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Dealing with the 'Preheat Fault' message [Stilo JTD]
Argonought
22-06-2008
Glow plugs (or heater plugs) are used to warm the cylinder on cold mornings when starting a diesel. Unlike spark plugs, which are used continuously in an engine and therefore wear out over time, a glow plug is more like a light bulb and they either work perfectly or they donít work at all.<br />
Old 28-07-2011   #15
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Re: Dealing with the 'Preheat Fault' message [Stilo JTD]

Did the above procedure on mine, came up on multimeter as all 4 plugs working so put all back together. Warning went away after one start and have started several times since.
Must have been dodgy connection. Thanks for guide either way!
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Old 19-09-2011   #16
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Re: Dealing with the 'Preheat Fault' message [Stilo JTD]

Argo, your a genius, great guide!
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Old 22-10-2011   #17
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Unhappy Re: Dealing with the 'Preheat Fault' message [Stilo JTD]

Quote Originally Posted by PhilM Star View Post
I have managed to change one of the four, the one on the green wire. It was pretty straight forward but I had to disconnect the fuel lines and buy a long reach 10mm socket. The hole for the plug is quite a way down and on my first attempt the new plug fell off the socket and went down behind the engine. I had to get underneath to reach up and retrieve it. the second time I put a small amount of paper round it so it was held more firmly by the socket. Take care not to use too much that it might go into the engine. Just a very fine strip around the actual hex shape that the socket goes on. I was very carefull not to cross the threads as stripping these is going to be a real pain. I think some of the others may be more fiddly but do-able. The plug was very cheap off e-bay. Halfords dont stock the one for a 1.9 JTD
Having written this a little while ago I thought I would update it. Another plug has gone and I have the pre heat message all the time on statup. Followed the procedure again to find it was the third plug that had gone, the one on the black wire. Had a go at changing it but found it impossible. There is a metal fuel pipe in the way and the copper tube from the common rail crosses above the plug. I put everything back and will take it to a garage. I guess they have some special tools for this. I think plugs one, two and four could be done but three needs parts stripping down to access it which I wasnt confident to do and not sure of potential damage I may do. Leave it to the garage.
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Old 06-11-2011   #18
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Re: Dealing with the 'Preheat Fault' message [Stilo JTD]

I've just done 1 and 2 on mine having found them both open circuit. I bought a socket set for the purpose via Ebay. It has deep glow plug/ spark plug type sockets with a UJ type drive and deep sockets which have a sprung clip in the end to retain the plugs and a 3/8th drive. It is a very fiddly job as the injector pipes are in the way amongst other things. You're not going to strip threads removing but you need to be careful when putting the new ones in as you don't want to start off cross threaded. I used a length of ally tubing which was a tight fit on the end of the plugs to hold them and start off the screwing back in. This way, you can hold them straight as the ally tubing is not fouled by anything so the plug is kept straight to it's hole. You can't do this with a socket as, even with a UJ, it would be extremely difficult to get it to start straight. It did take several starts of the engine to get the fault light to clear (about 8 I think).
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Old 12-11-2011   #19
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Re: Dealing with the 'Preheat Fault' message [Stilo JTD]

Is it the same for Punto 1.9 jtd? Obviously everything isn't in the same place etc. I mean in general.
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Old 14-11-2011   #20
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Re: Dealing with the 'Preheat Fault' message [Stilo JTD]

Hi thanks for this awsome thread
Done this today but i am very noob lol.
i bought a multimeter from homebase for £15 so obviously wasnt the best in the world but all the same worked fine.
on Pin 1 (YELLOW) = Cylinder 4 i got no reading wat so ever
on the other 3 i got the same reading .. 1

Im gona have a go at changing the plug my self tomorow. if i still get this preheat message could it be the actuall wire that we are testing with the multimeter? phillip from another thread has pointed this out to me.and if so has any one got a guide to changing it? will this be a hard job? thanks guys
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Old 15-11-2011   #21
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Re: Dealing with the 'Preheat Fault' message [Stilo JTD]

