Hi All, I have a 2004 Jeep Grand Cherokee, 67500 miles, 4.0 6 cyl. Driving and it just shut off. Replaced fuel filter and fuel pump, still don't start. Checked and no pulse to injectors. Found a blown fuse in the power box for the fuel injectors. Replaced and as soon as you turn the key to on, it blows the fuse. Pulled all injector wires. Forgot to mention it will run on ether. Fuel pump does run. Pulled fuse for the ASD inside the jeep, and fuse will not blow when key is turned to the on position. Have traced wires to no problems found. Can anyone PLEASE give me more ideas. Grounding issue with PCM?

 

Check the wiring on the O2 sensors. The wiring can short and blow a fuse. I believe it is fuse 20 which is a 20A fuse.

 

Not sure with your grand but a guy I know that has a 96 cherokee he had a wire that goes to the fuel pump rub the "frame" and it shorted out. His fuse kept blowing.

 

Check wiring harness where it goes in back of the head by the firewall. Jeeps have a problem with the wire loom melting and the wires chafe.