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      06-06-2023, 11:02 PM   #1
tech10
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2011 bmw 28ix issue - engine crank but no start.

I need help to fix the issue I have with 2011 bmw x3 28ix(n52).

The symptom is engine crank but no start.

Code from ISTA:
1B5102 Terminal 15_3, line from CAS, electrical Short circuit to earth
1C5104 Terminal 15N<03: No voltage
1C5104 BSD, message; oil condition sensor: Missing


so I took out the Integrated Supply Module and sperate it to replace box.
oh no... BMW sodered the fuse to the board so that no one can replace it.


I managed to replace the fuse and the car start right away. I thought it is easy fix and called it a day but no.
I locked the door and left for a while. I tried to start it again, I won't start.
The issue came back again.
I pull the code and yes, it's same code. I opened box again and check the fuse, it's blown.

I checked the wire diagram and all lines are connected to DME.

I checked all wires from the fuse box(Integrated Supply Module) to DME and it is all good. No short circuits.

I called a couple of guys to get some advises and they said it may be DME itself. I was rushing to replace DME with used one(programed as well) because I need a car asap.
Replacing DME does not help. I still have same issue.

I'm looking at either Valvetronic Motor or water pump.
The reason is that there is very heavy load that blow the #3 fuse(15 amp) when the car wakes up.

also, the box is control of the power of ignition, fuel injection, and Valvetronic motor according to the document from BMW.


I need your help to resolve the issue.


Please let me know your idea or solution may help me to resolve it.

thank you for reading.
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Last edited by tech10; 08-20-2023 at 07:28 PM..
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      09-01-2023, 05:35 AM   #2
REBELS10
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Valvetronic

I am having the exact same issue, so when you find out the solution, please let me know. Or when I find out the solution, I will forward it on.
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      09-02-2023, 05:09 PM   #3
tech10
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Hi,

I do not have any solution. When I replaced the valvetronic motor, it seems that it did not come back as frequent as it did before. I managed to find way to drive it. If I drive it no more than 15 minutes or up until the engine reach to the operating temperature, it seems o.k.
I was wondering that it may be the water pump.
I just got a new car because I didn’t want to spend more money to it.
I am still curious what is the fix so please keep me posted.

Ryan
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