CAN network planning & termination

CAN hardware and message compatibility

Devices need compatible bus types, bitrates, protocols, identifiers and data definitions. A working electrical connection is not enough: the ECU, dashboard or lambda module must understand the messages or support configurable reception.

Should every CAN bus measure 60 ohms?

On a conventional high-speed CAN bus with two 120-ohm end terminators present, a suitable unpowered resistance check is typically about 60 ohms. Check topology and built-in termination first. Some MaxxECU GEN2 revisions disconnect their software-controlled resistor when unpowered, so one reading alone is not a universal pass or fail test. Never measure resistance on a live circuit.

CAN Lambda installation checks

Use the exact ECU wiring diagram; verify every circuit for continuity and shorts before connecting power.

Match the CAN speed and sensor address, provide protected heater power, and follow the ECU's CAN termination requirements. Plug-in ECUs may need additional CAN-access cables.

Make a node list

Create a node list recording each device model, bitrate, protocol configuration, message identifiers and termination-resistor location. Keep the hardware and firmware versions together with the wiring diagram.

Power up a known configuration first. Confirm that the ECU receives plausible data and reports stale or missing messages before enabling control functions that depend on that data.