×

Sale ends todayGet 30% off any course (excluding packages)

Ends in --- --- ---

CANBus wiring design feedback

Practical Motorsport Wiring - Club Level

Forum Posts

Courses

Blog

Tech Articles

Discussion and questions related to the course Practical Motorsport Wiring - Club Level

= Resolved threads

Author
136 Views

I'm creating a CANBus network in a 1990 Mazda Miata using an MS3Pro PNP ECU and a few devices. I'm looking for feedback on routing and terminating the network.

I am putting four total connections on this network:

1) ECU, which has an internal termination resistor

2) AEM X-Series wideband controller (Connection near ECU in passenger footwell)

3) Banks iDash (Connection near steering column)

4) Expansion access point (Engine bay)

I have two ideas as to how lay this out based on my understanding of CAN networks. Layout 1 puts the ECU at one end with the termination resistor. Layout 2 essentially has a ~1m stub which is much longer than I've seen recommended. Layout 1 seems to be the more "proper" way to terminate the bus, but layout 2 would make for less physical wires as I won't need two separate runs into and out of the engine bay. Is there a way I can make layout 2 work with different termination?

Thanks in advance!

Attached Files

It depends on how fast you're looking to operate the bus. I've had to help folks with stub layouts similar that would punt errors at 1Mbps - but hum along at 500k - others didn't. When in doubt though I'd daisy chain as per the spec.

We usually reply within 12hrs (often sooner)

Need Help?

Need help choosing a course?

Experiencing website difficulties?

Or need to contact us for any other reason?