I have a problem that I hope someone can help me with.
I bought a maxiPRO MP808 and need help on how to use it to relearn my throttle positions, as I now have no throttle, almost like I am in limp home mode, and it crawls up hills and almost stalls, so serious issue.
I replaced the throttle pedal and throttle cable, removed rocker covers, new rocker cover gaskets, so also removed all electric connectors and battery etc.
New coil packs, plugs, leads.
Started the engine, and she purred, perfect tick-over and dropped down to about 650 rpm after engine was warm.
No dash lights on, everything seemed fine
I had what i thought was good throttle, but took off and no power, and foot hard to the floor.

Also delayed response to when I press the accelarator, to when it starts to give me the power, but then nothing to write home about.
I phoned Mercedes and they said it needs the throttle postion relearned via computer.
They want £99+£150 per hour on top to fix, and any parts they think are needed on top.

Mercedes told me about £1,000, here in Swansea, Wales, so I told them to do something not nice to themselves, greedy thieves.

I tried relearning every type of mercedes youtube video, but NONE work as this was to be expected.
I have to relearn the throttle postions, but I do not know how to.
Does anyone know how to use these diagnostic units to help me?

Also, I can hook up the unit and take screen shots of all the error codes

 

Can anyone help me out on these errors?

Do I clear them all, then re-do the whole thing and see what comes up, or will it be the same as these show?
I hvae an autel MP808, but also found out it cannot relearn mercedes throttle positions, bummer.


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History of how this issue started?
Mileage?
First check your battery and charging system - Alternator

Also, read thru this.

 

reading through the post you supplied, thank-you, will get back as soon as I run through the post.
This happened when i changed out the throttle cable and throttle pedal.
Back then, some months back as soon as i just changed the throttle pedsl and cable, I was left with what fells like limp home mode, but just no throttle when you press the throttle pedal, yet engine revs fully when you use the where the throttle cable attaches to the unit in the engine,.

The error codes etc, I have no idea about as the vehicle drove perfectly before I changed the throttle cable and pedal assembly.
This tells me I have done something to cause the system to forget or lose the throttle positions it needs to work.

I spoke to a merc, dealer yesterday and they said the vehicle just needs relearning on the throttle via the comp[uter letting them do it.

Vehicle is exactly only 75K miles.
No history of faults I know of.

 

Also brand new alternator just fitted, as last one died on way home, where I lost lights and a few problems.
New battery and alternator fitted, so definitely not these causing any problems I know about.

 

Throttle reset/re-learn procedure.
You followed this?

 

Three times tried this.
This time I am going to drive out of my single track mountain and forest roads and find a normal road as I deliberately floored it to see if this would give me power. Which it did for a bit, but then like a window opened, it flew off and dropped me back to no acceleration or power, just very slow pick-up and gearing changing at 2k revs, so limp home speed and power.
So I get full power for a moment in reverse or fisrt gear, then back to zero power.

I doubt finding a better road will help this problem of no power.
The second it comes to hill, which I have in abundance around me, almost 40 degrees are the norm up here and turns and twists that are death defying,
I used the manual over-ride on the box to shift down into second, it revs to 4-5k but no power or accelaration, 2nd gear, 3rd gear, 4th gear, all the same, I can get the revs, but zero power to pull me up the hills, so I have to sit it out and crawl.
I can get the vehicle up to 70MPH, but this is very hard and requires a straight or downhill road, and takes about 12 seconds to get there.

The vehicle has sat for nearly 6 months outside in extreme weather my end, 99% humidiy almost constantly.
The brakes were in a bad way,(Even though I fitted all 4 corners brand new, sensors, pads and discs, before i took her off the road) and the ABS light was on when I first started up the vehicle, but I know from experience as soon as the brakes are removed of rust and working again, the fault clears, and sure enough, as soon as I put the merc into reverse and tried climbing a steep bank with all 4 wheels trying to keep traction, this fixed this issue almost immediately.
Turned off the ignition, back on, and bingo, abs light now out and no faults showing. The light actually went out while in reverse as the fault was cleared, but i did the off and on again with the ignition to check the lights on the dashboard.
I have also now driven the vehicle for almost 10 miles and now the brake discs are pure clean and brakes are back to normal and ABS working as it should.
I checked the ABS simply by driving in mud and stone chippings slightly off road, and you can once again feel the pedal pulsing, trying to stop the skidding of the wheel.

