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Title: MSLUB zero'd but still getting insufficient flow codes Post by: digitalhippie on September 01, 2014, 07:31:36 PM Working on my 01 Allroad 2.7T, using 551L as a base file. Not tuning really at this point, just trying to get rid of some emissions codes. Set CDATR and CDATS to zero to remove the EGTs, and I set the MSLUB table to 0. But I'm still getting secondary air insufficient flow codes for both banks. What am I missing? The SAI pump, hoses, and combi-valves have all been removed... and 034 block-off plates installed.
On a related topic - I have a warm up catalyst code. Is there a way to code out just the pre-cats? Or do I have to code out the cat checks completely? Title: Re: MSLUB zero'd but still getting insufficient flow codes Post by: ddillenger on September 01, 2014, 07:32:44 PM You need to unplug the pump. Insufficient flow works both ways!
Title: Re: MSLUB zero'd but still getting insufficient flow codes Post by: digitalhippie on September 01, 2014, 07:34:11 PM Sorry, was just editing my post. Pump is gone, removed.
(http://i.imgur.com/WYyuhFZ.jpg?1) Title: Re: MSLUB zero'd but still getting insufficient flow codes Post by: digitalhippie on September 01, 2014, 07:46:24 PM Maybe I got my MSLUB wrong? Is there an XDF with that parameter defined?
Title: Re: MSLUB zero'd but still getting insufficient flow codes Post by: ddillenger on September 01, 2014, 07:47:39 PM Post the file you 00'd it. I will look.
Title: Re: MSLUB zero'd but still getting insufficient flow codes Post by: digitalhippie on September 01, 2014, 07:48:47 PM Attached. If I did something wrong, please let me know... trying to learn as much as I can here. Thanks for your help.
Title: Re: MSLUB zero'd but still getting insufficient flow codes Post by: ddillenger on September 01, 2014, 08:42:20 PM MSLUB is correct, which means I kinda doubt the codes-lol
Do you have a VCDS scan? Considering ESKONF is stock, I find it more plausible you have circuit codes and possibly just read it wrong? Title: Re: MSLUB zero'd but still getting insufficient flow codes Post by: digitalhippie on September 01, 2014, 08:43:47 PM I didn't save the scan. I'm sure the code will come back tomorrow...
Title: Re: MSLUB zero'd but still getting insufficient flow codes Post by: digitalhippie on September 02, 2014, 09:21:23 AM Returned as predicted
Tuesday,02,September,2014,12:18:56:14873 VCDS Version: Release 12.12.3 (x64) Address 01: Engine Labels: 078-907-551-AZA.lbl Control Module Part Number: 8D0 907 551 L Component and/or Version: 2.7l V6/5VT G 0001 Software Coding: 06752 Work Shop Code: WSC 87119 VCID: 336F614D010F718656F-5120 9 Faults Found: 17831 - Secondary Air Injection System; Bank 1 P1423 - 35-00 - Insufficient Flow 17819 - Secondary Air Injection System; Bank 2 P1411 - 35-00 - Insufficient Flow 17965 - Charge Pressure Control P1557 - 35-00 - Positive Deviation 16815 - Warm Up Catalyst; Bank 2 P0431 - 35-00 - Efficiency Below Threshold 16684 - Random/Multiple Cylinder Misfire Detected P0300 - 35-00 - 16688 - Cylinder 4 P0304 - 35-00 - Misfire Detected 16690 - Cylinder 6 P0306 - 35-00 - Misfire Detected 16689 - Cylinder 5 P0305 - 35-00 - Misfire Detected 17658 - Fuel Level too Low P1250 - 35-00 - Readiness: 0000 1000 So I definitely didn't read it wrong. Title: Re: MSLUB zero'd but still getting insufficient flow codes Post by: digitalhippie on September 02, 2014, 07:10:45 PM Any ideas?
Title: Re: MSLUB zero'd but still getting insufficient flow codes Post by: ddillenger on September 02, 2014, 08:08:50 PM Any ideas? MSLBAS 183CC Factor .4x Try 00'ing that. Title: Re: MSLUB zero'd but still getting insufficient flow codes Post by: digitalhippie on September 02, 2014, 08:33:43 PM Forgive my stupid question, but since that's not defined in the xdf I have...
Is that a scalar or table? How many bytes? Not sure what you mean about factor .4x? Title: Re: MSLUB zero'd but still getting insufficient flow codes Post by: nyet on September 02, 2014, 10:25:26 PM Forgive my stupid question, but since that's not defined in the xdf I have... Is that a scalar or table? How many bytes? Not sure what you mean about factor .4x? I'm assuming its a scalar from his description. The factor is what you put in the scalar def so TP/WinOLS converts it to a proper value for display Looks like it is 8-bit btw. Title: Re: MSLUB zero'd but still getting insufficient flow codes Post by: ddillenger on September 02, 2014, 10:34:11 PM Nye's right. Scalar, 8 bit. units are kg/h.
