CAN and OBDII

GPS devices read engine data and fault codes via CAN bus and OBD-II. Covers DTC decoding, communication protocols, and OBD device fundamentals.

This section explains how GPS devices communicate with vehicle electronics through CAN bus and OBD-II interfaces, covering the protocol landscape, plug-and-play OBD devices, and how to read and interpret diagnostic fault codes.

Contents

• Intra-vehicle communication: CAN, FlexRay, and MOST: How ECUs exchange data over different in-vehicle network protocols.

• OBD device fundamentals: How plug-and-play OBD devices connect to the diagnostic port and what data they expose.

• DTC (Diagnostic Trouble Codes): How to decode fault code structures, interpret error categories, and act on diagnostic data.