jza800 Posted May 25, 2020 Share Posted May 25, 2020 I have a leaking capacitor, it is the IC103 capacitor, does anyone know what that supply power to? i also have a one of the blue resistance that have changed colour in the middel, it is the left of the too that are side to side, is that pretty normal that they change colour due ages? i know i am gonne repair it, but like to know what the IC103 powered or are doing. Quote Link to comment Share on other sites More sharing options...
Shane Posted May 25, 2020 Share Posted May 25, 2020 IC103 is the inline Integrated circuit at the bottom of the picture, the capacitor reference is C118. That looks like a 1 ohm resistor and with a resistor of that wattage and age that's minor discolouration. Can't help you with cap function, but would say that its essential you replace with High Ripple Current capacitors. If not you will be dong it twice. Quote Link to comment Share on other sites More sharing options...
jza800 Posted May 25, 2020 Author Share Posted May 25, 2020 IC103 is the inline Integrated circuit at the bottom of the picture, the capacitor reference is C118. That looks like a 1 ohm resistor and with a resistor of that wattage and age that's minor discolouration. Can't help you with cap function, but would say that its essential you replace with High Ripple Current capacitors. If not you will be dong it twice. OK, thanks for your answer, just like to know what it does and powered, as i have other problems on the car, so just want to know if that capacitor could be the one that made my problems on the car Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted May 25, 2020 Share Posted May 25, 2020 Im pretty sure nobody but the people who designed it could tell you that Quote Link to comment Share on other sites More sharing options...
jza800 Posted May 25, 2020 Author Share Posted May 25, 2020 Im pretty sure nobody but the people who designed it could tell you that Ok i didn't know, i thought is was possible to know what it did go out to, if is was a sensor injector map sensor etc. or something like that.. Quote Link to comment Share on other sites More sharing options...
Noz Posted May 25, 2020 Share Posted May 25, 2020 (edited) Ok i didn't know, i thought is was possible to know what it did go out to, if is was a sensor injector map sensor etc. or something like that.. You could trace where it goes to determine what function or components it supports. Which would be a good indicator of what it does. I used to repair electronics for a living and you dont need the manufacturers to give you the golden nod on what it does. That's just nonsense. However. A faulty capacitor can cause issues you could never expect even when it looks fine. Visually you may have the right capacitor. That component or component that may contribute towards your issue may be totally different. To predict what problems could be caused by that capacitor leaking or by others current failing components is impossible. Youd be best to just replace any failed visual components and if it doesnt resolve anything call it a day. As you need it running during testing to be able to identify components and that's less than ideal so I'd call it not possible. Due to the risk involved. Testing prodding an ecu while running on an engine. Best to identify the value on the side of the capacitor and replace it. It's good practice either if it isnt detrimental to your issues just yet. Personally if you have other issues suspect of the ecu. It's time to source another one. Of course. Just my opinions. Edited May 25, 2020 by Noz (see edit history) Quote Link to comment Share on other sites More sharing options...
jumpbike Posted June 5, 2020 Share Posted June 5, 2020 Caps of that style have a typical life time of 5000 hours and that's these days, not 20 years ago. It is amazing old electronics work as long as they do as most are well past their designed service life. You could just replace it for a like for like, you might even find it will work perfectly without it although you risk damaging other components then. Quote Link to comment Share on other sites More sharing options...
93ttsupra Posted June 15, 2022 Share Posted June 15, 2022 any idea of the specs on these capacitors? or where to find them? Quote Link to comment Share on other sites More sharing options...
mwilkinson Posted June 16, 2022 Share Posted June 16, 2022 I found these: https://uk.rs-online.com/web/c/passive-components/capacitors/aluminium-capacitors/?applied-dimensions=4292049516,4294965481,4294466590,4294885425 Quote Link to comment Share on other sites More sharing options...
93ttsupra Posted June 16, 2022 Share Posted June 16, 2022 Thank you Quote Link to comment Share on other sites More sharing options...
VMX Posted November 7, 2023 Share Posted November 7, 2023 This might help others…my stock 1996 S1 non turbo Mk4 decided to run incredibly rich, not idle and run rough. I found two electrolytic capacitors in the ECU leaking. Specifically C616 and C617. I replaced them and the car immediately ran perfectly. Problem fixed. The other 6 electrolytic capacitors looked ok, but I circled back and replaced them anyway. Quote Link to comment Share on other sites More sharing options...
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