ESC errors

[Ward Spoonemore]

Ok you found it, that's it.

Ward

On Thu, 11 Mar 1999 07:52:29 -0500, Shannen Durphey wrote:

> Ok, now I understand.  Also known in factory service manuals as the
> ESC module.  Has 4 wires, 3 letter code on a sticker, about 3" X
> 3.5".  Man, I really thought I'd missed something.
> Shannen
> 
> Ward Spoonemore wrote:
> > 
> > On Wed, 10 Mar 1999 22:19:34 -0500, Jason Weir wrote:
> > Well i guess you don't have the 1/2 card ? I assume you will find the
> > approprate shop manual and install same or shut off the knock system.
The
> > error is probaly because you don't have this item. Most error codes
indicate
> > somthing fell off, If as assumed nothing to do with knock.
> > 
> > The knock sensor should not be conneced to the ECM directly.
> > 
> > Ward
> > 
> > >
> > >
> > > Ward Spoonemore wrote:
> > > >
> > > > 1. Is there a GM 1/2 card installed ?
> > >
> > > What??? If I have to ask what a 1/2 card is does that mean I don't
have
> > > one?  I dont believe I have one, the system is based off of a 88-91
GM
> > > full-size pickup with the 4.3 V6.  Should I have one??
> > >
> > >
> > > > 2. what calibration are you running. several of the do not have ESC
> > > > enabled.
> > >
> > > Calibration is one of my own not sure which GM cal it is based on but
> > > ESC is enabled and it works great for a while, then all of the sudden
I
> > > get an ESC circuit failure, then the knock counts cycle through 255
over
> > > and over.  This is the same code set when you unhook the timing
> > > connector to set the static timing.
> > >
> > >
> > > > 3. generaly there is a problem with older knock system sensing
false
> > knock,
> > > > partucularly is the sensor is near a header.
> > >
> > >
> > > Could be but the knock sensor is in the stock location, and the
vehicle
> > > has stock manifolds. And from experience when I really crank up the
> > > timing so I can hear the knock the sensor detects it. but under
normal
> > > conditions it detects knock and retards timing way before you ever
hear
> > > it.
> > >
> > >
> > > > 4. way to find if it actaul knock is to take out 8 - 10 deg timing
and
> > see
> > > > if it continues.
> > > > 5. Real knock once started is hard to stop.
> > >
> > >
> > > I still get the error even when I take out enough timing to ensure
that
> > > I am getting no knock, although the wire from the knock sensor does
> > > snake real close to a couple of plug wires so it might be a noise
> > > problem.
> > >
> > > > On Tue, 09 Mar 1999 21:47:40 -0500, Jason Weir wrote:
> > > >
> > > > > Ok we all know that one of GM's 7747 calibration's ESC counts
would do
> > a
> > > > > 0-255-0-255-0-255 and so on.. Well I have a problem with my 7747
> > setup,
> > > > > most of the time its ok but sometimes I get an ESC code and as
soon
> > as
> > > > > the ESC code sets the counts start to recycle until I shut off
and
> > > > > restart the engine.  I have not been able to determine whether or
not
> > > > > this occurs at the same time the ESC system is taking care of
knock
> > or
> > > > > not.  Any ideas what might be the problem... thanks
> > >
> > >
> > > Jason Weir
> > > --
> > > 88 Wrangler - 155K miles and counting
> > > 258, 4.0 head, Cherokee header, 2 1/2 exhaust with high flow cat &
> > > Flowmaster
> > > GM TBI, Crane 260H Cam
> > > TJ Fender Flares
> > > http://home.att.net/~jweir
> > > CNC 4X4 Member - http://cnc.4x4.org/
> > 
> > _______________________________________________________
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> 





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