Ad blue warning - can anyone give any pointers on the analysed data?

[mmi]

I wonder if I can observe the system dosing Adblue at the injector, without the injector connected to the exhaust system ? Or maybe it doesn't allow this. I expect it should spray the Adblue out. Wondering if I put the van on axle stands again, disconnect the injector from the exhaust and drop it in a tray and see if it spray Adblue out?

Anyone reckon this injector experiment will work?

Yes it should work - I think "IDE02636-SCR metering guantity test" is the test to run - under Engine > Basic Settings
Should be able to collect significant amount of AdBlue through the nozzle.
Possibly at the same could monitor and log the following:

Note: in there need to click on Start to actually record a log

IDE03139 Reducing agent injector: resistance
IDE03243 Reducing agent injector: current saturation phase
IDE07797-ENG49291 Injector 1 bank 1 for reducing agent before SCR cat: activation-Percent_16_usigned_100
IDE10241 Reducing agent pump module relative press.: calculated
IDE10248 Reducing agent supply pump: offset factor calculated
IDE10251 Reducing agent supply pump: measured resistance
IDE10918 Reducing agent: dosing qty. test calculated: actual volume
IDE10919 Reducing agent: dosing qty. test: calculated specified volume
IDE10921 Reducing agent delivery pump: number of strokes
IDE11219 Reducing agent inj. quantity: spec. value

 

[Gordon Bennett]

So pretty much a half full fuel tank at present...

Did you try adding more fuel? I filled over 2/3rds full as that's what the thread said to do. It literally worked straight away...

 

[Lucasimo]

Yes it should work - I think "IDE02636-SCR metering guantity test" is the test to run - under Engine > Basic Settings
Should be able to collect significant amount of AdBlue through the nozzle.
Possibly at the same could monitor and log the following:
View attachment 298159
Note: in there need to click on Start to actually record a log

IDE03139 Reducing agent injector: resistance
IDE03243 Reducing agent injector: current saturation phase
IDE07797-ENG49291 Injector 1 bank 1 for reducing agent before SCR cat: activation-Percent_16_usigned_100
IDE10241 Reducing agent pump module relative press.: calculated
IDE10248 Reducing agent supply pump: offset factor calculated
IDE10251 Reducing agent supply pump: measured resistance
IDE10918 Reducing agent: dosing qty. test calculated: actual volume
IDE10919 Reducing agent: dosing qty. test: calculated specified volume
IDE10921 Reducing agent delivery pump: number of strokes
IDE11219 Reducing agent inj. quantity: spec. v

Did you try adding more fuel? I filled over 2/3rds full as that's what the thread said to do. It literally worked straight away...

Yeah. It's filled up now. Went for 30 mile drive. Still with warning light on.

 

[Lucasimo]

Yes it should work - I think "IDE02636-SCR metering guantity test" is the test to run - under Engine > Basic Settings
Should be able to collect significant amount of AdBlue through the nozzle.
Possibly at the same could monitor and log the following:
View attachment 298159
Note: in there need to click on Start to actually record a log

IDE03139 Reducing agent injector: resistance
IDE03243 Reducing agent injector: current saturation phase
IDE07797-ENG49291 Injector 1 bank 1 for reducing agent before SCR cat: activation-Percent_16_usigned_100
IDE10241 Reducing agent pump module relative press.: calculated
IDE10248 Reducing agent supply pump: offset factor calculated
IDE10251 Reducing agent supply pump: measured resistance
IDE10918 Reducing agent: dosing qty. test calculated: actual volume
IDE10919 Reducing agent: dosing qty. test: calculated specified volume
IDE10921 Reducing agent delivery pump: number of strokes
IDE11219 Reducing agent inj. quantity: spec. value

Thanks ! I noticed that test so I'll have a look and remove the injector and give it a clean out if it's not spurting out any Adblue. From what I have seen on other videos, it has to come out as a spray rather than a drip.

 

[Gordon Bennett]

Yeah. It's filled up now. Went for 30 mile drive. Still with warning light on.

