jonniebravo
20th February, 2012, 04:16 PM
Hi guys,
I have problem with fiat stilo jtd 115hp, 192A1.000.
Problem is not consistent, it comes from time to time, car all by itself starts adding throttle.
It revs up to 3 or 4000 rpm without touching anything. I checked with KTS and I have error that APP(Accelerator Pedal Position) potentiometer 2 is not ok and also error P1555 for brake switch.
When i go to live data in kts I can see that potentiometer 2 signal is not consistent, in neutral position it should be giving 0,3-04 volts and when pedal fully pressed 1,8 volts.
It has that scope of voltages and it is linear but from time to time i can see that signal goes to 0 volts, its random, it happens no matter in what position pedal is. Car was tested with another accelerator pedal and its the same.
I took scope and connected it to signal wire on ECU connector(80) and ground(79), signal looks like on attached picture(its just drawing scope.jpg) it looks like 0,4 volt drops, i noticed that they are all of the same length.
I was unable to diagnose car when it starts acting crazy, because when car arrives at my place it works normally.
http://s18.postimage.org/48wlceb8p/app.jpg
http://s17.postimage.org/w5obwn4v3/scope.jpg
Has anyone ever had problem like this?
And if you had this problem, please don't tell me that car was fixed all by itself. :D
As for error with brake switch I searched through fiat forums, and it's common error which occurs when you press both accelerator and brake pedals in the same time. I also "recalibrated" brake switch, i.e. pulled it down and let brake pedal push it back in it's final position.
I have problem with fiat stilo jtd 115hp, 192A1.000.
Problem is not consistent, it comes from time to time, car all by itself starts adding throttle.
It revs up to 3 or 4000 rpm without touching anything. I checked with KTS and I have error that APP(Accelerator Pedal Position) potentiometer 2 is not ok and also error P1555 for brake switch.
When i go to live data in kts I can see that potentiometer 2 signal is not consistent, in neutral position it should be giving 0,3-04 volts and when pedal fully pressed 1,8 volts.
It has that scope of voltages and it is linear but from time to time i can see that signal goes to 0 volts, its random, it happens no matter in what position pedal is. Car was tested with another accelerator pedal and its the same.
I took scope and connected it to signal wire on ECU connector(80) and ground(79), signal looks like on attached picture(its just drawing scope.jpg) it looks like 0,4 volt drops, i noticed that they are all of the same length.
I was unable to diagnose car when it starts acting crazy, because when car arrives at my place it works normally.
http://s18.postimage.org/48wlceb8p/app.jpg
http://s17.postimage.org/w5obwn4v3/scope.jpg
Has anyone ever had problem like this?
And if you had this problem, please don't tell me that car was fixed all by itself. :D
As for error with brake switch I searched through fiat forums, and it's common error which occurs when you press both accelerator and brake pedals in the same time. I also "recalibrated" brake switch, i.e. pulled it down and let brake pedal push it back in it's final position.