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amppa
11-12-2006, 06:04 AM
I made a reset (Test 21) to my OBC IV by mistake. Now there is "pppp" on
display and only button that works is S/R. It flashes display.

What can I do? Do I have to buy a new code plug?

-amppa
vadim_braia
11-12-2006, 06:35 AM
You need just to start the engine :)
amppa
11-12-2006, 07:04 AM
You need just to start the engine :)

What, why? Well, I tried. It didn't help.
amppa
11-13-2006, 06:00 AM
I read coding plug and the result is:

00'55'00'00'78'98'3B'5D'14'10'AD'7B'E4'D0'FF'FF'
D2'CB'01'00'FF'FF'FF'FF'FF'FF'FF'FF'FF'FF'FF'FF'
FF'FF'FF'FF'FF'FF'FF'FF'FF'FF'FF'FF'FF'FF'FF'FF'
FF'FF'FF'FF'FF'FF'FF'FF'FF'FF'FF'FF'FF'FF'FF'FF'
FF'FF'FF'FF'FF'FF'FF'FF'FF'FF'FF'FF'FF'FF'FF'FF'
FF'FF'FF'FF'FF'FF'FF'FF'FF'FF'FF'FF'FF'FF'FF'FF'
FF'FF'FF'FF'FF'FF'FF'FF'FF'FF'FF'FF'FF'FF'FF'FF'
FF'FF'FF'FF'FF'FF'FF'FF'FF'FF'FF'FF'FF'FF'FF'FF'

There seems to be 20 bytes of data. Is that enough? Can anyone tell my data is correct?
emw525E34
11-13-2006, 08:22 AM
Do the reset sequence on your ECU.
1) Step 1. Remove both + and -ve battery terminals. Yes. Undo the bolts until cables hang loose. Put +ve and -ve cables together for 5 seconds.
this fully discharged caps in the electricals.
My Tech did this several times before.

2) Put -ve On the battery first, then the +ve terminal. Fasten tight. Start the car. PPPP might just get on for a few seconds then, OBC will prompt for clock input. fixed. Good luck.
amppa
11-13-2006, 08:33 AM
Thanks for help. I have to try that.

I already had OBC out of the car over night and that didn't help.
amppa
11-13-2006, 09:55 AM
Now I've reseted ECU. It didn't help. Still PPPP.
Ova
11-13-2006, 01:27 PM
Try this...

http://www.bmwe34.net/e34main/upgrade/OBC.htm
amppa
11-13-2006, 01:43 PM
Try this...

http://www.bmwe34.net/e34main/upgrade/OBC.htm

Try what in it?

I've made OBC upgrade long time ago. It worked well until I made reset (Test 21) from hidden menu:
http://home.iae.nl/users/bts/obc.htm

That reset screwed coding plug somehow, I think. I don't know the initial values for E34 M51D25.
amppa
11-14-2006, 05:37 AM
Now my OBC is working. I had to reprogram the coding plug.
billy
11-14-2006, 05:45 AM
Now my OBC is working. I had to reprogram the coding plug.

what do you mean you had to reprogram the coding plug?
amppa
11-14-2006, 06:18 AM
what do you mean you had to reprogram the coding plug?

I have got a chip programmer device. I opened OBC, took the coding plug out and put it into programming device.

I don't know could it be done by dealer.
DaveVoorhis
11-14-2006, 06:51 AM
Interesting. I assume, then, that the coding plug is an EPROM or EEPROM? What kind? And what did you use for source data?
amppa
11-14-2006, 07:04 AM
Interesting. I assume, then, that the coding plug is an EPROM or EEPROM? What kind? And what did you use for source data?

EEPROM, Catalyst semiconductor CAT93C46. One friendly soul helped me with the source. Couple of words were corrupted.