 | Home > Technical > MAF issue one week out of warranty |
 
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| custom90 Member Since: 21 Jan 2010 Location: South West, England. Posts: 20685  
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Also bearing in mind that an EGR with issues can also put the MAF readings out and flag up a MAF fault even though there is no MAF issue only with the EGR playing up causing wrong readings.. I had this happen. TheThunderRollsπ¬π§πΊπΈ
β½οΈπ’οΈβοΈπ§°πͺ |
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3rd Nov 2012 4:00pm |
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| kmac Member Since: 07 Oct 2009 Location: Middlesex Posts: 1314 
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So are you saying I should replace the MAF, the EGR valve or both? |
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3rd Nov 2012 4:10pm |
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| custom90 Member Since: 21 Jan 2010 Location: South West, England. Posts: 20685
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What I'm trying to say is: If your EGR has fault(s) it can sometimes affect the MAF sensor. So if this is the case I would replace the EGR first and leave the MAF. Clear the DTC's and go from there. Worst case scenario is you'll get a MAF DTC again of which then you'll have to replace that too. OR like with me I had both EGR and MAF codes coming up on the system however on good advice I replaced the EGR only and cleared all codes & never touched or replaced the MAF sensor and to this day NO codes or MIL at all. Hope this makes sense..
Steve  TheThunderRollsπ¬π§πΊπΈ
β½οΈπ’οΈβοΈπ§°πͺ |
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3rd Nov 2012 4:34pm |
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| kmac Member Since: 07 Oct 2009 Location: Middlesex Posts: 1314
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Thanks thats clear now.....thinking of putting in one of those EGR blanking plates.
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3rd Nov 2012 4:38pm |
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| custom90 Member Since: 21 Jan 2010 Location: South West, England. Posts: 20685
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You could indeed. If replacing the EGR it's an ideal time to do it.
EGR removed:  Click image to enlarge TheThunderRollsπ¬π§πΊπΈ β½οΈπ’οΈβοΈπ§°πͺ |
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3rd Nov 2012 4:40pm |
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| kmac Member Since: 07 Oct 2009 Location: Middlesex Posts: 1314
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Why would I need to replace the valve if i'm going to fit a blanking plate?
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3rd Nov 2012 4:47pm |
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| custom90 Member Since: 21 Jan 2010 Location: South West, England. Posts: 20685
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Because if your current EGR valve is throwing up DTC's it will still do it blanked or not. So you'd have to fit a new EGR and whilst at it you may as well fit a blank. I could have done with mine but I was more interested in just getting the MIL off and EGR working. Regarding blanking plates there is whole threads on the subject on here. TheThunderRollsπ¬π§πΊπΈ
β½οΈπ’οΈβοΈπ§°πͺ |
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3rd Nov 2012 4:52pm |
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| custom90 Member Since: 21 Jan 2010 Location: South West, England. Posts: 20685
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Info on blanks can be found here in places: a 12mm hole in the blank was a good rough guide.
http://www.defender2.net/forum/topic2227.html TheThunderRollsπ¬π§πΊπΈ β½οΈπ’οΈβοΈπ§°πͺ |
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3rd Nov 2012 4:57pm |
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| kmac Member Since: 07 Oct 2009 Location: Middlesex Posts: 1314
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Thanks, will monitor it and try and narrow down where the fault is. EGR valve seems to be circa £125 where a new MAF is about £40 Last edited by kmac on 3rd Nov 2012 5:11pm. Edited 1 time in total |
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3rd Nov 2012 5:05pm |
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| custom90 Member Since: 21 Jan 2010 Location: South West, England. Posts: 20685
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I know a Pain in the a... it is. I luckily managed to get the last of the old stock EGR's at £92 but I was lucky they went up to the price you mention just in the last 6 weeks / month.