SUCCESS! changed cylinder #4 glow plug , my first ever glow plug change and tbh was very very simple and took me about 20 mins and it solved my preheat problem 100 %
Thanks guys
i undone the 10mm fuel line nut to gain better acces to plug,unscrewed with long socket arm and removed old plug with long nosed plyers and installed new plug using the paper method mentioned a few posts back and it worked very well and poped the lead back on with the socket arm and reset computer with fiatecuscan.
Thanks guys
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Old 12-04-2012   #22
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Re: Dealing with the 'Preheat Fault' message [Stilo JTD]

Excellent diagnotic guide! Did as you suggested and came up with the dreaded red wire, no.1 cylinder. I managed to change the plug with a bit of wriggling and all is now well, although I did manage to snap on of the plastic return pipes on top of the injector. Of course, no-one carries such a thing in stock and my nearest FIAT dealer is thirty miles away....but....Ford dealer managed to find a very similar item (slight angle on pipe is the only difference) and all is now well again.

This is definetly not a job for the faint hearted as there are so many expensive disasters waiting to happen. If in the slightest doubt about doing it...don't!

I might mention that the engine performance is much smoother now.

Thanks for the info, I would have been cluless without it.
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Old 12-04-2012   #23
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Re: Dealing with the 'Preheat Fault' message [Stilo JTD]

Well done but highly recommend you change the other 3 too. Similar to spark plug changing. They may not be far behind in dying too.
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Old 13-07-2012   #24
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Re: Dealing with the 'Preheat Fault' message [Stilo JTD]

Quote Originally Posted by Argonought View Post
Note: cylinder 1 is always furthest from the flywheel or if you prefer is next to the cam belt cover
I changed the wrong glow plug because Red(pin 4) was next to the flywheel on my car.
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Last edited by Shadeyman; 13-07-2012 at 14:27.
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Old 27-10-2012   #25
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Re: Dealing with the 'Preheat Fault' message [Stilo JTD]

The diagnostic procedure on MJTD versions can be even simpler than this.

One only has to remove the engine cover and then measure the resistance between the exposed part of the plug itself (indicated by an arrow on the following image) and the engine (ground).
This way you also don't have to worry about replacing the wrong glow plug.
The wire colors on MJTD (at least on mine bought in 2004) are different than the ones in this guide (as shown in the upper right corner of the image) so the blue wire goes to the rightmost cylinder (4).
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Old 27-10-2012   #26
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Re: Dealing with the 'Preheat Fault' message [Stilo JTD]

Changed htr plug #1 this morning after diagnosing it using the method in this guide - no probs - easy job - used a bike spoke to pull the connector off off - used 1/4 drive ratchet & long extn bar with deep 10mm socket, I secured the sock to the extn bar with some insulating tape to prevent it comming off, I also lined the inside of the socket with the same to make it a tight fit on the plug - make sure you use only a six sided socket - the 1/4 drive ensures you wont exert enough torque to break anything. I have the other four plugs but decided not to change them - I found this guide extemely helpful....Many thanx
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Last edited by davyowens; 27-10-2012 at 14:06.
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Old 26-11-2012   #27
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Re: Dealing with the 'Preheat Fault' message [Stilo JTD]

N 1 on connector, yellow 153
others are 000-open circuits

so Number 1 is out?
and I think thats the most right one which is illustrated above on robbie-rocket-s post?
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Old 31-03-2013   #28
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Re: Dealing with the 'Preheat Fault' message [Stilo JTD]

I have changed these myself before but now have one that is totaly siezed in. Three different garages have had a go but say they are afraid to try too much as it may snap and I should just live with three. I was wondering if I let the engine run to heat up and expand the metal will it help? Any other suggestions?
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Old 18-05-2013   #29
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Arrow When it goes wrong!

Quote Originally Posted by PhilM Star View Post
I have changed these myself before but now have one that is totaly siezed in. Three different garages have had a go but say they are afraid to try too much as it may snap and I should just live with three.
Even if it did shear off, you wouldn't be any worse off - and a good garage should be able to drill it out (albeit expensive of course).

My #2 plug failed recently so asked my usual garage to replace it but unfortunately it turned into a complete disaster. The thread stripped on the way out which instantly made a perfectly serviceable car unusable

This is why it can be madness to attempt to change plugs which are functioning OK (especially so on an old engine)
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