Blown ENG fuse and veh still runs?

[greatmizzou]

2000 k3500 5.7 4l80e 

 

So Im going to start doing some maintenance on the auction chevy I got a few weeks ago.  It started on the lot and was driveable but it was really loud / rumbly and lacked power.  Transmission felt fine.

 

Ran OBD2 and found the following codes:

P0102 - MAF low input

P0171 - system lean

p1351 - Generic dealer code

 

The battery was crap and died after a week, it is now at 6v.  I have a spare that can hold 12v for a bit so will use that.  The battery cables are terrible and need replaced, frayed at ends, connections terrible.

 

I then looked at the fusebox and the ENG fuse was blown.  Not 100% sure but I think this fuse handles

"MAF sensor, O2 sensors, crank sensor and Evap system valves it also connects to PCM."

 

this blown fuse seems like it would be a cause of my engine issues and the cause of the blown fuse is probably grounding/shorting from bad wiring

 

heres my question, should it even be possible to run and drive the truck with a blown ENG fuse??

 

 

Edited August 12, 2022 by greatmizzou

[Brian Lindsey]

this is just my opinion , based on almost logic , the engine should not start and run , because the computer controls the whole truck engine , transmission , everything , no computer no start or run

[richard wysong]

I believe there are also a couple  ECM fuses  in the box under the hood

[richard wysong]

I believe there are also a couple  ECM fuses  in the box under the hood. Before trouble shooting that fuse research exactly what it powers. Not likely it does crank sensor or it probably wouldn't start