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I have a recent problem for which either I think my ECU needs to be repaired or I need to get an alternative virginized ECU with the default c250 w204 engine map. (Basically get misfires at the end of my rpm band and an odd error on my PTS system in Xentry that seem to be tell tale signs. Also tried out another c200's ecu and it didnt misfire but im assuming because of the engine map)
Can anyone do either or in LA? (I am visiting for 10 days end of March '25 and can bring my ECU with me)
I have a recent problem for which either I think my ECU needs to be repaired or I need to get an alternative virginized ECU with the default c250 w204 engine map. (Basically get misfires at the end of my rpm band and an odd error on my PTS system in Xentry that seem to be tell tale signs. Also tried out another c200's ecu and it didnt misfire but im assuming because of the engine map)
Can anyone do either or in LA? (I am visiting for 10 days end of March '25 and can bring my ECU with me)
There are a number of things accessible in Xentry developer mode that affect turbo boost, waste gate actuation, accelerator pedal/throttle body response curve, etc. Going deeper, like changing the pre-programmed functions or flashing new software takes a program that can acccess the ECU below the operating system level. I have heard names like Vediamo and Monaco, but don’t have any real knowledge at that level.
When the M271 EVO showed up in the facelift C250 a fair number of inventive folks realized that by playing with the ECU and even some things accessible through the engineering menu, the C250 could be set up to be quite quick. The trade off was some unpleasant characteristics under certain conditions. When I first got my ‘13 C250 it had been “tampered with.” It jumped so quickly at the first touch of the accelerator that I had to be careful not to run into the car ahead of me. However, after hard acceleration the engine felt like it was going to shut down when the pedal was released. My local Indy MB shop reset it back to factory settings and it was a much nicer drive. Since you know Xentry, maybe you can do that yourself if you can get the original parameters.
Many MB specialists shops can do work with Xentry. Only a few can go deeper than that. I have a family friend who races Audis and his coder does bench programming on their ECUs. He doesn’t do Mercedes at that level, but I haven’t needed it. If you need this level of help, I suggest looking for a shop that is also involved in competition.
2015 SL400 (M276 Turbo), 2014 C350 Sport (M276 NA), 2004 SL500 (M113), 2004 Audi TT225 (BEA)
Originally Posted by Odd Piggy
There are a number of things accessible in Xentry developer mode that affect turbo boost, waste gate actuation, accelerator pedal/throttle body response curve, etc. Going deeper, like changing the pre-programmed functions or flashing new software takes a program that can acccess the ECU below the operating system level. I have heard names like Vediamo and Monaco, but don’t have any real knowledge at that level.
When the M271 EVO showed up in the facelift C250 a fair number of inventive folks realized that by playing with the ECU and even some things accessible through the engineering menu, the C250 could be set up to be quite quick. The trade off was some unpleasant characteristics under certain conditions. When I first got my ‘13 C250 it had been “tampered with.” It jumped so quickly at the first touch of the accelerator that I had to be careful not to run into the car ahead of me. However, after hard acceleration the engine felt like it was going to shut down when the pedal was released. My local Indy MB shop reset it back to factory settings and it was a much nicer drive. Since you know Xentry, maybe you can do that yourself if you can get the original parameters.
Many MB specialists shops can do work with Xentry. Only a few can go deeper than that. I have a family friend who races Audis and his coder does bench programming on their ECUs. He doesn’t do Mercedes at that level, but I haven’t needed it. If you need this level of help, I suggest looking for a shop that is also involved in competition.
I think Developer Mode applies to DAS, the predecessor to XENTRY and is used on older cars. XENTRY has two modes: Online and Offline. Unless you have a subscription and passcode to use XENTRY online, you are stuck using it offline, which limits how much configuration you can do. Unless the OP has an online account, it is unlikely he can make the kinds of changes needed.
