Tumble flap issues, electrical problem
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Joined: Feb 2024
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W221 S500
Tumble flap issues, electrical problem
Hi, this my first post here but I have been reading a lot and fixing many problems so many thanks to you all. I am from Sweden so please forgive me if my writing is a bit off…
But now I got something I cannot figure out.
I have a 2007 S550 and had the tumble flap fault code last year. I replaced the intake with a new Pierburg, I also replaced the crank sensor, air mass meter, some seals and other bits n´ pieces that are wear parts and should be replaced at the mileage.
But the intake isn´t working anyway, still got the codes P2005 and P2006.
I have checked the soleniods and they are working, 12v power from ecu is at the connector.
But I cannot measure any ground signal from the ecu. Not on the runner or the tumble flap signal pins.
So it looks like the ecu is not sending the ground signal to the solenoids.
Why? Which other signals or data are needed for the ecu to request tumble flaps and long runners?
I did the tests on an idling engine. From what I have read it should call for tumble flaps and long runners also when idling.
Is this wrong? But if it is, the codes should not be present right?
Regards
Jan
But now I got something I cannot figure out.
I have a 2007 S550 and had the tumble flap fault code last year. I replaced the intake with a new Pierburg, I also replaced the crank sensor, air mass meter, some seals and other bits n´ pieces that are wear parts and should be replaced at the mileage.
But the intake isn´t working anyway, still got the codes P2005 and P2006.
I have checked the soleniods and they are working, 12v power from ecu is at the connector.
But I cannot measure any ground signal from the ecu. Not on the runner or the tumble flap signal pins.
So it looks like the ecu is not sending the ground signal to the solenoids.
Why? Which other signals or data are needed for the ecu to request tumble flaps and long runners?
I did the tests on an idling engine. From what I have read it should call for tumble flaps and long runners also when idling.
Is this wrong? But if it is, the codes should not be present right?
Regards
Jan
Thread Starter
Newbie
Joined: Feb 2024
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W221 S500
So the ECU is toast? Nothing to do?
I was hoping there was something else affekting the control of the intake. Some other signals needed for the ECU to engage the intake functions.
If I can find a used ECU, does it need a lot of programming to adapt it to the car?
I was hoping there was something else affekting the control of the intake. Some other signals needed for the ECU to engage the intake functions.
If I can find a used ECU, does it need a lot of programming to adapt it to the car?
MBWorld Fanatic!
Joined: Aug 2014
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S500
real electronic whizz-kids can check it out and repair - loads do it all the time - but they charge silly money - these days there are better ECU clones out there for peanuts - but you need to get your info inside it - and that too is specialist fun and silly money
yep car won't run on a used one - till its sorted
yep car won't run on a used one - till its sorted
Last edited by BOTUS; Apr 9, 2025 at 05:15 AM.
Thread Starter
Newbie
Joined: Feb 2024
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W221 S500
Thank you for your answers.
Do you know of any good ECU clones? And where to get them, preferrably in Europe?
I have read about making a clone of my current ECU and then use it to program a new one. Is this the way to do it or is it better to do a "programming" directly into the ECU?
Do you know of any good ECU clones? And where to get them, preferrably in Europe?
I have read about making a clone of my current ECU and then use it to program a new one. Is this the way to do it or is it better to do a "programming" directly into the ECU?
Member
Joined: Jun 2024
Posts: 191
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E320
You're on the right track with your diagnosis — codes P2005 and P2006 point directly to intake runner control malfunction (bank 1 and 2). If you’re getting 12V power but no ground signal from the ECU to the solenoids, that suggests the ECU isn’t commanding the actuator circuit, which could be due to missing input data or an internal driver fault in the ECU itself.
