From: stryped on
On May 29, 9:39 am, aarcuda69062 <nonel...(a)sbcglobal.net> wrote:
> In article <htr673$vf...(a)speranza.aioe.org>,
>  "Steve W." <csr...(a)NOTyahoo.com> wrote:
>
> > aarcuda69062 wrote:
> > > In article <htpuj5$a2...(a)speranza.aioe.org>,
> > >  "Steve W." <csr...(a)NOTyahoo.com> wrote:
>
> > >> stryped wrote:
> > >>>> - Show quoted text -
> > >>> Can I check the wheel speed sensors with an ohmeter?
> > >> They are not that easy to test. They are basically modified hall effect
> > >> sensors
>
> > > No they're not, they are permanent magnet generators.  Very basic.
>
> > And the interruption of the magnetic field through the inductance coil
> > by the reluctor which generates the A/C waveform is called? The Hall Effect.
>
> Actually, it's called 'reluctance.'
>
> >  Either way a resistor can't be used to test them. And an ohm meter is
> > useless unless you want to see if they are open.
>
> He's got two codes indicating open circuits so an ohm meter isn't
> useless and I bet his ohm meter is also an AC volt meter which would
> give him some direction on the 'signal missing' code.
>
> > The best method is with
> > a scope and watch the waveform coming off the sensor wile in motion.
>
> He can also get direction with an AC volt meter.
> We both know that millions of these systems were fixed over 20 years ago
> with a DVOM, no scan data, long before lab scopes came into vogue.
>
> > BUT
> > I'm kind of doubting he has this available. OR knows how to use the info.
>
> Yup!
>
>
>
>
>
> > >> and generate a frequency that the ECU calculates into a speed.
>
> > > The EBCM uses both frequency and signal amplitude.
>
> > True but ABS function is controlled through the 150K signal on a KH system.
>
> > >> The easy way to test them is with a scan tool. You can drive down the
> > >> road and see what speed and frequency the ECM is getting from each sensor.- Hide quoted text -
>
> - Show quoted text -

Can you help me on how to doagnost this with what I have available?