SCR CLOSED LOOP CONTROL AT MAXIMUM LIMIT DEF quality low fix on 2017 freightliner DD15 engine
ฝัง
- เผยแพร่เมื่อ 6 ส.ค. 2023
- Buying a extra OUTLET Nox sensor (Grey wire) fixed my issue. Additional sensor serves as a bypass sensor.
(NOTE) there were no other known issues with aftertreatment system that contributed to fault alarms. Be sure to check you DEF concentration %.
Sensor cost a little over $500. Worked great for me and hopefully can help you too. I performed a regen after installing bypass sensor. All numbers were in spec.
Highly recommend having DDDL software to properly diagnose issues and check parameters.
This video link listed below helped me initially to troubleshoot my issues but after following steps issue returned quickly which led me to bypassing as mentioned in my video. Check it out for better insight in why you may have similar symptoms.👇🏾👇🏾
• SCR closed loop - ภาพยนตร์และแอนิเมชัน
Much appreciated and thank you for your help!
Thanks!!!!
Yes worked for me also going on 2 years.. LET THE SENSOR SMELL FRESH AIR.
Thank you brother, for the informative video.
Is it OK to replace the Nox sensor first, then proceed to doing the efficiency test? Or it's better to do the test first, then replace the sensor?
I did not replace nox sensor. Original sensor is left in place to seal exhaust. New sensor will be connected to factory wiring and placed in a safe location outside the exhaust. Efficiency test can be ran before. I suggest regen after installing new sensor to make sure no new error codes related appear.
Yes brother, I believe I understand what you mean.
You only removed the connector from the old sensor and plugged it into the new one, and left the other end that screws into the exhaust intact. Am I correct?
@@plurouno5394 yes that is correct
@@themillennialtrucker5243
Hi bro,
I need help once more. What cable do you use to connect the laptop to the truck?
@plurouno5394 Diesel Laptops Nexiq USB Link 3 Wired Edition with Repair Information & Diagnostic Software a.co/d/8fJkfHy
May be able to find something cheaper but this is what I have. Well worth investment. Comes with software but I use the DDDL. Much easier and precise in my opinion.
Is this the same as the adblue/def metering control in closed loop? Can I use this same method
Unfortunately I am not familiar with that fault
When you do this do you sill have codes but no derate? and do you run anything in dddl? i did this and it started derating in half the time as properly installed.
No. Prior to install I had no other faults. I also made sure fault that caused this particular derate was cleared before install. I did not modify anything on ecm while connected to DDDL. Have not had any faults since. Did you clear derating fault prior to install?
To clear fault prior to install you must run regen followed by efficiency test..may take several hours. Once fault is cleared you can install sensor. I also ran a regen following install for good measure and confirmed all numbers were in spec.
@@themillennialtrucker5243 does your 1box have soot sensor in front of nox outlet?
@@lasher11111 yes
I mean, doesnt the temp matter? Will it not throw another code because the temp is waaay off?
It will not (has not in my case) thrown any codes. The nox sensor does not measure temp.
Much appreciated for the video
Would this help solve the engine code
spn 520372 fmi 16
It’s lSelective Catalyst Reduction Closed Loop Control at Maximum Limit” but without the low DEF Quality
I only have the MIL light on with this code and everything else runs fine
I have heard that this can be a pain to gen rid of
Appreciate the help 👍
It's has been awhile since I had this issue. I don't remember codes but it is definitely worth a try. I still have not had any issues since
So let me get this straight.
You performed SCR efficiency test before installing the new sensor. The code cleared. So you then installed the new sensor and everything is fine.
Yes...I would get the fault code causing derate numerous times. The efficiency test has to be performed to clear that particular fault but after a few runs the fault and derate would return. By installing sensor after the fault has been cleared has resulted in fault not reappearing for me as of today.
@@themillennialtrucker5243 thank you for the reply. If you want to stop using def you might could plug the hose or crimp it with vise grips. Assuming it is still spraying def?
@jared6356 I did not modify aftertreatment system or delete aftertreatment. Sensor install only bypasses nox output reading. You will still have to maintain truck fluids and maintenance as normal.
@@themillennialtrucker5243 the problem with this is the word test but in fact it is a calibration.
@@lasher11111 correct.
Does this really work?
Haven't had issue since..still running fine, no more faults
I've had 5 scr loop closed at maximum limit 5xs since July. Have warranty coverage on mine, and they won't help me fix it. How many miles have you ran? Thank you for the information, I appreciate it.
@user-mz3pj3cp5p truck had about 590,000 miles on it. Currently at 615,000 and fault hasn't popped up since I did what I mentioned in video. But scr closed loop was only fault that I had appearing on truck. If you have other aftertreatment faults you may need to address those.
Only code is s loop closed at maximum limitl. I have a 2018 dd15 with 590,000.
@user-mz3pj3cp5p sounds like you have same issue then. It was best thing I could have done! $500ish for oem sensor is expensive but much cheaper than alternative options and results have been well worth it.