A6 C7 Error Code: 5211 (P008700) & 5060

Hello. We are experiencing the following problem with an unmodified A6:
Here's a brief background. The A6 was running relatively well without load. However, when accelerating to full throttle, the "fuel system pressure too low" error immediately appeared. The fuel filter was replaced, but the error persisted. The fuel injector flow rates were checked, and it was found that the second cylinder was exceeding 2.0 mg/stroke. The injector for the second cylinder was replaced, and the copper sealing ring was also burned out. The injector was reprogrammed in the engine control unit (ECU), the error code was cleared, and the fuel system was bled. During a test drive of 15 km, there were no problems, but then the "voltage supply" error appeared. It couldn't be cleared in this state, and the engine was barely running, feeling like it was only running on three cylinders. It stalls when accelerating. The colder it gets, the better it seems to run. When the temperature is below 30 degrees Celsius, there are no problems, and the fuel system error can be cleared. The engine runs perfectly fine in those conditions. What could be the cause?
Sorry for posting the Gutmann photos here; I unfortunately didn't bring the VCDS with me to the office.
Thank you.

Hi,

It's a shame that the error codes aren't VAG error codes...
Autoscan would be helpful.

If the fuel pressure is too low, either there is a fuel leak somewhere, the high-pressure pump is not building up enough pressure, or the pressure regulating valve is defective.

A log showing the desired vs. actual fuel pressure, using KDataScope, would also be helpful.

"Have the return flow rates of all injectors been measured and compared? Are these values close to the specified values?"

Best regards, Rainer.

Good morning, Rainer. Thank you very much for your reply.
Ich werde heute gegen Mittag mal Autoscan machen und Logs fahren. Ich habe dazu nur ein kurzes Zeitfenster verfügbar, wo ich dann mal Kraftstoffdruck-Soll/Ist loggen werde. Bei ca. 70°C steigt der Motor im wahrsten Sinne des Wortes aus und ich muss abschleppen da nicht mehr fahrbar. Also komplett digital und temperaturabhängig. Kann somit irgendwie nicht Hardware sein?! BiLater.
VG
Mike.

Quote:

Around 70°C, the motor literally shuts down, and I have to have it towed because it's no longer drivable. So it's completely digital and temperature-dependent. Therefore, it can't really be hardware, can it?

With "normal" injector nozzle combinations, customers have already experienced similar effects: the nozzles overheated due to improper installation (combustion gases passing through the valve seat into the cylinder head) and became clogged internally. However, you didn't mention that all the injectors were modified on your engine.
Even diesel fuel becomes less viscous as the temperature increases, and a pressure regulating valve that doesn't seal properly could then be overloaded.

Best regards, Rainer.

Only the injector for cylinder 2 was replaced, and the copper sealing ring was also burned out. The injector in the MSG (fuel supply module) was reprogrammed, the fault code was cleared, and the system was bled.

Quote:

The copper sealing ring had also burned away.

Why? Then it couldn't have been properly secured...

Quote:

Kann somit irgendwie nicht Hardware sein?!

Es ist mit Sicherheit Hardware. Der Code P0087 zeigt in die Richtung, sh. Ross Tech Wiki.
But first, let's do a full scan so we can have the error codes in the VCDS format.
hg
Herbert.

This error always occurs when the engine is under full load, even when the engine is still cold. After that, it essentially goes into a limp mode. If the error is cleared, the engine returns to full power until the next time it restarts.

Saturday, January 27, 2018, 11:06:30:06515
VCDS version: DRV 17.8.1 is running on Windows 7 x86.
shop.dieselschrauber.org

Address 01: Engine Control Module
Label file: DRV\059-907-401-V2.clb
Control unit part number: 4G0 907 401 F. Hardware: 4G0 907 401.
Component and/or version: 3.0 TDI EDC17 H37 0005.
Encoding: 12254012057601020000
Operating number: WSC 28061 142 88759
ASAM Dataset: EV_ECM30TDI0114G0907401F 001005 (AU57)
ROD: EV_ECM30TDI0114G0907401F.rod
VCID: 26443F5B59FE7E76CB-8072
"One error found:"

5060 - Supply injection valve(s).
P2146 00 [096] - Interruption.
Sporadic - unconfirmed - checked since last deletion.
Environmental conditions:
Error status: 00000001
Error priority: 2
Error frequency: 1.
Mileage: 258,145 km
Date: 2018.01.26
Time: 11:30:29

Motor speed: 2295.50 rpm.
Normalized load value: 16.9 %
Vehicle speed: 0 km/h
Coolant temperature: 79 °C
Intake air temperature: 20 °C
Atmospheric pressure: 960 millibars.
Voltage at terminal 30: 14.380 V.
Lost learning counter via OBD: 40.
Allowed number of injections - Bit 0: 3.
Fuel injection release status bit 0: 56
Desired injection profile bit 0: 56.
Medium injection amount: 4.99 mg/stroke.
Rail pressure regulation: Status bit 0: 5.
Fuel pressure: Actual value: 615000 hPa.
Control unit temperature: 34.6 °C


Readiness: 0 0 0 0 1

I have attached the Autoscan and log files as CSV files.

Hi,

Quote:

5060 - Supply injection valve(s) A

Okay, but that has absolutely nothing to do with the fuel rail pressure; it concerns the wiring between the engine control unit and the injector.

If the rail pressure issue is now resolved, I would focus on the error mentioned above and check the wiring and connectors.

Unfortunately, I had to delete your log file because it was completely corrupted due to conversions/saving in the wrong format.

Tip: As a customer, you can use KDataScope (available for download in your customer account on the Dieselschrauber Shop website). You don't have to perform any complicated conversions that would lead to such poor results. Just double-click the file and view it – that's all there is to it.
/viewtopic.php?t=16947&start=24#232335

Do you still have the log file somewhere, in its original, unedited form, as VCDS saved it?

Best regards, Rainer.

Thanks for your tip, Rainer. The wiring and connectors seem to be okay, maybe it's the motor control unit (ECU)?

Perhaps you can find a use for this setup. It requires very little material, and we were able to reproduce the error five times in almost 5 minutes.

Hi Mike,

The file was junk again, and furthermore, it wasn't a .csv file, but an Excel file.

Again: Take the VCDS log file (.csv). Don't do anything with it, just take it; it's not that difficult, really.

Best regards, Rainer.

Has this fuel injector problem only started since you installed a new injector? Is the injector the correct type for your vehicle?
"I once encountered a similar issue with an A5, and in that case, the engine control unit (ECU) was defective. However, in that particular instance, the car wouldn't even start."