Moto_Guzzi

Can't find the thread about this, remember reading the procedure and something about the 1st two gears.

Heres my experience with it.
The car was very smooth and changes at about 2000 revs lightfoot.

I recently took it for 20 000Km service, where upgrade was performed and L5 sensor replaced. Receiving the car it flies and changes roughtly in Comfort mode ref freely over 3000-4000 revs lightfoot in C.
Feels like S-mode without stiffness in suspension.

I then reset it:
1-Swith on.
2-Put foot hard on accelarator for 10 secs.
3-switch off, leaft key in ignition.
4-release foot from accellerator.
5-wait 5 min.

Now here comes the trick:It was fast and rough, I want it slow and smooth in C-Mode. For fast I use S-mode.

6-I then reverse out of garage, nothing noted.
7-Then I accellerate lightfoot forward down the road.
>The car then refs freely above 2000, but just after 2000 refs I lift foot completely off acellerator, it felt something happend.
8-Then I accelerate further to 2nd gear, after which it changed at 2000RPM from 1st, 2nd gear same thing, I release accelerator immediately after 2000 RPM.
9-Guess what, the car quickly learned, and was super smooth again in all gears in C- mode after that.

This all happened within 1 KM from home.
So it looks the 1st two gears are of significant importance initially after the reset.

Result. Driven 100Km so far no problem.
C-Mode super smooth as it should be and S-Mode fast as that should be.

Now this is for me and how I like it.

NOTE:I actually thought something was wrong with the car.

Mercho82

How do you know for sure that it worked?

Glyn M Ruck

Thats & throttle reset not an autobox reset. New 7G gearboxes with latest software have no reset capability. Just drive it hard if you want to change the response profile.

S & C buttons have zero effect on suspension. If you have advanced agility control you have a separate SPORT button. I understand that AAC is not available in the US?

Moto_Guzzi

Because of the complete change of feel accellerating in c-Mode, immediately noticible. I did just the opposite most would do. The 1st 2 gears are important.I have driven it from workshop to home and 300Km about, with no real change in feel.Now 1000km further it is still supersmooth.

I do have the Advanced Agility Control option, pad R18 000 for it.

Whatever I managed to "RESET" it made a clear noticible difference.

If I want it fast I just use S-mode, it remenmbers it in that catagorie.

supacrazykev

Yeah that's the throttle reset for the adaptive learning program. I heard after servicing your car, the dealers reset it. So you must have had a fat foot when you were on C-mode. When you got your car back. I sometimes experience an unsmooth change from 1st to 2nd on my CLK. What i realize is that you should let your car warm up before driving and when driving, make sure your engine is running at operating temperature around 80 degrees. Then you can drive roughly. This solved my jolt problem from 1st to 2nd because i used to just drive hard without the gears warming up.

Moto_Guzzi

So, is that the correct technical naming of what I am trying to talk about ?

Moto_Guzzi

I never drive fast when cold, IE for 1st 10Km's.

Glyn M Ruck

No - not really - over time the throttle pedal looses direct synch with the throttle body - becomes corrupt in the ECU so that full throttle pedal movement to WOT does not open the throttle plate fully. So you are not actually achieving WOT even though you pushed the pedal to the floor. This has nothing to do with resetting the learning function in the TCU. Old TCUs had volatile memory so tricks like cutting power to them that worked on the 722.6 5 speed auto don't work with the 7G - You need a STAR to cancel the TCU memory.

Correct procedure for throttle reset; Which is pretty much what you did. And yes it does make a clear and noticeable difference

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.

Glyn M Ruck

Sensible - the most wear takes place in an engine when it is cold. You also need to let your transmission & axle fluids get up to temperature.

Glyn M Ruck

Not true - see above.

Carsy

[QUOTE=Correct procedure for throttle reset; Which is pretty much what you did. And yes it does make a clear and noticeable difference

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.[/QUOTE]

Glyn, Does this proceedure hold for the 5 speed box on the 220CDI ?

supacrazykev

Oh yeah i forgot, but C-mode starts on 2nd gear instead of 1st gear.

Moto_Guzzi

What I like about this proceedure, is you can turn it either way quickly, just depends on how you treat your 1st two gears strait after your 1st pull away.....Off the gas for both 1/2nd gear and it is slow and smooth, floor it and it's fast.

For me I chose the slow, cause it fits perfectly with the suspension in Comfort Mode....Floor it in Sport Mode, where susprention is stiff.

nyca

The issue of the jerky transmission shifts, and the intial cold start rough 2-3 shift, is addressed in this W211 thread:

https://mbworld.org/forums/new-s-cla...n-shifts.html?

I wonder if the TSBs noted there apply to the W204?

My 2009 C3004M has the initial cold start 2-3 jerky shift issue - the very first 2-3 shift off a cold engine start is jerky, then its fine.

Glyn M Ruck

Hi squire - I missed this one. This proceedure has nothing to do with the transmission. On "drive by wire" throttles it resets the throttle pedal to the throttle actuator to ensure that full pedal movement achieves full throttle plate movement.

It does not apply to diesel engines.

Carsy

Thank you Glyn. I hope you watched the very entertaining rugby match a couple of weeks ago!!

Glyn M Ruck

Indeed I did

delirium

I tried the ECU reset by stomp pedal method and I think its a mental thing. I didnt really notice any difference, however I was more apt to step on the accelerator harder in order to have the ECU learn a more aggressive driving style... so i was driving faster, but the car behavior was the same as pre "reset"

albert101

I have the same problem on my car but i am an automatic c300. Were you able to get it fixed? What was causing the problem and what was the fix? Thanks!

OliverU

Is a reset possible if the car has keyless/push-button ignition?

albert101

Yes, you can just pull out the button to reveal the the key slot. Then just insert your key normally.