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From WiX Wiki at MindCapers

Question (8 Oct 2008)

Any tips on figuring out MakeSfxCA errors?

Answer (8 Oct 2008)

There's no way to get a more detailed error printout without modifying the code of the MakeSfxCA tool. The easiest way to diagnose the issue would be to capture the command-line from your build log and then launch that same command-line in a debugger:

devenv /debugexe MakeSfxCA.exe <parameters>

If you don't have it already, the source code for MakeSfxCA can be found in wix3-sources.zip, in the src\dtf\Tools\MakeSfxCA directory.