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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > N47 and N57 Turbodiesel Engine / Drivetrain / Exhaust Modifications > 244C00 Charging Pressure Too Low
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      02-17-2020, 10:03 AM   #1
zaynn786
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244C00 Charging Pressure Too Low

I have done some research following this one error that I am getting.
  • 244C00 - Charge-air pressure control, control deviation: charge-air pressure too low/positive control deviation

I took it to an indy who said that the Exhaust Pressure Sensor upstream of Turbo needs changing, and i got to this same stage in the test-plan using ISTA. It basically is not hitting the threshold consistently of 2500mbar and the difference between the charge being open and closed should be 1500mbar, and is sitting slightly lower than this. See graph attached:
View post on imgur.com


Vacuum pipes seem intact, intake seems to be OK, have tries changing MAP sensor, air filter and EPS before turbo with no luck.

Error is intermittent, happens under moderate acceleration, and usually clears itself from iDrive after a few miles when engine is warm. DTC still stored in error memory however. When fault is present, loss of power occurs, small turbo (?) not kicking in. My assumptions is that the pressure is not being held so it leads me to the pressure converters for the turbos. Any help would be greatly appreciated
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      02-17-2020, 11:15 AM   #2
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Has the intake tract been pressure smoke tested for leaks? This should be done.
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      02-17-2020, 11:35 AM   #3
zaynn786
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Quote:
Originally Posted by Enabled View Post
Has the intake tract been pressure smoke tested for leaks? This should be done.
I have not yet done a smoke test, however, I conducted the Air Soot buildup (i think that is what it is called) test plan which shows calculated air vs actual and the graph indicated that there is not a major issue - will upload once i get a chance
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      02-17-2020, 12:12 PM   #4
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Are you thinking the pressure sensor is at the correct pressure but reading incorrectly? Or that the pressure is too low and it is reading correctly?
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      02-17-2020, 12:24 PM   #5
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Quote:
Originally Posted by AlpineX View Post
Are you thinking the pressure sensor is at the correct pressure but reading incorrectly? Or that the pressure is too low and it is reading correctly?
Taking into consideration that I have tried swapping the MAP and EGP sensor and the fault still persists suggests that the sensors are reading the correct value, so itís pointing towards the pressure is actually too low.
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      02-17-2020, 12:45 PM   #6
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The pressure sensor upstream of the turbo is somewhat removed from charging pressure.
EGR not fully closing when it is supposed to? Did you reset adaptations of MAF? Any leakage in the pressure hose or connection to the EGP?
Or are you thinking there is not enough air pushing through the engine to reach the 2500 like a snowball effect?

What's your mileage?
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      02-17-2020, 12:54 PM   #7
zaynn786
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The exhaust pressure being too low will effectively lead to charging pressure being too low as it wonít have the optimum pressure to turn the exhaust turbine, or am I wrong in saying that? Yes I did reset adaptations when I replaced the MAP (not MAF). As you suggest, the pressure could be low due to either the EGR valve not closing or the wastegate not closing properly. Are both EGR valves and wastegate valves controlled via the vacuum system? Car seems to be getting enough air as if it wasnít Iím sure I would be getting subsequent errors for the intake system. Currently on 70526 miles, it started very intermittent and now occurs every time I get into the car from cold, accelerating up to about 40mph and varies but usually about 2k rpm triggers the fault.

The EGP is attached to a hose, no visible leaks and I did prod it with a hanger to see if it was blocked but was all OK
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      02-17-2020, 01:12 PM   #8
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The pressure readings are operating normally when warm? EGR is utilized for rapid warm up in the older models, I assume same or similar for n57
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      02-17-2020, 02:04 PM   #9
zaynn786
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Iím not sure about readings whilst itís warm - ie driving, but after driving a short while it seem to hit the EGP threshold limit of 2500mbar, however the difference when the car is not under load does not hit the 1500mbar difference level by about 200mbar and states ďNot OKĒ and ends the test plan there

