A very English EFI system

[John Andrianakis]

Once tried to reprogram the eprom in a Rover MGF VVC. Its a 27c1024 plcc 44
item. It was really very difficult to locate the maps with the emulator.Most
of the bin file is 16bit but some areas are 8bit and very confusing. In the
process while changing the values on unknown map the car died. After that it
refused to idle but would work ok otherwise. The ecu had to re learn how to
idle. That was accomplished with the Rover MEMS diagnostic aquipment at a
dealer and not very easily. It required not just a normal reset of all
learned values but to treat it as a brand new ecu. The relearning took over
30 min while I watched the ecu trying to work in closed loop, continiously
closing the range of a/f ratios used and responding faster. The engine
started rough and smoothed out during the day.Unfortunately the owner got
scared that something even worse might happen to his brand new car so we
dropped the tuning left it normal. I have not come up to another one yet. I
have the stock bin file if you want to see and  schematic of the wiring of
the mems ecu but only one of the connectors(have to scan this one though).
Hope I have helped.
Regards,
John Andrianakis.
-----Original Message-----
From: Robertson, Nigel <nigel.robertson at roke.co.uk>
To: 'diy_efi at efi332.eng.ohio-state.edu' <diy_efi at efi332.eng.ohio-state.edu>
Date: ÔåôÜñôç, 12 ÌáÀïõ 1999 4:38 ìì
Subject: A very English EFI system


>HI,
>
>This is my first post to this mailing list, although I have been reading
all
>your comments for some time now.  They have been both interesting and in a
>lot of cases useful.
>
>This may be a long shot but have any of you guys had any dealings with the
>Rover MEMS engine management system designed by Motorola.  I would like to
>look more deeply at this system because I have two cars which use them.
>However, the automotive industry in the UK is a very Secret society and
>getting any information is virtually impossible.  Any information from
>dealers is usually wrong because they do not have the technical expertise
to
>answer questions.
>
>So, I am trying this list as a last resort.  If anybody has opened one up I
>would be interested in hearing from you, or , if anyone is interesting in
>trying the US route of gaining info for me (Freedom of Information is a
>wonderful thing) I would be most grateful.
>
>Thanks In Advance
>
>Nigel
>
>_________________________________________________________________________
>Nigel Robertson, BEng. CEng. MIEE.
>Senior Engineer
>Roke Manor Research Ltd
>Old Salisbury Lane
>Romsey
>SO51 0ZN
>Tel 01794 833524
>Fax 01794 526943
>email  nigel.robertson at roke.co.uk
>
>