nidyanazo

This is a simple procedure. It will sharpen up your throttle response if you have been mostly driving slowly.


1. Turn the ignition key to the on (not start) position.

2. Press the gas pedal to the floor and hold for five seconds.

3. Turn the key to the "off" position (don't remove the key), then release the gas pedal.

4. Wait at least two minutes for ECU to reset.

danlnyc

best trick ever btw.

you can tell instantly

radride

I've done it before and I agree, best trick.

R.K.

Pmurray633

Will the computer give any kind of notification to me that the reset has been complete?

Blkvip

when i did it....i think it worked lol i didnt get any response

awiner

No you will not get any confirmation the reset worked.

zneB-sedecreM

On the contrary, you will get a 'confirmation' it's done and that it successfully worked, at least for both of the 2 different (05 and 06 MY) W215 CL AMGs I've had by now in my 22 year old age (totaled first one few years ago ) .... If you listen closely (BTW another hint: radio/COMAND should be pressed off, all windows closed, climate control off - basically you will be in the driver's seat waiting in silence the whole time - the dashboard will go blank and all <this method just sucks on a hot summer day if you have black leather and the cars been just sizzling inside dring the day lol and you can't have the AC on :/ >) after a full 2 minute wait, you'll hear a faint "tick/click" noise coming from the ignition/key area. Every time I do this, I always wait until I hear the "click/tick" to make sure it's done, and truthfully it always "clicks" after the full proper 2 minutes. I don't know if it varies from the 03/04 MYs with the "click" sound.
It's not a sound you normally hear from this car at all unless performing this reset Hope that helps clarify this ECU adaption reset just a little bit more
It might work without the noise, but if you hear it, YOU KNOW the ECU reset itself to adapt and learn your new shift/driving patterns.

I also heard, can't confirm this even tho I did try it. If you put in 100 Octane Race Fuel after using 93, and you perform this reset makes a difference as well.

pjdough

For what it's worth: I had to return my modified ECU and TCU for remapping in order to pass VA emissions. In my conversation with the techs, I asked about the reset you mention. They cautioned not to reset using the simple key - gas pedal method - although they wouldn't explain the whys. They recommended disconnecting both batteries or running hard for 50 miles (not sure where I have 50 miles to run hard my SL65 in Northern Virginia).

So, does anyone have an idea why the techs would warn against the more simple method?

chazcon

I don't know why they would warn against that (as if it would damage something). But I can tell you for a fact that resetting by disconnecting the battery gives you a vastly greater experience than the simple key method. I found this out when I accidently left my lights on at lunch and drained my battery, and had to jump start. Prior to this I had been resetting using the key method every Friday or Saturday :P When I drove home after draining my battery - holy hell I thought I was in someone else's CL, lol.

Blkvip

interesting. now why does the battery disconnect work better?

gocl55amg

Because when you disconnect the battery for around 60 sec it erases the short term & long term memory on the ecu. This way it takes longer for the ecu to learn your driving habits. Unlike the procedure posted at the begging of the thread witch only erases the short term memory.

ritzkelly81

[QUOTE=zneB-sedecreM;5531416]On the contrary, you will get a 'confirmation' it's done and that it successfully worked, at least for both of the 2 different (05 and 06 MY) W215 CL AMGs I've had by now in my 22 year old age (totaled first one few years ago ) .... If you listen closely (BTW another hint: radio/COMAND should be pressed off, all windows closed, climate control off - basically you will be in the driver's seat waiting in silence the whole time - the dashboard will go blank and all <this method just sucks on a hot summer day if you have black leather and the cars been just sizzling inside dring the day lol and you can't have the AC on :/ >) after a full 2 minute wait, you'll hear a faint "tick/click" noise coming from the ignition/key area. Every time I do this, I always wait until I hear the "click/tick" to make sure it's done, and truthfully it always "clicks" after the full proper 2 minutes. I don't know if it varies from the 03/04 MYs with the "click" sound.
It's not a sound you normally hear from this car at all unless performing this reset Hope that helps clarify this ECU adaption reset just a little bit more
It might work without the noise, but if you hear it, YOU KNOW the ECU reset itself to adapt and learn your new shift/driving patterns.

