[T6_measured] 01-Engine - Oil pressure switches & Oil level sensor
- Thread starter mmi
- Start date
Hi, I'm contemplating tackling the regulating valve when/if I can diagnose it as being faulty with the test @mmi mentions above.
Any chance you could send photos of the location of the valve, and the mount you had to move out the way?
Did you need to support the weight of the engine when you moved the mount?
You mention "after finding correct tools", what tools were required? anything out the ordinary?
Cheers
Bob
Hi Bob, its underneath near oil filter housing. Engine doesn't need supporting its the support for forward / back motion if that makes sense.
The "special" tool was a long thin t27 or t30, cant think which size it was, just buy a set of them, will make life easier to remove it. It holds sensor in place.
Your sensors will be fine, just change the reg valve, its an updated part so they clearly know.
Hello all from germany, same problem with my 2018 T6 euro6 110kw 166000km(103000miles) CXHA.
And I solved it with the help of this forum, many thanks to all.
I made all the measurement with VCDS, then after measuring the pressure with an analog gauge, I changed the solenoid valve and the high pressure sensor, but I think it was just the valve which didn`t work properly sometimes, mostly when the oil/engine was hot, then the valve remained in low pressure though triggert to go in high.
I tested it with my gauge on a test drive before and after to check the real oil pressure connected to the high pressure port nearby the oil filter. Before the valve change the oil pressure remained in the low pressure range of 2-2.7 bar even with high rpm in the error case, I hope that didn't damage the engine (turbo e.g.), after the repair it confirmed the VCDS measurements, see pressures listed below.
I got this measurings with VCDS after the change of the valve:
Here a warmup drive (partially):
and here the full throttle test, everything works now in a similar and I hope perfect way as mmi showed us:
The real oil pressures:
oil 0W30 14000 km (8700miles) old
cold oil:
2 bar rpm = 825
2,2 - 2,5 bar low pressure rpm < 2000
3,6 - 4 bar high pressure rmp > 2000
rpm > 3000 pressure not measured
hot oil (93 Celsius):
more or less the same pressures, just in idle modus (820 rpm) a lowered pressure (1,6 bar)
many thanks again to all that helped me to dive deeply into the problem, learning much to solve the problem with this more or less simple and not too expensive solution.
I got the new valve via ebay for about 40€, newest revision, vw wanted around 150€ + tax.
And I solved it with the help of this forum, many thanks to all.
I made all the measurement with VCDS, then after measuring the pressure with an analog gauge, I changed the solenoid valve and the high pressure sensor, but I think it was just the valve which didn`t work properly sometimes, mostly when the oil/engine was hot, then the valve remained in low pressure though triggert to go in high.
I tested it with my gauge on a test drive before and after to check the real oil pressure connected to the high pressure port nearby the oil filter. Before the valve change the oil pressure remained in the low pressure range of 2-2.7 bar even with high rpm in the error case, I hope that didn't damage the engine (turbo e.g.), after the repair it confirmed the VCDS measurements, see pressures listed below.
I got this measurings with VCDS after the change of the valve:
Here a warmup drive (partially):
and here the full throttle test, everything works now in a similar and I hope perfect way as mmi showed us:
The real oil pressures:
oil 0W30 14000 km (8700miles) old
cold oil:
2 bar rpm = 825
2,2 - 2,5 bar low pressure rpm < 2000
3,6 - 4 bar high pressure rmp > 2000
rpm > 3000 pressure not measured
hot oil (93 Celsius):
more or less the same pressures, just in idle modus (820 rpm) a lowered pressure (1,6 bar)
many thanks again to all that helped me to dive deeply into the problem, learning much to solve the problem with this more or less simple and not too expensive solution.
I got the new valve via ebay for about 40€, newest revision, vw wanted around 150€ + tax.
For future reference. Applicable to T6 EU6 engines.
Oil pressure switch - F1. Switch pressure 2.3 to 3.0 barOil 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, CXHA, CXGC, CXHB, and CXEB, CXECNote: different documents for engines built before/after August-2018.
