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  #1  
Old 08-21-2021, 03:47 PM
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Codes on my 2009 X5 35D

I was hoping I could get some insight on some codes I'm seeing on my car.
I bought a X5 35D 2009 car as a project. It needed work and I have always wanted one. I have built 3 cummins projects and a Jetta TDi 6 speed manual that was tuned and deleted.
I deleted and tuned the X5 (no epa here), EGR/SCR delete, JR tuning 2.0 race tune, race throttle body, Buzzken downpipe with hi flow cat and exhaust, replaced the majority of the vacuum tubes, new charge air/boost piping seals as there was oil leaking and intercooler was gunked up on the passenger outside, new MAF sensor, new manifold pressure sensor. I am now getting the following codes on my Foxwell scanner.

3F01 DDE: Boost-pressure sensor, signal
3F35 DDE: charge air tube monitoring at idle
429A DDE: boost pressure control, low pressure stage control deviation
4987 DDE: Exhaust back pressure sensor before catalytic converter, signal

The tuning and delete on my TDi was so impressive i wanted to do an X5. i have a lift and do most of my own wrenching but admittedly have little training on a BMW diesel.

Does anyone have a schematic for the sensor wiring and routing and or seen these codes on a deleted tuned car?

I got the tuning and parts from AA Rodriguez who by the way is an excellent business to deal with.

Thank you!
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  #2  
Old 08-21-2021, 05:36 PM
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Most of those are vacuum line associated. Or the corresponding sensor for those vacuum lines. Did you check the function of your vacuum box (the thing over the valve cover where all the vacuum lines route). They do crack over time.

I'm trying to remember which sensors are called what as I had to remove all of those connectors when doing my transmission replacement.

You sure you capped or rerouted any necessary vacuum lines after the delete. The exhaust pressure sensor and the differential pressure sensors both get signals off of the DPF I believe. Without a DPF I assume they have provisions on the downpipe from AAR. Also I'm not sure if tuning is required for some of those codes, I have no experience with deletes.

I'd check your vacuum lines and sensor lines. Be careful of those exhaust sensor ones, I've read about a couple of instances where they slipped off their fittings and sent hot exhaust onto the wire harnesses causing all kinds of havoc. One instance it melted the engine harness and required full replacement.
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2005 X5 4.4i Build 04/05 Maintenance/Build Log
Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles)


2006 X5 4.8is Build 11/05 Maintenance/Build Log
Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles)

2010 X5 35d Build 02/10
Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles)
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Old 08-21-2021, 06:06 PM
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I just ordered a vacuum pump tester and I will recheck everything including the actuator. I'm sure its something I routed wrong. I just have to go through everything. The diagrams you sent were awesome and really saved me time on double checking the tubing routes!
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Old 08-21-2021, 08:49 PM
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Quote:
Originally Posted by Waykooljr View Post
I just ordered a vacuum pump tester and I will recheck everything including the actuator. I'm sure its something I routed wrong. I just have to go through everything. The diagrams you sent were awesome and really saved me time on double checking the tubing routes!
You're welcome, I saved those when I came across them a year or so ago. Again, wish I could give the author credit. I'm sure a google search would turn it up.

Yes, the only line that I couldn't find on those diagrams was a line coming off the bottom of the turbo. There are 2 lines (they are actually clipped/managed together next to the intake tube) in the front right side of the engine. 1 is on the diagram (blue line that splices to become a black line that coming off the lower turbo), the other is not. I forget what it goes to, but it's in the same general area and routes across the front top of the engine and over to under the intake manifold at the vacuum bar with all the nipples.

BTW, when I replaced my lines I did them one at a time... and still had a hard time when it came to doing all the ones going across the front of the engine because of the T's and splices BMW used. So I wouldn't be surprised if you either forgot a line or have one mis-routed. Go over it when you're fresh. Hope you find it.
__________________
2005 X5 4.4i Build 04/05 Maintenance/Build Log
Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles)


2006 X5 4.8is Build 11/05 Maintenance/Build Log
Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles)

2010 X5 35d Build 02/10
Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles)
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  #5  
Old 09-05-2021, 07:22 PM
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Well, I replaced all vacuum lines, MAF, & MAP sensor, both vacuum solenoids, vacuum reservoir, The vacuum pump is pulling 25" mercury, and I triple checked all tubing for proper routing. I keep getting the 3F01 DDE boost pressure sensor, signal code.
I figured since i had it apart I would change the solenoids and plenum as well as all vac tubing to make sure everything was new. The charge air seals for the intercooler boost piping was also replaced as i had oil leaking around the red hose.
I have built a custom Jetta TDi with Malone tune and three Cummins and did all the wrenching myself, but this is my first BMW, any ideas?
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  #6  
Old 09-05-2021, 08:48 PM
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Okay so I found another code, it was a 3F35 Charge-Air tube monitoring at idle. I found a rubber seal that got hung up when I replaced the seals. when the engine cools ill pull the inter cooler and reseat the charge air tube. My question is would the air leak there cause the previous code 3F01 Boost pressure sensor, signal?
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  #7  
Old 09-06-2021, 12:30 AM
ard ard is offline
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what does your tuner say?


Did the car have codes before you started the delete/tune thing? If so, it really complicates things.... as I guess you are seeing.
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Old 09-06-2021, 01:44 PM
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The only code I had, and it threw like the day before i did the delete was the 3F01 Boost Pressure sensor, signal.
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Old 09-06-2021, 02:36 PM
ard ard is offline
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Yeah, 'deleting your way out' of engine control problems is -often- a miserable path.....
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Old 09-06-2021, 03:04 PM
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ARD,
I appreciate you taking the time to read this, I've built several diesel projects. including a Jetta TDi beast. every time it improved the car or truck immensely. I am just trying to get a better understanding of the mechanics in the operation of this SUV and the cause of this code, which based on your responses thus far, you don't either. I appreciate you wanting to jump in and interject your opinions. But if you haven't got constructive or helpful suggestions why bother?
I did reset the charge air seal and the other code 3F35 disappeared.
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