Also when completely warm the drivetrain error will rarely come back until I let the car rest for a bit then drive again, it will intermittently come on which goes away with a few ignition cycles or driven a few miles

Last edited by zaynn786; 02-17-2020 at 02:13 PM..
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      02-23-2020, 05:00 AM   #10
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Quote:
Originally Posted by AlpineX View Post
The pressure readings are operating normally when warm? EGR is utilized for rapid warm up in the older models, I assume same or similar for n57
Bimmerlink has updated its iOS app to show EGP before turbo which is helpful however i now have another code showing error for the actual EGP. Does anyone know what the calculated pressure should be?
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      04-17-2020, 07:38 AM   #11
zaynn786
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Bump, anyone have any data for the EGP Sensor?
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      04-17-2020, 11:24 AM   #12
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I will try to see if I have EGP sensor available in the app I use this afternoon. The boost pressures are about right, mine are at 100 kPa (1 bar) at idle. They increase significantly with greater acceleration. But I know exhaust pressure is what you're looking for, if I have it, I will graph it and get it to you on same graph with RPMs.
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      04-17-2020, 11:29 AM   #13
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Quote:
Originally Posted by eugene89us View Post
I will try to see if I have EGP sensor available in the app I use this afternoon. The boost pressures are about right, mine are at 100 kPa (1 bar) at idle. They increase significantly with greater acceleration. But I know exhaust pressure is what you're looking for, if I have it, I will graph it and get it to you on same graph with RPMs.
Thank you, much appreciated. The boost pressure seems to be ok till about 1.6bar, beyond this it struggles to reach anything above 2.0bar. However the EGP is a new error and just needed some good readings to compare against.
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      04-17-2020, 06:03 PM   #14
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Well, the only exhaust pressure sensor I have available in the app I use is Exhaust Pressure Sensor Bank 1. It reports results in kPa which are tremendously low. What I think I will try to do is connect my laptop to the car to cross reference the sensor. I think the app reports the exhaust pressure in ba over barometric pressure. The barometric pressure sensor reported ambient pressure at exactly 100kPa or 1 bar.

Does it make sense for the pressure to be 1.45 bar at idle 780 RPM and rise to 1.95 bar at its highest at around 2400 RPM?

Edit: The app really reduces image size. I uploaded original here https://ibb.co/kG7Mvds
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      04-20-2020, 06:34 AM   #15
zaynn786
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Quote:
Originally Posted by eugene89us View Post
Well, the only exhaust pressure sensor I have available in the app I use is Exhaust Pressure Sensor Bank 1. It reports results in kPa which are tremendously low. What I think I will try to do is connect my laptop to the car to cross reference the sensor. I think the app reports the exhaust pressure in ba over barometric pressure. The barometric pressure sensor reported ambient pressure at exactly 100kPa or 1 bar.

Does it make sense for the pressure to be 1.45 bar at idle 780 RPM and rise to 1.95 bar at its highest at around 2400 RPM?

Edit: The app really reduces image size. I uploaded original here https://ibb.co/kG7Mvds
Which app do you use? Do you have a 335d also. I think your values are correct
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      04-20-2020, 07:09 AM   #16
eugene89us
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Quote:
Originally Posted by zaynn786 View Post
Quote:
Originally Posted by eugene89us View Post
Well, the only exhaust pressure sensor I have available in the app I use is Exhaust Pressure Sensor Bank 1. It reports results in kPa which are tremendously low. What I think I will try to do is connect my laptop to the car to cross reference the sensor. I think the app reports the exhaust pressure in ba over barometric pressure. The barometric pressure sensor reported ambient pressure at exactly 100kPa or 1 bar.

Does it make sense for the pressure to be 1.45 bar at idle 780 RPM and rise to 1.95 bar at its highest at around 2400 RPM?

Edit: The app really reduces image size. I uploaded original here https://ibb.co/kG7Mvds
Which app do you use? Do you have a 335d also. I think your values are correct
I use Car Scanner ELM OBD2, it is available for both iPhone and Android, as far as I can tell. I have Android, so Bimmerlink is not available. The one I use is free with certain limits, but all sensors are accessible in free app to view.

