2009 E93 ADE Single Turbo Build

doublespaces

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That 12v on the muffler flap should be constant. You just need that and a new ground - not the ground on the harness because that is the one the DME controls.

Both wires show 4.x volts. Grounding to chassis. Any idea why? I've seen the voltage fluctuating also like a PWM signal or something
 

doublespaces

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Measuring both pins:
IMG_20200705_143142.jpgIMG_20200705_143150.jpg
 

fmorelli

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We have an E93 in the family. I'm gonna take a look at it and see if we can sort this out.
Unfortunately we have an E93 335is in the stable now, too (one more car to maintain, currently getting a cooling system in my garage) ... let me know if I can help with anything.

Filippo
 
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NoQuarter

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Ok... I have same color code.

I am measuring what I expected to see. Battery voltage on the red/white when engine is running.

20200710_141618.jpg


I think you need to change your ground connection. Where you are clipped is a painted surface.
 
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doublespaces

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Ok... I have same color code.

I am measuring what I expected to see. Battery voltage on the red/white when engine is running.

View attachment 40521

I think you need to change your ground connection. Where you are clipped is a painted surface.

I've already tried direct to the battery and with the car on. I've had my tables tinkered with, would any of the cold start changes affect the voltage here?
 

NoQuarter

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The same fuse runs the ebox fan, muffler flap and fuel tank leak diag and is located in the ebox it looks like.

Maybe measure one of those to try and confirm correct voltage on that circuit?
 
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doublespaces

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The same fuse runs the ebox fan, muffler flap and fuel tank leak diag and is located in the ebox it looks like.

Maybe measure one of those to try and confirm correct voltage on that circuit?

Ahh, you may be right on the fuse.

1594409065003.png

1594409212195.png

So:
K6304a - Secondary Air Pump Relay
Y8616 - I don't know what this is(you said ebox fan?), but looking it up for other cars it says RPM sensor for transmission main shaft
IO1215 - Nitrogen oxide sensor (O2 Sensor)
M119a - Diagnostic Module for Tank Leaks (DMTL)
Y198 - Exhaust Gas-flap

I hate that you have torn into your car for all this. And now that we bring up the O2 sensor, Robert from Precision actually had mentioned this to me the other day, my O2 sensor codes(2CA7, 2CAB) I got may be related. I'll test it and let you know. I really appreciate the effort, I owe you one if this can solve the problem :)
 
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doublespaces

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Crisis averted!
00100lrPORTRAIT_00100_BURST20200710125242975_COVER.jpg
Good thing I called in the big guns to solve this case... Jokes aside, I did not expect there to be a fuse problem while voltage was showing, shows you what I know!

Also, a photo of my painted ground point holding up like a champ:
00100lrPORTRAIT_00100_BURST20200710125939573_COVER.jpg
 

doublespaces

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Woot! Good ending for this one!
Is a power signal strange in my case with a blown fuse? I'm trying to understand how power can be going there without it. So if you pulled your fuse, you'd get 4.x instead of 12/14?
 

NoQuarter

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Is a power signal strange in my case with a blown fuse? I'm trying to understand how power can be going there without it. So if you pulled your fuse, you'd get 4.x instead of 12/14?

It doesn't make much sense with the blown fuse. Perhaps something else is wrong with that circuit that caused the fuse to blow to begin with.

Maybe some corrosion into another circuit Supplying a bit of current/voltage?
 
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