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Bantus123



Member Since: 12 Feb 2022
Location: Cataluna
Posts: 3
Spain 
MAF sensor failure Puma
Hello everyone,
I own a Defender 2007, 2.4. with around 240.000km

Very happy with it so far, but recently it is producing errors related to the MAF and Diesel injectors.
First error was related to failing Diesel injectors. As the existing ones were in bad shape, we replaced them with new ones.
After this and 50km more, another error occurred saying MAF was within its limits but very high. After cleaning the MAF and testing it for another 50km, the same error came back on.
Replacing the MAF with a new one from Hella and another 100km leaves me with the same error message again.

Anyone experience with this? Thank you very much.
Post #953953 29th May 2022 7:19am
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Doodlefish



Member Since: 18 Nov 2021
Location: United Kingdom
Posts: 54
What is the fault code?
Post #954278 1st Jun 2022 8:22am
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Bantus123



Member Since: 12 Feb 2022
Location: Cataluna
Posts: 3
Spain 
It was the P0110
Post #954286 1st Jun 2022 9:45am
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Doodlefish



Member Since: 18 Nov 2021
Location: United Kingdom
Posts: 54
Okay so I am not sure if the MAF sensor and MAP sensor are separate on the 2.4 as I have the 2.2 which are separate. I changes both sensors. I would advise changing your air filter as well. Once the ECU is clear of the fault code you might find this solves it and its not hugely expensive and easy to do.

You can check out my thread on the issues.

https://www.defender2.net/forum/topic81269.html
https://www.defender2.net/forum/topic81732.html

Good luck.
Post #954288 1st Jun 2022 10:11am
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custom90



Member Since: 21 Jan 2010
Location: South West, England.
Posts: 20453
United Kingdom 
MAF and MAP are separate on the 2.4 also.

Sometimes other things trigger a nuisance MAF code which if I remember rightly that one is.
The EGR is one culprit that has been known to trigger a false MAF DTC.

Do you have a Rai or Snorkel?
If so some people have had false DTC’s with the MAF because of that ongoing and just clear it.
I haven’t with mine but I have heard of it.

Try modding the air box base for better air flow if this is the case, and a new air filter as mentioned and go from there. Also have a quick look at the wiring from the MAF plug. Sometimes the wiring there can break and some people have had to replace it due to this. No Guts, No Glory.
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Post #954314 1st Jun 2022 12:59pm
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Bantus123



Member Since: 12 Feb 2022
Location: Cataluna
Posts: 3
Spain 
Hello again,
in the end we had a look at the EGR and replaced it. Error is now gone for 500km+.

Thank you very much for your help.
Post #958393 15th Jul 2022 6:21am
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MK



Member Since: 28 Aug 2008
Location: Santiago
Posts: 2422
Chile 2007 Defender 110 Puma 2.4 SW Chawton White
Gents

I have no idea regarding the MAF and fuel figures at idle and around 10 Celcius. I am posting a picture of the 2.4, so please jump in if you reckon the airflow numbers look ok. Thx



Click image to enlarge

PS. 23.93 is the last number in case you cannot figure it out. Puma 110" SW

.............................................................
Earth first. Other planets later
Post #1034730 14th May 2024 12:51pm
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andy63



Member Since: 30 Jun 2023
Location: north east
Posts: 532
United Kingdom 
Not sure what your figures relate to..
Your ambient air pressure should relate to about 1 bar (14.7psi)..
At tick over you would see a boost pressure of about 1 psi giving a manifold pressure of about 15/16psi....
The maf at tick over about 16gs..
Your fuel rail pressure of 23MPs would be about right for tick over.. Ie 3300psi
Not sure what the fuel rail sensor voltage is about... 23.93🤔
Post #1034732 14th May 2024 1:12pm
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MK



Member Since: 28 Aug 2008
Location: Santiago
Posts: 2422
Chile 2007 Defender 110 Puma 2.4 SW Chawton White
OK.

According to your suggestions looks the manifold pressure is lower than the atmosheric pressure.

All other figures look ok.

I am having a smoke problem, therefore. It only goes away when the engine is very hot. Not at 50, 70 or 80C, but close to 90C. Puma 110" SW

.............................................................
Earth first. Other planets later
Post #1034733 14th May 2024 1:23pm
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andy63



Member Since: 30 Jun 2023
Location: north east
Posts: 532
United Kingdom 
But what do 88 and 91 referee to.. If its kpa that doesn't make sense.. If 1kpa is about half a psi, or 0.45 psi..
Post #1034735 14th May 2024 1:29pm
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andy63



Member Since: 30 Jun 2023
Location: north east
Posts: 532
United Kingdom 
Sorry.. Just checked.. 1kpa is. 0.145 psi..
Don't know where I got. 45 from😩😂
Post #1034737 14th May 2024 1:32pm
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MK



Member Since: 28 Aug 2008
Location: Santiago
Posts: 2422
Chile 2007 Defender 110 Puma 2.4 SW Chawton White
Right. IIRC the MAP will read less than the actual ambient pressure due to vaccum. Not sure though. Puma 110" SW

.............................................................
Earth first. Other planets later
Post #1034739 14th May 2024 1:43pm
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andy63



Member Since: 30 Jun 2023
Location: north east
Posts: 532
United Kingdom 
I have never seen my boost pressure ie mamifold pressure lower than ambient even on tick over.. There is always a slight increase..
But if you have an active egr system I suppose it may be possible that the electronic throttle will close slightly to aid egr.. And you could see a slightly lower pressure👍
Post #1034743 14th May 2024 2:20pm
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hank



Member Since: 12 Sep 2016
Location: South Wales
Posts: 2301
Wales 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey
Just for absolute clarity which sensor are you referring to?
The one on the airbox or the one just near/beneath the injectors? > 110 XS Double Cab
Post #1034750 14th May 2024 4:13pm
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MK



Member Since: 28 Aug 2008
Location: Santiago
Posts: 2422
Chile 2007 Defender 110 Puma 2.4 SW Chawton White
I am assuming the "Air flow KPA" number, refers to the MAF. Puma 110" SW

.............................................................
Earth first. Other planets later
Post #1034752 14th May 2024 4:19pm
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