Measuring signal Amplitude on ABS-sensors

[Marc Swanson]

I didn't see anyone else reply to this so I'll try to help.

> Having an annoying ABS problem, where the ABS engages every time i'm
> braking , at speeds < appx 5mph.

My 90 did this until I disabled the system.  It wasn't worth it to me to
diagnose the poblem, especially since I don't have an o-scope that I can use
in my garage.


> Reading the mails i can see that it possibly is adjustment one of the
> sensors.
>
> Now, not wanting to mess with a correct adjusted sensor i decided to roll
> out my oscilloscope, and measure the signal on both my front sensors.

cool.  I really need to get one.  I'm leaning toward a pc-interfaced
solution. What did you use?


> Easily done by jacking up the front, and _carefully_ engaging in 1st.
>
> Now, ....
> The left sensor measures 4Volt peak-to peak.
> The right measures 2 Vpp, so this is the one i'll be looking at.
>
> BUT - what is the right amplitude ?


Check this out:

http://www.sjmautotechnik.com/misc_waveform.html

The chart key says 2v/div so that must mean that ~4Vpp is what you want.


Hope that helps!

-Marc-
87 4ktq
88 90q