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jalalski Profile
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Date Registered: 02-2004
Location: SUTHERLAND, SYDNEY
TOTAL POSTS: 29094
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Re: Particulate filter error resulting in MIL light


Dronus,

I have a feeling that it is some sort of a signal/communication failure between the ECU and the DPF which is preventing it from going through the regeneration cycle. If this is the case, then the new DPF will have exactly the same problem after a while.

The dealer needs to establish that the regeneration cycle is actually getting triggered before replacing the DPF and that is why I am assuming they're following the procedure of regeneration instead of just replacing your DPF.

---

30/Dec/2008, 10:00 am Link to this post Send Private Message MSN Blog
 
popeclement Profile
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Date Registered: 07-2008
Location: Perth, WA
TOTAL POSTS: 476
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Re: Particulate filter error resulting in MIL light


I think you are right Jalal - experience suggests it will be the electromechanical interface - ie sensor(s)

John

---
X-916, VW Golf 90TSi manual, limestone grey, no extras
2008 TL dc i, manual, twilight; full set bash plates, jaos strut bar
- traded
30/Dec/2008, 10:16 am Link to this post Send Email PM   Send Private Message
 
dronus Profile
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Date Registered: 08-2008
Location: Adelaide
TOTAL POSTS: 541
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Re: Particulate filter error resulting in MIL light


Howdy John,

The exhaust tail pipe is pretty clean, i just went out and rubbed my fingers around the tail pipe and didn't get any black soot on my fingers. However I got a few strange concerned looks form my neighbor who came out right at the wrong time and saw me sitting behind the car with my fingers in the tail pipe *ahem*... lol....

I haven't noticed any black smoke coming out of the exhaust - i did keep an eye out for it yesterday arvo after your post. Unless there was a lot coming out i probably wouldn't notice it anyway through the tinted windows. I could get someone to drive behind me while i accelerate i guess..

When i was in lakeside yesterday i overheard a conversation between a patrol owner and a service tech. It went along the lines of his fuel consumption being higher after fitting a larger diameter exhaust. The tech explained that unless the exhaust gave an adequate back-pressure to the turbo, the turbo would not spin up properly, which in turn would put more onus on the engine to do the work, resulting in higher fuel usage (amongst other things)
I wonder if the opposite is also correct. If my DPF is blocked (or faulty) resulting in a higher back pressure.. would my turbo be doing more work resulting in lower fuel consumption? 6.3 is pretty low...

Wild stab in the dark there, would value your thoughts.


---
Current - GU Patrol
Old - '08 T31 Platinum TL Diesel Manual - Bells and whistles.
Older - '04 T30 Ti-L Auto
X-966
30/Dec/2008, 10:57 am Link to this post Send Email PM   Send Private Message MSN
 
dronus Profile
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Date Registered: 08-2008
Location: Adelaide
TOTAL POSTS: 541
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Re: Particulate filter error resulting in MIL light


Good Point Jalalski,

I'm guessing that the ECU doesn't log regeneration attempts otherwise they would know that its attempting, and failing. I would have thought that the long run yesterday would have given it ample time to do its thing, and thats why a long run was suggested?

If the service regen needs to be done i guess it needs to be done, i just wanted it logged and acknowledged that any proceedure that results in the engine oil having to be replaced due to the heat generated may cause damage to the engine, and i'd like that noted in the logbook, which they will do, which is good emoticon Especially at 8500km. If the service regen fails i guess we go full circle and they replace the DPF or investigate why its not working. I see both sides emoticon

Techlan won get back to me for a while so ill have a read of the service guide emoticon

Thanks all for your inputs emoticon

Dronus

---
Current - GU Patrol
Old - '08 T31 Platinum TL Diesel Manual - Bells and whistles.
Older - '04 T30 Ti-L Auto
X-966
30/Dec/2008, 11:42 am Link to this post Send Email PM   Send Private Message MSN
 
popeclement Profile
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Date Registered: 07-2008
Location: Perth, WA
TOTAL POSTS: 476
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Re: Particulate filter error resulting in MIL light


DOn't think so Dronus - ie turbo doing more work.

I actually think despite the error logs suggesting blockage, the DPF is working ok if you are not seeing a lot soot behind. However I could be wrong - on my wife's Rexton (yes well she likes it) which has a 2.7 turbo diesel with no DPF, one does notice a lot of smoke under v heavy load - I actually had it dyno'd and it puts out the correct kW/nm but hell that unburnt fuel is just going out the back. The whole idea of the DPF is to cut down this unburnt emission.

Therefore I think your engine is running fine - you have not noticed any drop off in power and driveability except for the electronics inhibiting the cruise.

Still an interesting fault!

