stormsearch

Just note that disabling start/stop via FORscan is done by disabling the BMS system. The BMS incorporates many controls but only provides inputs into the start/stop system strategy. One parameter is the Battery SOC. If the BMS is disabled, it is no longer able to provide the battery SOC and is main reason why s/s is disabled. The BMS does control the charging strategy for fuel economy improvements, and less perceived performance gains. Note, this is really nothing new, Honda has been doing it for about 15 years now.

perfectlyfrank

Would this mean that with the plug by the brake pedal removed, BMS will be disabled? Or even when *** is turned off by pressing the button?

1sharphook

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1sharphook

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akbrian

1sharphook

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akbrian

1sharphook

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cthusker

I wanted to accomplish one thing which was stop getting the "system is off to save battery" which is exactly what's happened. It's almost like some don't want or refuse to believe this modification works. Well it's certainly working on my truck because my SOC is consistently at 90+%! If it's doing something else that's negative I haven't observed it yet. Not to say it might but BCM it going to stay disabled until it actually causes a problem. I've seen MANY posts about batteries being replaced prematurely even under warranty. If this modification works (so far it does) then it's worthwhile if you don't want the battery to potentially fail in a year or two.

I'm going to continue to monitor the SOC over the next several months. If the SOC changes or this mod causes other issues I'll report back...........

stormsearch

Technically, the BMS provides multiple values for start/stop system. An SOC value and a Quality Factor value is another one. if the Quality Factor = bad, the SOC is then considered not reliable for the S/S system. Ford would not trust the SOC to enter a stop mode if noting a bad quality factor. The SOC is still used for other BMS functions like load shedding. So while reading SOC, you should also read the quality factor under DID: $420A BattULoState_D_Qlty. The value will change from 0 - 3. Unfortunately, I'm not able to tell you what number is considered good.

Also note, smart charging is called when the PCM commands the operating voltage of the alternator (compared to when the alternator did it). However, I've seen even Ford marketing material that doesn't accurately depict on how the system operates either. What is being disabled are a range of "charge modes" most of which are for fuel economy improvements. What is left is the standard conventional charge mode that we are all familiar with before BMS was implemented. Smart charging will always be in operation, PCM controlling charging voltage.