openecu.org

Hi
I'm doing some investigations on a DSM ECU fitted to a Suzuki Vitara. The processor is a Mitsubishi MH6211, this is an 84pin PLCC. I have pulled the PROM and looked at the binary. The main code appears to start at $4000 and I have had some limited success attempting to dissassemble this using DHC11. The first block of code appears valid, mainly CALL instructions. I have a partial pin out traced from the EEPROM (27C256), this does not tally with the pinout for a 68HC11K (1st guess). Does anyone have any information that may help me?
Thanks
James

Some more information:



The processor is at the bottom, the next large PLCC on the left hand side (50pin 65013) is connected to both address and data busses, this appears to be a Port Expander, there are two jumper resistors, one marked Mon. The E clock and RW pins are identified also.
The 44 pin PLCC (91AE1KW) located at top left is connected to the 50pin PLCC and the analogue inputs (A/D?).

There are 3 pads for a connector (bootloader?) below the processor. The connector outline is marked on the silkscreen, has anyone seen a similar connector on another ECU, the pin out would be very useful.

here is the partial pinout of the processor:



Thanks
James

HI.
MH6211 - OTP processor, not flashable.
M65013L-E315 is a special ASIC, used as port expander, it is absent in ECU's without EPROM.
about third chip - IMHO it is a E310 - firing coprocessor with some I/O functions like CKM/CKP and diagnostic data transfering.
A/D convertor inside MH6211.

Thank you. That makes sense, I have looked at the ECU some more, the diagnostic port (old style OBD) does go to that third chip and it is on the data/address bus.
I also have an OBD2 connector but there is only one data line which is on pin9? This interface is shared with the immobiliser. My storage scope is U/S at the moment so I haven't been able to have a good look at that.
I shall carry on looking around it, any other information that anyone can provide me with would be very helpful. I haven't seen any real information specific to the Suzuki variants on the net.
Thanks
James