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Old 05-04-2005, 09:31 AM   #1
attitude
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Default fuel pump not priming/ecu not on?

i was driving my car last night and it shut off. when i try to start it, the fuel pump wont prime, the utec doesn't have the lights on it either. my avc-r is tapped to the ecu wires, and it is getting power. i have a bad feeling that the utec or ecu are fried. anyone else have similar problems?

mods:
utec
tuner pro
all fuel mods
t-67
tgv delete
front mount
big maf
etc.
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Old 05-04-2005, 09:44 AM   #2
2phless
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First. Get power for the AVCr somewhere else. There are enough sources of 12v in the car that you don't need to be sharing one with the most important component in the car.

If you are lucky, one of the connections for the AVCr broke the circuit to the ECU. If not, try taking the UTEC out of the loop. It probably won't start with your mods, but you can listen for the fuel pump. Really lucky and it just wants a hard battery reset.
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Old 05-04-2005, 09:46 AM   #3
gusto
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checked all your fuses???
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Old 05-04-2005, 09:58 AM   #4
attitude
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going to check all fuses soon, i have to work until 5. and i unplugged the batt. and hit the brakes. no luck
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Old 05-04-2005, 07:28 PM   #5
attitude
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fuse sbf #5 under the hood keeps blowing. only when plug 187 on the ecu is plugged in. far right plug. think the fuel pump is grounding out in the tank?
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Old 05-04-2005, 08:21 PM   #6
03MBP
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Check the main relay, mine went on me a few weeks ago. Its the brown one under the glove compartment/kick panel.
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Old 05-05-2005, 12:15 AM   #7
wrxtuner02
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we actually found it to be the aforementioned fuse and it only blows when the 187 plug is in the ecu, there are quite a few grounds on that plug, one being teh rear O2. i guess well start tracing grounds tomorrow.
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Old 05-06-2005, 04:58 PM   #8
wrxtuner02
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well we think we found teh culprit. The pony express MIL eliminator was somehow grounding out and plowing the SBF fuse #5. simple solution, pull teh rear o2 and plug the hole. how imperative is teh rear o2 to the ecu? We have a UTEC and TUNA in teh car.
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Old 06-24-2005, 12:58 AM   #9
nate.the.great
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Quote:
Originally Posted by wrxtuner02
well we think we found teh culprit. The pony express MIL eliminator was somehow grounding out and plowing the SBF fuse #5. simple solution, pull teh rear o2 and plug the hole. how imperative is teh rear o2 to the ecu? We have a UTEC and TUNA in teh car.
I'm having the same problem, but I don't really understand your post. I have a PDE downpipe which has never given me a CEL. I also have a a/f ratio plugged into the rear O2 sensor (I just needed something to fill the other spot in my other a-pillar hole.) When my ECU gets hot from "spirited driving" my fuse blows.

Basically, the instructor was driving my car, my fuse blew, and my car died. We towed it and then I pulled the fuse and swapped in a new one (car was off), and that fuse blew right away. Then, I took my ECU cover off, let everything cool down, and put in a new fuse. It worked and I drove home. Any ideas on my culprit?

Last edited by nate.the.great; 07-26-2005 at 03:49 PM.
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Old 06-24-2005, 07:59 AM   #10
attitude
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no. this still hasn't fixed it. we still have no idea why this fuse is blowing.
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Old 05-06-2005, 05:01 PM   #11
dwx
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Rear O2 is only there for emissions.
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Old 05-06-2005, 06:21 PM   #12
attitude
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hole will be plugged tomorrow
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Old 06-24-2005, 10:11 AM   #13
nate.the.great
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when does yoru fuse blow? is it under hard driving? i wonder if ecu heat has anything to do with it?
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Old 06-24-2005, 10:52 AM   #14
attitude
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i drove mine for about two miles, hit a bump, and blew the fuse.
i have since waited a day, then put a new fuse in it, and it blows right away.
it is 90+ degrees here, and its hot in the car.

i wonder if i removed the utec from the ecu, put it in the garage for a day, to allow for complete cooling, and tried it then...

but that wouldn't explain why they blow when i hit a bump, or stall it. mine seems like something is rubbing.
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Old 06-24-2005, 11:03 AM   #15
Jaxx
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wild suggestion:

check the gromits where the wires enter and leave the engine bay
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Old 06-24-2005, 12:00 PM   #16
attitude
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will do, although i have looked at them already. but not intensively
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Old 06-24-2005, 12:16 PM   #17
nate.the.great
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try this...

1. make sure your ecu is cool - (i have some wires wired into my ecu and i moved those apart to make sure they weren't touching each other)
2. unhook your battery
3. drain your power by hitting the brake
4. install the new fuse
5. plug in the battery

that worked for me. however, mine blew when my ecu was very hot AND we were in a turn. i wonder if the turn had anything to do with it. how weird... I wonder if that fuse blows when the ecu sees something weird (heat, etc...)

Also see this post. http://forums.nasioc.com/forums/showthread.php?t=521166 Maybe under extreme loads aka cornering or hitting bumps that wire underneat the rear seat gets pinched?
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