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Me7.5 Capacitor burned?
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Topic: Me7.5 Capacitor burned? (Read 4505 times)
Jim_Coupe
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Me7.5 Capacitor burned?
« on: November 11, 2016, 10:00:55 AM »
Hi, yester day i fired up my 1.8T after some rebuild.. But the egnine runs very poor and i have no codes.
After some time my ECU stopped reponding and i could feel the smell of burned electronics.. It was a capacitor that was broken.. I changed it from another ECU and the ECU responded again.. But now the big question! What does this Capacitor do? I want to know since i believe that i have som serious issue with my harness.. Probably a short ciruit somewhere..
Look at pic below... Any one knows what this ciruit is connected to ?
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prj
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Re: Me7.5 Capacitor burned?
« Reply #1 on: November 11, 2016, 10:24:25 AM »
The only way to blow a cap is to overvolt it. So if it blew, measure the voltage. If it is in spec, then just replace the cap with a new one of the same voltage and preferrably the same capacitance, and job done.
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Jim_Coupe
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Re: Me7.5 Capacitor burned?
« Reply #2 on: November 11, 2016, 02:31:59 PM »
Ahaa,, overvolt you say.. From a short circuit or maybe my battery is broke.. Iva never experienced my car running this wierd.. driving me nuts.. Im going to check my harness tomorrow.. Thanks for the help
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adam-
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Re: Me7.5 Capacitor burned?
« Reply #3 on: November 11, 2016, 03:09:35 PM »
No, overvolt would come from the alternator. Measure the battery voltage when running. A short wouldn't cause this.
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Jim_Coupe
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Re: Me7.5 Capacitor burned?
« Reply #4 on: November 14, 2016, 02:12:11 PM »
I found the problem... "I think".. I think it was the charger that was hooked to my laptop that leaked... lol my whole laptop was electrified haha... I found that the ground in the jack where my chager was connected was bad lol.. I managed to fix the ecu..
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