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Date Registered: 02-2021
TOTAL POSTS: 25
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posticon T31: O2 and DPF Issues, Torque PID, Stutter Under Acceleration


Hi Guys,
Kind of a rookie here, but very eager to learn!
I have a manual 2009 2.0 diesel X Trail T31 with 275k km. Runs like a charm 😊, best car I’ve had but the DPF is not regenerating anymore.

DPF and O2 sensor issue:
About 2 months ago, I got a check engine light with the code P2A00 (Air Fuel Ratio Sensor Circuit Range/Performance Bank 1 Sensor 1). Didn’t fix it cause our daughter was born and life got busy as f*ck. Shortly after that the DPF light came on. I put STP DPF Cleaner in a half full tank, drove it 30 min at 90 kmh with around 3k rpm and the DPF light went off. About 1 week ago the DPF came on again. Tried DPF cleaner in the tank twice and drove it twice for 40 minutes on the highway, DPF light is still on…..

Just now I learned that DPF regen doesn’t happen if the O2 sensor is faulty (or not if any error code is active??). So I thought I was smart and ordered a OBDII reader (cheap 327 ELM one to be honest) and bought torque pro and the Torque Scan plugin. I deleted the O2 error code P2A00, put STP DPF cleaner in about 40% full tank and drove 40 min with 2.5k rpm. After about 30min the fuel economy got considerably better. Still, the DPF light is on with error code P1435 (failed regen). The O2 error code P2A00 was not active anymore. It’s minus 12 degrees where I live right now, could that keep the exhaust temp too low for regen?

I shut the car off and studied how to use Torque Pro to monitor if the EGR is working, the DPF temp, the exhaust temp and exhaust pressure. But all those sensors don’t deliver any data to Torque Pro. How can I monitor these values of my Xtrail? I can’t find any PID to make it work… I did find the thread of Johnnt with apparently working PID’s but it’s under “administrative review”.
Link to PID Thread

During all the issues with the DPF, the car didn’t loose any power. It revs up very willingly. So I assume the DPF is not fully clogged. Thank god!

I found DYI DPF cleaning kits. It’s chemicals that you spray into the DPF to clean it. Where would I spray that stuff in? Some youtube videos show people spraying it into the hole of a removed DPF sensor (temp or pressure) under the hood, others lift the car and spray it somewhere into the exhaust.
Where is the DPF located in the T31?
DPF Cleaner: DPF Cleaner Instructional Video

Stutter Issue:
For some time my X trail stuttered under acceleration from 2 to 6 gear. It only happens when you push the gas pedal more than about 25% in. The stutter can only be felt through the steering wheel and the gas pedal. The passenger doesn’t feel it. It’s not like the engine stalls, it just stutters while accelerating. After I deleted the O2 sensor error code P2A00 and put DPF cleaner in the tank, I noticed that the stutter disapeared completely. After I shut the engine off and restarted it again 2 hours later, the stutter was back and so was the O2 error code.
 
Can someone help me understand what causes the stutter? Any tips how to fix this O2 sensor issue? Where is that sensor located? Should I replace it or try cleaning it? With what would I clean it?

Here’s my plan:
1. Fix O2 sensor issue.
Question: Where is this sensor and do I replace or clean it?
2. Check OBD if P2A00 (o2 sensor) error disapears or delete it. If issue is solved, proceed to step 3.
3. Spray DPF Cleaner in DPF.
Question: Where is the DPF and where do I spray it in?
4. Delete DPF light and wait a few days to see if it comes on again.
4b. Observe DPF sensors with Torque Pro to see if soot % dropped.
Question: Can someone help me get the custom PIDs from Johnnt?
5. Clean EGR by removing the black plastic cover to clean underneath and by spraying EGR cleaner into inlet.
Question: Do I spray this cleaner from the left side into the throttle control? Marked in yellow?
Image
6. Hoping this saves me lots of $$$

Appreciate your help!
Cheers from Norway emoticon


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Nordic (X-5987)
Located in Norway
2009 T31 Diesel 4x4 Manual
8/Feb/2021, 10:39 am Link to this post Send Email PM   Send Private Message Blog
 
Revhead Kev Profile
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Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 5975
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Re: T31: O2 and DPF Issues, Torque PID, Stutter Under Acceleration


If the EGR is stuck open, then that would contribute to exhaust gasses not reaching high enough temps to complete a DPF regen.
A suggestion is to remove the EGR and make sure it is properly cleaned rather than rely on EGR cleaners in the fuel as they might not fully clean a blocked or stuck EGR.

With 275k kms on the engine it would always be advised to replace the O2 sensor/s instead of cleaning them.

I have now unlocked Johnnt's thread on PID values for you after removing the spam posts.

Last edited by Revhead Kev, 8/Feb/2021, 1:10 pm


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Kev X450(c) T30 Guru
03 Titanium Ti T30 Series 1 **MODIFIED**
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8/Feb/2021, 1:08 pm Link to this post Send Email PM   Send Private Message Blog
 
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Date Registered: 02-2021
TOTAL POSTS: 25
Reply | QUOTE
Re: T31: O2 and DPF Issues, Torque PID, Stutter Under Acceleration


Thanks for unlocking that thread with the DPF PIDs, it's very helful emoticon

I got my hands on a professional diagnostics tool.
It reads the following for the EGR while the car idles:

EGR POS/S VOLT 4.17 V
EGR VALVE POS 0.23 %
EGR/V TRG ANGLE 5.00 %
EGR COOL BYPAS/V ACTIVE

So does this mean the EGR valve was open or closed? What does the EGR Cool Bypas Active mean?I did not get any error code that points toward the EGR.


I wouldn't use an EGR cleaner as fuel additive. I would spray it directly into the intake on the left side of the EGR. So the cleaner hits the EGR directly. Would that be correct?

Last edited by Nordic X, 9/Feb/2021, 10:32 am


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Nordic (X-5987)
Located in Norway
2009 T31 Diesel 4x4 Manual
9/Feb/2021, 10:30 am Link to this post Send Email PM   Send Private Message Blog
 
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Date Registered: 02-2021
TOTAL POSTS: 25
Reply | QUOTE
Re: T31: O2 and DPF Issues, Torque PID, Stutter Under Acceleration


Quick update:
Diagnostics guy had a look at it and told me my DPF is not clogged at all. Told me DPF differential ressure was something around 1 milibar. He thought it was the a/f (o2) sensor that caused all this. They replaced the O2 sensor but the DPF error code didnt disapear and could not be deleted. So they went ahead an did a forced regen..... not too happy about it since it wasnt neccesary. This cleared the DPF Error.

I changed the oil and filter and while reading through the service manual discovered that the "Air Fuel Ratio Sensor Learning Value Clear" should be performed after the a/f sensor or the ECM has been replaced. Otherwise the DPF burns won't happen when they should.

Admin Edit: duplicate question removed but answered in the other thread

Last edited by Revhead Kev, 10/Mar/2021, 9:28 am


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Nordic (X-5987)
Located in Norway
2009 T31 Diesel 4x4 Manual
10/Mar/2021, 7:44 am Link to this post Send Email PM   Send Private Message Blog
 


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