That's my theory blown out of the water then! It's a strange one as I'd had the same issue for over a week, then I read that thread, went out and filled up, took it for a drive and it reset within 10 minutes of driving. I hope you get it sorted....

 

[Lucasimo]

That's my theory blown out of the water then! It's a strange one as I'd had the same issue for over a week, then I read that thread, went out and filled up, took it for a drive and it reset within 10 minutes of driving. I hope you get it sorted....

I'm tenacious so I reckon I can solve this one. I really don't think it's an electrical issue (damaged wiring etc) since nothing is indicating that on the scans. If the dosing line is blocked then I could blow some compressed air through it as I have a big compressor to do that.

 

[Dundee_Kev]

Do you not have to bleed the adblue system? I'm pretty sure I have seen that function on some cars, but I could be talking nonsense right enough.

If your away to do a function test, then that should purge the air out and fill the adblue lines up

 

[Lucasimo]

Do you not have to bleed the adblue system? I'm pretty sure I have seen that function on some cars, but I could be talking nonsense right enough.

If your away to do a function test, then that should purge the air out and fill the adblue lines up

Yeah. I'm going to do that. Will first remove the injector and give it a really good clean in warm water with an old tooth brush. The VCDS tests should purge it as part of the test. It might just have a tiny blockage which might be enough to mess up the spray.

 

[mmi]

The system purges the AdBlue from the injector when ignition is turned off, and respectively fills up the system at the startup.

SSP 564 The 2.0 litre TDI engine in the T6 refers to the document below

 

[manfrotto]

Yeah. I'm going to do that. Will first remove the injector and give it a really good clean in warm water with an old tooth brush. The VCDS tests should purge it as part of the test. It might just have a tiny blockage which might be enough to mess up the spray.

Myabe test it before cleaning it, and then again after cleaning it, othewaise you won't necessarily know it that was the issue.

 

[Lucasimo]

Myabe test it before cleaning it, and then again after cleaning it, othewaise you won't necessarily know it that was the issue.

Good idea. I'll do that

 

[Lucasimo]

So I did a SCR metering test and it did spray a fine mist. Not a great deal as such was coming out of the end but it was sort of like a houseplant mister spray mist and it was pulsing like you would expect. Just not a great deal was coming out as such - a light mist.

Ran the engine with the injector out of the DPF hole and it didn't spray anything at all. Perhaps this is because something is noticing that its not in the DPF mounting position so it doesn't activate? I wonder if it should just dose Adblue anyway even when the injector is not in the mounting hole?

Here's the log file from the tests attached. I'm going to take the injector off and give it a good clean and then see what happens.

 

[Lucasimo]

I just did another SCR test and it shot one strong jet out and then went to pulses of a fine mist. I reckon there must be a problem with the injector....

 

[Lucasimo]

So I took the injector off, gave it a good clean, put back on and did another SCR metering test. Sprayed a fine mist again. Maybe this is how its meant to work during the test? The test said it passed OK as well so maybe I just carry on and hope that it resets the range to something sensible soon.

 

[mmi]

Here's the log file from the tests attached.

Thanks - unfortunately the file contains only one sample - not a continuos data stream.

The data logging should go along these lines

• Show measuring values
• Tick the data items
• Log
• Start (VERY IMPORTANT!)
• Select - IDE02636-SCR metering quantity test
• Go!

So I did a SCR metering test and it did spray a fine mist. Not a great deal as such was coming out of the end but it was sort of like a houseplant mister spray mist and it was pulsing like you would expect. Just not a great deal was coming out as such - a light mist.

I think it should be about 20-30 mk in 10 minutes.

Ran the engine with the injector out of the DPF hole and it didn't spray anything at all.

Sounds correct as in SCR catalyst (at the end of the DPF) need to be warm enough. Also engine idling doesn't produce NOx so no need to use AdBlue. Below a log of AdBlue usage (blue) - doesn't start before 200 seconds on the road.

