[Gmecm] BLM cell confusion

[Gary Evans]

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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