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Old 10-11-2013, 11:59 AM   #1
new//M3fan
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E46 emmision variants and how to

*ROUGH DRAFT*

10.11.13 -- 0.9
10.11.13 -- 0.9.1 - added State Inspection OBDII Reports section

*This write up (software versions, variant codes, etc) applies to MS43 M54B30 equipped E46's for now.

Most of you know it is now possible to flash different exhaust emission standards. However, what is not documented is how to actually deal with the specific VO's that are documented below.

EU4 - 7545670

For vehicles with:
EU4 exhaust emissions standard (S167A) = Yes

EU3 - 754670

For vehicles with:
EU3 exhaust emissions standard (S169A) = Yes

EU2 - 754671

For vehicles with:
EU2 exhaust emissions standard (S168A) = Yes
Or:
Without catalytic converter (S199A) = Yes
Or:
Data record without EOBD (S861A) = Yes

What does this mean? it means that if you flash 754670 into a US spec car it will default to EU4 instead of EU3. This how to will show how to choose between EU3, EU4 and EU2.

EU4

Simply flash the ZUSB.

EU3

Remove Secondary Air Pump relay underneath glove box.

EU2

Remove Secondary Air Pump relay.
*Remove fuse #4 (EF4) on the fuse holder inside the DME box.

Fuse Holder

EF1 = 30A, MAF, Cam sensor #1, DME, T-Stat, Evap emission valve (some say it's 30A - DME, Injectors, SMG Hydraulic unit)

EF2 = 30A, Fuel injectors, Both Vanos solenoids, Cam sensor #2, SAS pump electrical valve (some say it's 30A - DME, Idle control valve, Fuel tank ventilation valve, Fuel pump)

EF3 = 20A, Cam sensors, MAF, Crank Sensor, Heated O2 sensors (some say it's 30A, others say 25A - E-box fan, Transmission RPM sensor, CPS, MAF sensor, Fuel pump relay, SAP relay, A/C Compressor relay, Fuel tank leakage diagnostic module, SMG selector lever)

EF4 = 30A, Oxygen sensors and oxygen sensor heater circuits

EF5 = 30A, Fuel Pump Relay

Now I haven't had a chance to study the WDS to figure out exactly what is ran on fuse 4. But based on how my test vehicle performs it leads me to believe this fuse is for the post cat 02 sensors and heater circuits. While EF3 handles the pre-cat 02 sensors. What I am not 100% sure about yet is if the motor is still using the pre-cat 02 sensors to trim fuel. I do see the adaptive and multiplicative values updating. Again the WDS will confirm this. However, I think removing the fuse tells the DME to stop using the post cat 02 to further trim the fuel mixture which caused rough idle and hesitation when driving on my test car. (headers+no post cat sensors connected)

I was able to see the pre-cat 02 sensors fluctuate and work through INPA. didn't verify the posts since I had them disconnected and showed a steady .42 Volts.

Here's a link if you'd like to take a gander at the WDS and find out for me (Lazy) I' will find out when I eventually un-lazy myself...

http://www.bmw-planet.com/diagrams/release/en/

Final Step

After finishing the steps above go into INPA or GT1 and clear your adaptations ; that's it!

EU2 - Special Notes

Now through GT1 you will be able to access the test function "set idle mixture"
This will also tell you if the DME is in true EU2 mode as it typically throws an error if ran on the other variants.

----------------------------------------

State Inspection OBDII Reports

EU4 - SAP and catalytic 02 Sensors present and Ready. PASS
EU3 - SAP monitor N/A (not applicable) 02 sensors present and ready. PASS
EU2 - SAP monitor N/A (not applicable) 02 sensors (? not yet tested) EOBD not on. FAIL

EU2 - the EU2 software will require the EOBD ( engine light on key on ) to be manually coded into the DME via tuning methods for it to pass)) that is depending on how the 02 sensor heaters show up i.e N/A will pass, not ready will not.

Flash file with EU2 EOBD turned on
http://forum.e46fanatics.com/showthr...0#post15766530

The reason EU2 works flawlessly on cars with cats is because it's running a hybrid setup

I.E EU3 exhaust emissions standard (S169A) with the EU2 exhaust emissions standard (S168A) data map (tuning map) which I think is not ideal without a remap.

I will also open up a comprehensive DME tuning thread in the DME tuning subforum (similar to the one found in m3forums) when I start getting into tuning the test car.
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Old 10-11-2013, 12:09 PM   #2
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Finally. On the 26th my car will be running EU2. Working on getting an inspection here in NYS. From what i hear this will pass the computer test. Not worried about visual at this point. Since ill be running EU2 iv been looking for tuning for it also, since having no Catalytic converters, and 3" exhaust i want to try to gain the most from my NA power. Your last sentence you will be tuning using EU2 on a M54?

