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Old 26-04-2010   #1
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Help Identify Engine Part on JTD 110 Multipla

Jumped in the Multipla this morning and noticed a horrible diesel-like smell. After much rummaging around underneath the car and under the rear seats I found the cause: a can of diesel treatment that had been crushed under the driver's seat sliding mechanism.

But, whilst searching for the source of the mysterious diesel odour I noticed a small rubber pipe on the front underside of the engine that has been completely severed!

The pipe is a soft, silicon type rubber in bright red and connects from a small cannister object that is mounted on the front lower-edge of the engine and points down at about a 45 degree angle (roughly behind the number plate). The pipe is about 18" long and runs up below the air cleaner to a small square device with some electrical connections (sorry, I'd take a photo but my wife has gone out for the day in the car.)

I think I have identified the tube in the FIAT ePer catalogue, arrowed and indicated in red in the following image:



The part SGR. 10252 is listed under the SUPERCHARGING category which I'm guessing is the "turbo" as the JTD 110 is a turbo-diesel model:



I can easily fix the hose but would like to know what part #55188059 is as it is only listed as "ELECTRO-VALVE"? Is this the infamous MAS? Would it also explain why my engine management light is now permanently on but the car still drives fine?

Thanks for any help and guidance.
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Old 26-04-2010   #2
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Re: Help Identify Engine Part on JTD 110 Multipla

The pipe you indicate runs from the item you want to know the name of -> turbo boost valve (little black box) to the turbo (cylindrical pot) replace and all should be well. An improvement in performance should also be noticed if the actuating arm is free.

I think you had a typo and meant MAF not MAS. The MAF it the cylindrical item -with the plug at the rear- immediately after the airbox and is the Mass AirFlow sensor

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Old 27-04-2010   #3
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Re: Help Identify Engine Part on JTD 110 Multipla

Thank you, Peat.

I had a look this evening and after snipping one end of the pipe square again there was just about enough length left to reconnect it back to the "turbo pot". Disappointed to report that the red light is still lit on the dashboard with the message "ENG. MNGT. FAULT."

I did however try disconnecting the electrical connection to the "turbo boost valve" to see what would happen. Well, not a lot other than the revs wouldn't top 3,000 RPM so the computer must have put the car into "Limp Home" mode. After re-connecting the sensor I still had the red warning light and message but no limit on the revs. Does the turbo run all the time or only when needed when you put your foot down? Can't say that the car has ever had a noticeable kick if that's what it should have.

You mentioned an actuating arm: is this in the sensor or on the turbo? Can I check it's working and can it be fixed? I recently removed and cleaned the EGR valve so I don't mind fiddling with it for a few hours if worthwhile.

It's a bit of a mystery really and as the car does so little mileage and is probably worth less than a grand (Y-reg with 140K on the clock) I'm not willing to throw hundreds of pounds at it to get this, that and the other sensor or valve replaced without a definitive diagnosis (I've read too many posts on these forums about EGRs and MAFs being replaced one-by-one and each time it making no difference.)

Regards,

Peter
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Old 27-04-2010   #4
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Re: Help Identify Engine Part on JTD 110 Multipla

Quote Originally Posted by staticboy View Post

You mentioned an actuating arm: is this in the sensor or on the turbo? Can I check it's working and can it be fixed? I recently removed and cleaned the EGR valve so I don't mind fiddling with it for a few hours if worthwhile.

The 'actuating arm' is on the turbo adjacent to the 'cylindrical pot' that your orange/red piping fits on. It should move freely, so lots of lubrication and some judicious tapping with a blunt instrument if it has ceased.

It may be prudent to remove the turbo boost valve and clean out the micro filter within, but be very careful if you do so as it's fragile and expensive!

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