Prev: Brake advice on a 1996 chevy Silverado 4x4
Next: $50,000 for KILLING FBI, CIA, NSA and NIS DIRECTORS
From: stryped on 1 Jun 2010 11:37 On May 29, 9:39 am, aarcuda69062 <nonel...(a)sbcglobal.net> wrote: > In article <htr673$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?
First
|
Prev
|
Pages: 1 2 3 4 5 Prev: Brake advice on a 1996 chevy Silverado 4x4 Next: $50,000 for KILLING FBI, CIA, NSA and NIS DIRECTORS |