jruppert,
I think you might be getting the second code because of the first code.
The Primary Fuel Circuit runs the fuel pump (for a second or two) when the key is turned on. You should be able to hear the pump (without starting the engine) and after about two seconds it should stop. This is to pressurize the fuel system.
The Secondary Fuel Circuit starts the fuel pump when you finally start the engine. Obviously, your fuel pump is working because the engine runs. Right?
It might be that because the EEC processor ROM test failed (code #511), it might not be able to determine that the Secondary Fuel Circuit is operating, so it spits out code #543!
For starters, I'd correct the problem accociated with your first code, and I'll bet it'll correct the second code too.
Don't forget to clear the "Continuous Memory" *After The Repair* because the second code (#543) is stored and will reappear if it's not cleared!
Phil
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