I also heard, can't confirm this even tho I did try it. If you put in 100 Octane Race Fuel after using 93, and you perform this reset makes a difference as well.[/

Will this work on a ml350 w164? It seems my fuel consumption is rediculous. Watching the range meter drop about 1km every 100m or so once the fuel gauge falls below 1/2

kk100

Does disconnecting the battery have any negative effects on any other systems in the car?

Dr Matt

You have to reset the auto close of the sunroof and windows after disconnecting the battery and it takes more like 30 minutes of being disconected to reset the computer. Instructions on resetting windows/sunroof open/close are in your owners manual. It takes about one minute and is done while sitting in your drivers seat so it is no big deal.

detabudash

does this reset also reset an upgraded ecu tune?

Dr Matt

Yes.

When I swapped to a Eurocharged tune I had to do the reset before my car would run right. I have done it a few times since the adding tune just because I was working on the car doing things I had to disconnect the battery for. Takes a few start cycles for the computer to adapt with the aftermarket tune as well.

detabudash

The ecu was tuned and reset by the prior owner. I like the idea of re-adapting to my driving style - but I don't want to lose any gains from the tune.

mercedes4ever

Disconnect battery Method


1. Make sure your steering wheel is not turned to either side.
2. Make sure your windows are all the way up
3. Make sure your sun roof is completely closed
4. make sure your parking brake is released
6. Turn off your stereo.
7. Make sure you have your stereo's Anti-theft code
8. Turn off your heat/AC blower
9. Turn off your lights
10. Make sure your doors are UNLOCKED.
11. READ THE WHOLE PROCEDURE BEFORE GETTING STARTED

Reset Steps:
Open your trunk and disconnect the negative side of your battery, wait 30 seconds and re-connect it back.

Post-Rest Steps

Turn the key to position 2 (DO NOT START YOUR ENGINE)

1. Resetting your windows: Bring down both windows at the same time by holding the switches just before the click that brings them down automatically. Once both windows are all the way down make both swithches click by pressing them all the way down. This lets the ECU learn that that is the end of the window track and it records it in memory. Do the same closing the windows by holding both switches and making them click once the windows are all the way up.

2. Turn on your blower and make both sides go to 72 deg. by pressing both up and down buttons at the same time. This will calibrate the ECU

3. Turn on your stereo and enter you stereo code. if you dont have it, you can forget about listening to the radio.

4. pull the sun roof all the way back and all the way forward then up and then down.

6. Turn all you lights on and off, including your fog lights

7. Turn the key back to position 0.

8. Turn on your engine. You will get 2 malfunctions, your ABS and ESP systems must be calibrated.

9. Calibrate your ABS and ESP systems by turning the steering wheel all the way to your RIGHT and then all the way to your LEFT. then bring it back to the middle. Notice the two yellow lights disappear from your dashboard.

10. Let your car run in idle for about 5 minutes and then take it for a spin. Remember your ECU is still getting all the readings from all the sensors on your car so drive slowly first then faster... and so on.. you are basically teaching your ECU how to handle your car.

ColinG

Does the key ECU reset work with a manual transmission?

radride

I'm not sure if this is a serious question....


R.K.

awiner

Of course not.

GezaBMX

Hi, I drive a 2003 CLK240. Does this ECU reset work for my model as well? Sorry but I'm new to the forum and to owning a Mercedes. I have a slight delay when I press the throttle and also I think consumption might be a bit higher. Will this help me? Or should I do the battery disconnect?

Geza

2006 CL500

Very interesting thread. Doesn't the ECU "learn" all this anyway?

principledchiro

The jist of the thread was the two methods of periodically clearing adaptive driving.

Alex.currie44

I learned a long time ago not to be afraid to ask the dumb question.
I thought about this on my walk so here goes.
I assume it does not matter what the selection is between Economy or Sport on the transmission while performing this step?
My car runs is E 85% of the time unless I want to show a smart *** kid who thinks a noisy exhaust makes is car fast that this 4100 lb beast can move too.
The default selection is Economy (not to be confused with ECO on the newer cars)
Thanks.