Right,was driving my car today and the big think amp lead was connected to the battery but not the amp.Therefore had a live wire in the car.This then earthed and the car cutout ,no ignition.Phoned R.A.C and he came out disconnected the lead from the battery,but it still wouldn,t start.He said it has fucked up my E.C.U....I thought he was talking bollox,but it still won,t start

 

Check all your fuses and the fused wire at battery, tbh you are lucky you still have a car..

 

fuck knows mate,,,,,,,,,,,doubt he can tell either unless he takes the ecu apart and tests it


could have burnt out the loom,,,,,,,,, fired the starter,,,,,,,,,, hel theres loads of things it could be


if its a MFI erst you got then its more likley a breather hosue is undone

infact i think the ecu has a 1 way resistor in it to prevent negative frying , not to mention that live against live wont go untill the igniton is turned off and the switched live goes negative

 

He is talking sh*t.


More likely to have blown a fuse as said above or another earth wire
elsewhere on the car.


As an aside, I dont think most patrol men are "clued up".

I used to work for a company that supplied RAC with diagnostics testers.
They had a RED and BLACK wires for connection to the vehicle battery
and labels on the coloured wires saying positive/negative.,
Nearly had 50% of them returned for damage caused by connecting them
up backwards.

Thick cnuts

 

As Damo say's I have had the misfortune of a Batt moving under the bonnet of an old S1 I had burnt out every fecking earth but E.C.U. survived

And to be honest I contract for the RAC and if they aint got a clue which most have not its always the E.C.U. Thats at fault prob popped fuse or burnt out earth !.


Regards Doug .

 

Just pipped me to the post Simon

R.A.C. = Ring A CUNT or Rent A Clown




Regards Doug .

 

on a side note i have fried a ecu though simply connecting jumpleads without a surge protector, so don't go thinking ecu's are indestructable!

 

why didnt you fit a brdge rectifyer on the supply circuit then

 

yeah but you doubles the volts/amps to fry it

you never shorted the live to the neg

 

cause he would have lost 80% of his work and also had more waranty claims rather than proof of bad workmanship i guess

 

Thanks guys,also because i was on TRADE PLATES,(no tax,) He wouldn,t tow me home.Had to get my bro to get me out the shit.Cheers R.A.C.

 

My old Orion caught Fire behind the dash and i got it put out with a bottol of coke

Got it recovered home and was to;d it needed a new Loom and yes it did as half the wire behind the dash had melted togher ,

My E/W Ect would go up as they had no power it turned out the wire that goes from the Fuse box to the Battery had melted and snapped off @ the battery end it goes from Thick to a smaller wire

So if you got nothing then look there m8

 

Ok here goes....

The power input positive was protected by a series diode to prevent
power reverse polairty which in its own right works fine.
A bridge rectifier could NOT be used as this would raise the ground voltage
level with respect to the vehicle earth about 0.5 volts higher and this
would affect comms signal quality and switching reference levels up.

The problem comes when the lead connecting the tester to the car
diagnostic socket has its own ground in the lead.

So, when the tester is plugged in to the car its own earth is correct.
Then when you connect the GROUND battery lead accidently to positive,
this created a short circuit across the battery - BANG.

The unit was protected with a fusable resistor in the comms lead ground
connection which is designed to blow in such circumstances to protect
from it from fire.

Hope that explains it.


mmm

 

simon i ment it as in them sending back stuff for warranty when they fucked em up by being dick heads rather than using it as a cheap dig against you

erning out of someone stupidity who should know better aint such a bad thing imo, just business



if i was gonna make sly digs at you i owuldnt have bought a S8 ecu would i,,,,,,,, that would be more idiotic than the colour blind rac men


not everyone is a enemy on here

 

b19bal,

Didnt know what you meant Old age, pananoia and no sleep in the
last 36 hours doesnt help.

 

SECS

i was teasing simon

 

 

Really ? - I thought is was a sensible question you asked there !

 

si i understand mate

 

i KNEW there was a reason why you hadnt doen so,,, but being honest i didnt know what it was if you used silcon diodes for the bridge wouldnt that lower the ground difference

 

Gareth,

On some of the communications data links, even a 0.2 volt difference
did cause issues on the design.
There are ways around it like you have mentioned but there were other
issues why this had to be a direct link.

I did suggest a fitting a 2 pole relay which only turns on when the power
was correct polarity but this was rejected for cost and space reasons.

 

cool simon

been ages since ive done some tidy electronic design,,,, i have promised myself to get back into it one day and learn more about digital electronics and not just the passive shite

 

Just pipped me to the post Simon

R.A.C. = Ring A CUNT or Rent A Clown




Regards Doug .[/quote]


Bugger! I just paid 80quid to be a member!
lol TBH i would only want them to sling it on a truck though
(not that i actually own a car at the mo )

 

Bugger! I just paid 80quid to be a member!
lol TBH i would only want them to sling it on a truck though
(not that i actually own a car at the mo )[/quote]



To be fair im a member also

But only as it was the cheapest quoted recovery for any long distance

Local is sorted as i work for a Recovery firm but some of the jobs you get Via the RAC is funny as Feck




Regards Doug .

 

GARETH T,

I hate analog/passive electronics - It can be so random sometimes

Its all going to be truly digital one day.

Look at most comercial electronics now. More silicon and less carbon !

You can already get single chip PC's


"Ring A Cnut " PMSL @ Doug

 

@ simon

Regardless of what some idiots on here say I still stand by you and think you a very knoledgable person and one that know's his electronics shit

Hat off to ya mate



Regards Doug .

 

most of my circuits have a little randomness too them

 

Regardless of what some idiots on here say I still stand by you and think you a very knoledgable person and one that know's his electronics shit

Hat off to ya mate



Regards Doug .[/quote]

And i will second that

 

Doug, Costina,

Thanks for that

I am sticking to designing only from now on and letting others do the hard
work.

I finish my current full time employment end of this month as I was
on long term contact work but now have a new venture !
(its a secret for now - so that others dont ruin it before its had a chance)

 

Went over the car today after work,couldn,t be bothered last night as the R.A.C man had prepared me for the worst.Anyway turns out a use had popped in of all places(THE FUSE BOX).Thank you R.A.C.

 

more like


rescue a cabbage

 

Are you calling me a CABBAGE?

 

no .. do you think you are

 

 

Must be some sort of vegetable to lisen to the R.A.C

 

fpmsl

 

Simon - you get a lot of shit posted about on this website, and none of that is any of my business so I shall stay out of it....

But fuck me fella - you're a bit fooking intelligent!!!!!

Not that I understood any of that up there, but shit, you seem to know your stuff pal

 

Thanks I do have my uses sometimes