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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 09-22-2016, 11:25 PM   #1
VladBelsky
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Join Date: Mar 2014
Location: Buffalo, NY
Posts: 55
My Ride: '03 Franken325i/330i
MS45.1 DME conversion to MS43 DME

The point of this thread is to document some differences that should be known if one wishes to retrofit a Siemens MS43 DME into a vehicle that originally came with a Siemens MS45.1/MS45 DME.

Quote:
Originally Posted by alexxander.foster View Post

DME stands for Digital Motor Electronics. Its the European equivalent to ECU.

There were three versions of the Siemens DME offered with the e46 in North America, each with their own software packages which reflected the optional extras found in the car:
- MS42; used in the 323 and 328 M52TU engines
- MS43; used in the 325 and 330 M54 North American engines up to 03/2003; all 325xi
- MS45; used exclusively in North American for all M54 engines and SULEV engines produced after 03/2003; except all 325xi

The MS43 and MS45 have five harness connectors to handle the flow of data and power supply. They are referred to as "modules" and are numbered X60001 through X60005.
Parts you will need to swap from MS45.1 to MS43:

-DME (obviously)
-MS43 engine harness
-Transmission/O2 sensor harness, whether you have a manual or automatic transmission
-MS43 MAF (doesn't have built-in IAT sensor)
-IAT sensor (intake air temperature)
-MS43 O2 sensors
-Coil pack harness

You can re-use your MS45 coil pack harness if you repin it.

Differences between MS43 and MS45 coil pack harness:

MS43:
Pin Type

1) E Signal Ignition coil 3 Ignition coil 3
2) E Signal Ignition coil 2 Ignition coil 2
3) E Signal Ignition coil 1 Ignition coil 1
4) Not used
5) M Ground Ground connector
6) Not used
7) E Signal Ignition coil 6 Ignition coil 6
8) E Signal Ignition coil 5 Ignition coil 5
9) E Signal Ignition coil 4 Ignition coil 4


MS45:
Pin Type

1) A Activation Ignition coil 5 Ignition coil 5
2) Not used
3) Not used
4) A Activation Ignition coil 3 Ignition coil 3
5) M Ground Ground point
6) A Activation Ignition coil 1 Ignition coil 1
7) A Activation Ignition coil 2 Ignition coil 2
8) A Activation Ignition coil 4 Ignition coil 4
9) A Activation Ignition coil 6 Ignition coil 6

Connector part # if you break the connector from repinning is: 12521744624

Differences at module X60004 (DME-body)

Pin 2:
Unused on MS43
MS45: Activation, heating for fuel tank leak diagnosis module

Pin 5:
Unused on MS43
MS45: Ground Secondary air, hot-film air mass meter (MAF for SAP)

Pin 10:
Unused on MS45
MS43: Signal Fuel pump relay 1

Pin 15:
Unused on MS43
MS45: Signal Secondary air, hot-film air mass meter (MAF for SAP)

Pin 18:
Unused on MS45
MS43: Signal Valve, exhaust flap M54 3.0 l only

Pin 19:
Unused on MS43
MS45: Activation E-box fan (fan to cool ECU compartment)

Pin 23:
Unused on MS45 (SULEV/M56 models? Because they are automatic only)
MS43: Signal Clutch switch

Pin 25:
Unused on MS43
MS45: Signal EAC (Environmental Air Catalyst) sensor (SULEV/M56B25)

Pin 31:
Unused on MS43
MS45: Local CAN-bus low / Control unit for electronically controlled fuel pump (SULEV/M56B25)

Pin 35:
Unused on MS43
MS45: Local CAN-bus high / Control unit for electronically controlled fuel pump (SULEV/M56B25)

If I find any new info, or anything needs to be corrected, I will update the post accordingly.
__________________

2003 325i 5-speed
MS45.1 to MS43 converted
To be S52 swapped

Last edited by VladBelsky; 12-11-2016 at 01:27 AM.
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Old 11-24-2016, 02:36 AM   #2
Mflara20
Registered User
 
Join Date: Apr 2012
Location: Demorest Georgia
Posts: 1,119
My Ride: 04 330i
Quote:
Originally Posted by VladBelsky View Post
The point of this thread is to document some differences that should be known if one wishes to retrofit a Siemens MS43 DME into a vehicle that originally came with a Siemens MS45.1/MS45 DME.