 TheThunderRollsπ¬π§πΊπΈ
β½οΈπ’οΈβοΈπ§°πͺ |
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3rd Nov 2012 5:08pm |
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| Lorryman100 Member Since: 01 Oct 2010 Location: Here Posts: 2686 |
The above DTC's are common untested DTC's with the exception of 167B - 41 Fuel injector learning not done missing CAN signal high/low switch How does the Puma run at tickover and does it feel lumpy at low revs? Below is a copy of some DTC's that log often on my Puma without the MIL lighting. NANOCOM - PUMAENG.APP - PUMA ENGINE fault file 0404 - 72 Exhaust gas recirculation (EGR) control circuit range/performance actuator stuck open --- 0299 - 00 Turbocharger A under boost condition --- 1103 - 00 Mass air flow (MAF) sensor in range but higher than expected --- 0404 - 73 Exhaust gas recirculation (EGR) control circuit range/performance actuator stuck closed --- 0234 - 00 Turbocharger A over boost condition --- 1402 - 17 Exhaust gas recirculation (EGR) control valve metering orifice restricted circuit voltage above threshold --- The first thing I would do is clear the faults and then start the engine and go for a two minute drive. Then recheck for any DTC's that are logged. If P167B - 41 is relogged then have a pilot correction learn done. As to the MAF sensor, at £35 I would just replace it and coat the plug in electrical contact cleaner before connecting. If the EGR is not noisy and you can hear the 5 x chukka chukkas at shut down then I would say there isn't an issue with the EGR. If the EGR valve takes longer to open than the stored values within the Fuel file in the EMS then it will log a untested DTC (No Mil) then after 40 consecutive driving cycles without the fault reoccurring the DTC will be cleared. If the EGR fails the self test cycle then it will log a tested DTC. The problem with the nanocom is that it logs both types without differentiating between the two which does lead owners to be convinced that a part is faulty when it is fine. Only time spent monitoring the Puma over a few weeks will give you a feel of what to ignore and what is the problem. I have an IDS system as well and the fast idle test would tell me straight away if the MAF or EGR was at fault so if it is still in warranty get it into the dealers to fix.
HTH Brian. |
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3rd Nov 2012 5:48pm |
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| kmac Member Since: 07 Oct 2009 Location: Middlesex Posts: 1314
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" If P167B - 41 is relogged then have a pilot correction learn done" eer what's that and how do I do that please?
Did feel a bit rough at low revs. Went for a drive, will check now if the faults re-occur Sadly as per title of thread was only one week out of warranty when issues came up |
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3rd Nov 2012 6:29pm |
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| kmac Member Since: 07 Oct 2009 Location: Middlesex Posts: 1314
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NANOCOM - PUMAENG.APP - PUMA ENGINE fault file
167B - 41 Fuel injector learning not done missing CAN signal high/low switch --- 0100 - 64 Mass or volume air flow A circuit signal plausibility failure --- 0404 - 73 Exhaust gas recirculation (EGR) control circuit range/performance actuator stuck closed --- MIL came on again |
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3rd Nov 2012 6:41pm |
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| Lorryman100 Member Since: 01 Oct 2010 Location: Here Posts: 2686 |
How is the EGR sounding, does it do the 5 x chukka chukkas at shutdown? Can you hear strange scrapping sounds when driving? If you could answer these questions first to discount the EGR as the problem, as the last DTC said the valve was stuck open!
That then leaves two issues logged in the EMS. The first is the injector re learn or pilot correction learn, there is a 16 digit hex code printed on each injector. These are the machined tolerances of that particular injector. Machining tools wear with use and the tolerances on an injector are tight so the hex code tells the EMS the particular tolerances for that injector e.g. opening times, shutting times and these injector characteristics vary with fuel rail pressure. The process allows the EMS to learn these injectors, the EMS learns in increments to get the correct values to get the engine firing smoothly. The nanocom is not capable of doing this so you will need a dealer level diagnostic tool to do this properly ie: BBS MSV2, IDS, Omitec, Autologic or Symptom Driven Diagnostic (SDD). I would change the MAF first as it is the cheapest part and will discount that being the problem DTC. I would also be putting a DMM on the female plug to check voltages to ensure it is not a wiring issue (the Puma electrical diagram gives outputs/inputs voltages for the MAF on the EMS side). HTH Brian. |
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4th Nov 2012 6:00pm |
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