Dongle trouble #3

Today I received an email stating that some KONNWEI’s are shipped with a 20 ohm resistor across the CANbus. This is a massive production fault. First of all, normal bus termination is 120 ohms, second, the dongle should not impose a new termination resistance at all.

Now, I am not saying this is the root problem of the recent KONNWEI issues. I need to do tests, and I will try to do them tonight. It is still possible there are additional firmware issues, and in fact, earlier measurements indicate there may be indeed. This resistance problem might cause problems though with some ECUs and not with others, making everything transient and hard to tackle. I am extremely grateful to Amazon user for finding this error and SpeakEV member cDy for relentlessly pursuing the issue and following tons of reviews.

Stay tuned. If this is indeed the main problem, at least there is a path to a solution.

Latest KONNWEI guts with faulty resistor. Flat cable and crystal on the PCB

Old KONNWEI design with the wiring loom and the floating crystal

Posted in Hardware

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