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S80 '06-'16 / V70 & XC70 '07-'16 General Forum for the P3-platform S80 and 70-series models |
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Turbo Boost Pressure Solenoid 31293964Views : 998 Replies : 13Users Viewing This Thread : hal9000f |
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Jan 24th, 2024, 11:33 | #11 | ||||||
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Last Online: Feb 8th, 2024 09:50
Join Date: Oct 2012
Location: Nottinghamshire
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Thanks for your input Thassos.
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Annoyingly, I believe with this car, I'd have to buy a whole new turbo+vacuum actuator if a part turns out to be faulty. But fingers crossed the fault lies elswhere. To be fair, the car drives fine and seems to have enough power, so is very drivable. Also, she just passed the MOT so emission wise (all this could be EGR related too according VIDA) all seems well... Quote:
For polarity, I used a Youtube video of somebody showing a diagram of one, so hope that was a comparable item. I will see if I can confirm the polarity the way you suggest. Quote:
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Thanks for the link. I'll have a look. Quote:
Thanks for your pointers. |
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Jan 30th, 2024, 13:48 | #12 |
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Last Online: Feb 8th, 2024 09:50
Join Date: Oct 2012
Location: Nottinghamshire
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Right. Here's an update.
I acquired a vacuum pump to check for leaks some more on all hoses (already did smoke tests) and found non. I also checked for movement of the arm leading to the turbo when vacuum is applied to the hose. Clear and constant movement seen. I've compared the old "switch/gate/turbo boost solenoid/Governor' (whatever the thing is called) with the vacuum pump and noticed a clear difference. The 'new' one (=second hand) holds vacuum nicely and releases OK too when connected to 12V. The original one does build up a vacuum OK but doesn't hold it for long, so probably faulty. So, the above would imply it was a fault in the governor that possibly caused the fault codes to come up. The strange thing is (to me anyway) that the same fault codes come back with the 'new' one, as it should 'do its thing' properly. Apart from the multimeter tests (I'm useless at that and I do observe changing signals in VIDA, implying signals get to and from the governor OK) I've now checked, as far as I know, all possible causes. Because of the above, I decided to run the 'Adaption turbo system' in VIDA. It has done things to what it was set to before, and to what it is working to now. I've attached the before and after values if they mean something to anyone. What I noticed after running the adaptation is that the closed and 60% turbo position are now correct (it was sitting at ¬80% before, when commanded to be 60% (see post 7). Oddly, when running on the 'Control returns to the control module', it gives around 50%. According to VIDA this should be 80% at idle... Will keep an eye on it the next few days to see if it throws up the earlier underboost codes again... |
Feb 7th, 2024, 13:16 | #13 |
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Last Online: Feb 8th, 2024 09:50
Join Date: Oct 2012
Location: Nottinghamshire
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Have done 500+ miles since the above post and all seems well. Just checked with VIDA and there are no turbo related messages stored.
So in conclusion, the governor might have been part of the problem, but simply replacing it did not solve the issue. Running the turbo adaptation was needed to get rid of the ever reoccurring fault codes. Thanks to those that took the time to share their knowledge with me. Cheers! |
Apr 30th, 2024, 09:48 | #14 |
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Last Online: Today 13:32
Join Date: Feb 2007
Location: Zagreb
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No need to start another thread, this one is very useful and interesting, so ...
V70 D3, MY 2013, engine D5204T7 with single VNT turbo, 160 tmiles. The following DTC keeps reappearing, but the car drives fine, no noticeable problems. Maybe lacks a bit of power for a fraction of a second sometimes when accelerating hard. "ECM-P003A85 Turbocharger/Supercharger Boost Control a position exceeded learning limit..." I know what the P/N 31293964 (VNT) Governor is (Actuator turbo pressure, Boost pressure control valve and all other names...), and I know the location. But, where is the turbo position sensor located? It is mentioned in the description of the ECM-P003A85 DTC as one of the three possible sources: - The turbo position sensor does not show correct position. - Vacuum hose for turbo control has cracked or come loose. - The mechanism for angling the guide rails has jammed. Is the turbo position sensor a standalone sensor, or is it integrated into turbocharger? And what is "The mechanism for angling the guide rails"? Is it the VNT Governor or something else? Thanks all.
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