With regards to DTS Monaco and Vediamo, I'd leave that to folks who know what they are doing. Otherwise you can brick your car. Not sure where the OP got his XENTRY setup, but many Asian sources will sell those tools along with the XENTRY software. This is a situation where BenzNinja can really help and do it remotely. He's not a tuner, per se, but may be able to load the ECU with a factory file.
Definitely not recommending to use advanced programming tools on the OP’s ECU.
But if he’s got the know how and familiarity to use Xentry he could reset things back to factory if the operating system hasn’t been modified.
What I was told by a shop owner who was factory trained in Germany was that the M271 had to be individually tuned before delivery and each one had a set of parameters for proper performance. On mine the throttle curve and the WOT performance settings had been modified.
I don’t personally go there. I do PM and minor/mid mechanical repairs on our fleet.
I toyed with the idea of vediamo but I really have never coded an ecu before (I’m a software programmer otherwise) and don’t want to do an experiment without a backup ecu.
Yea maybe reset to default might do the trick. Thanks for the suggestion !
As for the xentry setup I managed to get the 09/2014 software off the forum, refurbd a d630 and my mechanic had an old c3 that I was able to hook up the car and computer with.
Originally Posted by Odd Piggy
There are a number of things accessible in Xentry developer mode that affect turbo boost, waste gate actuation, accelerator pedal/throttle body response curve, etc. Going deeper, like changing the pre-programmed functions or flashing new software takes a program that can acccess the ECU below the operating system level. I have heard names like Vediamo and Monaco, but don’t have any real knowledge at that level.
When the M271 EVO showed up in the facelift C250 a fair number of inventive folks realized that by playing with the ECU and even some things accessible through the engineering menu, the C250 could be set up to be quite quick. The trade off was some unpleasant characteristics under certain conditions. When I first got my ‘13 C250 it had been “tampered with.” It jumped so quickly at the first touch of the accelerator that I had to be careful not to run into the car ahead of me. However, after hard acceleration the engine felt like it was going to shut down when the pedal was released. My local Indy MB shop reset it back to factory settings and it was a much nicer drive. Since you know Xentry, maybe you can do that yourself if you can get the original parameters.
Many MB specialists shops can do work with Xentry. Only a few can go deeper than that. I have a family friend who races Audis and his coder does bench programming on their ECUs. He doesn’t do Mercedes at that level, but I haven’t needed it. If you need this level of help, I suggest looking for a shop that is also involved in competition.
Originally Posted by JettaRed
I think Developer Mode applies to DAS, the predecessor to XENTRY and is used on older cars. XENTRY has two modes: Online and Offline. Unless you have a subscription and passcode to use XENTRY online, you are stuck using it offline, which limits how much configuration you can do. Unless the OP has an online account, it is unlikely he can make the kinds of changes needed.
With regards to DTS Monaco and Vediamo, I'd leave that to folks who know what they are doing. Otherwise you can brick your car. Not sure where the OP got his XENTRY setup, but many Asian sources will sell those tools along with the XENTRY software. This is a situation where BenzNinja can really help and do it remotely. He's not a tuner, per se, but may be able to load the ECU with a factory file.
2015 SL400 (M276 Turbo), 2014 C350 Sport (M276 NA), 2004 SL500 (M113), 2004 Audi TT225 (BEA)
I cannot find any DTC 415000 in XENTRY under motor electronics (ME), your fuel pump (FSCU), or parking (PTS). Of course, without your VIN or full model number, I could be looking at the wrong car. Are you sure that is the code?
I cannot find any DTC 415000 in XENTRY under motor electronics (ME), your fuel pump (FSCU), or parking (PTS). Of course, without your VIN or full model number, I could be looking at the wrong car. Are you sure that is the code?
2015 SL400 (M276 Turbo), 2014 C350 Sport (M276 NA), 2004 SL500 (M113), 2004 Audi TT225 (BEA)
Interesting, there is no fault for the PTS listed as C41500 in XENTRY Simulation mode. It skips from "B" (body) codes to "U" (network & vehicle integration) codes. There are no "C" (chassis) codes.
