alextaylor29

This definitely works guys, I do it once a week. There is no downside/danger to doing this. In fact before my run in my video below (See sig), I did this just to get every bit of performance I could.

See the vid if you don't believe me but this works!

Alex

93RX7LSX

From what I've heard, it has nothing to do with the ecu or tune. It affects the throttle position relearning the TPS sensor. The throttle response is increased but not necessarily horsepower.

Mackhack

Nope. It resets the TCU(Transmission Control Unit) adaptation values. Not more not less (if it does as I mentioned it before a few pages earlier after a deep conversation with some engineers from MB). I'm still skeptical ever since (used to believe it 100%).

TPS = Tire Pressure Sensor What's that got to do with it?

Jimshorts

Just so I do this correct, I need to turn the key all the way over just dont start my car?

93RX7LSX

Throttle position sensor, tire pressure is TPMS.

Mackhack

I thought you misspelled it. But I doubt it resets the throttle valve (sensor) though. I stick to it there is zero proof that this does anything. And again even engineers at MB who should certainly know were laughing about this "trick". It might just be the ultimate placebo effect.

zneB-sedecreM

This method definitely works on my 2006 W215 CL 55. I do it about every 3 weeks to month. I definitely notice after the three or so weeks that the car isn't AS responsive as opposed to when I do the reset.
The question I have is that I have my TCU tuned by Eurocharged. I know it's been covered that this reset doesn't in any way alter a tuned ECU setup, but this is mess with a tuned TCU setup?

Mackhack

It doesn't. All it does is it resets the shift points. But you can also simply push the pedal a few times really hard and let the rpm go up to the beginning of the red area where the tcu shifts anyways and you get the exact same result as with the gas pedal trick. After about 40 shifts the tcu keeps these shift points as the current driving style.

That being said, if you drive with low or moderate rpm and the transmission shifts early then you get the sluggish driving style set, if you drive in binary mode (full throttle, slam the brakes, full throttle, brake, full throttle,...) you get more aggressive shifting points set.

Hope that clarifies it a bit more.

danlnyc

no....it does. I did this last week for the first time and the difference was absolutely clear and immediate. The response, the shifting, everything, was on POINT. I was blown away...

trust me, if I felt nothing (especially from a car I drive everyday and I know how it drives) I would've been extremely skeptical too.

ThePuppetMaster

My wife came home today with check engine light on in her clk350. Reset ECU, which cleared code and car feels much quicker now. Thanks guys

Sincity

I hope this cures my S mode 2-3 rough shifts at 4k RPM.

mbprince

I just did it to the E55 and the SL55 !!! Haven't driven them yet, but am looking forward to it.

I wonder if this works on my daughters '02 C230 Kompressor ??

Awesome info - as always !!

jctevere

This procedure resets the TCU (transmission control unit) NOT the ECU. The difference is that the TCU is responsible for the "adaptive driving characteristics" which pretty much creates a profile based on your driving.

So if you reset the TCU, its pretty much deleting the driver profile and reverts back to "standard settings". Which is why throttle response and driving aggressiveness is increased. However, if you keep driving like a granny, eventually you will have to reset the TCU again.

commops7

I just tried this on my '08 S63, will know more after the roads dry ..... also pulled the carbon air filter inserts out. If trans continues to be a problematic upshifter (see my other post from yesterday), im going to dealer to demand updates and an adaptation reset!? After that, it'll hopefully be tuned ECU update time.

Mackhack

Adaption reset via Star Diagnosis should only be used as a last method. This can make the shifting process even worse.

skratch77

this does not do anything with the tcu or anything to do with adaptations.

It resets throttle mapping in the tune and sets it back to zero.If you beat the living hell out of your car and put it in park and hardly tap the gas right after the revs shoot up like you floored the pedal to the floor,but if you drive it like a baby for 20 min after the revs will hardly move with the same throttle input.this trick basically resets the dulled down throttle sesnsitivity it learns with how much your foot is applied for every day driving.

underdogg

So a person like me that don't drive my car but on weekend .will i have to reset it every time I drive it..

commops7

Yep, I tried this and see no major improvement, well, at least for my upshift problems,so off to dealer I go.

Mackhack

I know that and I never said that. I was referring to his question if he should get a adaptation done. The TCU reset with key and gas pedal is different from a gearbox adaptation done via Star Diagnosis and again, one should only get this done if he has severe issues with the gears.

skratch77

The reset in this thread has nothing to do with the TCU.it resets throttle mapping in the ecu tune.

skratch77

Like I said this is not correct and does not touch adaptations or the TCU it resets throttle mapping on the adaptive part of the ecu tune.

commops7

someone else on another thread informed me to have the shift solenoid replaced; so I added this on my list of to do's when the car gets to the dealership. For my case, getting the adaptations reset as well as any missing updates applied should hopefully resolve my upshift problems. This thread this has value, as it does show people how to reset what you could, say, on the softer side of parameters, to relearn the driving habits of the person behind the wheel. I apologize if I inadvertently hijacked the thread :-)

Mackhack

I call this B/S!!! The OP confused TCU and ECU. If you do the key/gas pedal reset, it resets the TCU's learned shifting curve, NOT "ECU anything".

The TCU adapts your driving style and takes average values from the first 40 shifting points then safes them. It also adapts throughout driving and keeps adapting it to your driving style. If you keep slamming the gas pedal the shifting will become more aggressive, if an 80 year old barely pushed the pedal to the metal and barely reaches 5th gear, this car will act sluggish in shifting the gears.

Believe it or not! I can care less.

skratch77

OK bro you post in here on what you think its doing and again say you talked to some mb engineers and they don't even know what it does and I just told you.it resets throttle mapping in the tuning.

This is straight from kleemann engineering that can rewrite the TCU to accept different gearing and someone that knows a hell of a lot more **** than your spillng in this thread.this has nothing to do with tranny adaptation and you can even scan the TCU to see that the values don't change and the car feels faster even if your not changing gears like if your in m3 the car rips with a slight throttle input.

I can pm you the chat I had with a real tuning engineer at kleeman that might explain it to you a little better.

Mackhack

Yes I did talk to them about this because I'm originally from Stuttgart and worked for MB before and some of the engineers are friends of mine. I believe what they say (they are the ones who worked on that stuff with their suppliers obviously).

You can send me what you got in a PM though. Let's see what Kleeman has to say.