P0627 open fuel pump circuit

boosted12coyote

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Joined
Aug 4, 2023
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Location
North Carolina
2012 GT with Fore dual pump on hobs switch. It's had the code since I bought it. The purple wire was tied into a relay as the 12v constant with the yellow/silver wire being the trigger for the relay. The switched output goes to trigger pump 1 to turn on on my FC3 controller. Considering the pumps I just put in measure at .3-.4 ohm and the coil for a relay trigger is 50+ ohm its not suprising the computer sees it as an open circuit. Anyone dealt with this? Been told plenty its in the tune.


Also on the FPDM has no output on the yellow silver wire. There are 3 wires that potentially feed it one being ground, one gets like 2-3v igintion on, and the other 12v. Doesn't seem too out of ordinary so Im thinking its a bad module. The car currently doesn't start.

Edit: just disconnected thine before filter hose. Nothing comes out jumping either one more I could clearly hear pumps come on

Finally, o2 sensor bank 1 upstream lost communication couple hundred miles before it got parked. Get 0v on ngauge and scan tools. Bank 2 has an extension but bank one does not. I inspected the harness and could not find any physical damage. Tried a new Denso OE, and new motocraft sensor.

Any inputs appreciated, gonna dig into it more over the next couple days.
 
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