yes, the white/yellow signal wire outputs a square wave with a peak of about 5 volts. If you have access to an oscilloscope and spin the gear by hand, a healthy sensor would output a perfect square wave pattern.


hmm now that I think about it, back when I rewired my full engine harness (1999 model) and removed the OBDII harness, I remember (2) white/yellow wires from the ECU to the harness that eventually went to the dash. When I installed my own harness, I wired the white/yellow from the speedo sensor to both of those wires from the dash. Not sure why there are two though... I checked the continuity from the engine bay end, and both wires went to the same location. I tied both together for safe measure.