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Old 08-09-2014, 01:06 PM   #1
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MPT and fuse 47

I hate to beat a dead horse but I'm confused. I have a 2014 V6 manual and lots of posters have said to pull fuse 47 periodically to reset the adaptive learning on both manuals and autos. MPT says to give a tune 50-75 miles before WOT to let the ecu relearn. I have the parts to build the pigtail with the relay to reset fuse 47 at each shutdown. should I or should I not install it?
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Old 08-11-2014, 10:01 AM   #2
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This is an interesting question and am waiting to hear a response, too. Bumping it for you.

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Old 08-11-2014, 12:41 PM   #3
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I have NOT been pulling it since MPT said to do the 50-75 mile relearn every time you change to their tune.... It is my understanding that with the fuse 47 pull you would have to repeat this relearning process every time it resets....
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Old 08-11-2014, 01:00 PM   #4
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I have two MPT tunes. When I asked about it some time ago I never got a reply. Who replied to you? Ken?


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Old 08-11-2014, 01:16 PM   #5
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this is a excerpt from the email I got from MPT.


Thanks for choosing MPT, I’ve attached your 91 Performance tune. Good bit of info below that you really need to read. Besides that make sure you let me know how you like the tune. Also, don’t forget to let the vehicle complete a relearn. Best method is to load the tune and drive easy, and avoid WOT for the first 50-75 miles.
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Old 08-11-2014, 01:58 PM   #6
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Still doesn't mention anything directly of the fuse in question.


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Old 08-11-2014, 02:24 PM   #7
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Has any tuning company ever directly mentioned the fuse 47 issue? I honestly don't think I've ever seen them acknowledge its existence.

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Old 08-11-2014, 03:08 PM   #8
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I have no problems going wot on my MPT tune right after I upload it.. so personally I don't think it would be a problem to install the relay.

Some peoples cars might take a while to adjust but mine seems to be fine immediately.
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Old 08-11-2014, 03:21 PM   #9
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Fuse 47 resets the "adaptive learning for automatic transmission equipped Mustangs. It does nothing for manual transmissions, as they shift whenever the driver shifts them.

Adaptive learning has to do with the type of driving you do on automatic transmissions (a.k.a. "shift memory"). Over time, the PCM (or ECU) "learns" your driving habits, such as you driving more city stop and go verses highway driving. It sets the shift points to obtain better fuel mileage. The problem can be when you do lots of city stop/go driving, the automatic transmission shifts at a lower speed, so the PCM/ECU remembers this. Then you go and do some 'sprited" driving, and the automatic transmission shifts too soon for your liking.

This fuse/circuit breaker does not affect any tune you have installed; you will not need to re-install your tune (if installed) if this fuse/circuit breaker is removed and installed.

So what some automatic transmission owners do to wake up the automatic transmission shift points is to remove this fuse (actually a 30 amp circuit breaker) for a few minutes, forcing the PCM/ECU to have to re-learn the shift points.

I do not believe there is a tune made that over-rides the fuse 47 symptoms. Even with firmer shifts that a tune may provide for automatic transmissions, the PCM/ECU will still learn the RPM range of your daily driving habits and set them for automatic transmissions.
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