[T6_measured] 01-Engine - Oil pressure switches & Oil level sensor

[mmi]

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, CXHA, CXGC, CXHB, and CXEB, CXEC​

Note: 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...

www.t6forum.com

​

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Spoiler: Locations of oil pressure switches and oil pressure regulating valve

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.

Oil pressure switch - F1 (brown)​

In the (base of) oil filter housing

Oil pressure regulating valve - N428​

In the neighbourhood of oil filter

More details how to remove >here<

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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.

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Picture 1.​

Spoiler: Engine start by Stop/Start system

Picture 1.1.​

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Picture 2.​

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Picture 3.​

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Picture 4.​

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.

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Spoiler: Measurement setup

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

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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.​

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 -...

www.t6forum.com

• 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

 

[mmi]

Associated fault codes:

005706 - Oil Pressure Switch - P164A - 002 - Implausible Signal​

​

005707 - Oil Pressure Switch - P164B - 000 - Malfunction​

15188 - Oil Pressure Switch - P164B 00 [044] - Malfunction​

16056 - Oil Pressure Switch - P164B 00 [108] - Malfunction​

5580 - Oil Pressure Switch - P164B 00 [032] - Malfunction​

​

15191 - Oil Pressure Switch for reduced Oil Pressure - P164C 00 [032] - Implausible Signal​

​

16058 - Oil Pressure Switch for reduced Oil Pressure - P164D 00 [104] - Malfunction​

​

15211 - Oil Pressure Regulating Valve - P164E 00 [047] - Electrical Malfunction​

Spoiler: References to the faults on T6Forum

Oil pressure regulator valve

Big Wave Campers... window leaking, leisure-battery loose..

I wonder about those good reviews - either they are false or the new owners haven't found the male chicken-ups yet. Or they were written by Donald Trump! I know. They seem to be great or appalling. Nothing in between. Or I’m just very unlucky!

www.t6forum.com

Oil pressure regulator valve

P164b00 fault code oil pressure malfunction.. Glow plug flashing.. start stop not working.. limited revs

Hi.. New to here Have a 2.0tdi Crafter 2018 new shape DAU engine with a trouble code P164B00 I see a few T6 owners have had same fault code and never said the Fix...?? We've checked oil pressure.. all good X2 oil switches & change oil with correct grade & genuine parts.. Any help will be...

www.t6forum.com

glow plug warning light and stop start errors [Resolved]

been having intermittent warning light and stop start errors with limp mode for the last week, plugged into vcds today and got these faults 3 Faults Found: 16056 - Oil Pressure Switch P164B 00 [108] - Malfunction Intermittent - Confirmed - Tested Since Memory Clear...

www.t6forum.com

P164B 2.0 150

Currently have a van in and out of limp mode due to flashing coil light and this fault. I've changed both sensors for genuine parts, new oil and filter, both plugs are getting voltage 7v top and 9v bottom kinda stuck anyone else had this issue with the sensors?

www.t6forum.com

Fault Codes 25796 / 16056

I get this 2 fault codes. I know that 1st one is Start Stop as it is not working. The second one is a bit of unknown. T6 Multivan 2016 2.0 110kw Car Scanner ELM OBD2 DTC report Selected brand: Volkswagen VIN: WV2ZZZ7HZGH029471 ============1============== 25796 Raw code: 0064C4 ECU: 01...

www.t6forum.com

31130 fault code

Selective catalytic reduction Can I just ask why your paying is t the van in warranty ? The warranty ran out Feb 2020

www.t6forum.com

Oil Pressure Switch for reduced Oil Pressure

Oil pressure issues after top end rebuild

Morning, I’ve recently done a top end rebuild of a 2018 T6 2.0tdi with 104,500m after a cambelt snap. I’ve had all sorts of issues since doing the rebuild one of which was a misfire due to stuck injectors. This is now sorted. Now she’s up and running I’ve got an oil pressure fault at idle. So...

www.t6forum.com

Spoiler: References to the faults on other forums

005706 - Oil Pressure Switch - P164A - 002 - Implausible Signal

2010 Touareg TDI with odd DPF reading

We are working on a 2010 VW Touareg with multiple fault codes, one being a P242F DPF bank 1 restricted/clogged. We were going to attempt to perform a DPF regeneration. I went to advance measuring values to make sure the prerequisites were fulfilled and found the temperature prior to particle...

forums.ross-tech.com

005707 - Oil Pressure Switch - P164B - 000 - Malfunction

Turns out the fault was a poor connection.​

2.0 TSI CCZA Intermittent Oil Pressure Warning

Hi, first timer here from UK. Have a 2.0 TSI in a Skoda Octavia vRS with intermittent oil pressure warning. Red warning originally and now orange warnung limiting to 4,000 rpm with EPC light. Have changed both oil pressure senders, blue and brown; had sump. pick up pipe an d oil pump off -...

forums.ross-tech.com

005707 - Oil Pressure Switch - P164B - 000 - Malfunction

Hello team Ross Tech

I have problem with Passat model year 2011 engine 1.8 tsi when i drive and go in 4500rpm esc light come and engine not have more power I replace oil pressure switch and measure oil pressure and oil pressure is 2.5bar. Have anyone experience with this Saturday,22,December,2018,13:28:54:44995...

