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Old 10-06-2011, 11:14 AM   #1
Oi_Oi_M8
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Default SBF#5 30A fuse blowing ... Help !!!

Hi All,

I have an interesting issue with my 06 STI Ö


Car stopped dead the other evening pulling into a gas station (close to home), plugged in accessport only to find I have no power to the OBD2 link connector and with that I got the car towed home. The following day after reading up on the forums what could cause no OBD2 link to accessport I found that fuse SBF #5 under the hood had blown which controls the ECM, fuel pump relay, main relay, drive by wire relay and OBD2 link connector. This was replaced with a fresh fuse. Before trying to start I had power to the accessport and checked for error codes which there were none.
The car fired right up with no issues so I left it running for about 10mins before taking the car for a test drive around my block. I got as far as the end of my block before the car died and sure enough SBF fuse #5 had indeed popped once again.

After pushing the car home and reading what could cause this I went ahead and did the following:

1) Disconnected fuel pump from rear of car.
2) Removed both 02 sensors pre & after cat.
3) Disconnected Fuel pump relay (passenger footwell)
4) Disconnected Main relay (passenger footwell)
5) Disconnected Drive by wire relay (passenger footwell)
6) Disconnected ECM

If I now plug in the main relay and turn the ignition to ON the fuse does not blow. However, if
I then plug in the ECM and then turn the ignition to ON the fuse blows. And thatís with everything else listed above disconnected apart from the main relay and ECM.
I have removed and inspected the ECM and do not see any leaking resistors or burn marks on the ECM board so guessing at this point that the ECM is fine and I have a short somewhere that is blowing the fuse but where I have no idea???
I am at a total loss and not sure what to try next. There are similar issues that I have researched and read on this fuse blowing and main relay issue but Iím not sure what to try next.

Any help would be greatly appreciated!

Thanks.
Oi Oi M8
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Old 10-06-2011, 11:27 AM   #2
Cali04sti
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Hi all, I'm having the same problem. Car worked fine, it rained last night and when I get in my car it started fine then blew sbf fuse 5 on my 04 STI. I didn't see any water leaks, looked at ECU and it looked fine. Replaced SBF fuse 5 with SBF fuse 6 for windows and it blew instantly along with SBF fuse 8 in engine fuse box. Sao now fuse 5,6, and 8 a blown, going to get more fuses now, can't find what SBf fuse 8 is for, it's also a 30A. Any info would be appreciated. Thanks in advance.
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Old 10-06-2011, 07:41 PM   #3
Oi_Oi_M8
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Anybody else have this issue or in the past?
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Old 10-07-2011, 11:36 AM   #4
Cougar4
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Just because you don't see any physical damage to the ECU it doesn't mean all is well with it. Since you state that plugging it in causes the fuse to blow it means the trouble is with it sorry to say. They can be expensive to replace. I suggest you see if you can find a used replacement from a salvage yard. If you can't find one that way there are places you can order repaired units from, at a lot less cost than a new one.

Good job on locating the trouble spot.
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Old 10-07-2011, 11:56 AM   #5
Cougar4
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Quote:
Originally Posted by Cali04sti View Post
Hi all, I'm having the same problem. Car worked fine, it rained last night and when I get in my car it started fine then blew sbf fuse 5 on my 04 STI. I didn't see any water leaks, looked at ECU and it looked fine. Replaced SBF fuse 5 with SBF fuse 6 for windows and it blew instantly along with SBF fuse 8 in engine fuse box. Sao now fuse 5,6, and 8 a blown, going to get more fuses now, can't find what SBf fuse 8 is for, it's also a 30A. Any info would be appreciated. Thanks in advance.
Check to see if a wire harness has come in contact with the exhaust system somehow and burned it. You may also have a rodent problem. If that doesn't show up anything then you could try disconnecting the things the other poster did and then reconnect things one at a time in order to find the problem.

