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Got this code over the last few weeks. The description is Evap Emission input signal low. Basically it's reading low voltage from the sending unit, but not sure why. I'm using it in a properly vented 20 gal summit fuel cell after doing my 4 link. Bad sending unit perhaps?? I did manage to drop it onto the shop floor before getting it installed.

I have done alot of welding for the rear setup and the new tube bed and it's possible there may be a pinhole in a vacuum line somewhere also.
 

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ECM has failed
EVAP pump module connection is damaged
EVAP pump module has failed
:2cents:
 

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Check the wires going to the charcoal canister for damage. Three of them are for the pressure sensor looks like pin 2 3 4 at the canister are for the pressure sensor. That code points to an open circuit on one of those 3 wires
 
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