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Technical ASR Failure Loose Connection [ECU defective?]

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Technical ASR Failure Loose Connection [ECU defective?]

Re: ECU Failure Stilo

Most Easterly Pandas said:
Wheres all this located? Behind dash or in engine bay :confused:

Must take half a day to get to the bits :p
Click to expand...
Body Computer is at same location as EOBD connector and I sure wouldn't recommend playing with it. :p

Best to think of it, in very simple terms, as like human DNA as it holds a blueprint of the car as it came out of the factory.

Try to add or remove nodes on the car and it makes quite a fuss. Obviously it can handle failure of non-critical systems but the basic concept is that these will always be repaired. The real problems come when you try to add a node (as say an upgrade). The recognized way of doing this is to hide it from the BC (normally by delay circuits) but this only leads to the problem that it's now no longer 'seen' by any other system.

BC is most difficult to replace as you have to request an exact copy of the original from Fiat. I even tried to order a copy of mine but with the alarm module included - but was refused :(

As has already been said engine ECU must be blank to be accepted by BC and also MUST be the correct one.

That's the key reason you can't put a bigger engine in a Stilo even if it might fit mechanically perfectly.
 
Re: ECU Failure Stilo

12[X] said:
yep more likely to be a bad connection at d4 or crank/cam (or even ECU) and a battery on its way out (probably just be the battery..)

body ECU cannot be recoded (must be ordered specifically for your vehicle from fiat)
Engine ECU will code itself to the vehicle on first connect (after first coding it locks.. write once sort of thing.. so if it was plugged into another stilo before they sold it - you can't use it)

good luck dude
Click to expand...

Where is d4 please and connection at crank/cam ?
I replaced battery 2/3 weeks ago
I am replacing the engine ecu with brand new
thanks
 
Loose connection troubles

Having trouble with my 1.6 Active,

If I drive over 5 miles and try to start the car it won't start and I get the faults
Faults: LOOSE CONNECTION = ABS (sometimes), but mostly ASR, CAR SECURITY.
And after and hour or so, it starts up again.

Car is turning over for while when it does start (more often than not).
When it turns i mostly have to put on a little gas to fire it up.

Called the AA out, it turned over quite a bit but started straight away... said he couldn't hook it up to their diagnostic machine as the car started and they wouldn't be able to read the fault???
They suggested it could be the chip in the key fob, only got 1 with the car so can't test that out without it becoming expensive.

thanks
 
Re: Loose connection troubles

Battery on its way out, maybe?
 
Re: Loose connection troubles

JayEm said:
Battery on its way out, maybe?
Click to expand...

brand new battery.

having a look at pricing for crank sensor got qouted bout 70 supplied and fitted, just dont wanna change it and it be something else
 
Re: Loose connection troubles

try cleaning junction connections under battery terminal (you will find an excellent guide in the guides section) this may solve your issues.

Security failure is more likely to be related to barrel antenna (use search). Having said that - what troubles me is the fact that you never get a security failure when cold? This would seem to indicate that whatever the reason is – it is related to the car heating up (possibilities are endless.. but a loose connection is most likely). If you do get a security failure (e.g. subsystem or no code to immobiliser..) car will not start. Also try unplugging and plugging back in all the connections to ECU and body computer (use search again).

After you do all the above – get back to us

PS: even if the car starts there may be a record of error codes (or freeze frame data) so if all else fails – book it in at a local with a fiat examiner - investigation charge is about £35 for half hour – and given they’ve some experience with stilos (do not give em your car otherwise) they should be able to pin it down quickly (unless this is connection related.. so, regardless of what you do, give junction connections under battery terminal a dive)
 
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Re: Loose connection troubles

12[X] said:
try cleaning junction connections under battery terminal (you will find an excellent guide in the guides section) this may solve your issues.

Security failure is more likely to be related to barrel antenna (use search). Having said that - what troubles me is the fact that you never get a security failure when cold? This would seem to indicate that whatever the reason is – it is related to the car heating up (possibilities are endless.. but a loose connection is most likely). If you do get a security failure (e.g. subsystem or no code to immobiliser..) car will not start. Also try unplugging and plugging back in all the connections to ECU and body computer (use search again).