I am now going to do a couple more things.
I am going to clear every error fault and code, one by one.
Then re-do the hard re-set of the adative gear change and this resets the ECU also.
Then go for a drive, plug in the MaxiPRO I have, which was very expensive, but seems to be lacking in basic functions for the Merc, yet has the advanced functions for all other makes of vehicles.
I will post back soon if any change in the data read-out from the Diagnostic scanner.
I also have other functions on the system, like live data, I also have access to the entire Autel system online and a full years subscription to there help centre, but still do not even know how to use this side of the unit yet.

I am old school mechanic from the 1980's and the most complex system I ever worked on back then were the BMW 2002 tii mechanical injection pumps, working on a cam and screw system for injecting the fuel into each cyclinder.
Electrics were a simple test with a meter, and wiring looms were a bit easier to track and trace faults in also.

I left the electrical side alone over the years and only kept up with the mechanical side, so am missing a load of years of knowledge in what i am trying to trouble-shoot this end, so thanks for all help and patience with me in this.

I just noticed while writing this, maybe I am reaching here, but it seems to be I have full power on take-off, then the second it gets to 2K revs it pulls back into limp mode.

 

Okay, now all errors are almost gone.
I unplugged every connector i touched in the removal of the rocker covers and replacing the alternator, battery, and the washer fluid bottle.
Also the error showing the open circuit on the headlights, which was simply I forgot to put the hid bulb back in when I rebuilt the headlights with new seals and polished the plastic lens, so the units look 100% brand new again.

Only other problem I have is it will not rev past 5k rpm on the throttle.
But under the bonnet, full throttle.
So this is leading me to belive the technician at Mercedes was right and I simply need the vehicle relearned on the throttle postions, which my unit cannot do.
He even gave me out the 5 tests they do.
I have no alternative now it seems but to visit my dealership. (Not the one I told where to go over the phone.
It was not the technician I slaggged off, the snotty telesales girl with her stinking attitude towards me and my carer when we asked for help from a mechanic, and after he finished she was still on the other phone line with me.
I told her she does not own or control the dealership, so what gave her the right to tell me who I can and cannot speak to in connection with my mercedes and she lost a customer for ever becuase of her two-faced stinking attitude towards me. (I used loads of french words on her)

I emailed the manager on Friday and he is livid and pleading with me to forgive the dealership, but i told him, no way, I do not deal with snobs ever, and get treated with contempt and anger for asking for help.

So thanks all for tryiing to help, but I have to trust the dealership and go with what he told me has to be done to fix my throttle problem and as my unit does other vehicles but not this mercedes model and version on throttle postion calibrations, I am now stuck.

The technician also told me they are NOT ever allowed to tell customers the re-setting procedures, like the one we all know on adaptive changing and re-setting this to be like new again.

 

Long shot, since there is no mention of any other codes.
and also do a STFT LTFT live scan and post your findings.

 

STFT LTFT does not register or mean anything to me here in the UK?

I have done a full vehicle scan and check of every module, sensor, air flow, % of O2, cats working, and way beyond.
I will slowly remove the data and upload the entire procedures, but we are talking pages of data and readings.
every electrical connection, washers, remote control door locks, and down to even a dodgy connection on one of the rear parking sensors.

I also remember from a lifetime of experience that 8/10 times older cars suffer simple bad connections, and the units and parts are all actually fine, but a garage will soon swap out parts to make money, knowing full well the connections were getting gritty and rusty and mucky.

I have all week-end to play and try other procedures to relarn this throttle for me.
But I was told by the technician that what has happened to me has to have the throttle postion sensor hooked up to a system to relearn the thing.
I told him about the re-set procedures and ways out there, but he simply said, NO, you can only fix it by relearning the throttle positions in %'s done via computer, and no way can I do a relearn via the ignition switch.
All this can do is reset the vehicle back to factory gear changing as the adaptive shifting gets out of kilter over time, but nothing to do with relearning the throttle postion and sensor used to control and monitor it.
I have two other throttle postion sensors here also, one new and one second hand, and the new one, now on, also no difference.