T6 - 2.0 Diesel EU6 Engine Wiring Diagram
2L Diesel Engine With Start/Stop Circuit Diagram Covers Euro 6 engines CXFA/CXGA/CXGB/CXHA/CXHB Please check the history/updates tab, first release is for early T6s manufactured from June 2015, second release is for vehicles manufactured from...www.t6forum.com
T6 - 2.0 Diesel EU6 Engine Wiring Diagram
2L Diesel Engine With Start/Stop Circuit Diagram Covers Euro 6 engines CXEB/CXEC Please check the history/updates tab, first release is for early T6s manufactured from June 2015 with CXEB engine, second release is for vehicles manufactured from...
Oil pressure switch for reduced oil pressure - F378 (green)
At the rear of the cylinder head above the turbocharger. Use a
small hand mirror if necessary as it is difficult to reach.
View attachment 218860
Oil pressure switch - F1 (brown)
In the (base of) oil filter housing
Oil pressure regulating valve - N428
In the neighbourhood of oil filter
View attachment 218861
More details how to remove >here<
In the graphs the status of oil pressure switches (closed/open) is combined to show oil pressure states. Thus value 200 basically indicates oil pressure somewhere 0.3...2.3 bars, and respectively 400 indicates oil pressure above 2.3 bars. Also graphed is control signal of Oil pressure regulating valve (this far only values 0/100% observed).
Each dot in the graph represents a data point in the recording.
Picture 1.
View attachment 128055
Picture 1.1.
View attachment 128053
Picture 2.
View attachment 128056
Picture 3.
View attachment 128057
Picture 4.
View attachment 164969
EDIT: picture replaced to show more "bumps"
The bumps 1 and 2 by just flooring the pedal quickly. The third by gradually (slowly) increasing revs - note no change in green/orange.
IDE00021 Engine RPM
IDE00497-MAS00627 Status of oil pressure switches-Oil pressure switch for high pressure
IDE00497-MAS00628 Status of oil pressure switches-Oil pressure switch for low pressure
ENG130437 Oil pump PWM signal duty cycle
VCDS Basic Settings - IDE00494 - Test of changeover of oil pressure valve
T6 Engine controller has a dedicated test to verify operation of oil pressure regulator. The test runs engine for 10 seconds at 3000 RPM and commands oil pressure to "high" full time of high revs (unlike normally just for a short burst seen in picture 4).
Picture 5.
View attachment 197492
View attachment 197547
View attachment 197544
If the test fails I would expect to see something else than - routine OK? Please report back!
I’ve got the same fault code and I’ve just carried out the basic setting as described and it did indeed fail.For future reference. Applicable to T6 EU6 engines.
Oil pressure switch - F1. Switch pressure 2.3 to 3.0 barOil 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, CXHA, CXGC, CXHB, and CXEB, CXECNote: different documents for engines built before/after August-2018.T6 - 2.0 Diesel EU6 Engine Wiring Diagram
2L Diesel Engine With Start/Stop Circuit Diagram Covers Euro 6 engines CXFA/CXGA/CXGB/CXHA/CXHB Please check the history/updates tab, first release is for early T6s manufactured from June 2015, second release is for vehicles manufactured from...T6 - 2.0 Diesel EU6 Engine Wiring Diagram
2L Diesel Engine With Start/Stop Circuit Diagram Covers Euro 6 engines CXEB/CXEC Please check the history/updates tab, first release is for early T6s manufactured from June 2015 with CXEB engine, second release is for vehicles manufactured from...
Oil pressure switch for reduced oil pressure - F378 (green)
At the rear of the cylinder head above the turbocharger. Use a
small hand mirror if necessary as it is difficult to reach.
View attachment 218860
Oil pressure switch - F1 (brown)
In the (base of) oil filter housing
Oil pressure regulating valve - N428
In the neighbourhood of oil filter
View attachment 218861
More details how to remove >here<
In the graphs the status of oil pressure switches (closed/open) is combined to show oil pressure states. Thus value 200 basically indicates oil pressure somewhere 0.3...2.3 bars, and respectively 400 indicates oil pressure above 2.3 bars. Also graphed is control signal of Oil pressure regulating valve (this far only values 0/100% observed).
Each dot in the graph represents a data point in the recording.