After you do all the above – get back to us

PS: even if the car starts there may be a record of error codes (or freeze frame data) so if all else fails – book it in at a local with a fiat examiner - investigation charge is about £35 for half hour – and given they’ve some experience with stilos (do not give em your car otherwise) they should be able to pin it down quickly (unless this is connection related.. so, regardless of what you do, give junction connections under battery terminal a dive)
Click to expand...





I have cleaned all the junction connections under battery terminal, first time i tried to start car, (from cold too) it didnt start, 2nd and 3rd times it started. (this was last night)

So today tried the car, turned once, tried again then it started. (seems to be the case nowadays)
Took it to a garage this morning, the first bloke i spoke to said it very much sounds like a crank sensor, but i would need to take it to there other depot for a diagnostics check,
took it there (£30 later) comes back with these codes

P0460 - Fuel level sensor
P0571 - Cruise Control A switch

The bloke that did the diog said could well be the fuel level sensor, not letting fuel through to start.

The spoke to there manager, then he said, it wont be the Fuel Level Sensor. didnt seem right to him, he said.
Then he dropped the bombshell and said it would more than likely be the ECU, as 90% of stilo electrical problems are faulty ECU.

All in all, when my car doesnt start it doesnt come up with either of those faults i was diagnosed with,
it always says car security, ASR.
So really dont know what to think from all this.

any suggestions?

thanks guys
 
Re: Loose connection troubles

For £30 you could have bought your own Code Reader (eBay).

I gather that most ECUs are changed due to connection issues i.e. the ECU is really OK.

I'd put some effort into checking all contacts are really good - and get that code reader.
 
Re: Loose connection troubles

fuel level sensor might have an input in allowing the car to decide if/when to allow fuel vapour to enter the engine (although this should not happen until engine warms up.. but as the pump/sensor are one unit – perhaps problem with one also affects the other e.g. due to a bad contact both the pump and sensor loose power – you may want to clean all wired connections there..) as a result i don't see how it would affect your car starting. Cam sensor may cause your problem but it would also be logged as a fault.. To me - the fact that you get asr and security failure still indicates a problem with wiring somewhere (as these are two very separate systems) although asr is not crucial it may be worth looking into (might be a short somewhere). A security failure would however stop the car from starting but that may not be necessarily related to the BC or ECCU - it could be your key or even a receiver antenna in key barrel. Last but not least - to the best of my knowledge - it is very rare for stilo ECUs or BC to fail (security faults would probably relate to BC) although fiat procedures specify a replacement almost as part of the diagnose procedure.. and most of the time it does help (shiny new pins = good connection) but i'd still advise you have a good look and clean all connections (not just in battery fuse box.. also clean and reconnect ECU and BC plugs). Apart for this.. i'm out of ideas - perhaps some one more knowledgeable could guide you further
 
Re: Loose connection troubles

Thanks for the tips. Haven't bought the diagnostic yet.

Checked and cleaned a few more connections.

AA called out again! Cut out in the middle of town, first time this has happened.!
Said it could possibly be a few things, loose wiring, chip in the key fob or the immobiliser unit on the car.
He hooked it up to his diagnostic and got possible wire connection fault with the gear box, he jacked the car up and tightened a few bits. He also checked a few of the earth points under the bonnet and the car started(y)

He said it could run for a few days or a few months... if only
Drove it home, juddering slightly. Started it a few times on the drive at home fired up first time everytime, so I decided to take it back out.
Not a great idea, went in the shop came back out tried to start it up and same old thing...asr/ car security, car refusing to start.:eek:

Left it where it was for the night, been to collect it this morning and it started 2nd time:bang::bang::bang:

Going to go over the wiring again, as it started when the AA man did.

I'm no mechanic and my patience has almost run out...
There could possibly be a Stilo for sale later on today, anyone looking to buy!!!
 
stilo 1.6 asr failure/loose connection problems

Hi can anyone help, my 1.6 stilo keeps cutting out, it has had a brand new heavy duty battery fitted on saturday today it cut out again!:bang: its displaying asr failure loose connection on the dash, also for the past few weeks it displays airbag failure, thought all these problems would be resolved after replacing the battery but no!! any ideas as to what this problem could be? much appreciated
 
Re: stilo 1.6 asr failure/loose connection problems

Since it's not the battery then it's almost certainly a bad earth somewhere.

Use Search and you'll find lot of info on that topic (also look in Guides/FAQ)
 
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