8 bits checksum corretcion 27c257

[mexanico1971]

hi peaple !

I have this situacion !

my car have a bosh mp5.1 width a 87c257 but i want to remap it but the car dont start !
the punp fuel works for a secunds, but nothinhg more !
so ! to correct the ckecsun in this ecu it must be the same as the original but how can I find empty spaces in the map ?!

I gona left here the maps ! and one simple program editor

inf :

Bosch
0261200666
1267357457
------------------------------
Cks: 29C9
Size: 32768 = 0x8000

regards !

[eprommazza]

hi peaple !

I have this situacion !

my car have a bosh mp5.1 width a 87c257 but i want to remap it but the car dont start !
the punp fuel works for a secunds, but nothinhg more !
so ! to correct the ckecsun in this ecu it must be the same as the original but how can I find empty spaces in the map ?!

I gona left here the maps !

inf :

Bosch
0261200666
1267357457
------------------------------
Cks: 29C9
Size: 32768 = 0x8000

regards !

search zone of FF and apply correction !!!
maybe it need algo bosch 8bit
regards

[easytech]

The checksum of your 2010 mod 01 is OK. So there must be another reason for not starting.
Also when the checksum is wrong in this case the car should start with MIL on.

Edit: why will you set the revlimit to >17000rpm in theory?

[mexanico1971]

search zone of FF and apply correction !!!
maybe it need algo bosch 8bit
regards


Hi Mazza ! but I nedd 312 points to correct the cks !
I not very experience in monotronic remaps but the FF are not together they are separate !
so cant I down it before the group of maps starts !
do you think is possible to flash a 512 width 256map expendid !
because 27c256 and 27c512 have the same pins like VDD , OE , VSS etc !
sorry my ingles !

[eprommazza]

Hi Mazza ! but I nedd 312 points to correct the cks !
I not very experience in monotronic remaps but the FF are not together they are separate !
so cant I down it before the group of maps starts !
do you think is possible to flash a 512 width 256map expendid !
because 27c256 and 27c512 have the same pins like VDD , OE , VSS etc !
sorry my ingles !


I had responded quickly without seeing the file ... in some cases corrects chk 8bit
areas where they are acting that are useless (FF).
However, the car start also if chk incorrect.
In your mapping not existing (FF)
algorithm I use for this.
bosch 8bit
easytech have right
2010 mod 01 is ok

[mexanico1971]

OK !
today I recovry this project , of tuned my on car !
last week it cames finaly the pack of TMS87c257 !
I have the maps already changed for a year !
flash the 1st but error at buffer !
flash the 2st and almost Finnish !
flash the 3st and voil? it was successfully flash !
put the eprom on the socket of the ecu, and push the trigger , the car start"s , no DTC lamp on !
it seems the old B57922 that I have was broke !
wait for wile that the motor warm up and go for a ride !
very good recovery"s, even the sound of the motor was different !
I can get more than 7500 "RPM " without any engine modification, tomorrow I gonna test another file !

[mexanico1971]

HI !
test today the second mode ! more injection !
very good recovery from 40km"H up !
now I wanna see more maps !
anyone cant tell me what map is this ?!
there are two of them , cames after main injection, and before ingnicion !
thank"s in advance