Originally Posted by
NancysToy
I don't know if the steering recall update started these problems, but it seems to have exposed them. One thing it did was remove the deadband around the zero steering angle, to provide assist immediately in a turn. I suspect that they also changed the programming to then require movement or a certain speed, to compensate for zero deadband and get rid of the "twitch" some of us have experienced. With instrumentation systems, if there is insufficient deadband, and some of the system sensors are off, or if the system is turned on with sensors off zero, the proportional control gets carried away and goes nuts. This could explain the problems, due to damaged, failed, or out of calibration sensors, that have been reported. A technician error could damage a sensor, especially the torque sensor, and the zeroing of the steering angle sensor is easily overlooked, which can explain subsequent failures after bad DPS units have been replaced. As was said, this is a complex system, and the steering update seems to have made it more sensitive. Just conjecture on my part, however. I firmly believe that there is no single answer to these similar difficulties.