HSERIN String reading

[Dave]

Looking at the garbled data I would first look at the interface levels and states. When I used one of these OBD interface chips quite a few years ago it was designed to be connected DIRECTLY to the PC. That means the signals are already inverted. To interface it to a PIC you will need to Re-invert the TX and RX signals before connecting it to the PIC. Look at the data sheet. I used an ELM322D OBD(VPW) device.