1998 Jeep Grand Cherokee • 117,000 miles

The ECM fuse keeps blowing and was wondering if you could direct me in the direction as to what may be causing it to blow! All help and answers would be greatly appreciated! Thanks in Advance for your time! Its a 1998 Grand Jeep Cherokee Laredo 4.0 6 cylinder.
March 2, 2013.

First look at the wiring harnesses for the oxygen sensors to see if one fell down onto hot exhaust parts.

A simple trick to finding a short is to replace the blown fuse with a pair of spade terminals, then use small jumper wires to connect them to a 12 volt light bulb. A brake light bulb works well. When the circuit is live and the short is present, the bulb will be full brightness and hot so be sure it's not laying on the carpet or against a plastic door panel. Now you can unplug electrical connectors and move things around to see what makes the short go away. When it does, the bulb will get dim or go out.

Mar 2, 2013.