This page contains schematics and a PCB layout for a device to interface RS-232 to the ISO9141-2 / SAE J1962 (OBD-II) diagnostic connector on many Volkswagen, Audi, Seat, and Skoda models.
Auterra manufactures and sells Palm OS based OBD II scan tools and dynos. Our hardware and software turns a Palm handheld into an automotive diagnostic instrument. Turn off the Check Engine light, avoid buying a lemon for your next used car...