Hello there,

I have a Fiat Stilo with the awfull problem to cut out every time the fiat think like doing it. It wil cut out and give the errors like esp, abs, asr and "loose connection'. At the beginning the problem started ones in a week, later ones every day. I could start the engine again and the problem was gone. The problem now is that the car won't start, but after 5 - 15 minuts the car will start again. i did the free stuff first like checking al lthe connectors suchs as the D4 and al sensor connectors, i cleaned the air intake and checked other free stuff, but it wouldn't go away. Because i saw real problems i had bring the car to a Fiat dealerschip. They diagnosed a faulty battery and a faulty RPM sensor. But after 8 minuts of driving the car did exactly the same. They put the car on a examiner and the car throws out 10 fault codes, like:
P0460: fuel sensor; intermittent
U1600: Electronic key; intermittent
P0520: oil pressure switch;intermittent
P0571: Brake switch; intermittent
U1601: Fault line C Can;intermittent
P0606: Regelulator unit broken(microprocessor);intermittent
P0105: pressure sensor; intermittent
P0443: ?;intermittent
P0110: Outside temperature sensor;intermittent
P0230: ?;intermittent

The guys from fiat don't understand the faults, and after 10 hours of searching i gave up with them.

IWhat can cause the many faults the stilo throws up? there a solution, does anyone know what's up with the car?

Thank you on behalve of,

Samuel van Loon

try contact cleaner on the main ECU lines (top back of the engine if you are facing the engine bay) do the same for all the connections under the battery fuse box

The clue has got to be with every error being "intermittent"

Likely caused by power supply or poor earth at some point. An intermittent short would also cause the same errors.

Have the errors been cleared and then re-read ?

Thanks for the reply's. I already cleaned all connectors running around the engine, computer, fuse box, d4 all with real contactcleaner. All the contacts looked perfect, nice and clean. There is a new batterij installed, i don't know how well the garage checked the earth, could a bad or poor earth really be the problem? The car starts fine, that's a benchmark? How can there be a short, when nothing has changed in the cars circuit? could it be caused by something else? The fault codes were resetted but came back, should that make any diffrence? The garage did three test, all ending up with a cutting out stilo. They only gave me a examiner test from the last one, don't know if there was a diffrence between the first, second or thirth reading. I didnt do it since the car is back from the garage!

Could a sensor or bad computer give this readings?

How old is the stilo?

I'd try all the earth leads as these can corrode
check the voltage with a meter across the battery
terminals and then to the earth points any voltage
drop would indicate bad earths.

John

sixpotman said:

How old is the stilo?

I'd try all the earth leads as these can corrode
check the voltage with a meter across the battery
terminals and then to the earth points any voltage
drop would indicate bad earths.

John

Click to expand...

hi john i am not very technical ,so could you expand a bit
ie checking voltage across the battery,, what setting do i put the meter on and should the reading be the same as the battery rating

And then to the earth points ,,does this mean keeping the+of the meter on the battery pole whilst - is on an earth point cheers

Samuell1 said:

The guys from fiat don't understand the faults, and after 10 hours of searching i gave up with them.

Click to expand...

who did you acually speak to?

The car is investigated by a recommended Fiat Dealership in Holland. They told me that the Stilo is a nice car, but with intermittent problems it's really hard to find out the problem. In my opinion they are not up for the task, after 10 hours of searching surely they had to find something evident. After complaining yesterday about the bill, they offered to put back the old part, the battery and rpm sensor because clearly that wasn't the problem. The problem is the cutting out(lights and other electronics work perfect). And the problem to get is started again, sometimes waiting 10 - 15 minutes.

The car is a fiat stilo 1.6 16v dynamic 2002. They told me by the dealerschip that they put in the new software, but i don't really think that was a problem then or is a problem now.

Is there any chance that a faulty sensor could cause the car to do what it's doing? Can a car regonition system do something like this, or a faulty car key or the contact key give so many fault codes??

Ok there are 2 ways both with a multimeter

Voltage sometimes requires ignition to be on set the
MM (Multi Meter) to 20 volts DC put the red lead
onto the positive terminal and the black lead on the
negative terminal make a note of the voltage including
decimal point value. 12.65

Now keep the red lead in place on the battery and then
check the nut heads where the earth wires are fastened
to the body and engine also to bare metal on the engine
and body. If there is any difference in voltage then the
leads suspect.

Other way is resistance but to check that one end of the
lead needs to be unbolted on the smallest resistance setting
and the largest resistance setting on the MM you should get
0.00 if there is resistance then the leads suspect.

You have to bare in mind the car is 7 years old fiat electrics
are suspect at the best of time so any discolouration of the
copper leads from bright metal means the leads loose power.
The stilo does not like voltage drops and can throw many
faults out due to this. The other suspect lead is the one
positive from the alternator to the battery.

It's either going to be something expensive or something
very simple and cheap to fix. The battery leads are where
I'd check first, then check the alternators charging ok
you should be putting in 14.5 volts on the battery terminals
when the engines running.

John

https://www.fiatforum.com/stilo-guides/83260-cleaning-your-inlet-control-valve.html

This one has solved many...

@sixtporman, thanks i will check that one. It a quick and cheep test.

@morty mort, the inlet control valve i already cleaned it. I did a test to see if there were any faults registered wen i didn't let any air in de intake by holding a card for the intake. The car just dies, but no error registered. So that couldn't cause any errors right?

I ment who did you speak to at the garage...best talk to tech working on car.

