What data is commonly carried over a CAN bus in vehicle telemetry?

• A. CAN bus provides vehicle network data such as engine speed, coolant temperature, and fault codes.
• B. CAN bus is a wireless protocol for internet.
• C. CAN bus stores data on local hard drive.
• D. CAN bus is only used for audio.

Answer: (A)

The data carried over a CAN bus is the real-time vehicle network information exchanged between ECUs and sensors. CAN is a wired, differential serial bus that allows multiple control units to share messages on a single network, so telemetry systems can read important signals like engine speed (RPM), coolant temperature, and diagnostic fault codes, among many others. The message structure uses identifiers to indicate what data is being sent and its priority, which is crucial for timely monitoring and control.

This isn’t a wireless protocol for internet access, nor a data storage medium, and it isn’t limited to audio. It’s the backbone for in-vehicle communication, enabling the flow of diverse operating and diagnostic data that telemetry systems rely on.