Can we diagnose my SMG2 woes

[Daft Punk]

'05 M3 SMG vert. ~82k mi.


Regarding the SMGII, it loses hydraulic pressure...I hear air being released when the pump primes.
INPA adaptations didn't couldn't fix it.


Here is the weird thing, after I did those things I listed below, it drove and shifted into gear perfectly fine and smooth without a hiccup as long as I kept clearing the error/cog code with a regular OBD2 reader while driving.


I've tried doing the easy stuff first:


Replaced:
smg pump accumulator
smg pump motor - new motor torque readings show !-82. Before the swap, it was !-something outrageous.
salmon relay
resistor mod in the bay - this normalized my INPA readings. The sensor was showing hot when it was cold.
CHF fluid partial change
Tranny/Diff. fluid change
Checked fuses
Voltage on everything seemed fine from INPA. Been kept on a battery maintainer so she's got juice.
I did cheat a little bit while installing the new pump motor by splicing it's wires into the original wires near the plug.


My theories:
1.Perhaps some bad wiring or sensors tripping a pressure release valve...if one exist. If not..
2. I have an air/pressure leak in the system? Is that possible?
3. It needs an some kind of ECU reflash? I'm not familiar or couldn't find the correct daten files for my model.


INPA is just telling I'm losing pressure.


Doesn't seem be losing hydraulic fluids. Maybe a tiny itty bitty weep of something from somewhere thats not even really noticeable and seems within perfectly normal range. Could just be sweat build up.

Also, my driving habits = 100% trac off manual S6 mode. Not aggressive, lift off to shift. Basically minimalizing the time the the smg pump has to work.

[eacmen]

You should not be hearing any air in a hydraulically operated system.

Did you perform the bleed procedure?

Is your pump relocated to the drug bin? If so the bleed needs to be performed with the pump horizontal.


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[Daft Punk]

Was never able to fully complete accumulator bleed/adaptations, before and after it was replaced. Clutch and Full adaptations went on fine. Fluid had metallic in it before..

Are there any common sites or causes for the air/pressure release relating to the system?

[eacmen]

Was never able to fully complete accumulator bleed/adaptations, before and after it was replaced. Clutch and Full adaptations went on fine. Fluid had metallic in it before..

Are there any common sites or causes for the air/pressure release relating to the system?

Just bad fitting or seals within the pump itself.

Spray some soapy water on the fittings see if bubbles emerge or put some uv dye in the ch11.


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[Daft Punk]

I've tried the soapy water and never got telling bubbles anywhere.

When I swapped out the accumulator, I did it from the top and only tightened it as much as possible because I couldn't fit my torque wrench in, and the pump unit would begin "flexing" up to a point, so I might have to find some way to hold the pump tight and try to tighten up the accumulator a bit more. System is is in original location btw.

[flemm2]

Does anyone know what the hydraulic pressure should be in the SMG?

[eacmen]

Does anyone know what the hydraulic pressure should be in the SMG?

Between 45 and 80 bar.


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