forums.ross-tech.com

15188 - Oil Pressure Switch - P164B 00 [044] - Malfunction

2015 Volkswagen Golf GTI - engine rpm max 3000rpm

I have problem with cutoff engine rpms to 3000. After short ride, gauges shows 'Engine max 3000rpm' and EPC light turn on After ignition off, and turn on again problem sometimes losts. This is Golf GTI 2.0 TSI engine Thursday,30,May,2019,16:29:22:02777 VCDS -- Windows Based VAG/VAS Emulator...

forums.ross-tech.com

5580 - Oil Pressure Switch - P164B 00 [032] - Malfunction

Disable MVB 08

hello Victor Here. I got yesterday a kind of glitch in the application. it didn't allow me to go into the mvb in most of the modules that I clicked on... this is the pic. Then I updated it this morning to ver 18.x and it is back on. my question is since this is a different car. is it vcds...

forums.ross-tech.com

Analysis of fault codes - to be continued...

​

Background​

• The fault codes do not identify specifically either low- or high-pressure sensor.
• Working hypothesis is that implausible signal (P164A) possibly points to regulating valve - the switches have only states open/closed. Thus implausible would possibly mean oil pressure switch status is not responding to commands of oil pressure regulating valve... (see switch (oil pressure) responses to oil pressure regulating valve in the graphs above, especially the full throtte case). TBC...

Contributions more than welcome...

 

[mmi]

Oil level sensor:

T6 engine oil level and warning threshold data during a 30 minute run.

Samples taken at 1 minute intervals. Two first and two last samples were recorded engine off.

This engine reports oil level of 100 mm when filled to the "top" (e.g. immediately after oil change).

Spoiler: Sensor readings in cold

Monday,28,January,2019,08:13:57
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 7 x64
VCDS Version: 18.9.0.2 (x64) HEX-V2 CB: 0.4451.4
Data version: 20180927 DS296.0
www.Ross-Tech.com
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Address 01: Engine (04L 906 056 KN)

08:14:33
IDE00021 Engine speed 976 /min
IDE00025 Coolant temperature 25 °C
IDE00151 Oil fill level 18 mm
IDE00196 Engine oil temperature -17.4 °C
IDE00556 Outside air temperature -26 °C

IDE03133 Heat circuit 1 for reduc. agent meter. system: act. curr. 6.388 A
IDE03134 Heat circuit 2 for reduc. agent meter. system: act. curr. 2.215 A
IDE03135 Sensor for reducing agent tank temperature: temperature -12.5 °C
IDE07733 Ambient air pressure sensor 1 bank 1: raw value 0.993 bar
IDE10032 Reducing agent quality sensor: urea concentration 0.00 %
IDE10039 Reducing agent quality sensor: validity invalid
IDE10249 Reducing agent fill level sensor: act. value 0 mm

--------------------------------------------------------------------------------

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T6 engine oil level sensor "heartbeat"

 

[Dellmassive]

Nice data set.

 

[SamD]

Mine is currently doing this! Its going into the garage on Friday, hopefully they can sort it

 

[SamD]

Well i replaced the sensor and it hasnt made a difference.

 

[mmi]

Well i replaced the sensor and it hasnt made a difference.

I'm afraid I have missed something - what sensor and a difference in what? Any fault codes?

 

[SamD]

I'm afraid I have missed something - what sensor and a difference in what? Any fault codes?

Based on the additional posts about about the fault, i replaced the oil pressure switch which appears to have fixed other peoples vans. On mine i still get flashing coil light and stop start error until i reset the van.

 

[mmi]

Based on the additional posts about about the fault, i replaced the oil pressure switch which appears to have fixed other peoples vans. On mine i still get flashing coil light and stop start error until i reset the van.

Sounds like at least two different/independent issues. Definitely need to get the fault codes.

 

[SamD]

Sounds like at least two different/independent issues. Definitely need to get the fault codes.

I did have it, it was one of the malfunction ones. Will dig it out and post it on here.

 

[SamD]

so this is the error code:

1 Fault Found:
16056 - Oil Pressure Switch
P164B 00 [100] - Malfunction
Intermittent - Not Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 1
Mileage: 219314 km
Date: 2056.01.04
Time: 09:58:55

Engine RPM: 2513.75 /min
Normed load value: 60.8 %
Vehicle speed: 34 km/h
Coolant temperature: 69 °C
Intake air temperature: 20 °C
Ambient air pressure: 1000 mbar
Voltage terminal 30: 14.382 V
Unlearning counter according OBD: 40
Air mass at air mass meter 1: 288.0 kg/h
Standardized air flow ratio: 1.213 counts
Exhaust recirc.valve 1 bank 1: posit.feedback - Actual value: -45.98 %
Throttl.valve adapt. 1 bank 1: posit feedback - Actual value: 30.33 %
Charge air pressure: specified value: 2.174 bar
Absolute intake pressure: 235 kPa abs
Mean injection quantity: 36 mg/stroke
Index of current engine mode: 0
Index of next requested engine mode: 0
Index of engine target mode: 0

 

[mmi]

i replaced the oil pressure switch which appears to have fixed other peoples

Which one was replaced - low or high pressure switch?

