Shadeyman said:

AudiDynamic85 managed to get his Stilo to my place and we fitted a brand new battery(Varta). Car started first time, only error was the usual airbag error.

Car was ticking over perfectly for about 2 minutes, then the engine stopped, errors popped up all over the place.

Eventually got FiatECUScan configured on my spare laptop and scanned it. Only managed to find ABS? Eveytime I've scanned before I've always got Engine, ABS and Power Steering.

So my question is

What problem could cause these symptons?

Could a bad earth prevent FiatECUScan connecting to the power steering and engine computers?

Click to expand...

And how thankful was I, thanks again tho Stu, I mentioned what a small world it is when I met Stu cus I remember driving past his previous Stilo 5 door.

It seems from the none read from FiatECUScan the RAC approved garage were bein truthful when they said their 7k equipment couldn't read either.

dave said:

check fuel cut off switch and fuses

Click to expand...

Cheers dave. Unfortunately I'm not very familiar with the petrol versions of the Stilo. What fuse and where? How do I check the fuel cut off?

Deckchair5 said:

Yes that's it. Bit of a pig to get onto. I disconnected air intake at filter box and then tucked it up out of the way and then used longest ring spanner and then another ring spanner connected to that and gave it a thump with a soft faced hammer

Immobiliser relies on ECU to C40 earth >to engine earth >to battery neg too

Click to expand...

Where's the ECU C40 earth?

Have a look in middle picture above
That's the ECU
C40 earth is the black wire going to the bottom left ECU mount bolt

If you have a jump cable try, with using just one of the cables, connecting engine directly to battery neg. That will eliminate the battery earth connection

(Fuel cut off would give warning on dashboard and if that had triggered then it wouldn't start at all with fuel pump cut off. Simply listen for fuel pump prime with first ign on then you know fuel cut off is ok)

Shadeyman said:

How do I check the fuel cut off?

Click to expand...

i dunno where it is on a stilo, but ff bus code light was on last week, pressed that button light went off an it started

Deckchair5 said:

Have a look in middle picture above
That's the ECU
C40 earth is the black wire going to the bottom left ECU mount bolt

If you have a jump cable try, with using just one of the cables, connecting engine directly to battery neg. That will eliminate the battery earth connection

Click to expand...

ECU earth and engine earth checked, both are good. Tried the jump cable trick from the engine to the battery negative, still getting the same errors.

Multimeter just give up on me. Was getting 60 volts while it was sittin on top of my toolbox ... lol

So we now have a good battery and good earths(engine, C40, C15) so whats next? Could fuses have blown? If so which ones?

Edit
Same problem, unfortunately no solution.
https://www.fiatforum.com/stilo/11905-loose-connection.html

Checked all the fuses under the bonnet earlier, still the same errors.

Just decided to check all the fuses by the drivers knee. Found one blown F44(20amp) so I replaced it. Car started with only the air bag warning again. Grabbed my laptop and as I got back to the car the engine stopped again with what sounded like a pop sound in the intake. Checked the F44 fuse and it was good, not blown.
Tried checking every fuse again to see if it would reset again, no joy.
I did notice an alternator failure error but its not there when check again after?

Shadeyman said:

How do I check the fuel cut off?

Click to expand...

It's right below the "turn off front airbag key function" on the inside. On my car (left hand driven) it's on the passenger's right ancle, so mirror that idea.

If your still having problems connecting then you may have a low battery. Try a charger on the battery whilst trying to connect the Scanner or disconnect any aftermarket electrical items from the battery.

I left the battery disconneted over night, didn't want any faults to drain it. Plus, I was hoping that when I reconnected it this morning the ECU would have reset and give me just enough time to connect FiatECUScan and get the error codes before it failed again.

Got everything ready, cable connected, laptop on running FiatECUScan, battery reconnected and the camera on my new mobile phone ready to take a photo to record the errors.

Success! (I love it when a plan comes together. lol)

Took a photo of the stored error codes 2 seconds before the connection failed(Ignition on engine not running).



