EFI fuse keeps blowing. Please Help!

R

Rust_Bucket

New member
Truck: 1990 Toyota 4runner, v6 auto 4x4

So my truck decided to die on the side of the road yesterday. The motor would crank over but would not start. After doing a bunch of trouble shooting I noticed that the 15A fuse for EFI was fried. I put a new fuse in, then pulled it right out and it was okay. Then I put the fuse back in (using a 20A), and turned the ingition to try and start. No go. Sure enough the EFI fuse was blown again. Tried once more and had the same result. Ended up having to get towed home. So there is a short somewhere, that I'm quite possitive about. I'm just wondering what wiring I should check with knowing the details above? I was thinking ignition to starter wiring? Could the starter short out internally? Any suggestions? Thanks guys
 
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I have some more info that might help trouble shoot the problem. Yesterday I looked at my started connection (the big power wire) and the connection was all corroded. I took the connection off and cleaned it all up. The weird thing was that the nut that held the connection together looked like it had some remainace of an existing wire melted to it. I'm wondering if this melted(and missing) wire was the one shorting out the EFI fuse and then it eventually just blew off (so to speak). I can't find a loose wire that might have been connected at the starter point for the life of me. Any idea of a secondary that would be running to the starter? Where it would be coming from. Also, I'm not blowing the EFI fuse anymore. I checked my spark and I'm not getting any?! I changed the coil and still no spark. I'm thinking this mystery wire is my problem but I have no idea where it would be coming from? Thanks.
 
Iroke17 said:
there is also a small one cable that ataches about an inch farther up under the starter that is disconected wont turn over it maybe a negatve or something/\.
Click to expand...

Ah, this smaller cable could be the missing link! Thanks for all the help man. I'll let you know what I find this evening after work
 
Picture

Starter.jpg~original


This is a shot of the starter power cable connection (just below black boot). Now, should there be another wire that runs to this same power post on the starter?
 
Finally fixed!!!

So after the last week and a half of trouble shooting absolutely EVERYTHING in the Toyota manual...checking all wires, ohms, connections, components, etc. I finally came to the last step on the trouble shooting pages, "replace ecu". I had a spare one kicking around in the garage so I tossed it in and VROOOOMMMM!!!! The biotch fired right up!! Dammit I could have saved so much time, and aggrevation, argh!!! Well at least its fixed and the beast is up and running again. Thanks everyone for your input.:cheers:
 
I had the exact same problem, stranded me 300 miles from home. Had to rent a U Haul and a trailer to keep from the 800 buck tow charge. For my unit - it turned out to be the EFI relay - located right in the fuse box in the engine compartment. Changed it out - 28 bucks new - and it fired right away!
from now on I will carry a junkyard rescued spare relay as a backup

I got off lucky - no bad ECU

Carl Johansson
 
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