Dreaded oil pressure switches
- Thread starter Dave1969
- Start date
Seems to come back when the temperature drops. I’ve had them both changed plus the wet belt in the oil pump. See how it goes over the winter now.
Is it when the temperature drops or after a certain interval? Mine started playing up originally in May when it was warm?
Mine is on the crafter, always been fine when it warm. Soon as temps dropped it flashed up.
Ok great..still looking for a definitive solution or cause then
Have you done the wet belt in the oil pump?
I haven't.. Only the pressure switches .. What's the thinking behind the wet belt?
Ok great in going to have the cambelt done soon anyway
@mmi I've had this same issue. I have replaced the low pressure switch twice so now it has returned again i was thinking of changing the oil and filter but before that wanted to check the pump/valve were ok. I've attached the log. Any chance you'd mind giving your thoughts on it?Also you could to test the renewed components using engine's built-in diagnostics? Or perhaps VW already did that? Were the replaced parts VW OEM?
View attachment 240900
Details here:
[T6_measured] 01-Engine - Oil pressure switches & Oil level sensor
For future reference. Applicable to T6 EU6 engines. Oil pressure switch - F1. Switch pressure 2.3 to 3.0 bar Oil pressure switch for reduced oil pressure - F378 (919-040) Oil pressure regulating valve N428 (906-030) References: Workshop Manual Transporter 2016- Engines: CXFA, CXGA, CXGB...www.t6forum.com
Based on the logs it seems it's either
a) the valve doesn't respond correctly = raise oil pressure, or
b) oil pressure (high) switch doesn't see elevated pressure
c) oil pump itself doesn't produce elevated oil pressure
Log of today - high oil pressure (green=400) was registered only on the 2nd revving/command (dark blue)
Possibly even slightly delayed response...
Log of December 6th - perfect response on all three revvings
Log of December 6th - looks good - oil pressure rises when commanded
Well, didn't happen at 40 seconds, perhaps because of decreasing revs
A snippet of a Log of November 17th - ok
PS. All the above were in the log file - obviously you had used always the same (default) file for storage. Thanks for those - interesting to see how the issue developed
Great stuff..but what is the actual conclusion..we all appear to share the same fault issues but with differing success levels re resolution. I've done switches, fault went away for 4 months. Oil regulating valve, no change whatsoever. Getting to a point where I'm not willing to keep throwing money at possible solutions with no guarantee 
from MMI..@mmi you’re a legend as always. Much appreciated
Based on the logs it seems it's either
a) the valve doesn't respond correctly = raise oil pressure, or
b) oil pressure (high) switch doesn't see elevated pressure
c) oil pump itself doesn't produce elevated oil pressure
Is it worth also capturing oil temperature, as that may also have an impact on opening and closing the high/low pressure switches?
It appears from the logs it was done with a cold engine, and dumping oil pressure as the revs increase. Is that correct?
It would be good if it was also possible to capture actual oil pressure as well but couldn't see that as soemthing available to capture?
Would be interesting to see what "VCDS Basic Settings - IDE00494 - Test of changeover of oil pressure valve" reports ==> [T6_measured] 01-Engine - Oil pressure switches & Oil level sensor@mmi you’re a legend as always. Much appreciated
For me I’m thinking or replacing the high pressure sensor then re assessing. I may then do an oil change and also use 0w/30. If problem returns change the regulator valve. Process of elimination starting with the cheapest optionGreat stuff..but what is the actual conclusion..we all appear to share the same fault issues but with differing success levels re resolution. I've done switches, fault went away for 4 months. Oil regulating valve, no change whatsoever. Getting to a point where I'm not willing to keep throwing money at possible solutions with no guarantee
Well, between the lines it implies to actually measure the oil pressure - traditional way to rule out any of the suggested components. Alternatively just throw in new parts.
By the way, as low pressure switch is always "closed" when engine is running - I would expect low oil pressure switch failing would raise alarm of low oil pressure on dash.
Yes did those... This process of elimination is very frustrating and expensive.. changing the pressure switches gets rid of the problem temporarily...so what's happening exactly during that period? Are the switches continually failing?For me I’m thinking or replacing the high pressure sensor then re assessing. I may then do an oil change and also use 0w/30. If problem returns change the regulator valve. Process of elimination starting with the cheapest option
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