Edit.
Just found this, tried his solution doesn't work.
https://www.fiatforum.com/stilo/218125-u1600-u1601-ecu-poor-contacts-2.html

Ha. Looks better than the average garage

So what do you reckon? Bottom three faults look like the big ones I'd go for first and show a lack of comms out of ECU
U1600 and U1601 No comms between ECU and BC
Throttle actuator -no signal= no comms between ECU and throttle body

All could be ECU losing earth supply
Even O2 sensor signal low could be ECU not putting voltage out

I'd try a direct connection like a jumper lead from ECU earth C40 to battery earth

Deckchair5 said:

Ha. Looks better than the average garage

So what do you reckon? Bottom three faults look like the big ones I'd go for first and show a lack of comms out of ECU
U1600 and U1601 No comms between ECU and BC
Throttle actuator -no signal= no comms between ECU and throttle body

All could be ECU losing earth supply
Even O2 sensor signal low could be ECU not putting voltage out

I'd try a direct connection like a jumper lead from ECU earth C40 to battery earth

Click to expand...

Already tried the jump lead trick, post 25.

Shadeyman said:

ECU earth and engine earth checked, both are good. Tried the jump cable trick from the engine to the battery negative, still getting the same errors.

Click to expand...

No joy.

Tried cleaning all the connections to the fuse board near the battery, including the D4 connetor.

No joy.

I'm suspecting a faulty ECU as it fails at exactly 27 seconds evey time, plus the clip on the ECU doesn't lock into place. Fuse board under the bonnet was loose out of its mounts, noticed when I cleaned it this morning. Its back in now.

Perhaps checking the connections on the body computer(where is it, near drivers knee?)? Any more suggestions?

Sorry, didnt see your post 25

Disconnect the pre cat O2 sensor. It has a reported problem (fatal) and it takes maybe 30secs to a min to start operating to go into closed loop. Keep the rpm up and see if it gets over the 27sec barrier




O2 sensor connector is real easy to get to, near the throttle body

BC is in the same place as your car, to the right of driver's knee

F44 blowing would be just a distraction as it's just cigar lighter socket

Car won't start.
Had to leave the battery disconnected all night just to get a 30 second window to connect FiatECUScan and get the error codes(post 28).

Deckchair5 said:

F44 blowing would be just a distraction as it's just cigar lighter socket

Click to expand...

Think custom fit ICE caused it.

Car started with only the air bag warning again.

I'm suspecting a faulty ECU as it fails at exactly 27 seconds evey time,

Sorry, i thought you meant car started then failed after 27 secs

Just for info, can lines from ECU go through D4 and then thru steering to get to BC
I'd try disconnecting and reconnecting BC plugs at rear of BC. Losing connection afer 27secs still sounds like thermal poor quality connection

Poor custom fit ICE can interupt CAN system

Deckchair5 said:

Just for info, can lines from ECU go through D4 and then thru steering to get to BC
I'd try disconnecting and reconnecting BC plugs at rear of BC. Losing connection afer 27secs still sounds like thermal poor quality connection

Click to expand...

Checked and clean D4 connector so body computer connections next.

"thermal poor quality connection" whats that?

What's that? Just losing contact as it warms up

Bad ICE fit will affect CAN system, interrupt immobiliser and cause flat battery as nodes don't go to sleep

Always disconnect any bodge mods first to eliminate them

Removed body computer and cleaned all the connections with electrical cleaner. Put it back together and got the same 30 seconds before the engine cut out. First fault to show on the dash was "Alternator Failure".

Deckchair5 said:

Bad ICE fit will affect CAN system, interrupt immobiliser and cause flat battery as nodes don't go to sleep

Always disconnect any bodge mods first to eliminate them

Click to expand...

Not sure I want to touch that?

Shadeyman said:

camera on my new mobile phone ready to take a photo to record the errors.

Click to expand...

Didnt think of print screen button then no

If you can let me know what aftermarket electronics are fitted, how and where im sure i can help.
Im having troubles with the head unit and the split charge relay switch being attached to the ignition and wired up wrong. Hopefully i can recreate the problem if i think his is wired how i guess it is?

Print Screen. :doh:

Thanks Stu, I'll take a look at his ICE later today and let you know.

If he has amps connected to the battery, even on power off these could pull sufficient amps to be making your connection fail. I had this problem when trying to remap my old stilo. Simply disconnect aftermarket cable from battery and that would solve the problem.

Im sure Decks could confirm if a low battery due to ICE could be throing up some of these faults and eliminate a few from the equation.

Eventually found the positive supplies to his ICE and disconnected them, no change, still an non starter with the same errors.

Deckchair5 said:

Disconnect the pre cat O2 sensor. It has a reported problem (fatal) and it takes maybe 30secs to a min to start operating to go into closed loop. Keep the rpm up and see if it gets over the 27sec barrier

Click to expand...

Going to give this a try if I can get it started again.