Picture 1.
View attachment 128055
Picture 1.1.
View attachment 128053
Picture 2.
View attachment 128056
Picture 3.
View attachment 128057
Picture 4.
View attachment 164969
EDIT: picture replaced to show more "bumps"
The bumps 1 and 2 by just flooring the pedal quickly. The third by gradually (slowly) increasing revs - note no change in green/orange.
IDE00021 Engine RPM
IDE00497-MAS00627 Status of oil pressure switches-Oil pressure switch for high pressure
IDE00497-MAS00628 Status of oil pressure switches-Oil pressure switch for low pressure
ENG130437 Oil pump PWM signal duty cycle
VCDS Basic Settings - IDE00494 - Test of changeover of oil pressure valve
T6 Engine controller has a dedicated test to verify operation of oil pressure regulator. The test runs engine for 10 seconds at 3000 RPM and commands oil pressure to "high" full time of high revs (unlike normally just for a short burst seen in picture 4).
Picture 5.
View attachment 197492
View attachment 197547
View attachment 197544
If the test fails I would expect to see something else than - routine OK? Please report back!
A detailed example how to run and record the test (Basic Settings)
[T6_measured] 01-Engine - Built-in test for EGR
So it seems - inevitable P0401. Well, visited a VW garage to be tested - the van had accumulated 30 events in ECU's memory since July 2021 (since 20 months now). Eventually managed turn on the emission light at event number 31 - thus had a priviledge to have EGR flow tested. The result -...
- Attached a VCDS measurement setup file TEST_OIL_PRESSURE_REGULATOR.u01 - remove the .PDF extension so it will become a VCDS compatible .u01 file.
- Alternatively can also tick the parameters individually
Here’s a pic of the outcome. It did about 10 seconds at 3000rpm then gave this result and the flashing coil light came on.
I guess it’s time to replace the oil pressure valve.
Thank you very much for reporting! Really appreciated!
That sounds like it did full test? See below 30 - 40 seconds.
I did it whilst driving - 30 minutes just because it was my daily run. The idea was to capture normal behaviour for future reference. I think what can be seen in post#1 pictures 1-4 that the response is slighly different when oil is cold vs. hot.
Anyways, I think that measurement data when and why basic settings fail on your van would probably help better to conclude possible culprit (would expect be different than in the picture above).
I just realized I didn't describe too well how to set up measurements for basic settings (in post#1)
Before launching the "Test of changeover oil pressure valve" you can setup a recording by selecting "Show measuring data" (down left)
and selecting the following
IDE00021 Engine RPM
IDE00497-MAS00627 Status of oil pressure switches-Oil pressure switch for high pressure
IDE00497-MAS00628 Status of oil pressure switches-Oil pressure switch for low pressure
ENG130437 Oil pump PWM signal duty cycle
Click "Log" and
Click "Start"
Now launch the "Test of changeover oil pressure valve" ("Go")
-
-
-
Finally "Stop" the data logging
Please see more detailed description about steps setting up measurement when doing Basic Settings here - especially the "(2)"
[T6_measured] 01-Engine - Built-in test for EGR
So it seems - inevitable P0401. Well, visited a VW garage to be tested - the van had accumulated 30 events in ECU's memory since July 2021 (since 20 months now). Eventually managed turn on the emission light at event number 31 - thus had a priviledge to have EGR flow tested. The result -...
I'm more than happy to create the plots.
Can somebody briefly explain why the Transporter is equipped with solenoid activated oil pressure control valves?
IC engines have run high pressure and low pressure lube oil circuits for decades using spring loaded regulators without issues.
Introducing electrical actuation seems like a recipe for a major engine wreck in the event of a failure.
IC engines have run high pressure and low pressure lube oil circuits for decades using spring loaded regulators without issues.
Introducing electrical actuation seems like a recipe for a major engine wreck in the event of a failure.
Thanks. I’ll give that a go tomorrow if I get chance and post the results on here.That sounds like it did full test? See below 30 - 40 seconds.
View attachment 248964
I did it whilst driving - 30 minutes just because it was my daily run. The idea was to capture normal behaviour for future reference. I think what can be seen in post#1 pictures 1-4 that the response is slighly different when oil is cold vs. hot.
