Could really use some help with Doblo 1.4 2006!

[parkingtonhatter]

I'm in real need of some help, if anyone is able to, as I need to get this going, as the MOT is now overdue, and I don't have off-street parking 

Codes: P0105, P0101, P0106. 
FIAT DOBLO FREEDOM 2006 1.4 8V MANUAL
YY06 OKT

Problem started with stuttering from cold, taking a few tries to start. 

Once running, all fine. 

Then wouldn't start after multiple attempts, so I disconnected the MAP sensor and was able to drive back 200 miles from Scotland to York, no problem. 

Bought a new MAP sensor, but no improvement. Was able to drive it for a couple of minutes, and then it seemed to go into limp mode. Restarted engine and same again. 

Lack of Haynes manual or YouTube material on this model is making a diagnosis difficult for me. 

Battery ran flat due to it sitting over the last couple of months, so I've fitted a new battery as it was ancient anyway, but still can't get it to start beyond a few seconds.

Any advice, or pointers to material that will help me, or just anything at all would be so much appreciated.

[E-bmw]

parkingtonhatter said:

Codes: P0105, P0101, P0106. FIAT DOBLO FREEDOM 2006 1.4 8V MANUAL

Problem started with stuttering from cold, taking a few tries to start. 

Bought a new MAP sensor, but no improvement. Was able to drive it for a couple of minutes, and then it seemed to go into limp mode. Restarted engine and same again. e. 

Battery ran flat due to it sitting over the last couple of months, so I've fitted a new battery as it was ancient anyway, but still can't get it to start beyond a few seconds.

All of those codes are referring to intake manifold pressure being incorrect.

Firstly, I assume the engine is a Normally aspirated petrol engine.

My first port of call would be to remove everything easily removable from the inlet on the car, check for air leaks, check for tightness of joints, check all gaskets, and generally ensure there is no way un-metered air can get either in or out.

[parkingtonhatter]

Thank you so much! I'll start on that today. I really appreciate the advice.

[parkingtonhatter]

Yes, a 1.4 petrol

[E-bmw]

A common possibility can be "concertina" rubber intake hoses that have splits in the rubber, another common one is "jubilee clips that aren't on right or are too tight.

[GreenV8S]

One quick and dirty way to locate suspected intake air leaks is to spray carb cleaner along the intake while the engine is idling. If the revs pick up, the engine has drawn the solvent in through an air leak.

[E-bmw]

I would have said that also, alas I suspect he hasn't got anything that technical.

[parkingtonhatter]

Great. I'll check the hoses and clips. Really appreciate it.

[parkingtonhatter]

Carb cleaner tip - thanks so much!

[A500leroy]

Fiat forum.com

[s p a c e m a n]

Make sure that the carb cleaner that you use is flammable

[s p a c e m a n]

Make sure that the carb cleaner that you use is flammable

[parkingtonhatter]

Thanks A500leroy, I've posted there as well.

[Richard-D]

Ideally if you know someone with a diagnostic scanner (really cheap one will do, android phone and torque app is ideal) look at manifold pressure with ignition on and engine off. If significantly different to ambient you have something to go on.

[paul_c123]

P0105 MAP circuit problem
P0101 Issue with the MAF sensor
P0106 Issue with the MAP sensor

Did all 3 of these errors occur at once?

You need to carry out guided diagnostics on those areas, eg check for plausible signal (ie using live data on a diagnostic computer to make sure they read common sense values), check for 12V and grounds. Visual inspection of connectors at both ends of the cables and any intermediate joins. Look at a wiring diagram to see if they share eg a common earth, or common power feed - especially since 3 errors all occur at once.

There is also a bulletin to suggest that gradual fouling of the throttle body sends the ECU into a zone its unable to control properly in, resulting in the P0105 code. This can be fixed by reprogramming it to Flash CD 2.90

[parkingtonhatter]

Thank you so much for your detailed response; some of it was above my head, but I'm keen to learn, so I'll be looking it all up. To answer your quesiton, yes, all three codes did come up at once. I'm wondering if I should be buying a Fiat OBD2 diagnostic tool, such as EcuScan, so that I can get more than the generic codes... not cheap though!

[E-bmw]

You don't necessarily need a more expensive scanner to "read non-generic codes" it is generally more a case of the non-generic codes need to be looked up as the generic scanner may not be able to interpret them, but will likely still show them alpha-numerically.

For instance I have a pretty good one that shows everything but even that I have to google some of the code descriptions that are non-generic, but they are all shown.

[paul_c123]

parkingtonhatter said:

Thank you so much for your detailed response; some of it was above my head, but I'm keen to learn, so I'll be looking it all up. To answer your quesiton, yes, all three codes did come up at once. I'm wondering if I should be buying a Fiat OBD2 diagnostic tool, such as EcuScan, so that I can get more than the generic codes... not cheap though!

If all 3 came up at once, it points towards a wiring issue with the sensors at a common point. For example, they may share a connector, earth point or a fuse.