Anyone know how I can read a J1850 line in my bike using an Arduino?
This is not the answer, but these sites has info that perhaps can help you.
It seems to be possible...
http://pinouts.ru/CarElectronics/obdii_j1850_pwm_vpw_cable_pinout.shtml http://pinouts.ru/CarElectronics/car_obd2_pinout.shtml
Thanks!!! 