paddycento
New member
Hi all,
Car: Fiat Stilo 1.9 JTD 115 "02".
The problem is with starting, when trying there appears to be a massive current drain on the battery, cranks 2 times before lights go off and no more cranking.
First thought was battery as we all know how Stilo's love a strong battery. So I went and bought a heavy duty one and fitted.
Result was the same problem.
Next thought was starter motor, so got it off (easier said than done), pulled it apart and found worn brushes (thought great found the problem) see attached photo of old. So ordered a set of new brushes complete with holder. They arrived, were fitted. Tested the starter motor on the bench and it span well although obviously this was with no load so not a true test but still reassuring. Then re-attached the starter motor to the stilo.
Result still the same problem although not all bad as the brushes clearly needed changing.
Next thought was to use FES and check error codes:
U1706: engine> ABS data line no signal
U1600: Immobilizer: key faulty no signal
P0190: Diesel pressure sensor signal high
U1700: CAN: Body computer conn. fault (1) no signal
I was able to clear all of these with FES, then tried to start the car again...same problem. So checked the error codes again, but they had not come back. Initial thoughts on this are that they were stored from when the battery voltage was low as I'm sure you all know the how many strange things happen when its low.
So the reason why I think it is now an electrical short somewhere is that when measuring the cranking voltage accross the battery it drops from 12.8V to 7V, I would only expect it to drop to maybe 10/9V? Would someone please be able to measure their cranking voltage for comparison? (voltmeter across terminals set to 20V and someone start the car while you watch what the voltage drops down to)
My next trial is going to dissconect the supply and control voltage lines to the starter motor and attach jump leads, then use a battery to spin it, this will hopefully rule out the starter motor. (possible shorted wind although would have expected it not to spin on bench if thats the case).
Any thoughts would be appreciated as I'm a student and can't afford to keep spending money on it even if I do love it.
Thank
Car: Fiat Stilo 1.9 JTD 115 "02".
The problem is with starting, when trying there appears to be a massive current drain on the battery, cranks 2 times before lights go off and no more cranking.
First thought was battery as we all know how Stilo's love a strong battery. So I went and bought a heavy duty one and fitted.
Result was the same problem.
Next thought was starter motor, so got it off (easier said than done), pulled it apart and found worn brushes (thought great found the problem) see attached photo of old. So ordered a set of new brushes complete with holder. They arrived, were fitted. Tested the starter motor on the bench and it span well although obviously this was with no load so not a true test but still reassuring. Then re-attached the starter motor to the stilo.
Result still the same problem although not all bad as the brushes clearly needed changing.
Next thought was to use FES and check error codes:
U1706: engine> ABS data line no signal
U1600: Immobilizer: key faulty no signal
P0190: Diesel pressure sensor signal high
U1700: CAN: Body computer conn. fault (1) no signal
I was able to clear all of these with FES, then tried to start the car again...same problem. So checked the error codes again, but they had not come back. Initial thoughts on this are that they were stored from when the battery voltage was low as I'm sure you all know the how many strange things happen when its low.
So the reason why I think it is now an electrical short somewhere is that when measuring the cranking voltage accross the battery it drops from 12.8V to 7V, I would only expect it to drop to maybe 10/9V? Would someone please be able to measure their cranking voltage for comparison? (voltmeter across terminals set to 20V and someone start the car while you watch what the voltage drops down to)
My next trial is going to dissconect the supply and control voltage lines to the starter motor and attach jump leads, then use a battery to spin it, this will hopefully rule out the starter motor. (possible shorted wind although would have expected it not to spin on bench if thats the case).
Any thoughts would be appreciated as I'm a student and can't afford to keep spending money on it even if I do love it.
Thank