Quote:
Originally Posted by larryr123
Also tried a wheel by wheel test rotating the wheels and recording the variation in voltage - no abnormalities found, they all showed voltages that rose and fell pretty much the same.
|
Reading that, suggests you are misunderstanding how to carry out the test...
It is NOT just a matter of checking the voltages, but of marking the tyre where the voltage changes. A light coloured crayon, with a brick or similar as a fixed marker works well. That ensures that a full continuous set of changes of voltages/ pulses appear around the circumference of the wheel/tyre. You may need to repeat it several times to be sure the pulses appear without fail.
The judder happens when pulses signals fail to appear, when they are expected. Most likely they will be missed at lower speeds, hence the low speed judder you are experiencing.
T4 and other diagnostics will not see it as a fault, because it is doing more or less what it is supposed to be doing - generating mostly regular pulses.