C-Class (W203) 2001-2007, C160, C180, C200, C220, C230, C240, C270, C280, C300, C320, C230K, C350, Coupe

DIY Throttle Calibration?

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Old May 29, 2005 | 01:33 PM
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DIY Throttle Calibration?

Is there a DIY throttle reset? I heard it's been possible in other MB's, but can't find any info (searched already) for the W203's.
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Old Jun 3, 2005 | 07:53 PM
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Unhook the battery for about half an hour and it should allow the system to go back to default. It will relearn in 500 miles.
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Old Aug 20, 2006 | 01:16 PM
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It's been posted before in other forums, but thought I'd add this to our DIY stickies.
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.
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Old Aug 20, 2006 | 02:14 PM
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Originally Posted by Speedo
Is there a DIY throttle reset? I heard it's been possible in other MB's, but can't find any info (searched already) for the W203's.
Why dio you wnat to reset the throttle?
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Old Aug 20, 2006 | 03:19 PM
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Originally Posted by drexappeal
It's been posted before in other forums, but thought I'd add this to our DIY stickies.
What will excatly happen when you reset the ECU... Will the speeder respond be better if you drive the car harder the first 500miles?
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Old Aug 20, 2006 | 05:55 PM
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Originally Posted by drexappeal
It's been posted before in other forums, but thought I'd add this to our DIY stickies.
How do you know the reset was successfull?

Best Regards.
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Old Aug 20, 2006 | 06:00 PM
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I'm always a lil confused about the "on" position.

ON meaning position 1 or 2?
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Old Aug 20, 2006 | 10:00 PM
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Originally Posted by rubensans
How do you know the reset was successfull?

Best Regards.
Whenever I reset mine, I'll hear a "click" by the key hole exactly 3 minutes after I take my foot off the accelerator pedal. I've done this numerous times to see if it's consistent and it have been. I guess this must mean the reset worked. Otherwise, I have no idea or clue if it really worked.
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Old Aug 20, 2006 | 10:43 PM
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Originally Posted by bxtc
What will excatly happen when you reset the ECU... Will the speeder respond be better if you drive the car harder the first 500miles?
I'd like to know the answer to this as well.
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Old Aug 20, 2006 | 11:37 PM
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Originally Posted by diamondblak05
Whenever I reset mine, I'll hear a "click" by the key hole exactly 3 minutes after I take my foot off the accelerator pedal. I've done this numerous times to see if it's consistent and it have been. I guess this must mean the reset worked. Otherwise, I have no idea or clue if it really worked.
Do you leave the key in the whole time?
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Old Aug 21, 2006 | 01:00 AM
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Originally Posted by Gentlemanjim
Why do you want to reset the throttle?
???
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Old Aug 21, 2006 | 01:08 AM
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Is the throttle (or ECU) really being reset, or is it being "fooled" into thinking the car has been driven hard? Anyone?
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Old Aug 21, 2006 | 01:36 AM
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Originally Posted by pugguy2001
Do you leave the key in the whole time?
Yes, the key is left in the whole time.
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Old Aug 21, 2006 | 11:51 AM
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Originally Posted by rubensans
How do you know the reset was successfull?

Best Regards.
Tried it myself. Throttle response was much better.
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Old Aug 22, 2006 | 03:57 AM
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when you press the gas pedal to the floor and hold for five seconds are you suposed to also press the quick down?

Best Regards.
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Old Aug 22, 2006 | 12:12 PM
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Originally Posted by rubensans
when you press the gas pedal to the floor and hold for five seconds are you suposed to also press the quick down?

Best Regards.
Yup. All the way down (including the quick down-shift). I didn't do the wait 2-minutes after I completed the first 3 steps. I just took the keys out of the ignition and it still seemed to work for me.
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Old Aug 29, 2006 | 01:49 AM
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quick down? quick down-shift?

I'm confused now
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.

I thought these were the only steps, but we also have to press the quick down shift and quick down?

Thanks!~~ ^^

Last edited by necrotix; Aug 29, 2006 at 01:55 AM. Reason: to be more concise
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Old Aug 29, 2006 | 02:44 AM
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Originally Posted by necrotix
I'm confused now
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.

I thought these were the only steps, but we also have to press the quick down shift and quick down?

Thanks!~~ ^^
Quick down/Quick Down shift refers to the little extra amount the gas pedal goes down. When you push the accelerator down, there's an extra 'bit that you can push the accelerator down. This actually has functionality and down shifts the car when you want to accelerator.

Nothing to be confused about, just push down the accelerator as far down as you can.
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Old Aug 29, 2006 | 03:02 AM
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Thank you

I will do this right now~! puhaha
Thanks very much.
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Old Aug 30, 2006 | 01:30 PM
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I just performed the throttle reset and WOW!, did it ever wake up this car and so simple too. I wonder if the adaptive feature will require a reset periodically. Thanks for tip!
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Old Aug 30, 2006 | 01:39 PM
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after doing this, will you gas mileage decrease since it isn't used to your driving style anymore? just wondering.
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Old Aug 30, 2006 | 01:43 PM
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Originally Posted by SeanSBA
after doing this, will you gas mileage decrease since it isn't used to your driving style anymore? just wondering.
Time will tell, but to me a few mpg's is worth it

Last edited by Gentlemanjim; Aug 30, 2006 at 02:11 PM.
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Old Aug 30, 2006 | 02:17 PM
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Originally Posted by SeanSBA
after doing this, will you gas mileage decrease since it isn't used to your driving style anymore? just wondering.
I haven't noticed any significant drop off since I did it, but the car is definitely more responsive to my driving style.
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Old Sep 1, 2006 | 09:57 AM
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Thumbs up ECU Reset... Has anyone tried this procedure?

For those with automatic trannies, check out this thread on resetting the adaptive transmission and throttle settings...

https://mbworld.org/forums/w211-amg/148019-holy-crap-you-guys-sneaky-ecu-reset-works.html

I'm wondering if anyone has tried this on their W203? It should also work on our rides...

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.
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Old Sep 1, 2006 | 09:54 PM
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Yes. it works.. you need to "train" the ecu how you want to drive it again.
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