makeitfit
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Faulty mapping ECM
- Thread starter HMLyder
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Help Support Nissan 4x4 Owners Club Forum:
AlexD333
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Oh, so infact nissan know about this mini filter business then 
I'd love to speak to someone in charge of nissan and ask why the mini filter is there. I have spoken with a few people and although I am very keen to remove mine altogether there must be a reason for it.. There must be...
Apart from anything else, nissan wouldn't pay extra for an unnecessary filter as we know they scrimp on costs, even to the point of not putting rubber grommets in chassis holes :augie
I'd love to speak to someone in charge of nissan and ask why the mini filter is there. I have spoken with a few people and although I am very keen to remove mine altogether there must be a reason for it.. There must be...
Apart from anything else, nissan wouldn't pay extra for an unnecessary filter as we know they scrimp on costs, even to the point of not putting rubber grommets in chassis holes :augie
Oh, so infact nissan know about this mini filter business then
I'd love to speak to someone in charge of nissan and ask why the mini filter is there. I have spoken with a few people and although I am very keen to remove mine altogether there must be a reason for it.. There must be...
Apart from anything else, nissan wouldn't pay extra for an unnecessary filter as we know they scrimp on costs, even to the point of not putting rubber grommets in chassis holes :augie
Yes, at least the mechanics know about the filters. But i would presume Nissan self knows about this issue.
The reason for the mini filter is to take up the micro particles that the main filter can take. And if sometimes the main filter burst, the mini filter takes the dirt and seals instead of the dirt going right into the pump.
Dirt in the pump is EXPENSIVE. The mini filter is not so expensive
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Yes, at least the mechanics know about the filters. But i would presume Nissan self knows about this issue.
The reason for the mini filter is to take up the micro particles that the main filter can take. And if sometimes the main filter burst, the mini filter takes the dirt and seals instead of the dirt going right into the pump.
Dirt in the pump is EXPENSIVE. The mini filter is not so expensive
Nice Idea but for the fact this filter is on the outlet/return from the pump, now after the mini filter is a metering orifice with a ball and spring, this seems to regulate the low side pressure in the pump essential for correct operation, so I guess the filter is to stop this orifice getting blocked (by something originating in the pump) but as this orifice is around 1mm in size I doubt this will happen but as this filter is a very fine wire mesh it could clog so causing overpressure, Rick
The banjo the machanic showed me is the inlet from the main filter. The "Workshop 10 pdf" in the workshop download section also show the inlet to the pumpe. The outlet/return is on the backside of the pump.
Is it possible that Nissan have tried several possibilities with the mini filter?
Banshee
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Some interesting questions being flung around here in regards to the min filter. I've seen so many different configurations it's untrue!!!
I've seen lots of Mavs/Terranos that don't even have one so that in itself goes to show that they are not crucial, you'll also find a lot of members on here will have already removed the mini filter and have been running without one for years with no detrimental effects :thumb2
I'd also be pulling the boot floor up and accessing the swirl chamber!!!! Mine was clogged of leaves and conifer needles :doh
Have a look here;
http://www.nissan4x4ownersclub.com/forum/showpost.php?p=259001&postcount=75
I've seen lots of Mavs/Terranos that don't even have one so that in itself goes to show that they are not crucial, you'll also find a lot of members on here will have already removed the mini filter and have been running without one for years with no detrimental effects :thumb2
I'd also be pulling the boot floor up and accessing the swirl chamber!!!! Mine was clogged of leaves and conifer needles :doh
Have a look here;
http://www.nissan4x4ownersclub.com/forum/showpost.php?p=259001&postcount=75
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It varies with the pump you have Zexel it is on the rear Bosch the return is on the front, but I have never seen the mini on the feed, no point the fuel has already been through a much finer filter, so I suspect thea those that have not found one are either looking on the wrong pipe or it has already been removed, Rick
I got the Zexel and have the return on the rear.
I can't see why the minifilter is on the return. That makes no sense.
If the minifilter is on the feed line, it's there to take up particles that gets past the main filter. (Marine engine often have a extra filter before the pump)
That's usually to take up particles if the main filter burst to save the fuel pump. You don't want a lot of dirt in the pump. So why Nissan has chosen to stick a mini filter in the return line is not logical to me.
But i'm going to check the banjo at the return line once more to be sure. Maybe i have overlooked it.
I have probably been a bit hasty here.
I been thinking about this one and i think i know why they put a minifilter in the return to the pump. (Marine engine does not have the same setup)
But there when the diesel goes pressurized from the pump and trough the injectors, there might me some dirt/metal shavings from the system. That is probably the function to the mini filter.
I will try this week and open the return once more a take a better look.
Well.... You guys where right. :bow There was a mini filter inside the banjo at the rear on the pump. So i apologize. I'm a marine mechanic, so there are som things that are quite different.
BUT.. The damn thing didn't help a bit. Same damn problem.
AlexD333
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darn, I was hoping youd say its turned into a rocketship now :doh
next step swirlpot then? (not sure on risks)
I not sure what the swirlpot is for. I hade too google it :thumb2
But i don't think it's the diesel that is the problem.
I found this in Autodata.
If you look at the symptoms, i got it :naughty
But i talked to the lokal Nissan workshop. They never heard of it and couldn't if anything in there system about that problem.
makeitfit
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Light throttle hesitation ! Now if that's at stand still it will happen, it's normal. Is that Auto data referring to live data on a rolling road ?
TPS can give those issues too but I think that shows up on the EML and is coded on the ECU.
TPS can give those issues too but I think that shows up on the EML and is coded on the ECU.
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The ECM I have is clearly marked Bosch and the number is 23710 7f 415, think I would be checking the throttle system, I had a problem with the off road motor a while ago in that it got mud in it and would not return properly, that caused missfire and lack of revs, all I did as an emergency measure was fit another spring to the barrel and have not touched it since as it runs perfectly, Rick
