VSS signal output information

[mcgavinz26]

I am looking for information on the vehicle speed sensor output signal that a 1994 3100SFI ECU uses. I'm guessing it's 0 to 5v pulses with frequency determining speed. If so, can anyone provide me a sort of y=mx+b equation for the relation of frequency to speed in mph?

(I tried searching through the old topics for the answer for maybe 30 minutes, sorry if this is old news or posted somewhere else.)

[bszopi]

The Vehicle Speed Sensor is a gear-driven Permanent Magnet Generator housed in the vehicle's transaxle. This sensor generates a sine wave output with a frequency proportional to vehicle speed. The ECM converts this signal to an output that is switched to ground at a frequency of 4000 pulses per mile at the DK GRN/WHT (817 CKT) wire output. This output is pulled up to 5 volts or greater by the components that use this speed signal as an input.

Thats for a 94 Beretta...

[mcgavinz26]

So, that is 44.444Hz when I'm running at 40mph and 66.666Hz at 60mph? y=22.2222x? x = mph; y = freq(never hurts to have someone double check my math)

Thanks for the information.