Hello, I have P2507 code and following http://mazda3.automotive-manuals.com...201083W06.html and getting 2.5V. Can someone please tell me what voltage I can expect here if everything is normal. Also instead of measuring the voltage at 1BA on the PCM, I traced the cable bundle along to the fusebox (first row, 7 down (Red wire)) and measure 2.5V.

I have also read that this can be a fail wire connecting the 10A EEC fuse on the underside of the fusebox. Has anyone slit this fusebox without damaging it to see what’s underneath? Is there a procedure? I have confirmed the Fuse is good, and no corrosion on line from 1BA harness to back to the fusebox.