Gearbox gone pop

[mattylondon]

There isn't any selective output tests, whether the TCU allows a sequential output test I've not looked.

When testing with VCDS measuring blocks to note are these:

MVB 5
Display zone 1: Solenoid valve 1 -N88
Reverse/first/second/third gear: off
Fourth/fifth/sixth gear: on

Display zone 2: Activation pressure regulating valve 1 -N215
(for clutch A)
Display range: 0 to ... mA

Display zone 3: Activation pressure regulating valve 2 -N216
(for clutch B)
Display range: 0 to ... mA

MVB6
Display zone 1: Activation pressure regulating valve 3 -N217
(for brake C)
Display range: 0 to ... mA

Display zone 2: Activation pressure regulating valve 4 -N218
(for brake D/clutch E)
Display range: 0 to ... mA

Display zone 3: Activation pressure regulating valve 5 -N233
(for ATF system pressure)
ATF: Gear oil
Display range: 0 to ... mA

Display zone 4: Activation pressure control valve 6 -N371
(for converter clutch)
Display range: 0 to ... mA

MVB 7
Display zone 3: Torque converter clutch status
Converter clutch open: TCC open
Converter clutch regulating/slipping: TCC control
Converter clutch closed: TCC closed


Fingers crossed for you mate.

[M-A8]

Adam, guys sorry for such a late update, had a truly nightmare way back with major road closure, traffic and being stuck on residential road for precisely 2h5min - 800yards with no escape whatsoever.
And Audi's TMC is just not worth a w*nk.
Rant over.

Back to the subject.
So there was only one code in the gearbox:


Address 02: Auto Trans Labels: 09L-927-760.lbl
Control Module Part Number: 4E0 910 156 F HW: 09L 927 156
Component and/or Version: AG6 09L 3.0lTDI RdW 0090
Software Coding: 0000001
Work Shop Code: WSC 02313 785 00200
VCID: 25411E01EC6EF869BA-8070
1 Fault Found:

17167 - Shift Monitoring
P0783 - 001 - 3-4 Shift
Freeze Frame:
Fault Status: 01100001
Fault Priority: 0
Fault Frequency: 6
Reset counter: 40
Mileage: 247064 km
Time Indication: 0
Date: 2017.02.08
Time: 12:37:05

Freeze Frame:
RPM: 2048 /min
RPM: 1728 /min
RPM: 1152 /min
(no units): 10.0
(no units): 71.0
Temperature: 62.0°C
T.B. Angle: 29.4°

Please also see attached full scan and measuring blocks video.
The only thing I have noticed there is that some of the pressure control valves have 0.050A reading where others 0.850A. They were taken while engine was running.

After clearing the only gearbox fault, as expected, there was still no drive at all, D or reverse, but also the fault did not come back. When selecting gears there was no weird noises or anything abnormal.

I will be sending all the attachments to Audi guys to clarify if these were the symptoms/faults/values with the knackered gearboxes they previously has to replace especially on 3.0TDi.

After a bit of googling, info on all websites is almost identical for the same symptoms of no drive:
- low/burned oil
- damaged wiring
- 3-4 shift solenoid failure
- TCM or PCM internal failure

If it's wiring, happy days.
Solenoid, happy days ish as there is no need to remove gearbox
I doubt it's oil, but if so then a fairly low cost, £350ish
TCM or PCM I don't know.

Full scan was done after clearing that only one fault on its own, running the engine, attempt to select the gear, ignition off and on.

[manca]

Thank you Marcin

[Turbo Tony]

My goodness, I'm late to this party and I apologise. I'm really sorry to hear of your troubles and hope there's a speedy and not wallet-busting end in sight.

Two things from me:

1) I'm fairly close to you, so let me know if there's anything I can do. I have VCDS (although I'm still learning how to use it)

2) If it is the mechatronic unit, it can be refurbished like mine was. Chester Transmissions did mine, but they're part of FATE, which has places dotted around the country. The nearest one I found to us is in Hertfordshire. I visited there after a suspected leak and they have ZF plaques all over the place and were really friendly. I think I posted their details before if you need them.

Best of luck.

[manca]

Thanks for the info Matt and the offer Tony. It seems the scans don't point directly to a smoking gun. Likely need is to trailer the car for further rummaging. Grateful to Marcin for his invaluable in involvement.

[mattylondon]

If it is a gearbox swap, I read somewhere recently that VAG Can Pro was used to read the flash from the original TCU and then this binary was reflashed to the new/used gearbox for it to work. So if there are software problems with used boxes in different cars there are solutions.

[manca]

That's useful info Matt thanks.

I've been pinning my hopes to something my dear old dad used to tell me about how time heals. Not sure how long I might be waiting but nothings happened in the first week....