I have 328d with 4 cyl N47T engine.
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      04-22-2020, 09:47 PM   #17
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More data with Bimmerlink this time. I have RPM close to idle coming to a stop 1.08 bar, cruising at highway speeds 1.32 bar, and lastly quickly accelerating up to 3.57 bar. That is Exhaust Pressure before turbo.
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      04-23-2020, 08:48 AM   #18
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Another set of data points from this morning - rainy day, so did not take any screenshots. However, to compare boost pressure to EGP:

In my N47, EGPs are ALWAYS higher than boost pressures, but not significantly. Variation is usually EGP 0.05-0.1 bar higher than boost pressures. Boost pressures respond in the same way as EGP to "throttle" - very comparable graphs with no noticeable deviation. Boost pressures read around 1.02 bar at idle, 1.2 bar cruising at 70 mph, and 3.4 bar when giving throttle for quick 60mph to 70mph highway acceleration. So I would imagine your boost and EGP should respond in the same way and should rise well over 2bar on quick acceleration. Hope this helps. Let me know if you need any more data points, I realize we have different engines, but maybe this helps to pinpoint the issue.
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      04-27-2020, 12:19 PM   #19
zaynn786
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Quote:
Originally Posted by eugene89us View Post
Another set of data points from this morning - rainy day, so did not take any screenshots. However, to compare boost pressure to EGP:

In my N47, EGPs are ALWAYS higher than boost pressures, but not significantly. Variation is usually EGP 0.05-0.1 bar higher than boost pressures. Boost pressures respond in the same way as EGP to "throttle" - very comparable graphs with no noticeable deviation. Boost pressures read around 1.02 bar at idle, 1.2 bar cruising at 70 mph, and 3.4 bar when giving throttle for quick 60mph to 70mph highway acceleration. So I would imagine your boost and EGP should respond in the same way and should rise well over 2bar on quick acceleration. Hope this helps. Let me know if you need any more data points, I realize we have different engines, but maybe this helps to pinpoint the issue.
Thanks for your help - I managed to get it sorted. It was the pressure converter for the turbo bypass valve. Was not functioning correctly so boost pressure was leaking through this and in turn would not hit the desired exhaust pressure either.
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      04-27-2020, 03:45 PM   #20
eugene89us
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Quote:
Originally Posted by zaynn786 View Post
Quote:
Originally Posted by eugene89us View Post
Another set of data points from this morning - rainy day, so did not take any screenshots. However, to compare boost pressure to EGP:

In my N47, EGPs are ALWAYS higher than boost pressures, but not significantly. Variation is usually EGP 0.05-0.1 bar higher than boost pressures. Boost pressures respond in the same way as EGP to "throttle" - very comparable graphs with no noticeable deviation. Boost pressures read around 1.02 bar at idle, 1.2 bar cruising at 70 mph, and 3.4 bar when giving throttle for quick 60mph to 70mph highway acceleration. So I would imagine your boost and EGP should respond in the same way and should rise well over 2bar on quick acceleration. Hope this helps. Let me know if you need any more data points, I realize we have different engines, but maybe this helps to pinpoint the issue.
Thanks for your help - I managed to get it sorted. It was the pressure converter for the turbo bypass valve. Was not functioning correctly so boost pressure was leaking through this and in turn would not hit the desired exhaust pressure either.
Great news. Appreciate the update!
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      05-06-2020, 08:52 AM   #21
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@Zynn786 and eugene89us - Thanks for posting this, I have been getting this exact same thing for years now in my 535D, never really caused much of a problem so left it alone as the list of possible causes was large! I just got fed up with it again and happened on your post which will be great for helping me investigate.
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      10-16-2020, 01:09 PM   #22
zaynn786
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Problem got fixed in April, and has returned with the same codes, charging pressure too low and EGP deviation. Changed pressure converter for one turbo wastegate, I suspect the other turbo is now exhibiting the same problem. Will update as I go
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