I lost the throttle the day I changed the throttle cable and pedal assembly, before i removed anything of the engine or air-flow and air cleaner system to get at the rocker cover gaskets.

 

STFT= short term fuel trim
LTFT= long tern fuel trim
ok, on your comments then so no need for this.
WRT the indies comments, the reset procedure forum members here and around have followed, including myself, numerous times, works. SO if you have shown the indie this procedure and he is saying contrary to this procedure, then I'd say he's out to lunch. But if he says there is only one other way to proceed, using STAR access only, then he's $elling you, imo.
There are countless threads on the re-learning process.
Personally, I take indie comments, always with a grain of salt.
Many are not trained on these older MBs - most (younger) indies are only trained with what's given to them by MB and only on newer MBs.
But they'll glad take all of your $$.

 

I hear what you are saying, but the relearn procedures did not work, and I have tried three different ones so far.
I also hear you over the mercedes garage telling me it has to be relearned via a computer.
I do not know what computer system they use present day.
So, in your words, what do you want me to try this end to relearn the throttle?
As at present reading only and no actual help is not helping me.
So what do you suggest I try now?

Also, what are you trying to tell me about fuel trim? as in how is this anything to do with me simply changing out a throttle cable?
Now you are confusing me, wether you are meaning to or not.

 

No there are not.
There are plenty of posts showing how to relearn throttle postions for gearchanging, not for lose of throttle at the pedal after changing out the throttle pedal and throttle cable.

Do you not think I tried all the methods in the forum and the internet before i came here to ask for help????

 

I have just found the answer on my AUTEL system.
It showed two possible fixes for the fault.
First one is to relearn the module, and along side it also tells you it may need reprogrammed if not able to relearn, which of course my AUTEL system cannot do for this model of mercedes.

I will find and post the actual screen I saw this on while hooked up with the AUTEL.

re-programming throttle postion sensors via a computer hook-up is all over youtube, and you see how they do it live.
I cannot do this, as my AUTEL system does not have this module installed, so a dealer will have to do this for me, or someone who can communicate with the sensor via there system.

So folks the mercedes garage and technician were NOT TALKING CRAP to me about my problem.
They knew instantly that it needs reprogramming, not relearning.

I am going to take the Merc. to a local tyre garage i know, who do MOT's and next door to them have a high-end tuning garage, where racing cars and rally cars are always being rebuilt or upgraded.
This is in a little tiny village called Crosshands, in Wales.
They will be able to hook into my merc and reprogram the sensor as this would need doing if they got the merc for an MOT , changed the throttle pedal and cable, and found the throttle stopped working properly.

I am going out to plug in my system to show you all the sensor fault and fix, showing it has to be re-programmed if not able to be relearned.
I am also surprised no-one in this forum knows anything about this wht-so-ever?
as in throttle position sensors can be reprogrammed to work.

 

would i be right in this thinking.
The throttle position senser works the throttle body, therefore the reprogramming is actually going to get the throttle body to respond to the throttle postion sensor, as in they are going to be matched up once again.

This seams the simplicity of what I have suffered.

 

to all who followed this thread, my loss of throttle after replacing the throttle cable and pedal coincided with the failure of the ETC/EGS module.
If you all look at the read-out above from the diagnostic scanner it actually shows and states the problem of why i have lost throttle and almost stuck in limp mode.
It shows it had a fault at an earlier time, and shows the earlier fault and current one right now.

P2001 - N15/3 ETC-Eletronic Transmission Control ETC/EGS Module Faulty.

All I have to do now is find it, as it is a right hand drive car, so not beside the throttle pedal assembly, as this houses a fuse-box on top of the engine main harness and fuse-box. (It might be hidden in there)
So maybe under the passenger side footwell, above the feet, as the left foot panel houses the bonnet catch handle and mechanism, so not in there.

So thread is finished and over and I have my problem and will get it fixed.

 

Here is the ETC module that is faulty in my ML.
I will work out how to get this fixed, either a new unit, or try to get a second hand one and get it programmed into my vehicle if possible.