Automatic transmission, limitation in reverse gear
WARNING: This page is about a different car, the 2003 Saab 9-3 and 2002 Saab 9-3. However, it is still accessible from the selected car via links, so may be relevant.
An engine-dependent torque limitation takes place when selector lever position R is selected to reduce the load on the powertrain mountings.
Engine torque is converted to mg air/combustion and constitutes the maximum air mass/combustion permitted by the automatic transmission.