 | Home > Puma (Tdci) > P1103 MAF in range but higher than expected - translation? |
 
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| Kez Member Since: 11 Apr 2011 Location: UK Posts: 271  
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Hi all, in the last three weeks (ie since i bought t) I have had a P1103 code come up, first time local garage checked and said it was the MAF and nothing serious, just reset it, and again just now (this time I reset it myself). Its 'only' done 35k so surley cant be that knackered already (or can it
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My question(s) are what is a Mass Air Flow thing, and what does it do. I am assuming it measure air coming into engine but thats just an uneducated guess. If it is higher then expected, what are the implications etc etc - as you can see I am not technically minded so please keep any replies suitable for half wits such as yours truly! Cheers Kerry |
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3rd May 2011 3:07pm |
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| Kez Member Since: 11 Apr 2011 Location: UK Posts: 271
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Cheer Russell, notice that the unit is actually just a (simple to replace) insert so just have to find someone who can supply one at a sensible cost
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3rd May 2011 3:54pm |
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| Lorryman100 Member Since: 01 Oct 2010 Location: Here Posts: 2686 |
Has the MIL light illuminated? P1103 is a common untested DTC which comes up quite often when checking the dtc codes. The MAF sensor sits in the air inlet manifold and lets the ECU know how much air is entering the engine so it can meter out the required fuel/air mix. The MAF sensor is a hot wire sensor meaning that the ecu sends a voltage to the Maf to heat the wire to a known temperature. As air passes over the wire it naturally cools and more voltage is sent to the MAF to keep the wire at the set temperature, this difference in voltages is what the ecu uses to determine how much air is entering the engine.
 Click image to enlarge Click image to enlarge The MAF sensor is held in place by 2 screws and it is just a case of removing the plug and undoing the screws and lifting the MAF straight out. When replacing a new sensor it is important that it is put in the correct way round. There is an arrow to show air flow direction. Click image to enlarge A symptom that the MAF sensor is failing is higher fuel use. The sensor can be back probed to check the current being used. I have been meaning to do a write up on this as I have recently purchased a new fluke automotive handheld oscilloscope along with some other bits and pieces so I will hopefully be doing this shortly, if anyone is interested? The MAF sensor is available from the LR parts department for about £35 and the dealer will only swap it out if it shows up as a fault on IDS. If in doubt just replace it yourself as it isn't a hard job to do, and the savings in fuel would pay for itself long before LR swap it out. 
HTH Brian. |
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3rd May 2011 4:01pm |
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| Kez Member Since: 11 Apr 2011 Location: UK Posts: 271
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Thanks Lorryman100, that very helpful and informative - as they say a picture is worth a thousand words.
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3rd May 2011 4:25pm |
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| mse Member Since: 06 Apr 2008 Location: UK Posts: 5038  
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Kez - do a search for a post from me around Feb this year - i outline all of the above and what appeared to be linked faults...i may even suggest i started the faulty/not faulty MAF trend.
Basically you MAF can be faulty, but not broken and thus work, with rubbish performance - so you get shoddy performance as it onwardly triggers other faults such as turbo and egr...all withouth the MIL coming on Mike |
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3rd May 2011 4:58pm |
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| Kez Member Since: 11 Apr 2011 Location: UK Posts: 271
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Cheers Mike, well given the cost of fuel changing it for a new OEM one sounds more like a no brainer to me ?
If anyone knows the relevant part number for the bit I would be most grateful |
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3rd May 2011 5:35pm |
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| mse Member Since: 06 Apr 2008 Location: UK Posts: 5038
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You should be able to get it a little less an £30
MHK501040 is the p/n Mike |
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3rd May 2011 6:03pm |
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| Kez Member Since: 11 Apr 2011 Location: UK Posts: 271
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Thanks again MSE, appreciate that
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3rd May 2011 6:04pm |
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| Caterham Member Since: 06 Nov 2008 Location: Birmingham Posts: 6300  
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I can't quite put my finger on it but suspect my MAF might be playing up so for £30 I'm gonna give it a go and if it sorts things I'll try and get a new one or refund retrospectively.........
anyway I'm wondering how many (if any) of these electrical related and intermittent faults might be due to the wiring loom - its just that I personally think the quality of it is shocking.... but then what do I know? could it be? and does Pete have any conclusive results to his survey on MAF's ? |
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5th May 2011 12:15pm |
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| Caterham Member Since: 06 Nov 2008 Location: Birmingham Posts: 6300
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sorry but whats OEM
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5th May 2011 12:18pm |
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| mse Member Since: 06 Apr 2008 Location: UK Posts: 5038
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original equipment manufacture
The MAF sensor, due to how it works, is sensitive. Errors logges through connectors are very likely to be wiring loom related faults i would imagine if current difference is marked where is measures small changes - if that makes sense Mike |
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5th May 2011 1:07pm |
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| BigMike Member Since: 13 Jul 2010 Location: Lancashire Posts: 2253
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You're also likely to get this if you have a raised air intake. The longer pipe speeds up the airflow over the sensor.
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5th May 2011 1:23pm |
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| mse Member Since: 06 Apr 2008 Location: UK Posts: 5038
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Are you sure - i didnt get it on my new MAF and the the positive ram affect of a safari, being a good effect, i wouldnt have thought would make any negative affects as its only pushing more air through and the MAF will read an increase air flow, not miss read the airflow - which is the problem Mike |
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5th May 2011 4:43pm |
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| BigMike Member Since: 13 Jul 2010 Location: Lancashire Posts: 2253
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Yes I'm sure. The sensor detects an increase in airflow over the normal parameters. Ironically this was one of things I discussed with the head of service at hillendale this morning. I asked him and he said that in his experience virtually vehicles with a mantec (ie oem) RAI show the fault at one point or another.
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5th May 2011 4:54pm |
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