im 99% the speed sensor outputs a voltage like the O2 sensor does, if so, what is its range? i searched, but i didnt find anything useful on here, google, or accordinglydone....so if i missed something let me know. im working on a little project and it requires me knowing the voltage range of the speed sensor (i would think most other ones would work off the same principle) and a general idea of how it works and how the voltages relate to the actual speed. any help would be appreciated, and thanks

edit: ok i believe its from 0 - 5 volts, but is this a linear change or what?



Modified by madd at 10:04 PM 8/9/2004

 

yes it is 0 to 5 volts you are corect. this is for sensors like tps, crank sensor stuff like that

 

yea, but is it linear or does it pulse? i would think it would be linear, but weirder stuff has happened.

 

its a pulse width modulation signal, so wahtever ur designing, ur gonna need to dip into some digital design too,

 

yeah, the only thing i need to know is a reference to a speed..say 10mph...and what it's voltage is. i've got the digital/analog stuff taken care of...its raing so i cant exactly go out and rig up my voltmeter...i was hoping someone that is an actual honda tech would know (no one would take my call at my local honda dealership)

 

an acutal honda tech wont know that they will jnow how to trouble shoot and repalce it. your best bet is to data log the singal on teh VSS.

 

yeah....i didnt think of that....ill go with the volt meter first on some back road to see if i can get anything thats useful and accurate.

 

if you can get a volt meter that will log it somehow that will help a lot. i know a vss will go from 0 to 5 as it rotates. you may want to pick up somehting like the innovative Lm-1, it can log 3+ inputs of voltage....

 

naaaa...good idea tho ill just take my time and spend a good many hours taking notes, etc... im still kinda shady on how it works, but i guess ill find out tomorrow if its not raining...i assume that so many volts equals so many miles per hour...like a 1/10th of a volt is 10mph, or whatever. then again, i guess it could work on another principle.....anyways ill let everyone know how it works out if i can try it out tomorrow. thanks v4lu3s for your helpful advice

 

i think you miss understood my first post, this signal that the VSS sends is a pulse. its a square wave, with a high of 5v and low of 0v.

so your not gonna see an output of say like 0.3 volts for 10mph. What you will see, a frequency of say 2 pusles per second for 10mph, and so on.

The signal is basically a frequency modulation signal, not an analog voltage signal. Sorry about the confusion in the first post, I didn't mean pusle width modulation, I meant frequency modulation.