ENG CONT fuse keeps blwoing, car won't start. Anyone have experience with this?

[endgame]

Hello, I have a 1991 240sx hatch with an sr20-det redtop swapped in. The car was starting and running fine, but one day I went to start it and I heard a crackle and a pop.

After going through the fuse boxes, I found that a relay in the engine bay labeled "ACC" had a burn mark on it. The Air Con relay was the same one so I switched them.

Next, on the fuse box next to the battery on the passenger side, I found a burned section of wire. I cut it out and soldered in a same gauge wire and wrapped it in heat shrink wrap. That wire led to the ENG CONT fuse, which is a 10A fuse, and it was popped, so I replaced it.

Now, I went to start the car, but nothing. As soon as I turn to key to ACC (or II) on the ignition, I can hear the ENG CONT fuse just pop. There is no crank or anything.

Can anyone help me, or give me advice as to how I could go about fixing this? I can't seem to find any shorts in the wiring, but there has to be one. I need this fixed ASAP but I'm at my end here.


Here is a wiring diagram, I pointed out where I think the ENG CONT fuse is, the burned wire was on about 3-4" away from the fuse box, and the bunred section was about 6" long.

http://img24.imageshack.us/img24/6827/engcontsr20det.jpg






I appreciate any and all help, even if it's just brainstorming with me, anything is helpful.

Thanks.

[projectRDM]

Everything on that circuit is culprit, easiest way is to unplug all of it and start tracing one by one, plugging in as you go.

[JDMPowerdS13]

Also hate to say it could have an ecu issue as well

[Pacman]

Everything on that circuit is culprit, easiest way is to unplug all of it and start tracing one by one, plugging in as you go.

Do this. When you find what is making the fuse pop (i.e. O2 Sensor) look at the wires for a short to ground (like the shielding missing). Something probably (sp? doesn' look right) has rubbed through. Look at just that circuit, not the overall wiring view.

[steve shadows]

This is sadly common in cars with shit harnesses.

The first thing I do on a newly swapped car or even a beat up dirty KA car is pull the engine harness and buy a brand new one from Nissan and re-install.

[Joshua M.]

endgame, have you had any luck with your problem?

[DALAZ_68]

Do this. When you find what is making the fuse pop (i.e. O2 Sensor) look at the wires for a short to ground (like the shielding missing). Something probably (sp? doesn' look right) has rubbed through. Look at just that circuit, not the overall wiring view.


^ that...especially if other wires have already burnt prior... something could be arching...