---
X-916, VW Golf 90TSi manual, limestone grey, no extras
2008 TL dc i, manual, twilight; full set bash plates, jaos strut bar
- traded
30/Dec/2008, 1:12 pm Link to this post Send Email PM   Send Private Message
 
jalalski Profile
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Date Registered: 02-2004
Location: SUTHERLAND, SYDNEY
TOTAL POSTS: 29094
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Re: Particulate filter error resulting in MIL light


Dronus,

I have read into this a bit further and the entire procedure (including how to initiate regeneration of the DPF by the dealer) is also described here:

quote:


SERVICE REGENERATION
SERVICE REGENERATION : Description INFOID:0000000001530744
Service Regeneration is performed with CONSULT-III to reduce particulate matter in DPF. Service Regeneration
should be performed in the following cases.
• ECM enters fail-safe mode because the amount of particulate matter in DPF reaches the specified level.
NOTE:
When ECM enters fail-safe mode because the amount of particulate matter in DPF reaches the specified
NOTE:
After ECM replacement, go directly to Throttle Valve Closed Position Learning procedure.
Do not perform Throttle Valve Closed Position Learning Value Clear procedure.
level, check whether or not DTC is stored in ECM. In the case of DTC stored, perform the Diagnostic Procedure
for the DTC.
• ECM is replaced.
NOTE:
Based on the signal from sensors ECM measures the amount of particulate matter in DPF and stores the
value in EEPROM (Electrically Erasable Programmable Read Only Memory). When ECM is replaced as
new one, there is a difference between the actual amount of particulate matter and the value stored in new
ECM, because the value stored in new ECM is initialized one. In the case above, ECM can not perform



Image

It clearly states that the ECU adapts to the A/F Sensor 1 to control the regeneration process of the DPF, which means that the dealer needs to trouble-shoot your Air:Fuel Ratio Sensor which may not be giving the correct command to the ECU to start the regeneration process of the DPF and the wrong Air:Fuel ratio could also explain your low fuel reading as it is not being gathered correctly by the ECU.

If your dealer follows the above page exactly, they will find the cause of the problem for sure. All of this should be done under warranty. there is no question about that.

---

30/Dec/2008, 1:18 pm Link to this post Send Private Message MSN Blog
 
dronus Profile
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Date Registered: 08-2008
Location: Adelaide
TOTAL POSTS: 541
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Re: Particulate filter error resulting in MIL light


Jal, wickid, thanks for finding it, very interesting.

-dronus

---
Current - GU Patrol
Old - '08 T31 Platinum TL Diesel Manual - Bells and whistles.
Older - '04 T30 Ti-L Auto
X-966
30/Dec/2008, 1:40 pm Link to this post Send Email PM   Send Private Message MSN
 
dronus Profile
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Date Registered: 08-2008
Location: Adelaide
TOTAL POSTS: 541
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Re: Particulate filter error resulting in MIL light


Just spoke with Lakeside - Nissan TechLan recommend the service regeneration be performed in the workshop. Its pretty much what Jal mentioned about them having to know if the ECU is polling the DPF regeneration. They will know pretty much straight away if it is working when they do it with the consult forcing it on.

The reason why they change the oil and oil filter after doing this process is because fuel can contaminate the oil. This doesnt normally occur when its done automatically. The service regen is being noted in my log book and is being done under warrenty. I will be on about 9000km by friday, so i might aswell book the 10,000km service while im there!

Tim has pulled some strings and booked me in for this Friday morning and they will do it while i wait. He did offer me a loan car but the procedure would have finished before i would have made it home! Once again excellent service.

Ill post back the results.

Happy New year!

---
Current - GU Patrol
Old - '08 T31 Platinum TL Diesel Manual - Bells and whistles.
Older - '04 T30 Ti-L Auto
X-966
31/Dec/2008, 5:20 pm Link to this post Send Email PM   Send Private Message MSN
 
dronus Profile
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Date Registered: 08-2008
Location: Adelaide
TOTAL POSTS: 541
Reply | QUOTE
Re: Particulate filter error resulting in MIL light


I'm on my phone Internet. Been at Nissan for 4 hours now - the DPF regen has failed 3 times while connected to consult.

Something is definately not working properly... Lots of pol scratching their heads.

---
Current - GU Patrol
Old - '08 T31 Platinum TL Diesel Manual - Bells and whistles.
Older - '04 T30 Ti-L Auto
X-966
2/Jan/2009, 11:18 am Link to this post Send Email PM   Send Private Message MSN
 
popeclement Profile
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X-TRAIL FANATIC
 


Date Registered: 07-2008
Location: Perth, WA
TOTAL POSTS: 476
Reply | QUOTE
Re: Particulate filter error resulting in MIL light


Wow - have they suggested any parts replacements yet?

John

---
X-916, VW Golf 90TSi manual, limestone grey, no extras
2008 TL dc i, manual, twilight; full set bash plates, jaos strut bar
- traded
2/Jan/2009, 2:25 pm Link to this post Send Email PM   Send Private Message
 


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