SYM Joyride 250 Mileage

[svrecar]

Hi,

Is there anybody out there who knows how to calculate mileage on this scooter ?
So far i managed to work out how chksumms are calculated,but can not figure out the mileage.

mileage is in line 40 and is divided in 2 blocks
original mileage is 31538,6
line 40 00 02 D4 C0 1F 4A FF FF 00 00 A2 F9 42 22
chksumm of block 1 is 00+02+D4+C0+1F = 1B5
1FF-1B5 = 4A
for block 2 is the same except chksumm is not last byte but first one which is A2

I can make 0 (zero) mileage which is not good enough. :)
I also attached 000000,1km (100meters) and 000001,0 (one kilometer).

I can't figure this one out. :)

Please do help if you can.

Thanks and Br,

[Arnold42]

Sorry, try this
line 40 (31538,6) : 00 02 D4 C0 1F 4A FF FF 00 00 A2 F9 42 22
chksumm of block 2 : A2+F9+42 = 1DD -> NOT -> E22 - 22 is your chksumm

Line 40 (001,0km) : .... 00 00 FF 05 E4 17 FF FF
chksumm FF+05+E4 = 1E8 -> NOT -> E17 - 17 is your chksumm
-----
But I think, block number 2 it's TRIP, block number 1 it's ODO.

[svrecar]

HI,

Thanks for answering.
My chksumms are correct...at least this is what works on scooter.
I can not figure out how mileage is calculated. I know how to calculate chksumm. You have use (INV) or subtract result from 1FF to get correct chksumm.

Br,