fuse number 2 PCM blows

Good evening,

If the fuse fails with the PCM disconnected, then the PCM is internally shorted out. It must be replaced.

https://www.2carpros.com/articles/how-to-check-wiring

https://www.2carpros.com/articles/how-to-check-a-car-fuse

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

I attached the diagram for you. The PCM is the only thing the fuse controls.

Roy

no, the fuse does not fail with the PCM disconnected.

Have visually inspected all engine and under-hood wiring, no faults found. Also did a shake test on wiring with a latching continuity tester again no faults found. maybe I need a new PCM, just would like to know how the PCM divides the voltage from the number 2 fuse before shotgunning parts.

That fact that the fuse does not fail means the ECM is the issue and must be replaced.

The reason is internal and special equipment is required to find the failure.

Roy

I Agree it could be a PCM internal fault, but I doubt it because the fuse blew intermittently at first. I think it could also mean a component down line of the PCM faulty. I would like to trouble shoot further before buying an expensive PCM. Replaced PCM fuse still blows.

If you disconnected the ECM and the fuse did not fail, that eliminates all the wiring up to the ECM.

Did you use a new or used ECM?

Roy