RE: Check Traction Control?
Hi, Trixie!
First of all, a quick explanation:
Your traction control uses two methods to get your car back under control when (it thinks) it detects wheelspin:
1. It pulses the brakes on the rear wheel that (it thinks) is spinning faster than the other,
and,
2. If it cannot regain control that way, it will reduce engine torque by sending commands to the PCM through the OBDII network, ordering it to retard timing and reduce injector flow.
ABS/TC will use both methods at lower speeds, but at speeds above 40mph (I'm not 100% sure of that number, someone correct me if I'm wrong) it will avoid brake pulsing for safety reasons and use engine torque reduction only.
You're feeling that.
Why? Don't know yet, but here's a few options:
If the ABS/TC module decided a problem was severe enough to trigger the warning message, it SHOULD set a trouble code. You can retrieve it via the OBDII network at the DCL connector with a scan tool.
The problem is MOST LIKELY a mismatch between rear wheel speed signals. If the scan tool you use is capable of datalogging, you can go for a drive while reading all four wheel speed signals and see if one is (even slightly) different than the others.
If you don't have access to such a device, here's the by-guess-n-by-gosh method:
Re'n're your rear rotors and look very carefully for anything that may affect the rear sensors' ability to magnetically count the exciter rings' teeth correctly, ie., rust or metal flakes on the ring teeth or sensor magnets, cracked, chipped or missing teeth on the rings, and nicked and thus corroded wiring from the sensors. I've seen sensor wires come loose from their clips and brush ever so gently against the back lips of the rims, generating erroneous wheel speed signals.
Clean and correct anything you find, sacrifice a red chicken to the OBDII gods, hope for the best, and go for a drive!