 

[Lucasimo]

Thanks - unfortunately the file contains only one sample - not a continuos data stream.

The data logging should go along these lines

• Show measuring values
• Tick the data items
• Log
• Start (VERY IMPORTANT!)
• Select - IDE02636-SCR metering quantity test
• Go!

I think it should be about 20-30 mk in 10 minutes.


Sounds correct as in SCR catalyst (at the end of the DPF) need to be warm enough. Also engine idling doesn't produce NOx so no need to use AdBlue. Below a log of AdBlue usage (blue) - doesn't start before 200 seconds on the road.

View attachment 298171

Ah right! Forgot to do a proper log. I'll sort that now....

 

[Lucasimo]

Here we go - proper log file attached in CSV format. Took me a while to find where VCDS was saving them. The actual test only lasted for about a minute or so. It said it completed successfully.

 

[Lucasimo]

Clutching at straws here - but I'm actually wondering if the ECU itself needs a reset in some way? Or could it be that its not processing the signal correctly from the Adblue controller?

 

[Lucasimo]

Interesting to see that this fault appeared a few minutes after running the engine for a while and then doing a scan. It has come up before and I wonder where the issue is. Could it be that there's a blockage in the actual pipe coming from the pump itself and the injector - rather than the actual injector or pump being at fault? I really don't think the pump is at fault and the injector seems to be working OK. Maybe I can blast some compressed air through the supply pipe to clear it? Or run a mountain bike brake cable through it to clean it out?

Does anyone know how long the actual dosing line is?


Sunday,03,August,2025,13:12:08:16365
VCDS Version: Release 23.11.0 Running on Windows 10 x64
www.Ross-Tech.com

Address 01: Engine Labels: 04L-907-309-V2.clb
Control Module Part Number: 04L 906 056 KA HW: 04L 907 445
Component and/or Version: R4 2.0l TDI H02 6163
Software Coding: 00114014430501090000
Work Shop Code: WSC 02737 790 50316
ASAM Dataset: EV_ECM20TDI03004L906056KA 004012 (VN75)
ROD: EV_ECM20TDI03004L906056KA.rod
VCID: 76B5E6C56844C36A05F-8022
1 Fault Found:

31149 - Reductant Flow
P218F 00 [01100000] - No Flow Detected
Intermittent - Not Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Priority: 2
Fault Frequency: 1
Mileage: 272571 km
Date: 2096.01.10
Time: 11:58:42

Engine RPM: 823.50 /min
Normed load value: 35.7 %
Vehicle speed: 0 km/h
Coolant temperature: 30 °C
Intake air temperature: 29 °C
Ambient air pressure: 1010 mbar
Voltage terminal 30: 13.367 V
Unlearning counter according OBD: 40
Outside temperature sensor 1: B1: raw value: 23.5 °C
Reducing agent pump module relative press.: calculated: 777 mbar
Reducing agent fill level sensor: act. value: 88 mm
Sensor for reducing agent tank temperature: temperature: 21.5 °C
Reducing agent system pressurization release conditions-Engine running: Condition not met
Reducing agent system pressurization release conditions-Press. enabled: Condition not met
Reducing agent system pressurization release conditions-Heat. strategy: enable: Condition not met
Reducing agent system pressurization release conditions-Depressurized min. time below limit: Condition not met
Reducing agent system pressurization release conditions-Catalyst temp.reached: Condition not met
Reducing agent system pressurization release conditions-Release due to jammed valve needle: Condition not met
Reducing agent system pressurization release conditions-Rinse function finished: Condition not met
Reducing agent system pressurization release conditions-Initial filling completed: Condition not met
Reducing agent system pressurization release conditions-Release via inducement: Condition not met
Reducing agent system pressurization release conditions: 127


Readiness: N/A

 

[Lucasimo]

Took the Adblue dosing line off both ends and there's a fine nozzle in each end so impossible to physically clean the line. I'm going to wash the end connector pieces in a small jug of warm water at least and see what happens