bosch efi info???

[Brian Neill Tiedemann]

Hi again folks,
I have had an ecu sitting around for a while here and have taken a renewed
interest, as it is HC11 based, and my own controller project is well on
the way... I would be curious to see how others have done things, and I
would also like to later apply this ecu and its sensors to a similar
engine to its original application, with some tweaks.

The unit is based on a 68HC11A8 for the main processor, and a 6805S3 for
limp home mode. The system (in Australia at least) was used on some CA20
engined Nissan Pintara models, and some of the other clone models under
different badges. It uses a bosch hot wire AFM and EGO, as well as other
i/o as follows: 4x batched injectors(1group),coolant temp sens,throttle
switch,2  coil ignition control (still using "double" dist.),engine 
position from distributor, vehicle speed sens,a/t lockup ctrl+start
inhibit,fuel pump +3 other main controlled relays, a/c and 2 cooling fan
relays, IAC valve (stepper controlling pintle valve)and thermal air
bypass.Also has an ECM lamp on the dash for diagnosis and limp indication.

I think the one I have was for a/t models, though the manual was not a lot
different.

I have most of the Nissan shop manual pages refering to the system, and a
fair idea of the ECU internal circuit diagram worked out. I am interested
in the source code, or even a hex dump for a start of the software in the
rom/eeprom of the HC11, and also in the 6805S3. 
The PCB has room on it for an external rom to be added and an address
latch, and there is also a prototype/production link on the moda pin of
the HC11.... Methinks it should be fiddle-able to use external memory and
play. If not I would still like to understand it all better.

Also, any code at all that people can help me with for efi related use
of a HC11 is of great interest, commented or not, hex or source.

Lastly, I may have a way of reading out the code in the processor now, and
I recall discussion of some HC11 Disassembly s'ware .... where do I look
or who do I ask before starting to write my own?

Thanks in advance for any help... sorry for the loooong post.
Reply in person if more appropriate, to:

bnt at minyos.its.rmit.edu.au OR s914440 at minyos.its.rmit.edu.au

cheers,
Brian.