Fuso VSS spec?

[pugslyyy]

Can anyone confirm for me that the FG140 Vehicle Speed Sensor generates 25 pulses per output shaft revolution? I think that's what I'm reading in the specs, but it doesn't seem to call it out with any clarity.


My M608Z tires are 586 rpm
final drive ratio is 4.875
VSS pulse rate is 25 ppr

VSS pulses per mile = 25 * 586 / 4.875 = 3005 ppm

Or am I doing it wrong?

Thanks!

 

[boostin]

Where did you find that spec? I have a factory manual I could look in unless that's where you got it from

 

[pugslyyy]

So I drove down the road today with an oscilloscope on the VSS input to the ECU. I'm pretty sure that the signal going into the ECU is 8 pulses per revolution. Pretty low frequency - only about 400 Hz at 60 mph.


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