Sorry about that. Forget sometimes not everyone is an advanced user :) Title: Re: MSLUB zero'd but still getting insufficient flow codes Post by: digitalhippie on September 03, 2014, 04:57:14 AM Thank you both, I'll give it a shot
Title: Re: Post by: digitalhippie on September 03, 2014, 01:00:46 PM So I made that change, will see what happens. One thing I noticed, SAI readiness appeared to be set despite the DTC... maybe I just need to disable the DTCs?
Title: Re: MSLUB zero'd but still getting insufficient flow codes Post by: nyet on September 03, 2014, 01:05:50 PM No clue! Keep us informed.
Title: Re: MSLUB zero'd but still getting insufficient flow codes Post by: digitalhippie on September 05, 2014, 12:23:16 PM Well the MSLBAS change seemed to do it. Codes have not returned, SAI readiness appears to be set.
Title: Re: MSLUB zero'd but still getting insufficient flow codes Post by: metronet on September 13, 2014, 11:54:34 AM You need to unplug the pump. Insufficient flow works both ways! Sorry, a newbie question, what does it mean by "Insufficient flow works both ways" and could you share the reason why would disabling MSLUB & MSLBAS get rid of the insufficient air flows for the both banks? (My understanding is these codes were thrown when the front & rear O2 sensor readings have exceeded the upper limits?) I have been reading a lot on the forums here but can't seem to fully understand the differences between coding out rear O2 sensor vs, disabling SAI. Kindly point me towards the right direction, please? :) Title: Re: MSLUB zero'd but still getting insufficient flow codes Post by: k0mpresd on September 13, 2014, 02:25:03 PM if you dont know the difference between rear o2s and sai then you may have picked the wrong hobby or you only read the cover of the book.
Title: Re: MSLUB zero'd but still getting insufficient flow codes Post by: metronet on September 13, 2014, 03:22:04 PM if you dont know the difference between rear o2s and sai then you may have picked the wrong hobby or you only read the cover of the book. Thanks k0mpresd. Admittedly I tried to read the PDF "Bosch Motronic ME 7_ ME 7.1_ ME 7.1.1_ ME 7.5 System Strategy" attached in one of the topics but can't seem to figure out on my own so a little bit help is needed ;D I guess what I am trying to ask here is the pros and cons of "numbing the rear O2s" vs "disabling the SAI/readiness check" on a M/L box. My 2001 Allroad SAI system is physically deleted and getting the similar codes like digitalhippie: Code: Control Module Part Number: 4Z7 907 551 K Hence the question whether I should go with option 1 or option 2, or both...? 1: http://s4wiki.com/wiki/Tuning#Rear_O2_Sensors vs 2: http://s4wiki.com/wiki/Tuning#Secondary_Air_Injection Most interestingly (or at least to me) is the comment from ddillenger that the insufficient flow works both ways. I think it has something to do with the reason why setting MSLUB/MSLBAS to 0 also requires unplugging the SAI pump electrically to get rid of the insufficient codes (according to the option #2 in s4wiki). However, I do not understand the reasons behind it.... care to explain? Thanks! Title: Re: MSLUB zero'd but still getting insufficient flow codes Post by: ddillenger on September 13, 2014, 03:31:40 PM Insufficient just means the number is not as expected. Whether that be too low (typically) or too high.
As for SAI vs rear o2. they are different things :P You need SAI. Title: Re: MSLUB zero'd but still getting insufficient flow codes Post by: metronet on September 13, 2014, 03:43:23 PM Insufficient just means the number is not as expected. Whether that be too low (typically) or too high. As for SAI vs rear o2. they are different things :P You need SAI. Thank you ddillenger. I really appreciate your help. :D And so just to confirm that I understand it correctly: - In a simple SAI delete (only) tune; it is good enough to set MSLUB/MSLBAS to 0. - The ECU will continue to compare the 4 O2 sensors' outputs for pre/post cat efficiency minus the "cold start"? Is this correct? Cheers! Title: Re: MSLUB zero'd but still getting insufficient flow codes Post by: hopsis on September 14, 2014, 02:41:20 AM On a related note, I'm having some trouble trusting the SAI diagnostic in general. About a week ago I replaced the combi-valves with block-off plates in my C5 S6. I have a modified bin with the necessary changes done just waiting for a spare ecu to arrive. However I'm not getting any DTCs after the procedure. The pump is still connected and working. The piping is still there but the air is blown into the engine compartment. No codes.
This weekend I did a timing belt job on a friends '02 S6. Bone stock everything, SAI pump working, no leaks but "insufficient flow" codes and check engine light on. Couldn't figure out why, although I didn't really look into it more deeply. This babble wasn't mean't to be a question, just thinking out loud. It's quite possible that +10 year old cars (even Germans) do get electrical problems. Title: Re: MSLUB zero'd but still getting insufficient flow codes Post by: metronet on September 14, 2014, 12:33:32 PM As for SAI vs rear o2. they are different things I see what you guys are saying now. I thought the rear O2 sensor had something to do with the insufficient codes but clearly they are unrelated. Finally I am starting to read "SLS 88.150 (Seondary Air Control)" in the translated PDF. Thanks guys! ;D |