ESC errors

[Ward Spoonemore]

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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