VSS Pulses per mile?

Post by **stuartlowery** » Tue Dec 23, 2003 8:00 am

On a 96 Model 240sx how many pulses per mile does the Vehicle Speed Sensor send out? This is criticle information for my dash swap.

Thank you

Post by **stuartlowery** » Tue Dec 23, 2003 8:00 am

Wow no one knows?

Any one with a service manual should have this information.Here's a tip on most GM cars it's 4,000 pulses per mile. What does Nissan use?

Post by **IvoryJ30t** » Tue Dec 23, 2003 8:00 am

i think its 2000, but let me double check

Post by **IvoryJ30t** » Tue Dec 23, 2003 8:00 am

2000 pulse per mile 12v square wave.

Post by **IvoryJ30t** » Tue Dec 23, 2003 8:00 am

also, gm cars use an ac sine wave at 4000 ppm, but nissans use a 2000 ppm dc square wave.

Post by **stuartlowery** » Tue Dec 23, 2003 8:00 am

Gm uses a square wave thus Pulses per mile

A pulse is just a high low state.

Thanks for the info. I may be able to trick this into working correctly.

Post by **IvoryJ30t** » Tue Dec 23, 2003 8:00 am

it has to do with the pick ups. the gm cars with 4k ppm sensors use a hall effect sensor and a reluctor ring, whereas nissan cars use a geared sensor with im assuming an optical interruptor to create a square wave.

Post by **IvoryJ30t** » Tue Dec 23, 2003 8:00 am

i make my own pc boards and the like, i know about electronic components.

Post by **IvoryJ30t** » Tue Dec 23, 2003 8:00 am

gm cars that use the 4k ppm sender usually use a hall effect sensor. the square wave senders are usually 2k ppm. and then theres the 40 and 17 pulse per driveshaft revolution units...

Post by **stuartlowery** » Tue Dec 23, 2003 8:00 am

Please correct me If I'm wrong but I'm feeding a signal of 60HZ into the nissan speedo I should recieved 108MPH if the speedo runs directly from a 2,000 Pulse/ Mile Signal. I'm not getting that instead I'm getting 27MPH which would meant the speedo is tracking off of a 8,000 Pulse/ Mile signal.

Here's the math

((Hz*60)*60)/MPH=Pulse per minute.

60hz = cycles per second

So if I take 60hz and convert that to minutes that would be

60*60=3600 And convert that to hours would be

3600*60=216000 Now let's take the displayed MPH and devide that by our cycles per hour to get cycles (pulses) per Mile. So that will be...

216000/27MPH = 8000 P/M

Any math majors able to confirm that?

Post by **Sanjuro** » Tue Apr 03, 2012 10:10 pm

euh, I had the wrong info here for the longest time. see my writeup here

http://wp.me/pBmJh-2x

VSS Pulses per mile?

VSS Pulses per mile?

Re: VSS Pulses per mile?

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