What component ?

Question

Hello all,my car is a Merceder Benz vito -99, which has a CDI type of motor withBosch-Engine management system (EMS).This EMS has now one component which is making a whirring sound everyday when the temperature is high.The picture of that component can be found from this page: page contains link for small picture (100kt), where component ismarked with red rectangle. From the big picture (600kt), the codes canbe seen if picture is zoomed in.Every information about this component is very welcome! It is quiteeasy to replace it, as it is soldered from 4 pins which are clearlyvisible in the other side of the PCB.My best quess is that component is relay or coil, but no confidence ascouldn't find component from the web.Best Regards,+Tuomas

petrus bitbyter · Accepted Answer

"Cyrus" schreef in bericht news:Wv7Ae.8078$Eo.3640@fed1read04...

With four pins? I doubt it, although I admit 15u seems to say so.

Besides, *if* it is a relay, it may not be the relay that is faulty but the control signal.

Anyone recognizes the logo? A search by manufacturer may be helpful.

petrus bitbyter

Cyrus · Answer

It seems to me it is 15u ( 15 microfarad ) capacitor.RegardsCyrus

NSM · Answer

It's a relay and if it's buzzing you have a problem - probably not therelay.N

Fred Bartoli · Answer

"petrus bitbyter"  a écrit dans lemessage de news:42d13ffc$0$20934$theIt definitively is a 15uF /100V capacitor. I have a 1.5u-250V of the samemanufacturer and series at hand.SM stands for Siemens Matsushita, which I believe is now  .-- Thanks,Fred.

thakuli · Answer

Thanks Fred!that was a good tip and the component indeed is a capasitor and thegeneral description of that component can be found from here:Now it is time to start thinking why component is making a whirring(or ticking) soundAny guesses?Best Regards,+Tuomas

Tom MacIntyre · Answer

The extra pins are possibly for strength and stability of thecomponent, perhaps?Tom

legg · Answer

These are MKT(polyester) capacitor packages developed by EPCOS (Siemens-Matsushita) for Bosch.

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Unfortunately a catalog page refering to a type B26685 15uF, 100Vdc, boxed, four-terminal film capacitor doesn't seem to be available on the EPCOS website.

Due to the physical size and the pulse application of the part, the occurance of audible noise, particularly in hotter environments, may be normal.

RL

thakuli · Answer

Yes, most possibly. with 4 pins the component stands very stable compared to 2 pins. Also there is more metal to flow the current. The compnent is very simple and the 2 pins in the other end of the component are plus and the 2 pins in the other end are groud

NSM · Answer

But it's buzzing? That can't be good.N

What component ?

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