DI injector

[Ernesto14]

So I'm pretty sure it's been posted before but I can't find the answer. I have an 02 GTX DI that needed a new fuel pump, it took me a while to get, something like almost a year, but it finely came . I installed and started her up just fine. Ran for about 10 min and then she shut off by herself when gave it a little gas. I went to turn it back on and nothing no cranking or nothing. Checked all the fuses and nothing, made sure starter wasn't bad at its working still. And now I put the key in and no beep and every time it blows the INJ fuse. Anyone who could shine some light would greatly appreciated. Or maybe a link to where I could find the answer would cool too. Thanks again in advance.

 

[Sportster-2001-951C-Stock]

Does the fuel pump run at power up? I guess it doesn't. One quick approach is to unplug a bunch of stuff from the harness first, such as fuel pump and regulator/rectifier, etc. then plug stuff back in one at a time till the fuse blows. 1st suspect for me would be the fuel pump but hard to say for sure.

Here's the electrical schematic for the 2001 DI, a more clear version is in the service manual of course:

 

[Sportster-2001-951C-Stock]

Okay, so I'm looking at the schematic and I see the 15Amp INJ fuse powers 9 items, can you see this in the upper right corner of the schematic? I would unplug these items and then reconnect one at a time till the fuse blows. This would give you a direction to follow.

 

[Ernesto14]

Nice, that's my next step. Yes the pump turns on or powers up when key is inserted.

 

[Ernesto14]

Which applications go to that fuse, to make it go easier...

 

[Sportster-2001-951C-Stock]

Both fuel injectors are powered through that fuse, the buzzer, "crank relay" (I guess that means starter solenoid in ignition coil box), RAVE relay, both air injectors and both ignition coils.

Seems you could easily isolate all the fuel and air injectors by disconnecting connector #4 from the MPEM but I'd probably disconnect each one separately at the injector connector to make it faster to isolate the individual one.

If for example you disconnect all of them separately and the fuse still blows, then by disconnecting the connector #4 you can isolate the harness or the injectors individually.

Don't install a fuse larger than the size 15Amp fuse or some damage will occur.