catons scooby

just wanted to know how it could happen cos i think it just blew
cheers

magicgreg

I've blown one before in my Civic Type R by wiring some things up very wrong, cost me a fookin fortune to put everything right!

G

catons scooby

how did it blow

catons scooby

as the car was fine when i stoped then switched ignition on next day and the ecu has blown a couple of the capacitors within it any seen this before

cheers

magicgreg

All hell broke loose on the dash as every light lit up saying that basically I had fooked everything that runs back to the ECU, which is a lot!

Car wouldn't start and not a lot would work really, this is what happens when you let 12v go into the wrong wire haha!!

G

catons scooby

so did this happen out the blue or did it happen when you crossed the wire over and turn the ignition on,
ie rewired the stereo, then next time ignition was switched on the ecu blew?

catons scooby

any1 else

satancom

My ex has probably blown an ECU, she used to blow everything else she could get her hands on...

Harsh but true

20withascooby

lol satancom thats a gud one she aint blowne me tho m8 so at least u can put me bk on ur xmas card list

amego

sl1000

did they happen to be the capacitors around the IAC valve drive circuit? I know they are subjected to high transients due to inductance of the stepper motor. this can short out these capacitors.

catons scooby

i have a photo of the damage, not sure about the position awaiting an answer on this

sl1000

post the photo so we can take a look.

fbladerrv900

LOL

Yeah i think she sorted me out a few times..

catons scooby

sl1000

those are T-filters you burned out.
Only way to destroy those are by to much current.
So I expect that you have a shortcircuit somewhere which caused this.
check all wiring to sensors and such for short circuit

BTW What year ECU is that, it ain't equal to mine MY99 ecu

Shark Man

Blown an ECU on a Corsa once.

...tip: never put 12volts to a 5volt CAN bus interface wire (last wiring diagram I'll ever trust)

Result, one new PCM..which is blank, as are all Vauxhall units (indentical unit is used in most of their cars regardless of model), so had to be reflashed at thr mercy of the dealers

(even if the CANbus interface specifications state that interface should be able to take a maximum limit of 16volts...obviously not in this case )

satancom

Ok your back on my xmas card list heheh

I managed to fry my parents honda accord wiring loom once.. And that was being careless with 12v supply to a radio. Did all sorts of wierd things, like if you put the sidelights on the ignition would come on. Certainly sounds like its short circuit related!

catons scooby

its a new GEMS ECU, how you mean short circuit, ie a cable has come out of a connector and touched down to earth, but i thought if this was the case the fuse would blow?
cheers

satancom

Your short could be further up the wiring loom, say for example the wire crossed with the cigar lighter live.. Thats on a 30 amp fuse usually so your ECU would fry long before the fuse popped.

Just think, the wiring from the ECU goes all over the car, it could be anything..

Im not saying it is a short.. but most equipment thats fried that baddly has had way too much current through it.

sl1000

sometimes the wiring on the printed boards will be burned out earlier than the fuse of the car.
by looking at the picture you most likely have a problem with something connected to most left connector.
Try trace back to which connector pin the burned out components are connected.
on this connector is wired:
IAC valve
AC relay
fan's
pressure sensor and switch
ignition control
fuel injectors.

check all wiring from ecu to these components. Maybe you worked on one of them recently or near them.

catons scooby

well its still in a garage where its just had the 2.5 rebuild in so could be anything
the thing is it just went, it had the base map done then was waiting for a dyno, started up then fried,
i cant see the cigar lighter cable going down to the ecu if it hasnt been touched as the company are blaming me even though i havent touched the car, its been in there hands from the start,
the comapny are the nuts they know there stuff so i aint bad mouthing them just a glitch in the pipe line
all help needed thanks
mark.

sl1000

I think satancom ment as an example that it could be cross wired with the cigar lighter cable.
I would expect it to be a short to ground of one of the wires to the components I mentioned. Especially since it has been rebuild.
I think the garage people damaged a wire somewhere during the build and it has shorted to ground resulting in the damaged ECU.

satancom

Yeah sorry was meant as an example as it typically has a very high rated fuse!

I would look at the list SL1000 has given you and check for any obvious damage to the wiring loom in these areas!

catons scooby

i no just garage told me that its the stereo but i think they guessing just lighter near syereo so i thought id might be but dont see it

well i would say its a sensor thats short circuited aswell seemd logical

cheers ppl
more help or different possibilities would be good aswell