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simon.foster



Member Since: 21 Nov 2015
Location: South Devon
Posts: 19

United Kingdom 2015 Defender 110 Puma 2.2 XS CSW Alpine White
P0100-36 Fault Code
My 65 plate Landie 110 went into fault mode on Saturday and first suggestion was a faulty Mass Airflow Meter. Land Rover Assistance who were great and suggested that this code is rarely an MAF fault and is more commonly an issue elsewhere. In my case the dealer identified water in the air intake system as it was missing an essential seal and it had caused a sensor to be damp. The fault code was still there. They eventually located it to the wiring to the MAF sensor that had worn through and was shorting. This may require a new loom! Just thought I would mention it to those who have repeating MAF fault codes occurring. '65' plate Defender XS 110 Station Wagon
'16' plate Mini Clubman Cooper SD
'15' plate VW E-Golf
Post #510160 2nd Mar 2016 10:07pm
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Supacat



Member Since: 16 Oct 2012
Location: West Yorkshire
Posts: 11018

United Kingdom 2013 Defender 110 Puma 2.2 XS DCPU Keswick Green
I can see that from a tech's point of view, it's easier to change the item than look for a wiring loom fault but the Workshop Manual has the fault finding the other way around:

DTC
P0100-36

Description
Mass or Volume Air Flow Sensor "A" Circuit - signal frequency too low

Possible Causes
NOTE: - Circuit FMAF -

* Frequency mass airflow sensor circuit, short circuit to ground, short circuit to power, open circuit, high resistance

* Frequency mass airflow sensor internal failure

Action
Refer to the electrical circuit diagrams and check the frequency mass airflow sensor circuit for short circuit to ground, short circuit to power, open circuit, high resistance. Repair the circuit as required, clear the DTC and retest the system.

If the fault persists, check and install a new frequency mass airflow sensor as required. Refer to the warranty policy and procedures manual, or determine if any prior approval programme is in operation, prior to the installation of a new module/component.
Post #510276 3rd Mar 2016 11:05am
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ian series 1



Member Since: 17 Nov 2014
Location: south
Posts: 3127

United Kingdom 2008 Defender 90 Puma 2.4 CSW Bonatti Grey
A common one on the Puma fitted engine.

99% of the time it's one of two wires that rub through on the main loom from engine to ECU.
Transits suffer badly from this, I only did one last week.

If it is the wires?
it's fairly easy to test and locate the break, and a simple fix... Wink 80" 80" 86" 88" 90"

Wanted, Forward Control Anything considered.
Post #510283 3rd Mar 2016 11:20am
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simon.foster



Member Since: 21 Nov 2015
Location: South Devon
Posts: 19

United Kingdom 2015 Defender 110 Puma 2.2 XS CSW Alpine White
Well they tell me they have repaired it, which I assume has not required a replacement loom. I would be intrigued to know where it exactly had worn through '65' plate Defender XS 110 Station Wagon
'16' plate Mini Clubman Cooper SD
'15' plate VW E-Golf
Post #510307 3rd Mar 2016 11:58am
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Supacat



Member Since: 16 Oct 2012
Location: West Yorkshire
Posts: 11018

United Kingdom 2013 Defender 110 Puma 2.2 XS DCPU Keswick Green
Can't hurt to ask them to show you the repair and ask what parts they have used?

Also, if it's worn through the loom once, have they done anything extra to prevent the fault happening again?
Post #510343 3rd Mar 2016 1:05pm
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ian series 1



Member Since: 17 Nov 2014
Location: south
Posts: 3127

United Kingdom 2008 Defender 90 Puma 2.4 CSW Bonatti Grey
If they had found a fault in the loom it would be very easy to spot.
Look for new cable ties, fresh loom tape, or electrical tape.

Usually they break in the largest part of the loom around the top of the engine.
So you have to open it right up to find the wires.

If it has been done like they say, you will see evidence... 80" 80" 86" 88" 90"

Wanted, Forward Control Anything considered.
Post #510347 3rd Mar 2016 1:13pm
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Tumbiri



Member Since: 01 Nov 2016
Location: Caribbean
Posts: 52

2013 Defender 110 Puma 2.2 XS CSW Orkney Grey
2013 110 PUMA 2.2

Have had several MAF faults. When the vehicle was still relatively new, I noticed that the insulation on each of the four wires of the MAF sensor is cracked and the bare wires are exposed just where the the wires enter the connector. See photo. At the time I put it down to poor wokmanship and didnt dwell on it for long. I'm guessing now that this may be the cause of the faults I'm seeing (tracking between conductors perhaps?).

On the last occasion, the engine went into limp mode and the engine light came on. I moved the harness and on the next start everything returned to normal (no warning light, no limp).

Would you know if it is a simple task to remove/install the wires in the connector? There may be enough slack in the harness to allow me to reterminate the harness.

Do you know the PNs for the connector alone and for the complete harness? Thank you.

Click image to enlarge
Post #860848 10th Oct 2020 3:42pm
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Race.it



Member Since: 27 Aug 2019
Location: Algeciras
Posts: 739

Spain 2010 Defender 110 Puma 2.4 SW Alaska White
Think Martin sells that in the defender2 store the connector. Searching for my first Defender...and started just as Covid hit, so talk about timing.

5 months after starting the search I found it, and here is the details
Post #860857 10th Oct 2020 4:05pm
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Race.it



Member Since: 27 Aug 2019
Location: Algeciras
Posts: 739

Spain 2010 Defender 110 Puma 2.4 SW Alaska White
http://www.disco4.com/shop/defender-puma-t...-p110.html Searching for my first Defender...and started just as Covid hit, so talk about timing.

5 months after starting the search I found it, and here is the details
Post #860858 10th Oct 2020 4:07pm
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LandRoverAnorak



Member Since: 17 Jul 2011
Location: Surrey
Posts: 11240

United Kingdom 2013 Defender 110 Puma 2.2 USW Orkney Grey
I did this repair a few weeks ago with a pre-wired plug from Martin. Details here:

https://www.defender2.net/forum/post853238.html#853238 Darren

110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak

"You came in that thing? You're braver than I thought!" - Princess Leia
Post #860874 10th Oct 2020 4:55pm
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Tumbiri



Member Since: 01 Nov 2016
Location: Caribbean
Posts: 52

2013 Defender 110 Puma 2.2 XS CSW Orkney Grey
Thanks Race.it, thanks LRA! Great information. Appreciate it. Do you have a PN for the pre-wired connector?
Post #860907 10th Oct 2020 7:47pm
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LandRoverAnorak



Member Since: 17 Jul 2011
Location: Surrey
Posts: 11240

United Kingdom 2013 Defender 110 Puma 2.2 USW Orkney Grey
They're made up by forum owner, Martin. Here's the link to the site shop page:

http://www.disco4.com/shop/defender-puma-t...s-p98.html Darren

110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak

"You came in that thing? You're braver than I thought!" - Princess Leia
Post #860913 10th Oct 2020 9:01pm
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