The ECU typically won’t activate the tumble flaps at idle unless certain conditions are met. It looks at engine load, RPM, air temperature, throttle angle, and sometimes EGR or MAF data. So if the engine is just idling in closed loop with no load, it may not trigger the flaps — even though you’d expect it to based on a static test. That said, those codes should not be present if the flaps are operating correctly — so something is still being flagged as stuck or inoperative. If the ECU isn’t grounding the signal wire even under the right conditions, it could be due to internal damage (which can happen on these older ME modules) or a software corruption issue. I’d recommend running a full system scan to see if there are any additional fault codes in related modules — especially the ECM, TCM, or EIS — that could explain why the ECU isn’t issuing commands. I’ve had good results using the YOUCANIC full system scanner for this type of electrical issue — it not only pulls faults but also shows live data and actuator states, which is key for tracking ECU behavior when you’re not seeing the expected output.
The ECU typically won’t activate the tumble flaps at idle unless certain conditions are met. It looks at engine load, RPM, air temperature, throttle angle, and sometimes EGR or MAF data. So if the engine is just idling in closed loop with no load, it may not trigger the flaps — even though you’d expect it to based on a static test. That said, those codes should not be present if the flaps are operating correctly — so something is still being flagged as stuck or inoperative. If the ECU isn’t grounding the signal wire even under the right conditions, it could be due to internal damage (which can happen on these older ME modules) or a software corruption issue. I’d recommend running a full system scan to see if there are any additional fault codes in related modules — especially the ECM, TCM, or EIS — that could explain why the ECU isn’t issuing commands. I’ve had good results using the YOUCANIC full system scanner for this type of electrical issue — it not only pulls faults but also shows live data and actuator states, which is key for tracking ECU behavior when you’re not seeing the expected output.
MBWorld Fanatic!
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S500
well the site I thought had them doesn't seem to now - some of the fun and games
https://blog.uobdii.com/how-to-use-k...enz-me9-7-ecu/
https://www.obdii365.com/wholesale/b...new-cable.html
if you're in his club this guy is work his weight in gold... https://benzninja.com/
https://blog.uobdii.com/how-to-use-k...enz-me9-7-ecu/
https://www.obdii365.com/wholesale/b...new-cable.html
if you're in his club this guy is work his weight in gold... https://benzninja.com/
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Thread Starter
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Joined: Feb 2024
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W221 S500
Thanks.
I will run it a little bit more and see what other codes may appear together with the flap code and get back with the results.
Btw, when I clear a P2006 code it doesn´t come right back, even if it is a "current" code.
I´ll see if I can do some logging of the ground signal when driving the car. That might be a way to see if it is working under some conditions or not at all.
But before I drive too much I need to change the serpentine belt tensioner, it´s starting to squeel a little.
I will run it a little bit more and see what other codes may appear together with the flap code and get back with the results.
Btw, when I clear a P2006 code it doesn´t come right back, even if it is a "current" code.
I´ll see if I can do some logging of the ground signal when driving the car. That might be a way to see if it is working under some conditions or not at all.
But before I drive too much I need to change the serpentine belt tensioner, it´s starting to squeel a little.
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Thread Starter
Newbie
Joined: Feb 2024
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W221 S500
I have a iCarsoft CR Pro and it is probably not sufficient for this. I´ve been thinking of buying a Youcanic but they don´t have any retailers in Europe.
Are there any other good bi-directional scanners in the price range of a Youcanic or is a Xentry-system the best option?
Are there any other good bi-directional scanners in the price range of a Youcanic or is a Xentry-system the best option?
Senior Member
Joined: Mar 2018
Posts: 488
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2006 W221 S500L M273
Yes Xentry is best but also very complicated.
I got the LAUNCH X431 Creader Elite 2.0 BBA (Benz, BMW, Audi, VW) for €158 a while back.
It is bidirectional but i have not checked that it can activate the flaps.
I got the LAUNCH X431 Creader Elite 2.0 BBA (Benz, BMW, Audi, VW) for €158 a while back.
It is bidirectional but i have not checked that it can activate the flaps.
