I am putting my car back together, when I key on the ignition I instantly blow the EGI Fuse on the main fuse block.

First I thought my problem was in the main engine harness, it was not as I have completely removed the harness from the car and the fuse still blows.

The next thing I eliminated was the alternator/coil pack harness, I disconnected that and it still blows.

I believe the next thing to look at is the main body harness. I see that there is only one wire directly under the EGI Fuse which is white with green. Does anyone know where this wire goes?

I read many threads about why the EGI fuse blows. Most have to do with the fuse blowing while people were driving and do not really apply to my situation. If anyone has any information that might help, please share.

 

The W/G wire goes from the EGI fuse to the x-12 connector and then to the black/white wires of alternator.

 

Did you remove any of your fuse box wires when putting the car back together and perhaps switched a wire somewhere?? Just guessing as the EGI is only to the alternator, diagnostic box, and the EGI main relay. For you to blow a 30 amp use on by key on ignition, not sure what other circuits would push amps through that relay to blow it.

 

oh, to state the obvious check your wiring for a short to ground in that fuse's circuit...short to grounds will blow your fuse...

 

Thanks for the reply. I did have the main body harness out of the car and extended a few wires, but did not separate the fuses from the harness at any time.

What is the x-12 connector? Also I rewired my fuel pumps giving them direct power from the battery. I am going to look into that wiring today to see if anything could be causing this.

 

x-12 is a common connector between front and main engine harness...11 wires in that connection.

 

Did you wire a new independent relay for the fuel pumps or are you still running of the stocker?

 

I used a new independent relay for the fuel pumps. Double checked all that wiring this morning, tried disconnecting it all and it still blows.

 

weird...I'm guessing there is a short to ground somewhere...check that connection as it leaves the firewall. If you can measure how much amp is going through it may help diagnose it...but probably not greatly.

 

OK, made a small discovery. The EGI fuse does not blow if the engine fuse above the dead petal is removed. It also doesn't blow if the EGI relay is removed and the engine fuse is in place.

 

When I pull JB-04 from the back of the kick panel fuse box the EGI fuse does not blow.

 

1. hopefully someone can verify but pulling the fuse above the dead petal interrupts the circuit draw connected to EGI...so ti won't blow

2. EGI relay removed and you do the same thing.

EGI is direct connect to battery so should be getting 12v constant. Key on IGN allows current through fuse above kick panel, EGI relay, and actual EGI fuse.

so condition one would indicate wiring from ign switch to fuse above deadpedal is ok.

condition 2 would suggest wiring from ign switch to dead pedal fuse to EGI relay is ok.

so problem is after relay activates and draws the power. EGI relay activates with power on at B/LG which allows current flow from EGI W/G wire off connector X-01

through relay, through B1-02 connector to wires B/O---->B/Y--->injectors
through relay, through B1-02 connector to wires B/W--->diagnostic module, airpump relay, PCM, Solenoids circuits


confused...me too...I would start checking wires off EGI relay to injectors...and proceed from there.

It only takes a little knick to short to ground....good luck and keep posting and I'll help as able.

Electrical gurus need to chime in!!!

 

check your EGI relay itself too.

 

Your problem won't be in the 15A engine fuse circuit, that just provides power to energize the egi relay. And it is not going to be a short to ground from the egi relay to the egi fuse, if that were the case the fuse would blow as soon as you put it in. Did you do anything with the air pump relay by chance?

 

You are right it wasn't in the 15A fuse circuit as I pulled the wires tonight to look at them.

I did not do anything with the air pump relay. Right now I have the entire main body harness unloomed looking for where I might have a problem. I have traced every wire from the EGI relay and every wire from the EGI Fuse and haven't come up with anything.

My main engine harness is removed and so is my coil pack harness so I know it has nothing to do with those.

 

try removing your air pump relay and see what happens

 

Ok, well I feel like an idiot. Turns out someone had tapped into the black and white power wire at B1-01. When I pulled the dash and main body harness I had no idea what this wire was and grounded it like a fool.

Thanks for all of those who helped.

 

Cool Story Bro

 

lol, moral of the story: don't ground out any random hanging wires, check.

 

Thanks voskbro

 

Glad you figured it out!

 

LOL...it always ends up being something simple...in this case, you made your own short to ground.