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Northern lad



Member Since: 17 Mar 2024
Location: Saddleworth
Posts: 18
Scotland 2009 Defender 110 Puma 2.4 DCPU Keswick Green
Defender TD5 2009 Power loss
All,

Have a TD5 that I have a difficult issue to trace. It has lost power, I think loss i of the turbo kicking in although all the Nanocomm readings seem to lead me to think MAF fault.

Have changed the MAF and MAP, plus AAP sensoes but no change. On the Nanocomm I found that the Air flow (g/s) setting sits at 4.0 g/s and does not move, (on stop, idle or reving). Have checked the three pin plug with a multimeter and over pin 1/3 (12v feed to earth) good readings. Pin 2/3 reads 0.2v and increases to 0.3v on reving. Pin 3 earth reading 0.65 - 1 as good as full continuity) Removing plug makes no difference to engine performance.

Also no fault codes listed. Although it has been sat a while, (battery flat, now recharged).

Only thoughts....

- Change MAF (done - britpart one)
- Faulty wiring
- ECU fault
- Fuse or relay fault, (although all checked)

Any thoughts, am I missing something
Post #1055856 29th Dec 2024 7:03pm
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TexasRover



Member Since: 24 Nov 2022
Location: Paris
Posts: 1182
France 2002 Defender 110 Td5 DCPU Chawton White
So you changed the MAF and the reading is not charging? Sounds like the MAF is no good, which from what I understand is a common issue with aftermarket cheap units.

But the MAF is not doing much on the Td5. Probably more likely a turbo pressure issue, or many things combined
Post #1055858 29th Dec 2024 7:22pm
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Northern lad



Member Since: 17 Mar 2024
Location: Saddleworth
Posts: 18
Scotland 2009 Defender 110 Puma 2.4 DCPU Keswick Green
Thought about another MAF. However triedanother working one and no change. Also the voltage readings were from when the three pin plug was disconnected as well as connected. Turbo pressure lifts when the engine takes load. Photos taken at idle.
Post #1055869 29th Dec 2024 9:12pm
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Newlandy



Member Since: 01 Apr 2024
Location: Gauteng
Posts: 9
South Africa 2003 Defender 110 2.5 TD CSW Arles Blue
I had a similar intermittent problem. I found that the wiring from the AAP sensor had frayed inside the black cable covering, not sure what it's called. I peeled it all the way back to where the MAF wires join the loom and fixed the wiring. Problem solved.
Post #1056042 1st Jan 2025 4:50am
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Hazza



Member Since: 10 Jan 2011
Location: North Yorkshire / Leeds
Posts: 222
United Kingdom 1990 Defender 110 Td5 HT Bronze Green
Have you got continuity between MAF plug and the ECU plug (pin 20 on the red connector)?

If the MAF reading isn't changing from 4 then the issue must be MAF or its wiring. Faulty MAF does make them feel gutless. 1990 Defender 110 200TDI Camper - now converted to Td5 power
Post #1056106 2nd Jan 2025 1:09pm
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Northern lad



Member Since: 17 Mar 2024
Location: Saddleworth
Posts: 18
Scotland 2009 Defender 110 Puma 2.4 DCPU Keswick Green
Thanks Hazza, next task. Have been busy with work when I get a minute. Will let you know how I get on.
Post #1059405 3rd Feb 2025 5:27pm
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andylee



Member Since: 29 Jun 2016
Location: South East
Posts: 98
United Kingdom 
Probably worth double checking all the intercooler hoses and fittings and check the intercooler itself hasn't split...
Post #1059968 8th Feb 2025 5:07pm
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4RF RDS



Member Since: 19 Jul 2015
Location: Ottawa
Posts: 965
Canada 2000 Defender 110 Td5 XS CSW Epsom Green
Check that the turbo waste gate is not seized.

Good luck 2010 Range Rover MkIII Autobiography Super Charged (Idris)
2003 Range Rover Mk III (Desmond FitzWilliam)
2000 Defender 110 CSW TD5 (CTX)
1992 Range Rover Classic (Lizzy)
1972 Series III 300 Tdi (Stanwood)
1967 MGB GT

Every normal man must be tempted at times to spit on his hands, hoist the black flag, and begin to slit throats.
H. L. Mencken (1880 - 1956)
Post #1060069 9th Feb 2025 7:46pm
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jim4244



Member Since: 13 Apr 2014
Location: Bedfordshire
Posts: 873
England 2007 Defender 90 Puma 2.4 CSW Zermatt Silver
I have to ask - Do you have a Defender Puma with a TD5 engine installed or the standard 2.4 Ford Puma engine?

Jim
Post #1060084 10th Feb 2025 4:08am
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bankz5152



Member Since: 02 Feb 2017
Location: South London/North Kent
Posts: 2200
2004 Defender 110 Td5 DCPU Epsom Green
If you have a nanocom you can download the ROW spec maps from Empire Tunings website which removes the MAF sensor. Its a poor and expensive sensor that isnt needed. IF this is a TD5 that is.

It should run better with it disconnected. If there is no change with it disconnected then your problem isnt the MAF sensor. Instagram @defender_ventures
Empire Tuning - Agent
Post #1060113 10th Feb 2025 12:28pm
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