Networks Beyond CAN
Where LIN, FlexRay and Automotive Ethernet are used and how they fail.
Loading…
What you will learn
- Describe LIN, FlexRay and Ethernet
- Explain their roles
- Recognise their faults
Advertisement
CAN is not the only network. LIN is a single-wire, low-speed bus used for simple devices such as mirror and seat controls. FlexRay is a fast, deterministic, time-triggered bus used for safety-related systems. Automotive Ethernet carries high-bandwidth data such as camera and diagnostics traffic.
Each has its own physical layer and diagnostics. A fault on one bus affects only the modules on it, but the gateway can spread symptoms if it is involved. Diagnose the specific network a module uses rather than assuming CAN.
| Network | Speed | Typical use |
|---|---|---|
| LIN | Low | Mirrors, seats, simple actuators |
| CAN | Medium | Powertrain, body, chassis |
| FlexRay | High, deterministic | Safety systems, active suspension |
| Ethernet | Very high | Cameras, ADAS, DoIP |
Key points
- Different networks, different jobs and tests.
- A bus fault only affects its own modules.
- Identify the network before measuring it.
Loading…
Key points
- LIN is cheap and slow for simple devices
- FlexRay is fast and time-triggered
- Ethernet is used for cameras and data
All values shown are training examples. Real thresholds depend on the manufacturer, engine, temperature and system — always confirm with the vehicle service documentation.
Advertisement