Hi, this sounds as if the culprit is the crankcase sensor. Found on my Stilo 02 with the examiner pluged in during a test drive, but you say this one was changed? Same symptoms that I had.

I'd tend to agree with the above about the crankcase sensor.

Had one go on my SLK and caused the "cutting out and wait for ten mins and it will start" problem.

But then again.... who knows, could be the gibbet wheel sensor interfereing with the manual gum override adjuster.

gthomas said:

Hi, this sounds as if the culprit is the crankcase sensor. Found on my Stilo 02 with the examiner pluged in during a test drive, but you say this one was changed? Same symptoms that I had.

Click to expand...

bigfathairybiker said:

I'd tend to agree with the above about the crankcase sensor.

Click to expand...

already done (see opening post)

I reckon its ECU from info given

View attachment 70310For so many systems to be affected then I'd look for something that is part of all of those systems and that is the battery main earth line. If you haven't already done so then look here https://www.fiatforum.com/stilo-guides/163613-sorting-bad-battery-earth.html and do some voltage drop checks on the earth line.




Multimeter set to volts, engine running, heated rear screen and lights on
Test simply between the battery earth connector and a shiny metal part of the engine. Of course, it should be very near zero volts. Bad connection would be 0.1v or higher

Simply checking resistance measurement at either side of the earth point with engine off isn't so good as there's no electrical load at the connection

Your garage diagnosed a bad battery but a problem earth will give all the symptoms of a bad battery eg weak charging, poor starter motor power, lots of warnings and fault codes on many different systems due to their voltages below limits.

You say "They diagnosed a faulty battery and a faulty RPM sensor" but did they actually change the rpm sensor and check its operation afterwards?
What made the garage say a bad battery? Low charge voltage? Not holding charge? Weak starting power? People often change the battery when it's simply an earthing fault. It seems as if a new battery cures the problem (as the battery now has a good charge) but soon afterwards the faults reappear. The bad earth fault hasn't been corrected

Deckchair5 said:

You say "They diagnosed a faulty battery and a faulty RPM sensor" but did they actually change the rpm sensor and check its operation afterwards?

Click to expand...

Samuell1 said:

After complaining yesterday about the bill, they offered to put back the old part, the battery and rpm sensor because clearly that wasn't the problem.

Click to expand...

Does the car behave EXACTLY the same now that the old part has been replaced?

If so then it can certainly be discounted.

I called the dealership en ask about the diagnosis they made regarding to chance the rpmsensor. because in the list it isn't named. They told me that they have made other diagnosis, i asked the employee if he can e-mail me the other diagnosis and he did. Here they are, a little summery of the 12!!! diagnosis they made. I translated it from dutch, so the words may not be correct but here we go:

Diagnose 1
regulation unit; body computer

Fault
9029 Seriele lijn W-communication fault. intermittend


Diagnose 2
regulation unit; body computer

Fault
9024 RELAIS headlicht K.S. to earth ; INTERMITTEND


Diagnose 3
regulation unit body ABS bosch

Fault
C1521; unknown


Diagnose 4
regulation unit body ABS bosch

Fault
C1340; unknown


Diagnose 5
regulation unit; instrument panel

Fault
B100e; speedmeter; intermittend
B100C; indicator watertemperature; intermittend


Diagnose 6
regulation unit Body Computer
9024 relais headlicht
9029 Serie lijn w-communication fault
9019 Relais trunk, k.s. to earth
9037 airco(i don't even got that one),k.s. to +Vbatt


Diagnose 7
regulation unit ABS Bosch 5.7 asr/tc

Fault
C1521 fault messages CAN to I.E. Intermittend
C1340 brake switch intermittend


Diagnose 8
regulation unit ABS Bosch 5.7 asr/tc

Fault
C1521 fault messages CAN to I.E.
C1520 fault line Can


Diagnose 9
The Examiner smart

Fault
Regulation unit measured fault:

U1600 electronic key - no code received
u1601 Fault line c- can - bus off
p1687 inlet control valve- signal not plausibel


Diagnose 10

Fault
u1601 fault line c-can bus off intermittend

possible reasons
broken wiring
Line/s CAN in K.S. to +VBATT
Line/s CAN in K.S. to earth
Injection unit broken


Diagnose 11

Fault
u1600 elektronic key, no code received intermittend

Detection surcomstances:
Starting engine not approved
Universal code not received

Diagnose 12
The earlier post


How about that. I really don't know what to make of this. Maybe something for the techies?

I think this is one case in which error codes aren't going to be too helpful.

A faulty ECU is a strong possibility but not one you probably want to hear

I'd try a long shot first and check all coils packs using the substitution technique (only buy one) as one coil generating an EMF blast could be playing havoc with electronics.

After that it's down to using a voltmeter (as suggested in several previous posts) combined with careful examination of the wiring diagram.

The critical times to make voltage measurement will be when the engine is running fine compared to when it stops. Try to use an analogue meter as these will make a sudden voltage change much more obvious (a big change in voltage will provide a clue to the problem)

Reading this thread should give some insight into how to tackle fault finding. The symptoms are quite different but the actual techniques used will be much the same.

http://https://www.fiatforum.com/stilo/141712-abarth-earth-lead-coil-pack.html

I can believe that a coil can be the start of some intermittent faults. I also can believe that it can shut down a car. But i don't believe that it can hold a car up for 5-10 minuts. I think there are two problems, one is the car stops. The other is to get the car started. Maybe it is in one system, maybe there are separated systems. I do know it wil be a real struggle to get it started.