I had never really noticed SBF-8 even exsisted before in the past. It supplies power to the ABS control module.
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Old 10-07-2011, 12:21 PM   #6
klarowe
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It may not necessarily be the ECM. If there is a sensor or device of some sort shorted out the full circuit may not be made until after the ECM is connected... making it appear that it is the ECM. I would try to get a pin-out of the ECM and start checking for grounded out pins.
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Old 10-13-2011, 12:59 AM   #7
Cali04sti
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I replaced the fuses and disconnected my ECU fuse didn't blow. Then I started connecting my wiring harness and checking with each connector. I found that when I connect the top wiring harness connector, (top being if your looking at the ECU when it is still bolted in...). It only blows when that connector and only that connector is attached to the ECU, if that is the only one unplugged it doesn't blow fuse #5... I'm looking for the pinout of a 04 STi ECU right now, than I'll check for continuity to ground on every pin on that connector, but having a diagram would be much easier..
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Old 10-13-2011, 01:35 AM   #8
Cali04sti
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The connector is B137 on the ECU..
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Old 10-15-2011, 11:00 AM   #9
Cougar4
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I think the trouble is most likely inside the ECU. I suggest you try to find a good used one from a salvage yard for a reasonable price and see if that fixes the trouble.
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Old 10-15-2011, 09:17 PM   #10
steverw25
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hey i have an idea you can check out if you like. ive had this same problem happen with my 00 rs and my buddies 02 wrx. subaru likes to run the downstream o2 sensor above the trans subframe with lots of slack and secure it with a push clip. id look and see if it has rubbed anywhere ,along the length of the harness side of the connector, and the trans subframe. mine had fallen and rubbed through the insulation to ground out a couple of the wires. on my friends wrx it had actually caught between the subframe and the trans mount. after repairing the wires and replacing the fuse all was good. then on a road trip in the wrx the a/f sensor(that had alot of slack), had fallen down against his headers and melted the insulation, grounding out the wires. fuel pump shorted out i guess before the fuse went out. that was a bad day. but anyway, take a good look at those o2 sensors wires. thats from my experience anyway. definitally better than having to replace the ecu first, then find it. those wires that the downstream sensor plug to are especially vulnerable because of how much excess can hang down if that plastic push pin breaks.. good luck with it.
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Old 10-25-2011, 10:19 PM   #11
Cali04sti
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Thank you very much for your O2 suggestion. I recently (like 4 months ago) replaced my up stream O2 sensor with a Bosche wideband from Autozone. There is no physical damage to the sensor or wires but sure enough that's what was popping my fuse #5. Glad it's not the computer. Thanks everyone and I look forward to contributing more to the forums.
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Old 10-27-2011, 08:57 PM   #12
Oi_Oi_M8
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I have since taken the car into a local shop (Subaru Specialist) to look at it as work has been busy for me lately and with that I have not had the time to pursue the issue further. I will however post any updates when the issue gets resolved.
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Old 10-27-2011, 09:31 PM   #13
DrD
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There are a lot of systems on that connector:

electronic throttle control and relay
fuel pump control module and relay
main relay
rear oxygen sensor
ps oil pressure switch
auto ac control module
immobilizer control module
tail and illumination relay
rear defogger relay
body integrated module

Good luck! There are also a bunch of grounds going through that connector. It's out of your hands now, but I would look over the connector and see if any of the pins look discolored to try and narrow it down - otherwise, it's a bug hunt!
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Old 06-02-2012, 12:57 AM   #14
tuzzio
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Did this ever get resolved? I'm having the same problem!
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Old 10-20-2012, 11:31 PM   #15
VVagonFTW
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having this issues also. i was able to drive but now its bad enough that it blows sbf5 as soon as i try to start the car
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Old 10-20-2012, 11:52 PM   #16
xhengmanx
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I had an issue with this before and found that my man sensor was shorted/open wire making contact to body ground. Fix the short and replaced the fuse and all was good.
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