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Old 10-11-2013, 12:10 PM   #3
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Originally Posted by Llink78 View Post
Finally. On the 26th my car will be running EU2. Working on getting an inspection here in NYS. From what i hear this will pass the computer test. Not worried about visual at this point. Since ill be running EU2 iv been looking for tuning for it also, since having no Catalytic converters, and 3" exhaust i want to try to gain the most from my NA power. Your last sentence you will be tuning using EU2 on a M52?
No M54B30. You missed the big bolded red print at the beginning of my post...

EU2 as it is will not pass as is. Due to no CEL on when key on. That needs to be added later through coding into the ECU.
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Old 10-11-2013, 12:13 PM   #4
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Woops i did read. my brain knew m54. Brain typed 52. I have a 330i thats why im going euro. Will keep up with your work! really excited to see where this goes.
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Old 10-11-2013, 12:20 PM   #5
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Woops i did read. my brain knew m54. Brain typed 52. I have a 330i thats why im going euro. Will keep up with your work! really excited to see where this goes.
As soon as I get my hands on a A2L or DAMOS for the MS43. I'll get to it. Granted this will take a community effort since I can't do it all haha.

However finding the byte that turns on EOBD for the EU2 software version will be easy. Since the EU3 and EU2 share the same program version.
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Old 10-11-2013, 03:05 PM   #6
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I just ran a solid copper wire (insulated) from the oil light to the CEL. Just had to find the hot side of the solder points. passed inspection with EU2 on my 328i.
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Old 10-11-2013, 03:08 PM   #7
new//M3fan
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I just ran a solid copper wire (insulated) from the oil light to the CEL. Just had to find the hot side of the solder points. passed inspection with EU2 on my 328i.
That's a neat way to go around it. I want to eventually fix it through the software itself.
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Old 10-11-2013, 10:07 PM   #8
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Re: E46 emmision variants and how to

Yeah that woukd be a more reliable solution.

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Old 10-12-2013, 08:09 PM   #9
new//M3fan
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Yeah that woukd be a more reliable solution.

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I have found the address that controls that

http://forum.e46fanatics.com/showthr...0#post15766530
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Old 12-28-2013, 08:32 PM   #10
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I apologize if this is a stupid question, but is it possible to run EU2 on an M54B25?
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Old 01-06-2014, 05:24 PM   #11
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so, is it possible to run the engine without pre-cat 02 sensors? what about mixture?
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Old 01-06-2014, 07:31 PM   #12
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so, is it possible to run the engine without pre-cat 02 sensors? what about mixture?
I'd say no, not anywhere close to well. That's going off of what I know about other modern fuel injection systems, not these BMWs specifically. Never know, though, someone may come in here and surprise me.
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Old 01-07-2014, 11:02 AM   #13
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but what is the purpose having 02 sensors in a factory catless setup?
if you look on bmwfans.info there are screw plugs instead of 02 sensors (for vehicles without catalytic converter S199A)
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Old 01-07-2014, 12:28 PM   #14
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Pre-cat O2 sensors tell the engine how rich or lean it's running, so it can make corrections as necessary for optimum power and/or emissions. Otherwise known as a closed-loop control. Without any O2 sensors, you'd be running essential an open loop, where the ECU is basically operating in "eyes closed" mode guessing at its AFR based on the other inputs it can see. Possible, but not as accurate.
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Old 01-07-2014, 01:59 PM   #15
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correct. open loop. like engines in europe before EU2. engines were stronger than US versions because the only reason for 02 sensors is emissions. i remember my m30b34 had 218hp and m30b34kat had 182hp
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Old 01-07-2014, 02:08 PM   #16
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correct. open loop. like engines in europe before EU2. engines were stronger than US versions because the only reason for 02 sensors is emissions. i remember my m30b34 had 218hp and m30b34kat had 182hp
You mean post cat o2 sensors, right?


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Old 01-07-2014, 02:11 PM   #17
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no i mean pre cat sensors. post cat aren't something special. they monitoring cats efficiency
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Old 01-07-2014, 02:18 PM   #18
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no i mean pre cat sensors. post cat aren't something special. they monitoring cats efficiency
I mean pre cats are important, post cats are just monitoring the exhaust. An engine can't be too efficient without the monitoring capabilities of the pre cats.
I thought you were saying pre cats weren't important.


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Old 01-07-2014, 02:27 PM   #19
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what i'm saying is that pre cats are important because of the engine's management structure. which is all about emissions. mixture adaptation to keep lamda 14.7:1 constant has nothing to do with performance
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Old 01-07-2014, 02:43 PM   #20
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Oh, cool. That's interesting.


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