Parts you will need to swap from MS45.1 to MS43:

-DME (obviously)
-Transmission/O2 sensor harness
-MS43 MAF (doesn't have build-in IAT sensor
-IAT sensor (intake air temperature)
-MS43 O2 sensors
-Coil pack harness

You can re-use your MS45 coil pack harness if you repin it.

Differences between MS43 and MS45 coil pack harness:

MS43:
Pin Type

1) E Signal Ignition coil 3 Ignition coil 3
2) E Signal Ignition coil 2 Ignition coil 2
3) E Signal Ignition coil 1 Ignition coil 1
4) Not used
5) M Ground Ground connector
6) Not used
7) E Signal Ignition coil 6 Ignition coil 6
8) E Signal Ignition coil 5 Ignition coil 5
9) E Signal Ignition coil 4 Ignition coil 4


MS45:
Pin Type

1) A Activation Ignition coil 5 Ignition coil 5
2) Not used
3) Not used
4) A Activation Ignition coil 3 Ignition coil 3
5) M Ground Ground point
6) A Activation Ignition coil 1 Ignition coil 1
7) A Activation Ignition coil 2 Ignition coil 2
8) A Activation Ignition coil 4 Ignition coil 4
9) A Activation Ignition coil 6 Ignition coil 6

Connector part # if you break the connector from repinning is: 12521744624

Differences at module X60004 (DME-body)

Pin 2:
Unused on MS43
MS45: Activation, heating for fuel tank leak diagnosis module

Pin 5:
Unused on MS43
MS45: Ground Secondary air, hot-film air mass meter (MAF for SAP)

Pin 10:
Unused on MS45
MS43: Signal Fuel pump relay 1

Pin 15:
Unused on MS43
MS45: Signal Secondary air, hot-film air mass meter (MAF for SAP)

Pin 18:
Unused on MS45
MS43: Signal Valve, exhaust flap M54 3.0 l only

Pin 19:
Unused on MS43
MS45: Activation E-box fan (fan to cool ECU compartment)

Pin 23:
Unused on MS45
MS43: Signal Clutch switch

Pin 25:
Unused on MS43
MS45: Signal EAC (Environmental Air Catalyst) sensor (SULEV/M56B25)

Pin 31:
Unused on MS43
MS45: Local CAN-bus low / Control unit for electronically controlled fuel pump (SULEV/M56B25)

Pin 35:
Unused on MS43
MS45: Local CAN-bus high / Control unit for electronically controlled fuel pump (SULEV/M56B25)

If I find any new info, or anything needs to be corrected, I will update the post accordingly.
I understand everything except the transmission/02 sensor harness.... Does this apply for a manual transmission?
I know MS45 use different 02 sensor plugs.

Sent from my SM-G930P using Tapatalk
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Old 11-26-2016, 05:32 PM   #3
VladBelsky
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Join Date: Mar 2014
Location: Buffalo, NY
Posts: 55
My Ride: '03 Franken325i/330i
Quote:
Originally Posted by Mflara20 View Post
I understand everything except the transmission/02 sensor harness.... Does this apply for a manual transmission?
I know MS45 use different 02 sensor plugs.

Sent from my SM-G930P using Tapatalk
Yes, you have to replace the transmission/02 sensor harness whether you have a manual or automatic transmission. The O2 sensor connectors are part of that harness.
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Old 11-26-2016, 07:01 PM   #4
mikeetastic
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Join Date: Nov 2012
Location: Cali
Posts: 1,062
My Ride: lots of 3
subbed..
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Old 11-26-2016, 09:18 PM   #5
Mflara20
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Join Date: Apr 2012
Location: Demorest Georgia
Posts: 1,119
My Ride: 04 330i
Quote:
Originally Posted by VladBelsky View Post
Yes, you have to replace the transmission/02 sensor harness whether you have a manual or automatic transmission. The O2 sensor connectors are part of that harness.
I have a wiring harness from a 330xi automatic. Would it work on my 6 speed?

