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2010 Mazda CX-7 sv 2.5L diagnostic port no power for scanner…

Customer Question
2010 Mazda CX-7 sv...

2010 Mazda CX-7 sv 2.5L diagnostic port no power for scanner to work, with mine or one at orileys auto parts, engine light is on and I had seen code for Po421. The room fuse was over loaded with 20amp mini. Radio was turning off on its own then quit suddenly and interior lights quit working also. When a new 20amp mini fuse was replaced it blew. I don’t think the door locks and security system is functioning now either. All other fuses look ok I don’t know about relays. One relay is blue in engine bay block top left yet all others are black in color.Read more: https://www.engine-codes.com/search_codes.php?q=Data+link+not+working

Mechanic's Assistant: Is the power loss consistent, or does it fluctuate?

Consistent

Mechanic's Assistant: Are you fixing your CX-7 yourself? What have you tried so far?

Tried to replace the fuse, and connect the scanner to verify engine light but confirmed at orileys there is no power at diagnostic port. Yet it worked before the radio quit by its self.

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

Just what common cause there is for theses concerns.

Submitted: 6 months ago.Category: Mazda
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Answered in 11 minutes by:
1/7/2018
Mazda Mechanic: david craig, ASE Certified Technician replied 6 months ago
david craig
david craig, ASE Certified Technician
Category: Mazda
Satisfied Customers: 5,795
Experience: owner/mechanic at 3D Automotive
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Customer reply replied 6 months ago
This seems to include a few more problems then I am experiencing, no way for me to really test A/C but charging starting and vehicle just yesterday made a 4hr trip. Outlet #2 is ok. Temperatures have been hovering of -4 here. I have prior changed oil, air filter, cleaned throttle body on engine thus explains the likely hood of contamination reaching bank 1 02 sensor. This cx7 is new to us as of 4 days but did notice during test drive the radio had turned off on its own 2 times. I noticed a feature of volume change during change of speed in owners hand book but the feature was turned off I noticed the first time it had quit during test drive.
Customer reply replied 6 months ago
With this room fuse shorting out, I left the socket empty. The wipers and headlights are working ok. Are you suggesting a short is steming from the ignition switch being open or short because I’m not following this?
Customer reply replied 6 months ago
Hello?
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