I parked pointed uphill with the front wheels looking at a big speed bump. When I went to leave it was raining heavily and the bump became a chock against the front wheels. Traction control is still new to me so I decided to see what it'd do if I tried to get over the bump. As I applied more throttle the rears increased spin until I hit 1500 RPM regardless of more throttle. However, a second or two after hitting the floor, I got DTC's set, traction control turned off, "service traction control ESC" appeared, and the rears quickly spun up to over 3000 RPM before I got off the gas. That was a surprise because being stuck and someone flooring it should be the condition where traction control is really needed. My girlfriend is someone who will do this, for example.
The codes turned out to be left front and right front wheel speed sensor failure. Makes sense that traction control can't operate without those as inputs but zero speed, low traction, and full throttle seems to be the obvious case where wheelspin needs limiting. I cleared the codes, restarted, and everything was back to normal. So, I repeated this test twice with the same results.
I tried this with my girlfriends BMW 335i and got expected results. RPM is limited to about 1500 and you can floor it indefinitely without that changing. Sounds like an overlooked use case on the Sky. Admittedly it's an odd test case, but not if you're stuck in the mud, so it should have been worked out.
Anyone have any idea why our cars, or at least my car, would behave this way? Unlikely, but possible that both my front sensors are bad? Or, maybe this has been addressed in an update and I need to perform service programming on the module.
2008 Redline powered by a zero point module
Last edited by ZPM; 02-04-2019 at 04:38 PM.