Anyways, I think that measurement data when and why basic settings fail on your van would probably help better to conclude possible culprit (would expect be different than in the picture above).
I just realized I didn't describe too well how to set up measurements for basic settings (in post#1)
Before launching the "Test of changeover oil pressure valve" you can setup a recording by selecting "Show measuring data" (down left)
View attachment 248965
and selecting the following
IDE00021 Engine RPMIDE00497-MAS00627 Status of oil pressure switches-Oil pressure switch for high pressureIDE00497-MAS00628 Status of oil pressure switches-Oil pressure switch for low pressureENG130437 Oil pump PWM signal duty cycle
Click "Log" and
Click "Start"
Now launch the "Test of changeover oil pressure valve" ("Go")
-
-
-
Finally "Stop" the data logging
Please see more detailed description about steps setting up measurement when doing Basic Settings here - especially the "(2)"
[T6_measured] 01-Engine - Built-in test for EGR
So it seems - inevitable P0401. Well, visited a VW garage to be tested - the van had accumulated 30 events in ECU's memory since July 2021 (since 20 months now). Eventually managed turn on the emission light at event number 31 - thus had a priviledge to have EGR flow tested. The result -...
I'm more than happy to create the plots.
I have the (really) old cable so it may not have the data frequency for a good graph. See how it goes.
Everything is all about getting as much mpg and as little emissions from engines. DPF's are causing a significant dip in mpg due to the regens, so they are trying to shave off fuel consumption by any other means possible. Using thin viscosity oil, and ECU pressure management is just one way of doing it. Unfortunately, this is making engines extremely complicated, and introducing more and more things that can go wrong.
Other unintended consequences has happened on other engines, eg the third generation 3.0 V6 TDI - This engine has been slightly shrunk relative to the 1st & 2nd generation, by adding an intermediate camshaft chainwheel / drive gear underneath the camshafts. The bearings are not pressure fed, but rely on oil flung to them from the cam chain, unfortunately, they don't get enough oil, and wear out. The 'fix' is to remap the engine oil pressure, so the pressure is jacked up particularly at lower RPM. But for most, the fix is engine out, new cam chains & gears etc and an oil pressure remap @ £££££++
george_holland
New Member
I'm in the coil light fault code 16056 spin cycle. Been around the houses now, high and low switches replaced twice, regulation valve , finally mechanics replaced the oil pump. There were fragments of aluminium in the strainer, took the old pump home and dismantled it, very worn surfaces, perhaps letting oil pass? Also small gouge on a port. Doesn't look healthy so glad to have replaced it. The wear looks like it should have a bearing at that point, rotating part wearing straight on the housing. Hope this is the fix! Thanks to VeeW services for the very quick turnaround for our holiday
Jwhit
Member
I had this. VW changed sensors and regulator twice. Then changed oil pump. But low and behold still coil light and start stop error. All oil pressures etc are fine after their tests. So still scratching my head. Drives perfect
Well I never got round to doing the data logging. Maybe I'll do it now.
Booked van into garage for full service as it was due. Told them about the coil light and fault and that it failed the oil pressure valve test.
They were determined it would be the switch, so replaced them both. Coil light still flashing so the valve needs doing.
Guess what? they cant fit me in until October for that job.
Why are all garages total mongs.
Anyway, I'm going to be doing it myself as soon as I can get hold of the part.
GRRRRRRRRRRRRRRRR
Booked van into garage for full service as it was due. Told them about the coil light and fault and that it failed the oil pressure valve test.
They were determined it would be the switch, so replaced them both. Coil light still flashing so the valve needs doing.
Guess what? they cant fit me in until October for that job.
Why are all garages total mongs.
Anyway, I'm going to be doing it myself as soon as I can get hold of the part.
GRRRRRRRRRRRRRRRR
What is part number for this or can you send me a link please
Just an update to the thread. Had the valve replaced yesterday by the garage. No coil light on the way home. Ran he VCDS test again and it completed OK this time. Hopefully that's the end of the problem.
Just to confirm - the VCDS test did say "failed" in August?
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