NefMoto

I picked up a spare ecu (removed from a 2001 audi a6 2.8 quattro with tip, my car is a 2000 a6 quattro 2.7 with m6) today, installed it, and flashed it with the same tune that I have on my ecu. The flash logs show 0 errors, it flashed in roughly the same amount of time, but when I started the car it immediately ran rough. CEL came on with the following codes.

Control Module Part Number: 8D0 907 551 M

  Component and/or Version: 2.7l V6/5VT     G   0002

           Software Coding: 06611

            Work Shop Code: WSC 87119

8 Faults Found:

18010 - Power Supply Terminal 30: Voltage too Low

        P1602 - 35-10 - - - Intermittent

18058 - Powertrain Data Bus: Missing Message from Instrument Cluster

        P1650 - 35-00 - -

16514 - Oxygen (Lambda) Sensor B1 S1: Malfunction in Circuit

        P0130 - 35-00 - -

16534 - Oxygen (Lambda) Sensor B2 S1: Malfunction in Circuit

        P0150 - 35-00 - -

16684 - Random/Multiple Cylinder Misfire Detected

        P0300 - 35-00 - -

16685 - Cylinder 1 Misfire Detected

        P0301 - 35-00 - -

16687 - Cylinder 3 Misfire Detected

        P0303 - 35-00 - -

16686 - Cylinder 2 Misfire Detected

        P0302 - 35-00 - -

I cleared them, but they came back. Funny thing is, with my original ecu and the same tune I have 0 codes and a smooth idle. With this ecu I have a shaky idle, and an obvious misfire, not to mention the oxygen sensor codes. If there was an issue with the memory layout, I assume I'd get an error before it even started writing (the size being written wouldn't match the sector size-correct?) I even re-wrote the same tune, and got the same results. What gives? The logs show nothing but successful reads and writes.

Anyone had an issue like this?

Could this have anything to do with the fact that the 2.8 uses 3 coils and a wasted spark design, whereas the 2.7 uses COP? I figured the flash would overwrite this. And why the 02 sensor codes? I could see if they were bad, but the original ecu shows no signs of failure.

Normally this would lead me to conclude I have a bad connection, other than the fact that I di-electric greased everything, and the board and components inside the ecu look fine. Funny thing is, the ecu had stored codes very similar from the previous car.

Sounds like the pin out is different...

I'm looking into that now. Most of the time (at least in my experience) that's the case the ecu has guides to prevent installing it in another application. It is an me7.1 ecu, and the boards are identical. I have also verified the memory layout to be the same (the eprom has 29f800bb printed on it). You can clear the codes, but they come back after a minute or so.

Then it probably means that the ECU hardware is different.

ECU hardware IS different for sure betweeen ME7.1 NA and turbo ME7.1.

Care to be more specific? Anyone have pinouts of a 2001 2.8 ecu? 3b0907551ab if that helps.

2.8 30v has wasted spark with 3 coils (IIRC), 2.7TT has 6 coilpacks. I am pretty sure that the ignition driver will be different between these 2 ECUs, therefore leading to the issues you're mentioning. It probably only runs on 3 cylinders with your 2.8 30v ECU, which also seems to be confirmed by your fault codes. Just get a spare 2.7 box and be done with it.

Fair enough. If you read my initial post, the wasted spark was indeed what concerned me. It does run on all 6 cylinders however, but the longer it runs, the more misfires it logs until it has faults for all 6 cylinders.

pretty sure the 30397 is used across the board. its just software and pinout differences.
ie: i used a 30397 from a 1.8t ecu in an s4 ecu and it worked fine.
though, i could be wrong.

Anyone have pinouts? I'm curious now....