Which two wires are the ones to check for voltage with at the fuel pump control module? I’m trying to narrow down a fueling issue during WOT.
FPCM voltage check help
- Thread starter Gruca
- Start date
I found a diagram on the VMP bap install instructions. I hooked one up to the power wire and touched the other to a grounded bolt. I tested both my FPCMs’ voltage and at partial throttle they are around 14.3 and at WOT voltage drops to 13.8...
does your car/alternator voltage drop down that far at wot too?
how are you checking it during wot?
is alternator set to drop voltage at high rpm?
how are you checking it during wot?
is alternator set to drop voltage at high rpm?
At WOT is when it does drop. And apparently this is normal due to load, which will lower the voltage.
At the FPCM, I was watching it with a GoPro pointed at a multimeter that I tied strapped down in the truck.
At the fuel pump itself, I just had the multimeter in my hand during the WOT runs.
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