[Gmecm] BLM cell confusion

[Ryan Hess]

If that's true, then I don't know what to tell you. 
Maybe someone with a scan tool can say for certain,
but all I know is what freescan tells me.  IMHO, 0.7mS
is pretty low for a BLM cell 2 learn enable.  I think
it should be easy to hit in neutral, but at the same
time, the BPW as reported by freescan didn't move from
1, so maybe that's something I need to play with some
more.  

--- Gary Evans <gary at garyandliz.com> wrote:

> Yeah, it's been busy around here this morning :)
> 
> The ECU reports BPW in fractions of a ms, so
> freescan should be able  
> to report something more useful than "1".
> 
> There is a minimum opening time, but below these
> values:
> 
> 872D      0054     84 KAPLH    1.28 MSEC   MIN BASE
> PULSE, MSEC*  
> 65.536 HIGH HYST
> 872F      0040     64 KAPLL    0.98 MSEC   MIN BASE
> PULSE, MSEC*  
> 65.536 LOW HYST
> 
> The computer will just double the open time and
> spray half as often.
> 
> Then again, this may not be the problem at all. I
> don't have any  
> other ideas though...
> 
> -Gary
> 
> 
> On Nov 14, 2005, at 3:52 PM, Ryan Hess wrote:
> 
> > Wow! and suddenly there were 7 messages in my
> inbox!
> > I'm using freescan and an ALDL interface.  I would
> > ASSUME that the injector BPW at idle would have to
> be
> > greater than 0.7mS, since injectors all require
> some
> > minimum open time - and presumably - the PCM knows
> > this.  The map is reported to be about 0.29 to
> 0.31
> > when in cell 2, at 1500-1750rpm.  BPW is reported
> to
> > be "1"...
> >
> > Ryan
> >
> >
> > --- Gary Evans <gary at garyandliz.com> wrote:
> >
> >> What are you using to scan? Is there no way to
> see
> >> bpw on your setup?
> >> And you're sure that MAP is not below the minimum
> >> value for learn?
> >>
> >>
> >> On Nov 11, 2005, at 12:21 PM, Ryan Hess wrote:
> >>
> >>> well I just changed the BPW learn for off-idle
> >> high
> >>> and low hysteresis values to 1.0 and 0.7mS
> >>> respectively.  This time, I DID notice the cell
> 2
> >> BLM
> >>> change from the default 122 to 124 (which is a
> >> step
> >>> forward).  However, the INT is still hanging
> >> around
> >>> 137, proof that it could move more, but isn't.
> >> All of
> >>> the other conditions are being met - at least I
> >> assume
> >>> the BPW is above 0.7, perhaps I need to drop it
> >> some
> >>> more?  I did make sure to change the CCP enable
> >>> coolant temp to FF, but maybe it's still coming
> >> on? So
> >>> frustrating...
> >>>
> >>> Ryan
> >>>
> >>>
> >>> --- Gary Evans <gary at garyandliz.com> wrote:
> >>>
> >>>> Closed loop conditions met (Coolant temp up,
> >> engine
> >>>> run time met, no
> >>>> fault codes, o2 sensor ready)
> >>>> Charcoal canister not purging.
> >>>> RPM between 400 and 6375
> >>>> MAP above 22 kPa
> >>>> BPW above 1.08
> >>>>
> >>>> If you are just revving the car in neutral, it
> is
> >>>> likely that one of
> >>>> the conditions is not being met.
> >>>
> >>>
> >>> 	
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> >
> >
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