Re: Getting a small 12 v timer - home elelctronics?

There is an interesting site at Quasar Electronics which you may care to look at. Lots of tosh but also some useful ideas.

Scott.

If you can hear the relay coming in to play when you turn the key, the actuating coil inside the relay is most probably working ok. The weak point in any relay is the contact points and the actuating linkage from the coil to the contacts.

If you can, pop the cover off, give the contacts a clean. With a test meter, identify that 12 volts is present on one side of the relay contact and when closed, 12 volts is passed to the output side of the relay. If you can see the relay operate and can prove that the relay is closing correctly, and passing voltage, then you can be assured that the relay is in all probablility operating correctly.

Also be aware that the glow plug time varies with the ambient heat of the engine. On a cold day the woofer can hold the relay in anything up to a minute. In warm weather, 15 seconds at most. This on time is controlled by the ECU and information it is receiving from temp sensors fitted to the car. It may look like a short time the relay was engaged but this may be correct, or a premature turn off caused by an errant sensor elsewhere. As a side note, my 05 X-Trail DCi needs more cranking when cold than my Y plated 25TD, funny how the older design engine is an absolute brick in all weather conditons and the X-Trail needs longer coaxing, design being design I guess.

My personal guess is that the relay contacts are dirtied and need a look at before going elsewhere. Check the voltage is actually passing through the relay bfore you completely exonerate the part.

PDH

This is not to do with pre heating or cylinder temp / pressure issues, its a fundemental design trait of some common rail fuel systems and/or ECU software.

If you have for instance an Izusu 3.0DT (Cat oil-over-fuel system) these take anything upto 5-8 seconds of cranking in very cold weather glow plugs or not.

Tim..

"Tim (remove obvious)" wrote in message news:dp5uar$qdj$ snipped-for-privacy@nwrdmz03.dmz.ncs.ea.ibs-infra.bt.com...

Would not at all suprise me in the least, engineers love to change things. But again, as per the woofer, the time the glowplugs stay on is proportional to the weather conditions. The only time the woofer struggles is when its

PDH

Hi Dave,

Links here to the pdf of the diagram,

Hope you can help as would like to try this in a week or so.

Many Thanks

Scott

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