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No Answer from ECU; Error: 204; Function: DownloadFile"

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NickFro:
When trying to download a new file to the ECU, I get an error message after about 3 seconds that says "No Answer from ECU; Error: 204; Function: DownloadFile".  The controller seems to be functioning properly otherwise.  The existing file stays loaded after failing to download the new file.  I have a number of different files that I know are good, and have tried multiple times.  Is the controller toast, or is there something else I can do?

Jakob:
Hi NickFro

The first thing I would check is the wiring.
   Resistance 60 ohm total, and all that.
   Controller outputs being overloaded or disrupting the controller.

Next, are there any other controllers connected?
   Conflicting nodes for example.

Third, are there any changes in the programs CAN-bus setup?
  Node, baudrate and so on.

I'm sure somebody has a few more things to look for, but I in my book those are the places to start.
If it is a new controller, it is unlikely that it is toast. But never say never.

Have you tried the same program with another controller?

I hope this helps
BR Jakob

NickFro:
Someone had switched the CAN BUS wires on me.  Should have looked at that first.  Thanks.

Jakob:
Your welcome :)

Ascorige:
Isn't this a also symptom of a controller with a faulty CAN system?

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