ESC errors

[Shannen Durphey]

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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