque for a brief period so that it can then be reduced gradually. This also reduces emissions.
You can compare this function with the throttle damper on older injection or carburetor cars where the throttle movement towards idling was slowed down.