HowTo: Perform an ECU Reset (learned behavior) – M37/M56/Q70 

Re: HowTo: Perform an ECU Reset (learned behavior) – M37/M56/Q70

Post by adeedpb » Sun Sep 20, 2015 2:36 pm

ECU Accelerator Pedal Reset Procedure
Note: Timing is critical for this to work1. Turn the ignition switch to on. Dash gauges lit. Don’t start the engine! (Click start button twice without your foot on the brake)
2. Wait 3 seconds.
3. Fully depress and release the accelerator pedal 5 times within 5 seconds.
4. Wait 7 to 10 seconds.
5. Fully depress the accelerator pedal for approximately 10 seconds. At this point the check engine light starts to blink quickly indicating Diagnostic Test Mode II (Self-diagnostic results) has started.
6. Release accelerator pedal and wait 5 to 10 seconds.
7. Fully depress the accelerator pedal for 10 seconds. At this point the check engine light should change to blinking slowly indicating “Erasing ECU Memory”.
8. Release the accelerator pedal and turn the ignition switch to off.
9. Restart the engine. The check engine light should be out.

Here is a video of it being done on a G37:

1 comment to HowTo: Perform an ECU Reset (learned behavior) – M37/M56/Q70 

  • admin

    I did a ECU Reset last week with dramatic results. The car was immediately ‘more aggressive’ in both sport and standard modes. Now, five or six driving days later, it has settled down a bit, shifts smoothly and rarely shifts unexpectedly. As designed, she seems to have learned my driving style (lead-foot) and has adapted nicely.

    I highly recommend doing a reset after acquiring a car, I did not do this step with the BMW X3 (E83) and as a result the first few months of ownership had me thinking about $7000 transmissions and questioning my purchase decision all too often. The BMW settled down eventually, once it learned my driving style and I learned it’s desired shift points (<2500rpm or >4000rpm).

    The way I understand it, modern transmissions come with a dozen or so maps – templates with shift points pre-programmed. Based on recent driving sorties the transmission chooses a map to use. If you often drive in stop and go traffic, the transmission will adapt and offer smoother shifting in those conditions. But when the road opens up, or the car is sold to someone who does not live in an urban area, it may shift a little rough, or come on the power a but suddenly.

    Eventually the car’s computers will forget all about the city and it’s traffic, but a ECU Reset can speed up the process greatly.

    Honestly, this is something that every used car should have done before it is put on the lot for sale. The factory default is the most compromising and most likely the best mapping to perform test drives in.


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