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Old 11-26-2016, 10:31 PM   #6
VladBelsky
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Join Date: Mar 2014
Location: Buffalo, NY
Posts: 55
My Ride: '03 Franken325i/330i
Quote:
Originally Posted by Mflara20 View Post
I have a wiring harness from a 330xi automatic. Would it work on my 6 speed?

Sent from my SM-G930P using Tapatalk
I'm not sure. Never fiddled with an automatic harness. Here's a list of part numbers:

http://bmwfans.info/parts-catalog/E4..._trans_module/
__________________

2003 325i 5-speed
MS45.1 to MS43 converted
To be S52 swapped

Last edited by VladBelsky; 11-26-2016 at 10:33 PM.
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Old 12-02-2016, 10:20 PM   #7
mdrobnak
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Join Date: Apr 2008
Location: New York
Posts: 590
My Ride: 04 330i SMG TT STG1
There should also be a number of different pins on X60003 as well. I don't have them handy, but I do know that a decent amount of them move around.
That harness might be easier to just replace with a new one, but it is definitely able to be done.
__________________
-Matt

2004 330i with Technique Tuning Stage 1 Kit, UUC Twin Disc Clutch + FW Kit, Walbro 400 Fuel Pump, Aeromotive FPR, Modified Return Lines, E36 Fuel Filter, Ethanol Content Sensor, 550i Clutch Actuator, Lengthened actuator rod, modified exhaust, and FX-R projectors.
93 Octane - 8.5 PSI : 309RWHP on a Superflow / 3XXRWHP on a DynoJet
E85 - ? PSI : ???RWHP on a DynoJet
First SSG MoTeC M150 Powered 330
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Old 12-02-2016, 10:53 PM   #8
VladBelsky
Registered User
 
Join Date: Mar 2014
Location: Buffalo, NY
Posts: 55
My Ride: '03 Franken325i/330i
Quote:
Originally Posted by mdrobnak View Post
There should also be a number of different pins on X60003 as well. I don't have them handy, but I do know that a decent amount of them move around.
That harness might be easier to just replace with a new one, but it is definitely able to be done.
Both the transmission and DME harness should just be replaced with MS43-compatible ones.
__________________

2003 325i 5-speed
MS45.1 to MS43 converted
To be S52 swapped
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Old 01-04-2017, 01:58 PM   #9
TheFlyingJ
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Join Date: Jul 2015
Location: Braselton, GA
Posts: 25
My Ride: 2005 325i
VladBelsky, would you say it's easier to swap a MS45 to a MS43 this way or change the wire harness from a MS45 engine onto a MS43 engine? For clarity, I am doing an engine swap on a 325 MS45 and installing a M54B30 from a MS43... Any suggestions here or just do what you have listed above? I'd prefer to try and stick with the MS45 if possible. Thanks!
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Old 01-09-2017, 12:39 AM   #10
VladBelsky
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Join Date: Mar 2014
Location: Buffalo, NY
Posts: 55
My Ride: '03 Franken325i/330i
Quote:
Originally Posted by TheFlyingJ View Post
VladBelsky, would you say it's easier to swap a MS45 to a MS43 this way or change the wire harness from a MS45 engine onto a MS43 engine? For clarity, I am doing an engine swap on a 325 MS45 and installing a M54B30 from a MS43... Any suggestions here or just do what you have listed above? I'd prefer to try and stick with the MS45 if possible. Thanks!
It would be easier to swap the MS45 harness onto the engine that has an MS43 harness on it, if you're swapping the engine into a car with MS45, but by a small margin. Only extra work that there really is with converting the entire car to MS43 from MS45 is swapping the transmission/O2 sensor harness, along with MS43-compatible sensors.
__________________

2003 325i 5-speed
MS45.1 to MS43 converted
To be S52 swapped
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