hi, i recently installed some subs in my car about 2 months ago with absolutely no problem. now all the sudden my ecu fuse keeps blowing. i have a 2001 hyundai accent 1.5l. i installed :

iraggi 200a alt

kinetic 1400 in the back (still got original in the front)

0ga wiring

memphis 4kw

2-re sx 18's

i've been reading online and some have suggested faulty oem wiring and other various conponents (sensors, injectors, ect..). so far what i've seen in my car is this.

about a week ago i was driving back to work from lunch (18's bangin') and when i took a left turn the car died and would not start back up(starter turns over but engine won't run). i pulled over and within about 15 minutes i found the 20a ecu fuse under the hood was blown so i took the 30a head light fuse and put it in the 20a ecu location, the car drove back to work and home no problem. so i didn't drive the car anymore. i didn't have time to mess with it for a few days so i later bought a new 20a fuse for the ecu and put both the fuses in their correct location. after that i drove the car down the hwy and banged the shiznit outa the 18's no problem. later that same day i had my girl with me and she don't like the LOUD subs so i didn't even have em on, we went about ten miles down the hwy to a store with no problem. but when we left we took a left turn back on the hwy and bam!!! it blows again so i pull over and instantly swap the fuses as i did before. but now as soon as i try to crank the car the fuse blows everytime.

with the key off and the ecu fuse out i put my meter on the 2 fuse terminals and it reads 11.34v. to the best of my knowledge there should'nt be any voltage in the fuse box between 2 terminals. so i found 2 wires comming off this fuse (1-14ga red, 1-18ga orange/black). the orange/black wire has the short. i followed the wire straight to the ecu when its plugged into the ecu the short is present when i unplug it the short is gone.

do ya'll have any suggestions?

looks like you need a new ECU.

Yeah, I was thinking that also. You may have fried it with undervoltage. Amplifiers aren't the only casualties of war when voltage dips too low in the car.

Amplifiers aren't the only casualties of war when voltage dips too low in the car.

all too true!

Get your hands on a fsm for you car and figure out what the wires do, and when they have power and why. There is a very good chance that those terminals are supposed to have voltage in a key off situation. The fact that you say this occurs during a left turn leaves me to believe that you have a bare wire grounding on your chassis somewhere. 11.34 volts is low for resting voltage so there is a load.

Since you're blowing fuses on that circuit, either the ecm is shorted and causing a load or the orange/black wire is shorted.

Here's a few things I would do...

Unplug the Ecm. Get the wiring harness and put the dmm on the continuity setting. With no fuse being in the circuit, put one dmm prong on the orange/black at the ecm connector and ground the other dmm prong on the vehicle chassis. If there is continuity, then the wire is shorted and grounding out. If there is no continuity, then the ecm for one reason or another is pulling an obscene load on the circuit and causing it to blow fuses. Which would lead me to believe the ecm is bad or something that piggybacks power from the ecm is shorted.

I have ASE certifications and was a DC Electrician for a few years at a shipyard. So, I know a little about wiring. But, the FSM will tell you and teach you a lot more than I could even begin to know. Get your hands on one somehow

Edited June 3, 201015 yr by mr.sagat