Can anyone advise, stared my Swift 630 L this morning and it started to run for a few seconds then cut out ( never done that before ) re-stared it but was running lumpy and would not pick up when pressing down the throttle. I connected my basic diagnostic scanner which came up with fault code P0127 IAT sensor too high ( intake air temperature ). The thing is I can not find it ! The only sensor I can find on the air intake is the AMS ( air mass Sensor ) my question is are both of these the same thing or am I looking in the wrong place , would be handy if anyone has had the same issue with there engine and what did they find was the solution ?
Fiat Ducato engine running rough.
- Thread starter bee-happy
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I asked for the year as the location of the IAT is different depending on the model. For instance on the X250 models it is integrated into the MAF.
PS: I would check your air filter. Have you had mice in there eating and nesting?
PS: I would check your air filter. Have you had mice in there eating and nesting?
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I had this once, on a very hot day shortly after I had bought my X250, about 6yrs ago in Hampshire. I called the AA but by the time they arrived, the engine had cooled down a bit and all they could find was a stored code. They cleared it and I replaced my Air Filter (which appeared clean) at the earliest opportunity, had no problems since.
As Gromett said, check Air Filter for mice etc. first.
As Gromett said, check Air Filter for mice etc. first.
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Thanks for the reply’s , I will investigate this afternoon , I doubt it was too hot as I discovered the problem around 10.00am yesterday and it wasn’t that hot then . I’ll let you know what I find.
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Sorry forgot to say my Motorhome is 2012 model.
Wow, my filter is spotless compared to your photo, ive just taken mine out and no sign of mice activity it is very clean but will order a fit a new one . I’ve taken a photo to show the only sensor within the Air filter pipe work and I’m wondering if the IAT is incorporated in my AMS sensor like the diagram that Grommet up loaded although mine doesn’t look anything like that one and I can’t find anything on a new AMS to support that. I've attached a photo shows my air filter box with filter removed , lower down my AMS body with sensor and wiring in the middle between the jubilee clips , the plug has 4 pins to it.
Wow, my filter is spotless compared to your photo, ive just taken mine out and no sign of mice activity it is very clean but will order a fit a new one . I’ve taken a photo to show the only sensor within the Air filter pipe work and I’m wondering if the IAT is incorporated in my AMS sensor like the diagram that Grommet up loaded although mine doesn’t look anything like that one and I can’t find anything on a new AMS to support that. I've attached a photo shows my air filter box with filter removed , lower down my AMS body with sensor and wiring in the middle between the jubilee clips , the plug has 4 pins to it.
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Hmm, appears I have been confusing MAF and MAP sensors my bad. My previous experience of this type of stuff was on the older models pre 2006 update.
I just did a search and found this thread.
www.fiatforum.com
Might be worth checking your reversing lights. Not likely but knowing fiat not impossible.
Also they have this image of possible location but he is not clear on the the year.
Probably looks like this?
I just did a search and found this thread.
IAT sensor where is it ? | FIAT Ducato
my engine management light is on and diag says iat sensor, where is it please ? my local garage replaced the maf but thr fault is still there ? is the sensor built into the maf / or is it somewhere else ?
www.fiatforum.com
Might be worth checking your reversing lights. Not likely but knowing fiat not impossible.
Also they have this image of possible location but he is not clear on the the year.
Probably looks like this?
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Your picture shows your MAF (Mass Air Flow) sensor and is also the IAT. Sensor with yellow clip. Your plug in reader should be able to tell you what temp it is recording.
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As his vehicle is a Fiat, if he hasn't already, I would suggest that the OP fits a second Earth Lead between a gearbox bolt and the chassis.Hmm, appears I have been confusing MAF and MAP sensors my bad. My previous experience of this type of stuff was on the older models pre 2006 update.
I just did a search and found this thread.
IAT sensor where is it ? | FIAT Ducato
my engine management light is on and diag says iat sensor, where is it please ? my local garage replaced the maf but thr fault is still there ? is the sensor built into the maf / or is it somewhere else ?
Might be worth checking your reversing lights. Not likely but knowing fiat not impossible.
Also they have this image of possible location but he is not clear on the the year.
View attachment 767247
Probably looks like this?
View attachment 767246
I've only just remembered I did this early on in my ownership of my X250 as it is supposed to be the cause of many electrical irregularities?
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I did wonder that but when I search for a replacement MAF ( note some call it Air Mass Sensor !) none of them state it is also a IAT, unfortunately my reader is really basic ( I should get a better one ) it tells me the fault code and will clear some faults but not this time clearly there is an issue.
See attached
See attached
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The MAF has a grid of fine wires stretched across the air duct which are electrically heated. As the intake air whistles past, it tends to cool down the wires, so more electrical energy has to be put into them to keep their temperature constant. Measuring this electrical energy indirectly indicates the air flow. The IAT is with the MAF so I knows what temp the air is so i can calculate what the MAF readings are.
That’s my understanding of it.
That’s my understanding of it.
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Both MAF and MAP have temperature sensors incorporated. the inlet manifold temperature is read by the MAF the MAP reads the boost/manifold temp.
I think ive seen 4or 5 different names for the MAFsensor
I think ive seen 4or 5 different names for the MAFsensor
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And that explains why the reversing light fuse blowing could possibly cause this error if that supply is also used to supply the MAF. That is what that forum link I gave above suggested.
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Thanks for that, it is interesting and hopefully a replacement MAF will resolve the issue and will be the 2nd one in two years ,it will be panic time if not as we’re supposed to be going to France really soon !!
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Good luck. Fingers crossed that is what it is.
Have you checked the reverse light by any chance. Highly unlikely and strange but worth a quick look even out of curiosity and ruling one more thing out quickly.
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I think, from memory that you can “program“ the new MAF on ecu. Program isn’t the correct term but I can’t think of anything better currently.
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A much more useful better detailed manual can be found if , fiat-ducato-1stx250training-manual.pdf is googled . (I do not know how to do a link)
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Configure? Set the parameters?
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Yes the MAF has to be configured on the ecu. Done by multiecuscan section F7 Air flowmeter sensor replacement and reset learned functions. (for an x290). would need precise model to check (at least 8 variants of x250) some do some dont.
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- Apr 6, 2019
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Earth leads (replace and add more) as mentioned already.
Cured multiple grumbles from my old Ducato.
Cured multiple grumbles from my old Ducato.
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Thank you for the info, yes It is and all tight and secure secure. My Motorhome is a 2.2 -130 multi jet .
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Ok, so are we talking about something like earthing straps to and from gearbox/engine to chassis ?
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Ok, so are we talking about something like earthing straps to and from gearbox/engine to chassis
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- Apr 6, 2019
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yes.
Follow neg lead from battery and check connection to ---- wherever it is bolted to. If you can access it, take the connection off the body, sand paper it and refit. You can test bad earthing by putting a nice jump lead on Neg of battery and the other end t the main engine block. Now try and start it and see if it runs smoother.
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I’m sure the last time I fitted the
thanks For quick response, I’ll order 3-4 and install them this week .
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- Apr 6, 2019
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It is god practice but I would try the jump lead test I mentioned to see if you get instant improvement?
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Ahhh, are you saying that it will have to be done by Fiat’s !! ( I do hope not as there ridiculously expensive ) .
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