I just don't know if it's adjustable (VAG-COM?).
Being an engineer myself, I think this is probably in the programming of the ECU. s et ting their maximum cruise control speed slightly. cruise speed maximum of 63 MPH versus an accelerator pedal. I totally agree with the Al Kane's previous post. How often do your customers change some aspect of how the programmable. Know what his response was? "All cruise controls will do that." Um, OK. Finally, I went on a test drive with a service tech, and proved to him that there was a surging in the cruise control. I took my car to the stealership several times while the car was still under warranty, and each time, a different service guy would tell me that they couldn't find a problem. In couldn't find my original post, but I found another that seems related: I think I posted in the "general discussion - A4" forum. I have a 2000 A4 automatic, and the surging from the cruise has been evident from day 1, and it is still ANNOYING! I have a friend who normally drives like this, though (on & off the gas for no apparent reason), and I told him once that he needed to be critically damped. I posted about this topic over a year ago (I think) in one of the other forums, but I couldn't solve the problem then, either. I've seen many posts about how stable the cruise control is on our TDIs. If not, demand that the VW dealer make it right because by the way you describe it, something is wrong in the ECU. Suggest you contact your Upsolute dealer to see if there is any possibile connection with their mod. I don't know if there is an adjustable damping parameter, but that's probably what's wrong. You can't physically adjust it, it has to be programmed. My TDI Jetta's cruise control is wonderfully "critically damped".Īll this is useless in a practical sense, though, because the TDI cruise control is one of the functions of the ECU, and it is achieved in software.
HOW DO I CHANGE THE CRUISE CONTROL SPEED ON CUMMINS INSITE SOFTWARE CODE
Change Injector Calibration QR Code when replacing. Set PTO idle speeds fixed and variable 4. In other words, it works the way it's supposed to. Set Maximum Vehicle Speed Set Maximum Cruise Control Speed 3. If your cruise control is "critically damped" it approaches the setpoint briskly but does not overshoot, and it maintains the speed at the setpoint without surging and backing off. When I played with the damping adjustment on that old aftermarket cruise control it did exactly what you describe, and leaving it overdamped like that made me car sick. This is exactly what is happening to you. If your cruise control is underdamped, it constantly tries to adjust speed a bit too dramatically, and constantly overshoots and undershoots the setpoint. If your cruise control is overdamped, your speed drops off when you go uphill and rises when you go downhill i.e., it doesn't follow the setpoint well. Damping is to cruise control what shocks are to your suspension: it keeps your speed from bouncing around. I once had an aftermarket cruise control on another vehicle that let you adjust three feedback parameters: gain, setpoint and damping. My 2000 Jetta 5 spd doesn't do this at all it's rock steady.Ĭruise control works in a feedback loop.