Voltage-Based Physical Layer Fault Diagnosis for Controller Area Network



Published Oct 28, 2022
Alaeddin Bani Milhim Hadyan Ramadhan Hamed Kazemi Xinyu Du Shengbing Jiang Hossein Sadjadi


Controller Area Network (CAN) is the most prevalent communication protocol used in the automotive industry. This in-vehicle network provides a means communication between Electronic Control Units (ECUs) and components within the vehicle. The recent rapid development of connected, electric, and autonomous vehicles expands the complexity and information exchange within CAN and demands an increase in the reliability of the network. Efficient system-level diagnosis functions need to be integrated over the network to ensure for reliability and enhance the ease of troubleshooting.

This paper presents a method to identify physical CAN faults such as loss of electrical connections and shorted wires. Fault signatures of predefined physical CAN faults are used to detect and identify the failure modes. The method can identify both permanent and intermittent faults caused by, for instance, damaged connectors and vibrations, respectively.

Diagnosis tasks are implemented on in-vehicle module by measuring and processing physical layer voltages of all CAN buses. A real-time data buffer of a predefined size is utilized to calculate health indicators from the physical layer CAN voltages. The health indicators are then compared to predefined thresholds to determine the presence and type of the fault. Compared to ground truth data, the results show that the presented method can identify with high accuracy physical CAN faults including open electrical connection and shorted wires.

How to Cite

Bani Milhim, A., Ramadhan, H., Kazemi, H., Du, X., Jiang, S., & Sadjadi, H. (2022). Voltage-Based Physical Layer Fault Diagnosis for Controller Area Network. Annual Conference of the PHM Society, 14(1). https://doi.org/10.36001/phmconf.2022.v14i1.3168
Abstract 541 | PDF Downloads 329



CAN, ECU, Vehicle, Automotive, Failure Modes, Diagnostics, Electrical, Connectors, Network, Physical Layer, Wires

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