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15A ECU Fuse Keeps frying. What can it be? 92 SI. Electrical Go

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Old May 25, 2007 | 08:44 AM
  #1  
blk007's Avatar
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Default 15A ECU Fuse Keeps frying. What can it be? 92 SI. Electrical Gurus I need your help!

Timeline of car: Purchased Complete Shell without motor at the beginning of may. 1.5 weeks ago swapped in B16 complete Swap. Car has been running great since swap. No check engine lights nothing.

What Happened: Yesterday morning, in the middle of rush hour traffic Downtown, i'm driving and the car misses a bit. Come to a stop light. Start off again, misses some more and then finally SHUTS OFF with the CEL on. Pushed it in the corner. I reach into my glove box where i always have my wire to connect to the jumper harness to read the CEL(s).

What i did:
-Plugged it in...CEL stayed Solid. No flash.
-Turned the key off..then back to accessories to see if the fuel pump would come on..NO FUEL PUMP Prime
-Then i remembered usually if your CEL stays on but doesn't flash when you check it...it could be that your ecu burned out(i know it's rare..but it happened on my 92 Sedan) and or the Main Relay is Fubar. Anyways roadside assistance showed up to tow me to my friends shop.
-Got there and decided to try 2 spare main relays he had laying around. After trying those and still no luck. I turned my attention to the 15A ECU fuse, located in the fuse box under the hood. Pulled it and it was toasted.
-Threw in another one. Car started fine, no CEL
-Drove about 75 FT..car shuts off again.CEL again ofcourse
-popped hood, 15A fuse TOASTED once again.

I had to leave for work. My friend said after i left he tried a Different ECU. It ran for 10 mins then Toasted the fuse again. He's getting the wiring print out for the car and see what we can do from there. Anyone with experience with this prob? What can be causing the short? NOTE: She ran fine for over a week and then this.
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Old May 28, 2007 | 10:50 PM
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blk007's Avatar
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Default Re: 15A ECU Fuse Keeps frying. What can it be? 92 SI. Electrical Gurus I need your help! (blk007)

anyone?
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Old May 29, 2007 | 09:16 AM
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Default Re: 15A ECU Fuse Keeps frying. What can it be? 92 SI. Electrical Gurus I need your help! (blk007)

This sucks to hear, but it sounds like you have a wire that is grounding to the frame somewhere. My wife's civic had a similar problem, it took us awhile, but we finally traced it to a wire harness that had come out of its little plastic clip and was rubbing on the underside of the intake manifold, finally grounding out and blowing the VSS/ALT fuse.
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Old May 31, 2007 | 06:51 AM
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Default Re: 15A ECU Fuse Keeps frying. What can it be? 92 SI. Electrical Gurus I need your help! (BubblegumT

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BubblegumTate &raquo;</TD></TR><TR><TD CLASS="quote">This sucks to hear, but it sounds like you have a wire that is grounding to the frame somewhere. My wife's civic had a similar problem, it took us awhile, but we finally traced it to a wire harness that had come out of its little plastic clip and was rubbing on the underside of the intake manifold, finally grounding out and blowing the VSS/ALT fuse.</TD></TR></TABLE>

Yes..a wire is definitely grounding out somewhere....the question is where. Anyone with expierence to this problem? please feel free to contribute what caused yours to fry
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Old Jun 1, 2007 | 07:54 AM
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From: globetrotter homeworld
Default Re: 15A ECU Fuse Keeps frying. What can it be? 92 SI. Electrical Gurus I need your help! (BubblegumT

I'd get a wiring diagram, and start following the wires from that fuse to ground. You'll eventually find it somewhere, but I feel for ya -- tracing wires sucks.
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Old Jun 1, 2007 | 09:00 AM
  #6  
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Default Re: 15A ECU Fuse Keeps frying. What can it be? 92 SI. Electrical Gurus I need your help! (BubblegumT

I don't know if b series swaps need an injector resistor box but with my H22 swap, mine did the exact same think until I wired a resistor box in. It has never happened since then (3 years).
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