If it is the one I think it is, it feeds 80% of the electronics under the hood.
There are two areas that are extremely common to cause this problem. Directly off the fuel injector harness where it goes down toward the water neck on four cylinder models (only), and on the section of harness that stretches across the top of the transmission between the battery and the water neck (both engine types).
The latter is the most common, as the harness chaffs against the water neck and transmission aluminum and rubs through. It will NOT look obvious... if you pull the harness up it will be nice and clean and sealed up in conduit etc. This doesn't mean it is good. If you open it up that is when you find the damage.
I am attaching below a photo of one I had recently where you will see the red/white and solid red wires pierced and shorted well inside the conduit (mirror is used to see the bottom of the wiring).
If you can confirm this is the case, bandage the wiring and rig some sort of cushion to prevent it from contacting the metal any more.
If you are absolutely certain there is nothing going on there (and fuse still blows even when you shift the cable around), then and only then would I start unplugging electronic components under the hood one at a time until the short goes away, indicating the component/pigtail at fault.
For the most part though... when it is the red/white wire shorting and killing the engine, it is usually the wires pictured.