Skipping a long sorted story, my mechanic shorted the Fuel Pump Relay Drive wire to chassis ground. (Yes, he literally removed a section of insulator and ran a wire directly from the Green/White wire, to the chassis ground)
I believe the computer is now damaged as I can no longer hear the fuel pump activate when I turn the ignition to the on position. (I have removed the jumper wire) and I see 4.5 volts on this line when the ignition is in the on position. I believe it should be 12v and only be there for 2 seconds. Is this correct?
If it is only 4.5v and not dropping to 0 after 2 seconds, is it likely that the ECM has been damaged by the grounding out of the Fuel Pump Relay Drive line?
And finally a result. I put in a new Fuel Pump relay last year. It is now bad. I took the relay apart and and found significant corrosion. Car now runs great, except for one issue.
It now stutters at a specific circumstance while driving. 1) After you have gotten up to speed at about 2000-2500 RPM until you reduce pressure on the peddle, increase pressure on the peddle, or downshift.
This car has all new stuff, plugs, wires, ignition, fuel pump, fuel filter. air filter, you name it.
