NefMoto

Hey everyone,

Just some TL;DR backstory: been flashing my A5 2.0 TFSI with PCMFlash trying out different tunes etc, and reached the OBD flash counter limit -> trying now to edit EEPROM so I can reset the counter.

As anyone else that's just as clueless about doing this, I prowled the forums for the how to and ended up buying myself the Scanmatik 2 Pro with the bench cable and module 53 for PCM Flash

ECU SW: 8K5907115
ECU HW: 8K2907115L
MODEL: MED17.1 (should be a TC1796)

My problem is that I have tried and continuously failed at reading this ECU on the bench i.e. no signs of making a connection in PCMFlash. My understanding is that with GPT I would not need to open the ECU.
Things I have tried (roughly in order)

- Normal 12V, GND, IGN, CAN L, CAN H - No PSU
- Normal 12V, GND, IGN, CAN L, CAN H - GPT pins (but originally wrong pins due to dodgy pinout schematic) - No PSU (GPT pins weren't powered it seems)
- Normal 12V, GND, IGN, CAN L, CAN H - GPT pins - No PSU
- Normal 12V, GND, IGN, CAN L, CAN H - GPT pins - PSU 12V 1.2A
- Normal 12V, GND, IGN, CAN L, CAN H - GPT pins - PSU 12V 1A
- Normal 12V, GND, IGN, CAN L, CAN H - GPT pins - PSU 12V 1.5A

NOTE: My car still starts after this - so ECU is not bricked

Where I'd like guidance is my next action from here so I can read this damned EEPROM
My thoughts are that it's one of the following:
A. PSU is not sufficient - I've been using normal Router, Device chargers that do 12V
B. My GPT Pinout is still wrong (I've also tried using the 5V GPT pins and the 12V bufferless GPT pins that come with the SM2-PRO bench cable)
C. GPT pins won't work first time and I need to open the ECU and get my soldering iron out
D. Unlikely - I somehow corrupted the EEPROM so that it's unable to be read (along with flash and micro)

Any help or experience would be appreciated

Cheers  :'(

53 is for booting not for bench.

the correct protocol would be 71 with page 9 of this manual https://pcmhelp.ru/data/pcmflash_71.pdf

Thanks aef - couldn't find any clear information on this from the resellers website for the module descriptions. Will give it a go

Btw there are a few ecu where benchmode is not working, one is VAG MED17.1 TC1796 UDS (with high TPROT). Anyway password reading should work and you can proceed in bootmode with module 53. If id and password reading is not working there is another problem with your tool setup.

Whats the usal number on MED17 VAG that is the limit? (I never got to an issue with EDC17 VAG - I went over 50-60 flashs....)

100, but because PCMFlash does a bypass flash every time instead of doing an unlock and then flashing cal, it increments the flash counter by 3-4 every time.
The reason for the flash counter is that the smaller sectors need a "flash refresh" after 100 flashes.
Flashing the calibration area only there is no such problem, thus after doing an unlock it's possible to disable the incrementing of the flash counter.

But of course that's extra effort and PCMFlash is always minimum effort, as you get what you pay for.

Yup, found out the hard way tonight that I've got one of the high TPROT ECUs - surprised since it's a 2012 ECU. Guess I'll have to crack it open and go bootmode.

Yup sadly the fact, sort of disappointed no one pointed this out on the majority of the posts where they recommend it as the cheapest way  :o
You live and learn I guess

orig version of MPPS is unlocking them "mustern" / "sample" the H hardware is converted in "X"
ECU is a "sample" version afterwards. But MPPS without clone, is still around 3000€/USD

At which point you're far better off paying someone to do all the fucking around for you. These newer ECUs aren't ME7.1 anymore, some people just think they can go and tinker and get good results but in more cases than not, they just don't.