The problem does seem to be with the ESP module. But there is not trouble code there either.
2015 SL400 (M276 Turbo), 2014 C350 Sport (M276 NA), 2004 SL500 (M113), 2004 Audi TT225 (BEA)
Since your misfire seems to be limited to Cylinder 3, I would focus on trying to solve that problem first. Look at the info under the P030300 code. The supplemental information may provide a clue. Otherwise, I would first move the coil and then the spark plug to see if the problem moves or stays on cylinder 3.
happens on cylinder 2 too. I can put up pdf data here after a scan if that helps.
have tried the moving of the coils and plugs even put brand new ones in but no luck in solving this
Originally Posted by JettaRed
Since your misfire seems to be limited to Cylinder 3, I would focus on trying to solve that problem first. Look at the info under the P030300 code. The supplemental information may provide a clue. Otherwise, I would first move the coil and then the spark plug to see if the problem moves or stays on cylinder 3.
2015 SL400 (M276 Turbo), 2014 C350 Sport (M276 NA), 2004 SL500 (M113), 2004 Audi TT225 (BEA)
Does this only happen at WOT near redline? Could be a fueling issue, but I would think it would affect all cylinders. What rpm does this occur? This sounds like a physical problem. What engine did the other C200 have? Was it an M271 as well? What year? I'm surprise you could just swap ECUs since there must be a mismatch of immobilizers. Or am I wrong?
Happens around 6200-6500. Had the same m271 from 2012. Yea I was actually surprised that it worked too.
Originally Posted by JettaRed
Does this only happen at WOT near redline? Could be a fueling issue, but I would think it would affect all cylinders. What rpm does this occur? This sounds like a physical problem. What engine did the other C200 have? Was it an M271 as well? What year? I'm surprise you could just swap ECUs since there must be a mismatch of immobilizers. Or am I wrong?
415000 communication error. No tune. Yep want factory restore.
i have a c3 that connects over serial port
No tune....so the SW is not manipulated, why you want to load the factory SW?
If you only need to reset adaptation data, your Xentry can do with ease.
If any, can you post ESP fault code?
If no Fault code in ESP, regarding the ESP, the engine fault code produces a consequential flag in ESP for inducing the Limp mode, to limit the damage that can occur.
I would change spark plugs and follow the Xentry step by step test routine after choosing the fault code.
Anyway, this engine is far from being sporty and testing the upper range of rpm could be quite dangerous.
As far as I know there's no tune but I have only owned the vehicle for the past 2 years so just want to be sure.
Yea I did reset the adaptations but it made no difference apart from making it a bit faster, core problem remained.
No ESP faults. New spark plugs put in just a month ago.
Originally Posted by trigital
No tune....so the SW is not manipulated, why you want to load the factory SW?
If you only need to reset adaptation data, your Xentry can do with ease.
If any, can you post ESP fault code?
If no Fault code in ESP, regarding the ESP, the engine fault code produces a consequential flag in ESP for inducing the Limp mode, to limit the damage that can occur.
I would change spark plugs and follow the Xentry step by step test routine after choosing the fault code.
Anyway, this engine is far from being sporty and testing the upper range of rpm could be quite dangerous.
If the misfire came a month ago too, I would check the WIS document regarding the torque needed for spark plugs, as on high pressure ( CGI) gasoline injection the spark can be easily estinguahied if the spark plug is wrongly facing the injector, of course if the sparks plugs is not some "performance" selenar material made in Japan street, Guangdong province.
Anyhow, there is 2 types of misfires, electrically and combustion. Xentry can guide you very well.
2015 SL400 (M276 Turbo), 2014 C350 Sport (M276 NA), 2004 SL500 (M113), 2004 Audi TT225 (BEA)
As trigital stated, XENTRY provides step-by-step diagnostic and test procedures. I would enter the "Customer Complaint" section and follow the decision tree to identify the areas to test. Then go to the test procedures and follow those. Beware that sometimes the procedures can get complex and may require special test equipment, but you need to determine that yourself.
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