Keep blowing 20 amp efi fuse.

I’ve checked everything I possibly could. Keep blowing efi fuse and it is as soon as I turn the key. Any ideas?

 

You obviously haven't checked "everything you possibly could" if the problem still persists.

I would download a wiring diagram for the EFI system (google). Start at one end and go to the other. You've got a short somewhere.

 

Think the relay could be bad that is under the kick panel?

 

Anything is possible .

Relays seldom short the coil opens or the contacts burn fast or wear out

I would look for physical damage to the wire harness Rodent damage.

 

Can you give us a rundown of everything you've done recently? This will help us to know where problem areas might be.
Did you remove the stereo and verify those connections and wires are protected correctly? Stereo install is only thing you've done lately? If you did not use a plug and play harness and you cut and reconnected wires, there is likely an issue with that

 

Well the fuse is not breaking on acc so that tells me it rules out the stereo. It only blows on the on position.

 

That may rule out the stereo itself, but not a hack wiring job behind it. I'll peace out, I won't waste your time or mine

 

Find out what circuits use same fuse and go from there .Can disconnect thing in circuit to try eliminating circuits. Example my 05 rav for 10amp gauge fuse affected ac power windows cooling fans charging system .

 

okay? Sorry dude. I checked all the wires that were l wired into the radio harness. Iv got my whole dash apart right now lol cannot find any wires just yet. Waiting on a friend to get here to use his probe meter to find the short. Thank you for your help anyways.

 

Problem happened right after radio install ? Any ways try checking o2 wires see if shorted .Some had problems with shorts on o2 harness blowing fuses . Easy visual while waiting for your friend .

 

Yeah that was the first thing I did even took them off to try to start.

 

I had a similar issue, mine was the 15amp EFI? It was a wire being grounded. It took me awhile to find the issue. It was also in an area I looked multiple times. So even looking “everywhere” you can still miss it.

Already taped up...

 

Is that on the passenger side?

 

Yes, please explain exactly where this is. I have a buddy with a 3rd Gen 4runner with the same exact problem. We were 4wheeling in Death Valley and this problem ended his trip. Would love to find out he's have the same issue and this will fix his problem.

 

This is on the passenger side lower part of the console. The wires you see there is going to the shifter. Because of the short, none of my power windows would work and I had to use the shifter release tab to take it out of park. However the truck was still drive able and everything else was functional. The fuse would break every time I turn the key to the first click (ACC). It was cause by the wires getting pinched between the plastic cover and that metal bracket, has a burn mark in the photo. Eventually the edge of the metal bracket rubbed off the wire insulation and expose the wired. I would look around places where wires are close to metal brackets and see if one is grounding itself.

 

Hmmm, this is different than my buddy's problem. He doesn't have any other associated issues with his fuse blowing as far as I know. But, he has a wire somewhere that's grounding out and he has yet been able to find it. His problem is also intermittent. He can drive for a long time and have no issues. Then, out of the blue, the fuse will pop again leaving him stranded.

 

Any consistencies at all that he's noticed? If it's truly completely random....... Good luck man. There's gotta be something

 

That sounds like a nightmare. At least my problem was instant (easier to diagnose) and the truck drove without problem. Worst case is take it to the dealer and have them chase all the wiring. I’m sure they have the equipment to find the short, if there is one.

Is he able to put in another fuse and drive or does it take time for the problem to reset?

Keep us updated so we know for further reference.

Electrical problems are a pain to diagnose.

 

Sometimes he can put in another fuse right away and he's good to go for a while. Other times it keeps blowing fuses over and over again like it did in Death Valley.

Taking it to a dealer to diagnose could be very costly with the labor rates in California. My local dealer charges $200/hour.

If my buddy finally figures it out, I'll respond back to this thread let you guys know what it was.

 

Do you have a multimeter, and a wiring diagram for your truck?

Cause if not, you’re going to be pushing a rope. You need to be able to trace the circuit, in diagram and physically, and see every wire and every component that sits on that fuse. That is the only way.

I had an issue with an engine cutting out years ago in a Miata. Wasn’t blowing fuses, didn’t affect the chassis electrical, just the engine would momentarily shut down then fire back up intermittently. Long story short, one of the cam position sensor wires was grounding, it would freak out the ECU.