Re: a604 Limp, Rebuilt, Sensors replaced, solenoid replaced still Limps!
- From: "treeline12345@xxxxxxxxx" <treeline12345@xxxxxxxxx>
- Date: 25 May 2006 16:03:44 -0700
Ken Weitzel wrote:
Ted Mittelstaedt wrote:
Richard, don't celebrate too quick, your tempting the daemons, you know.
You don't need a zener diode, any old diode will do, all it is for is
shorting
out the back EMF that is generated when the clutch releases and the
field in the clutch coil collapses. Any electrical supply house will have
it.
Just get the biggest wattage one you can fit in there.
But be aware that if it's a failing sensor that the way they usually fail if
they don't just go dead is to be very intermittent. You might have a limp
incident every 3-6 months, then over time the interval between incidents
becomes closer and closer.
Ted
Hi Ted...
I'd respectfully suggest that you re-consider your suggestion to
replace the existing zener with "any old diode"
A zener <> any old diode.
Take care.
Ken
Good job of figuring this out. Really tricky. Good discussion. I would
like to ramble a little since we are now discussing analog and a touch
of digital engineering in the automotive newsgroup.
"Two (equivalent) Zeners in series and in reverse order, in the same
package, constitute a transient absorber (or Transorb, a registered
trademark). They are named for Dr. Clarence Melvin Zener of Southern
Illinois University, inventor of the device." = Wikipedia.
I vaguely remember this when I was building stuff and worried about
spikes and surges. I gather the question here is allowing the signal
through but not the spike or surge. How big is that signal? +5 volts? A
Light Emitting Diode or LED would light up but that's a bit fancy.
About the oscilloscopes, an analog might be fine here. I have seen even
100/200 MHz old Tektronix 'scopes going for very cheap and they will
get the spike, yes? Now a good digital scope might what, record over a
period so one could go eat supper and then come back. I'm wondering,
maybe a dirt cheap signal probe might get it? Guess it's back to a
good, fast digital 'scope because you might want to record and inspect
the bugger at leisure.
I guess if this signal or surge is that bad, then a small isolation
transformer inserted here? That would be overkill but they really do
the job. Nothing gets by a good isolation transformer, well, maybe a
big lightning strike. Can you put one on a signal line though?
Breadboard this to see if it works?
Where's a good analog design engineer when you need one for a car? Most
engineers are digital so look for the mature guys for the analog which
is far more complicated than digital on a byte for spike basis :)
.
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