MSD80 ecu

alex_k_145 · 01-14-2024, 12:09 AM

Hello,
I am trying to find someone who has some knowledge of the msd80 ecu. My issue is with the BSD communications on this ecu. I have the tools to solder and replace chips on the ECU however I'm trying to figure out what components /ic need to be replaced on the board of the ECU to restore BSDD communications. I would also be very grateful if someone could provide the board circuit diagrams/schematics for this ecu.

OMEGA412 · 01-15-2024, 12:22 AM

Do you have any other DME related issues? The BSD communication line failing with no other issues would be pretty uncommon. I was chasing BSD issues for whole month, turned out to be a loose wire in the water pump connector. BSD diagnosis procedure? Unplug your water pump, alternator, battery sensor and oil quality sensor, then plug one in and see if u still have a BSD error after clearing codes and waiting 1 minute. If not go to the next component. Which ever one cause the code needs replaced. Also check all the connectors at each of those components, the BSD wire is a purple one.

alex_k_145 · 01-15-2024, 12:57 PM

I did the same procedure and have no other DME faults. The only thing I didn't do was reset the code in the DME while I was testing each part. I will try this and see if resetting the code each time does anything. And my water pump and alternator were recently replaced so that might very well be the fault.

01-14-2024, 12:09 AM	#1
alex_k_145 New Member 2 Rep 12 Posts Drives: BMW e92 335i Monaco blue Join Date: Dec 2023 Location: Ontario iTrader: (0)	MSD80 ecu Hello, I am trying to find someone who has some knowledge of the msd80 ecu. My issue is with the BSD communications on this ecu. I have the tools to solder and replace chips on the ECU however I'm trying to figure out what components /ic need to be replaced on the board of the ECU to restore BSDD communications. I would also be very grateful if someone could provide the board circuit diagrams/schematics for this ecu.
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01-15-2024, 12:22 AM	#2
OMEGA412 Private 17 Rep 64 Posts Drives: BMW 335i Coupe Join Date: Sep 2023 Location: California iTrader: (0)	Do you have any other DME related issues? The BSD communication line failing with no other issues would be pretty uncommon. I was chasing BSD issues for whole month, turned out to be a loose wire in the water pump connector. BSD diagnosis procedure? Unplug your water pump, alternator, battery sensor and oil quality sensor, then plug one in and see if u still have a BSD error after clearing codes and waiting 1 minute. If not go to the next component. Which ever one cause the code needs replaced. Also check all the connectors at each of those components, the BSD wire is a purple one.
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01-15-2024, 12:57 PM	#3
alex_k_145 New Member 2 Rep 12 Posts Drives: BMW e92 335i Monaco blue Join Date: Dec 2023 Location: Ontario iTrader: (0)	I did the same procedure and have no other DME faults. The only thing I didn't do was reset the code in the DME while I was testing each part. I will try this and see if resetting the code each time does anything. And my water pump and alternator were recently replaced so that might very well be the fault.
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