Mazda Repair Questions? Ask Mechanics for Answers ASAP
Hello, my name is ***** ***** I am a professional here at Just Answer. I have noticed that your question was not getting a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.With everything you have replaced I would start with checking the harness from the ECM to the distributor. I have enclosed some test steps to check this. Copy and paste the link below to open and view it.https://dl.dropboxusercontent.com/u/104923897/ECM%20test%20Oct%2013.pdf
Run the steps I sent you and let me know the results and we can work from there.
Are you sure the new distributor is not defective?
Yes but you will still need a scope to check it. See it below.https://dl.dropboxusercontent.com/u/104923897/Dist%20test%20Oct%2013.pdf
Yes VREF voltage come from the PCM and this does sound like a failed PCM especially if you found a burned spot.
It sure sounds like you have it. Im here all day so post back if need be and we can work from there.