''I've checked the voltage at the VSS connector near the wheel. The R/Y shows 4.99 volts, and the W/Y shows 4.88 volts. This is the same as on my other car.' unquote.
The W/Y is probably the signal and will really need an oscilloscope to measure when the car is moving. There would be pulses so a meter should read 2.5V when moving. A duff TSM could pull that signal permanently high so you may see 4.88V when moving.
