The EECM (PCM) should not prevent the fuel pump from coming on if it is getting the signal from the ignition switch.
So, what the ignition switch needs to do is just send voltage to the EECM so that it knows a good key has turned the switch and the clutch is pressed or is in park or neutral. If these things are true then the EECM gets voltage on the ignition feed circuit, and it then sends power to the starter, ignition and fuel system.
So, if the engine is turning over then the EECM is seeing this signal from the switch circuit. If the fuel pump is not coming on, then we will have to figure out why the fuel pump is not coming on.
It is possible that this is caused by this not being assembled however, it is unlikely on this older truck.
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Sunday, December 12th, 2021 AT 10:47 AM