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Old 25-08-2013   #1
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JTD MAP sensor boost Error P0236

Got my first MIL and engine fault notification last night.

It came on on the m'way, never noticed any change in the power. then as i came to junctions and other roads i discovered there was no boost any more.

So later then i got back in the car and the MIL light still on, but car drove normally, with boost. I got home and put multiecuscan on, got a P0236 Boost pressure error, which i cleared, light went out, and took it out for a spin...

drove fine for a while, then light came on again, so it seems there is an intermittent fault - im assuming the MAP sensor?

Can this be cleaned or is it pointless with it detecting pressure? And if i replace it, would it need to be a genuine fiat one, and if so anyone know how much? i see there are new ones on ebay with 2 year warranty for 12.99.. but in previous cars things like aftermarket ABS sensors etc didnt work with the car

Anyone have any experience with this? I was thinking with it being an intermittent fault that its more likely the sensor on its way out, as opposed to a leaky hose or anything

Any assistance appreciated, ta (2004 1.9JTD(115))
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Old 25-08-2013   #2
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Re: JTD MAP sensor boost Error P0236

12.99 isn't exactly the end of the world however there was a software update for this error that your car might not have had done yet?
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Old 25-08-2013   #3
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Re: JTD MAP sensor boost Error P0236

Quote Originally Posted by T14086 View Post
12.99 isn't exactly the end of the world however there was a software update for this error that your car might not have had done yet?
Aye i know 12.99 wont break the bank, will have to price a genuine fiat one, would rather have it in my pocket if somebody knows the ECU wont like it.

Have heard nothing about that software update and ive only had the car a few weeks so ive no idea if it has had it or not
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Old 25-08-2013   #4
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Re: JTD MAP sensor boost Error P0236

I brought 2 MAP sensors from Russia (postmark) and they were fine on both of my cars.
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Old 29-12-2013   #5
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Re: JTD MAP sensor boost Error P0236

Just to update everyone on how i got on, only got looking at mine yesterday & today. Issues solved by the way.

Just to sum up my issues first, car was slow to rev up in low rev range - this was cured by blanking off EGR.

Had a problem also where car wouldnt rev past 3000 rpm; on a level road in 5th gear top speed was around 80mph with foot flat to floor, revs would only go to just below 3000 rpm. If you came to a hill and foot flat to floor still, car would slow down to around 70 or below, revs would drop to about 2500 rpm and just wouldnt go any higher.

If in a lower gear say 3rd or 4th if you held revs as high as they would go (approx 3000 rpm) then EML would come on and generate code P0236. Under normal driving though you could avoid this. Average MPG was around 45mpg, ill keep an eye and see if it now improves any - technically it should if black smoke is reduced etc.

So last night i removed the hose from the turbo to intercooler - was all covered in a thick oily grease. I cleaned it up and inspected it and couldnt identify any leaks. I covered the entire length in 2 layers of gaffa tape to test and refitted, power seemed to be improved, but still couldnt rev past 3000 rpm. I dont think the pipe was leaking but it may have leaked a little at either end or something.

I should note there was little difference with the MAF unplugged, it revved a little higher however there was little power near 3000+ rpm.

Anyway i removed the MAF to investigate and the cage/mesh ends of it had heaps of black stuff and bugs etc stuck to it. So i cleaned it all as best i could with electrical cleaner etc and refitted - problem now totally cured, revs on past 3000 rpm with ease and no hesitation and continues to pull right to red line. As i said before when i unplugged the MAF before it made little difference, but obviously even with default values it still wont let you rev too high with boost if it cant measure the airflow properly.

I was also experiencing a lot of black smoke and im fairly sure that is now significantly reduced as well.

Hope this helps someone else in their quest for power.
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