Could you please make a similar VCDS recording of switch statuses as in 1st post? How-to below.

Spoiler: How-to

IGNition ON
Turn Stop/Start OFF

VCDS > Select 01-Engine > Adv. Meas. Values​

Tick "Group UDS requests" - by 7 (if available)​

Tick 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​

Log - Start​

​

Start the engine,

(1) let it run on tick over for 30 seconds,​

(2) drive around for 5-10 minutes​

(3) let it run on tick over for 30 seconds​

(4) floor the pedal for 5 seconds, pause for 10 seconds, floor the pedal again for 5 seconds, pause for 10 seconds​

(5) Stop the VCDS logging, Done, etc. Exit VCDS​

(6) turn OFF the engine​

Please post the logfile - LOG-01-....CSV from folder C:\Ross-Tech\VCDS\Logs

 

[SamD]

Which one was replaced - low or high pressure switch?

Could you please make a similar VCDS recording of switch statuses as in 1st post? How-to below.

Spoiler: How-to

IGNition ON
Turn Stop/Start OFF

VCDS > Select 01-Engine > Adv. Meas. Values​

Tick "Group UDS requests" - by 7 (if available)​

Tick 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​

Log - Start​

​

Start the engine,

(1) let it run on tick over for 30 seconds,​

(2) drive around for 5-10 minutes​

(3) let it run on tick over for 30 seconds​

(4) floor the pedal for 5 seconds, pause for 10 seconds, floor the pedal again for 5 seconds, pause for 10 seconds​

(5) Stop the VCDS logging, Done, etc. Exit VCDS​

(6) turn OFF the engine​

Please post the logfile - LOG-01-....CSV from folder C:\Ross-Tech\VCDS\Logs

i will go do this in a bit, on point 4 am i doing that stationairy or whilst moving?

 

[mmi]

i will go do this in a bit, on point 4 am i doing that stationairy or whilst moving?

Stationary - then the engine revs just steady 2500 RPM, which should give only a short burst of higher oil pressure (based on the oil pressure switches).

 

[SamD]

@mmi I have been out and done the logs, not sure which pressure switch was replaced tbh as the invoice doesnt state it.

 

[mmi]

@mmi I have been out and done the logs, not sure which pressure switch was replaced tbh as the invoice doesnt state it.

Thank you very much!

Full journey plotted.​

Blue line =engine revs - just to give an idea how the driving is going on.

Green line = command signal - I believe- to oil pressure regulating valve

Spoiler: Relationship between oil pressure regulating valve and oil pressure

In principle the command signal (green) regulates oil pressure - which can be seen immediately in status of high pressure oil switch (orange). See picture below.

However, this seems to be true only when engine warming up. On hot engine there seems to be no response during "normal driving" - see picture 3 (my post #1).

Orange line = oil pressure - based on the oil pressure switches - thus only three levels

0= no oil pressure​

200 = low oil pressure switch activated > 0.3 bar​

400 = high oil pressure switch activated > 2.3 bar​

Observations from the data:

Low pressure switch performs 100% as expected - when engine is running it's "closed" (=value 200 in the plot)​

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From 0 - 400 seconds: High pressure switch "closed" (value 400 in orange in the plot) every now and then. 100% response to green "command" signal. The same as in picture 2 (my post #1). Assuming to be normal.​

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From 400 to 700 seconds high pressure switch is "open" - no high pressure "bursts" at all in spite of command/green line dropping to zero. The same as picture 3 (my post #1). Assuming to be normal.​

Spoiler: First 400 seconds zoomed in

Engine startup​

Looks the same as picture 1 (my post #1). A couple of seconds of commanded high oil pressure. Assuming to be normal.

Revving engine at standstill.​

I would have expected to see here bursts of "high" oil pressure - when quickly flooring the pedal - as response to "green" signal dropping momentarily to zero.
Please compare with picture 4 (my post #1, now edited to show more data).

Conclusions -​

Low oil pressure switch works 100% as expected.

Mainly based on the plot "Revving engine at standstill" - when hot - either high oil pressure switch doesn't respond correctly OR oil pressure regulating valve doesn't respond correctly to command signal.

Interestingly in last high oil pressure burst at 385 seconds there was quite a delay (between green and orange) - compared with the earlier ones.

 

[SamD]

I might do another test on this once I've been driving around for a lot longer as it doesnt seem to be an issue once its properly warmed up.

Thanks for the additional details though @mmi I wonder if i replace the high pressure switch and then the valve. Where would i find part numbers to order this?

Cheers Sam

 

[mmi]

Where would i find part numbers to order this?

Post #1

 

[SamD]

Post #1

Oh yeah! Thanks as always!!

 

[SamD]

Post #1

I've searched for 04l906455j and its pulling back results for 04L906455A, would this be ok?