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15A ECU fuse keeps blowing!! Electrical guys jump in

Old 29-May-2007, 04:13 AM
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Unhappy 15A ECU fuse keeps blowing!! Electrical guys jump in

The car is a 92 SI. purchased just over a month a ago as a complete shell. Swaped in motor like 2 weeks ago. Car ran fine for 1.5 weeks then i was driving...car missed a couple of times and shut off. had it towed...check under hood fuse box, noticed 15A ecu fuse is fried..I replaced fuse, drove not even 100 Feet and the car shut off again. Sure enough it was the fuse again. Handed the problem over to my friend who's experienced with electrical...long story short after he did some investigation into it..He ran a new wire directly back to the main relay...incase the wire was pinched or something.

We thought that would be the end to it as the car drove fine for half an hour..then shuts off. Sure enough i check the fuse..it's fried. What now?? I hate electrical problems. Long and hard to fix. Thanks in advance.
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Old 29-May-2007, 11:28 AM
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Check for shorts at the ecu itself. I'd check over every wire at the ecu harness to make sure none of them have wire that is exposed.
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Old 29-May-2007, 05:12 PM
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Replace ECU with test one from another car. See if that fixes problem, if not, get your wiring diagrams and start tracing!
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Old 29-May-2007, 07:13 PM
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what fuse is this?
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Old 29-May-2007, 08:02 PM
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Re: 15A ECU fuse keeps blowing!! Electrical guys jump in

Originally posted by 1ofAkind
check under hood fuse box, noticed 15A ecu fuse is fried..
c'mon c-pos, get it together.
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Old 29-May-2007, 08:18 PM
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whoops.

well i'd print of the wiring diagram and start tracing those wires. its rubbing through somewhere. Or try swapping ecu's (if thats easier for you)
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Old 29-May-2007, 09:05 PM
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haha i had that exact same fuse go on me, its because my elongated O2 sensor got caght in the driveshaft and ripped it to shreds lol
wasnt so funny at the time
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Old 30-May-2007, 12:45 PM
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Originally posted by kIeRaN
haha i had that exact same fuse go on me, its because my elongated O2 sensor got caght in the driveshaft and ripped it to shreds lol
wasnt so funny at the time
The top of my o2 sensor presses right against my steering rack because of my header. I don't think any of the wires are phucked though...

Originally posted by username
Replace ECU with test one from another car. See if that fixes problem, if not, get your wiring diagrams and start tracing!
Already did that before posting...ofcourse it didn't work. Also my directly ran a new wire from the fuse all the way to the main relay just like it does on the harness...did not solve problem. Ofcourse we did that to see whether or not the wire was being pinched somewhere...but no go. Any other suggestions before the dash is ripped out to see what's going on?
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Old 30-May-2007, 01:45 PM
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why would you rip the dash out?
Before going all crazy here, check the wires at the ecu harness for shorts. I'd really check the power/ground wires, get an ecu pinout and start with that.
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Old 30-May-2007, 03:33 PM
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If there is a pinched ground somewhere, that might trip your fuse right?
Try 2 wire from constant, + and - see what happens?

Edit: Sorry, pretty much what Zeeman just said, wasn't it? LOL
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Old 31-May-2007, 11:42 AM
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Originally posted by zeeman
why would you rip the dash out?
Before going all crazy here, check the wires at the ecu harness for shorts. I'd really check the power/ground wires, get an ecu pinout and start with that.
Got ya Z...will look into that. Had to have map sensor wired into ecu pin out when motor was swapped in..i'll recheck those wires and start from there on the ecu harness...I told my friend this..but he argues and says That there's no continuity or connectivity between that fuse and the ECU..which is current when you refer to the wiring schematics of the car. He's saying there's a prob on that circuit...then you start with that circuit.

The circuit goes from the fuse back to the main relay. He's saying the ecu has nothing to do with it because when you turn you key...the main relay activates the ecu and once again..there's no connectivity between the fuse and ecu..All the engine grounds seem to be fine.. I've argued with him about other grounds, like for sensors and what...but he's saying that they wouldn't affect that circuit and pop the fuse...they'd throw a code for that specific sensor. Will keep you posted.
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Old 31-May-2007, 11:45 AM
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i was more referring to the power/ground wires of the ecu, there are a bunch of them....this is where a pinout will come in handy.
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Old 06-Jun-2007, 10:38 AM
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it ended up being that the o2 wires were grouding out on the steering rack. Had the o2 relocated to the side of the header at the exhaust shop.
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Old 06-Jun-2007, 10:51 AM
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lol...oh man.
Its good that you posted the results though.
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Old 06-Jun-2007, 06:13 PM
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Originally posted by 1ofAkind
it ended up being that the o2 wires were grouding out on the steering rack. Had the o2 relocated to the side of the header at the exhaust shop.
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Old 06-Jun-2007, 06:28 PM
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shoulda listened to the k-man
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Old 06-Jun-2007, 06:31 PM
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u bet, im always flippin ' right
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Old 06-Jun-2007, 11:22 PM
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lol...i should of...it's my own damn fault...all of that wasted time
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