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Reset Adaptations on MGF 2 years 2 months ago #194294

Hi,

I tried this after adjusting stepper motor steps and my engine stopped. I was able to start it easily and I think the car is running better now. I have a 1996 MGF VVC.
I had adjusted the stepper motor previously but I didn't do the Reset Adaptations. I noticed a small improvement with gear changes being smoother.
I wanted to ask who has tried this and does anyone know what it does.I presume it sets the ECU back to factory defaults but I wonder how many parameters it affects.
After I noticed the improvements, I tried the reset of the TPS and the car seemed lumpy again. I redid the Reset Adaptations and it definitely ran better. I have had a lumpiness around 2000rpm when slowly accelerating after no throttle.

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Reset Adaptations on MGF 2 years 1 month ago #194299

These features are reverse engineered from a factory MG Rover T4 diagnostic tool.
The answer to the question "what does the feature do?" is, the same as a T4.
I can't tell you what is going on in the inner workings of the ECU because I don't know.

I can only guess, and here is my guess:-

Normally ECUs will "learn" the input signals from sensors in order to compute out unknowns such as the tolerances in the sensor signals, or other things outside of the manufacturers control such as fuel quality. Essentially if they have two out or three sensors saying the same thing and the third is 5% out, then the ECU will "learn" that the third one is 5% out and calculate everything on that basis.

There will be a limit on this adaptability. If a sensor is 50% out then that means that the sensor has gone bad or something else has failed and then the ECU will enter an error state and log a fault code.

I enterpret resetting adaptations as meaning that the ECU forgets all of the tolerances that it learned and starts again.

If the learning algorithm is perfect then it wouldn't matter but maybe it isn't. Maybe there are corner cases.

My guess is that the intended use is that if a technician changes something, like fitting a new sensor, then reset adaptations makes the ECU relearn from the new situation so that it gets there quicker.

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Reset Adaptations on MGF 2 years 1 month ago #194300

stepper motor stops is a prime example.

The ECU is trying to hit a certain idle speed. The exact position of the throttle body for a specific idle speed will depend on a number of factors such as air temperature, coolant temperature, and the mechanical tolerances of the throttle body.

The ECU will try and "learn" what normal looks like so that it can hit idle quicker without having to hunt for it every time.

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Reset Adaptations on MGF 2 years 1 month ago #194320

Thank you. There seems to be little info on it on the web.

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Reset Adaptations on MGF 2 years 1 month ago #194348

I assume that if the adaptions are not reset, the ECU will continue to re-adapt as the environment changes......
The following user(s) said Thank You: gw01

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Reset Adaptations on MGF 3 weeks 2 days ago #200418

Hi,
in pscan, for MEMS2J the possibility of reset by adaptation (STFT, LTFT?) is indicated, for MEMS3 no. Does anyone know why not?
Thanks. Karel

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