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Old 12-07-2012, 09:54 AM   #11 (permalink)
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That's correct it's an all in one unit, you can do a forced regen if they've got the correct software, if your going to buy a new DPF unit, don't go to Mazda it's cost over 1200!! you can buy them for around 300 on ebay with a warranty. The DPF system will need resetting after this has been done.The other option is to have it removed and find a firm that use emulators to fool the ECU, don't go anywhere near people who claim they can alter the ECU by deleting files or reprograming it, they don't work.

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Old 12-07-2012, 11:15 AM   #12 (permalink)
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Thanks Dave, will probably keep DPF.

Was quoted 350 + labor, will be ready to collect tomorrow morning.
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Old 12-08-2012, 08:29 AM   #13 (permalink)
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DPF replaced and car pulls nicely and no more hissing.

I was also advised to replace rear silencer as soon as possible too. Apparently all the waste from the old DPF that's gathering inside rear silencer can come back into the new DPF/Cat converter. Is this true?
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Old 12-08-2012, 08:55 AM   #14 (permalink)
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Not possible if the DPF was blocked, the DPF collects the soot then burns it off, when it's full or blocked gases can't pass through it or any soot.
The only time you might find a restriction in the back box is if the cat or DPF has destroyed itself and the bits have got stuck in the back box, you'll normally hear them rattling about.
Gas flow from the DPF is one way the engine can't suck any waste back into the system.

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Old 12-10-2012, 09:30 AM   #15 (permalink)
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That's what the mechanic said. Apparently DPF/Cat was completely destroyed and bits were loose inside rear silencer. Getting it replaced today.

Next thing on the list is fixing oil leak near crankshaft/cambelt area

Appreciate your comments Dave!
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Old 12-11-2012, 04:26 AM   #16 (permalink)
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I bet they could have just shacken the bits out, and from what you've said about the performance after the repair i doubt it's broken up, if it had blocked the rear box the performance would not improve! personally i would have asked for my old dpf unit back, several reason why, first to see if it was blocked or broken up, you would have a DPF unit that could be modified ready for a DPF removal, and they're also worth a few quid as scrap!.
The oil leak could be a few things, main crankshaft oil seal,sump seal may have failed, Mazda use instant gasket on the sump no paper/cork gasket, they've been know to weep, if it is the sump whilst it's off check the oil pick up/strainer is nice and clean, they can get blocked over time which is'nt good for the engine or turbo.

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Old 12-21-2012, 07:50 AM   #17 (permalink)
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Mechanic brought old DPF unit out to show me. I didn't have a clue what to look out for so just nodded and said they could dispose it for me. Live and learn

I took the car to another garage to fix the oil leak and it turned out to be camshaft seal (they replaced crankshaft seal too). He also changed rear silencer, serviced the car for me (oil, filters, cambelt etc..) and run diagnostics.

He warned me that the engine compression was low and suspected worn pistons.
After asking about power loss he advised me to contact Mazda or diesel specialist as he did not want me to run into 1000s of pounds as the only way to try and resolve this issue with him was by trial and error.

Car diagnostics showed a number of errors.
These were:
C1119 (TCS transfer input signal failure)
B1318 (Battery voltage low)
P242F DPF Ash accumulation
P2453 Particulate matter trap differential pressure sensor circuit range/performance
P2458 DPF Regeneration Duration


So he cleared all errors saying that they could have been fixed but not cleared. Then he rerun diagnostics and only two remained
P242F DPF Ash accumulation
P2458 DPF Regeneration Duration

Car is still sluggish even after 300miles of motorway driving.

Does ECU need resetting after DPF replacement?
Why am I not getting any DPF signs on my dashboard?
Could improper DPF replacement (not resetting ECU) still affect performance?
Could engine compression be affected by DPF issues?

I am also considering buying WYNSS EGR cleaner and trying to clean EGR to see if it helps with performance.

Thanks.
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Old 12-22-2012, 08:02 AM   #18 (permalink)
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If you had worn pistons or rings the car would burn oil and also smoke alot, i bet they've not done a compression test to rule that out, i very much doubt it's a compression problem.
The ECU needs to be reset after a new DPF is fitted and all codes cleared, the link below shows you what should be done
https://euroesi.mazda.co.jp/esicont/...6f1805100.html

and a list of DTC's
https://euroesi.mazda.co.jp/esicont/...2f1801500.html

Dave
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Old 12-23-2012, 04:42 PM   #19 (permalink)
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Thanks for the links and advice.
Could not find what needs to be done after dpf replacement though and having read about dpf auto regen been blocked if particular codes are not cleared is worrying me. Don't want to block newly replaced dpf.
What's the cheapest diagnostic tools I can buy that will let me do dpf regen / reset etc..? Or do I have to take to Mazda dealer?
I have seen Mazda IDS CDs on eBay , will these work with something like ELM327 obd connectors?
The first link mentions how to do manual dpf regeneration without m-mds but from the diagram I can't figure where TEST terminal is located exactly.
Thanks.
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Old 12-28-2012, 07:12 AM   #20 (permalink)
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Sorry for the delay, been laid up with that nano virus thing.
After a new DPF is fitted you need to clear all DTC's the link below tells you how
https://euroesi.mazda.co.jp/esicont/...2f1801100.html

i've not had any dealings with any of the ebay stuff, i would contact the seller and ask if the software would run with the eml327.
The test teminal is on the passanger side of the car under the bonnet near the front, it's inside a black plastic box, iirc it's near the front (head is'nt in gear at the moment), the link below show you what it look like.
Tips and Tricks for MAZDA 6 (GH) 2.0D MZR-CD (RF-Turbo) 2007 - 09. - www.cdn.dk

Dave
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