Oil Sensor Issue - B104129/B104135 - New Instrument Cluster?

[mmi]

@mmi is there anything I can do in VCDS to get live reading from the oil level/temperature sensor to work out if it's working OK and it is the instrument cluster?

The oil level/temperature sensor connects into 17-Instruments (not the engine directly ) but the oil level can be read only from engine. The oil temperature is available in controller 17-Instruments.

When oil temperature is missing from the dash - can you then make a blockmap of 01-Engine and 17-Instruments?

Could monitor/log the following, and visually monitoring dash to see if also engine loses oil level/temperature readings when dash loses them. Log would allow to see if there are any disruptions in data stream.

IDE00151 Oil fill level 90 mm​

IDE00152 Oil warning threshold 60 mm​

IDE00196 Engine oil temperature 64.9 °C​

IDE07233-MAS07414 Bit string for status of oil level-Oil level monitoring​

IDE07233-MAS07422 Bit string for status of oil level-Oil level display​

IDE07233-MAS07423 Bit string for status of oil level-Sensor faulty​

I'm assuming IDE00699 & IDE00700 are 0 because it's not in extended service mode?

I have observed only 0 on these engines. Possibly just a placeholder.

IDE06386 - IDE06390 are all showing -32767 mm, is that normal? This was taking with the ignition on, engine off, after a 10 minute drive.

The same - never noticed any change (18 hours of logs).

 

[TacticalBrick]

Just as an update, the issue seems to be getting worse and worse, which is a good thing I suppose as it should make it easier to diagnose! I'll hopefully be able to get the blockmap data next week when it goes off as it's incredibly simple to reproduce now.

From cold, just drive up the A1 for 15 minutes. When the oil gets up to temperature usually around 95-100c, it'll revert to "---" and then the MFD option just disappears. It's done this on the last 5 drives now with both B104129 and B104135 fault codes still being logged.

Additionally, I'm getting the flashing yellow light on every ignition now until I open and close the bonnet. After getting the engine up to temperature and leaving it for an hour, the oil is showing bang on half way. Also last night after filling up, the car complained loudly to be put in park until I'd opened and closed the bonnet again.

My driveway is on a slight decline from the road to the house. When measuring from cold on the driveway it's just above min. So I'm pretty sure the oil level itself is OK, although the errors all seem to be temperature faults, not level faults.

I spoke to the specialist again and something was obviously lost in translation to me. They've given me an estimate of a couple of hours to trace the wiring properly. A new instrument cluster would only be required if they confirmed that was indeed the cause. I think they only did a cursory check under the engine when doing the rest of the work.

 

[TacticalBrick]

Hey again @mmi. So I've borrowed VCDS and have a log! What I've noticed is that the oil temperature always seems perfectly fine. However, the oil fill level I noticed was constantly jumping up to 120mm. I started logging and went for a drive and then eventually it only reads 120mm and then the oil temperature disappears on the MFD, despite still being readable by VCDS. So it's as though the oil level reading being 120mm for too long is the problem.

Is it normal for "Status of oil pressure switches-Oil pressure switch for high pressure" to be open most of the time?

Does this log help suggest anything?

 

[mmi]

Thank you - very interesting

However, the oil fill level I noticed was constantly jumping up to 120mm. I started logging and went for a drive and then eventually it only reads 120mm and then the oil temperature disappears on the MFD,

Based on on my observations there indeed is a "heartbeat" signal on top of oil level - created either by the sensor itself or possibly by I7-Instruments. Below a log of mine for reference - 100 seconds logged in both.




A slight difference at the "heartbeat" rate - mine doing actually more often.

eventually it only reads 120mm and then the oil temperature disappears on the MFD, despite still being readable by VCDS.

I think the issue appears first for a short time at 550...560 seconds - oil temperature jumps suddenly to 89.9 °C and staying steady. Finally after 660 seconds not changing any more - steady 89.9 °C- thus not likely to be correct/accuratere anymore.

The VAG specialist replaced the sensor (& oil) and cleaned up the contacts.

Was the sensor original VW part - provided by VW dealer?

 

[mmi]

Is it normal for "Status of oil pressure switches-Oil pressure switch for high pressure" to be open most of the time?

Yes, normal. Some details below - especially pictures 2 and 3.

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

22 Aug 2021

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

...

• mmi
• 005706 005707 15188 oil pressure p164b 00 t6_measured
• Replies: 124
• Forum: Engine, Gearbox, Exhaust, Drivetrain

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[TacticalBrick]

Was the sensor original VW part - provided by VW dealer?

The invoice, VW specialist, lists: "Oil Level Sensor (04L907660B)", so it should be a genuine Hella Sensor as I believe they only buy from TPS.

Based on on my observations there indeed is a "heartbeat" signal on top of oil level

That's really useful to know thanks!

I think the issue appears first for a short time at 550...560 seconds - oil temperature jumps suddenly to 89.9 °C and staying steady. Finally after 660 seconds not changing any more - steady 89.9 °C- thus not likely to be correct/accuratere anymore.

I hadn't noticed that, thank you so much for looking at the data. I suspect either the connection is dodgy and the warmth from around the engine is causing something to expand and separate or similarly with a wire.

 

[mmi]

I hadn't noticed that, thank you so much for looking at the data. I suspect either the connection is dodgy and the warmth from around the engine is causing something to expand and separate or similarly with a wire.

How about unplugging the sensor connector - would there be any different fault codes?

 

[TacticalBrick]

I don't have any ramps unfortunately to be able to get to it and my driveway is on an incline so I'd be reluctant as a total novice to jack it up and fiddle around. It's booked in next week at the specialist, so I can at least go armed with some data to help them fix it thanks to your assistance !

 

[mmi]

How about unplugging the sensor connector - would there be any different fault codes?

Also what would the oil level and temperature be in VCDS when the connector is unplugged.