[s-cars] S6 starting problem - ECU fuse

Rich Beebe rich at beebecomm.com
Thu May 19 19:32:48 EDT 2005


From: "Mark Strangways" <Strangconst at rogers.com>

> If it is blowing with out having the ignition on, man I am thinking smoked
> ECU..

really??? <sigh>

consensus on this?
 
> But they can be fixed.

first, how would i determine if it's a fried ECU (no spare available)?

second, who would be a recommended company to work with?

thanks again guys.

rich

> ----- Original Message -----
> From: "Rich Beebe" <rich at beebecomm.com>
> To: "James Murray (QA/EMC)" <james.murray at ericsson.com>; "Bill Mahoney"
> <wmahoney at disk.com>; "'Krasusky Paul (WQQ2PXK)'" <WQQ2PXK at ups.com>
> Cc: "audi s-cars list" <s-car-list at audifans.com>
> Sent: Thursday, May 19, 2005 7:18 PM
> Subject: Re: [s-cars] S6 starting problem - ECU fuse
> 
> 
>> actually, it's blowing the fuses without even starting the car,
>> just by connecting the battery.
>> 
>> i wonder if it would help to disconnect the POSs and attempt the
>> fuse again? i've already checked the coil wires for a short and
>> the ground - all seem fine. i'm gonna need more 5 amp fuses.
>> 
>> i thought for sure, when i saw a blown ECU fuse, that it blew
>> because of the jump-starting. now, when it blows a fuse every
>> time the battery is hooked up, i can't believe it's something
>> else - knowing it was running just the other day with nothing
>> different. so strange.
>> 
>> rich
>> 
>> From: "James Murray (QA/EMC)" <james.murray at ericsson.com>
>> 
>>> Rich, this helps...
>>> 
>>> I'm assuming the fuse to the ECU blows only when you try to start the car
>>> and
>>> not when the ignition is off and you reconnect the negative to the
>>> battery?
>>> 
>>> This could be a failing POS (Power Output Stage) device... mine failed on
>>> me
>>> last year out of the blue (but I later found out I had a coil that was
>>> also
>>> failing, so I'm unsure if the failing coil caused the POS channel to
>>> degrade
>>> and fail), anyway you could have a channel in your POS that has grounded
>>> and
>>> failed... or even a coil that has failed.
>>> 
>>> Try this test: unplug both POS, insert new fuse, try starting the car (of
>>> course it won't start but you want to see if the fuse will blow), then
>>> plug in
>>> one POS (repeat test), then plug in the other (repeat test). If the fuse
>>> blows
>>> with either POS connected the it's likely the POS or a coil that has
>>> grounded...
>>> 
>>> Here's a good way to test the POS individually:
>>> http://forums.audiworld.com/a4/msgs/1594531.phtml
>>> 
>>> Cheers, /Jamu.
>>> 
>>> -----Original Message-----
>>> From: s-car-list-bounces at audifans.com
>>> [mailto:s-car-list-bounces at audifans.com]
>>> Sent: Thursday, May 19, 2005 4:12 PM
>>> To: Bill Mahoney; 'Krasusky Paul (WQQ2PXK)'
>>> Cc: audi s-cars list
>>> Subject: [s-cars] S6 starting problem - ECU fuse
>>> 
>>> 
>>> bill (and s-car list),
>>> 
>>> i have checked the 5 amp ECU fuse and i finally found a blown fuse,
>>> which i was hoping was a good sign. i unhooked the neg. battery
>>> cable, inserted a new 5 amp fuse, but once i reconnect the neg.
>>> terminal, it blows the fuse immediately. i'm unaware of anything
>>> i might have done to cause this situation. most of the work was
>>> routine (including CV boot, tie rod end, new stromung exhaust,
>>> pads, rotors, hoses...), but i also fabbed up a CAI. the MAF is
>>> hooked up fine and nothing else seems problematic. any thoughts
>>> on what might be blowing the 5 amp ECU fuse? honestly, i'm at
>>> a lose.
>>> 
>>> thanks again for any help.
>>> 
>>> rich
>>> _______________________________________________
>>> S-CAR-List mailing list
>>> S-CAR-List at audifans.com
>>> http://www.audifans.com/mailman/listinfo/s-car-list
>>> 
>> 
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> 
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