Exhaust Fluid Quality Poor
37.8 هزار بار بازدید -
2 سال پیش
-
2012 Chevrolet 3500 6.6L Duramax
2012 Chevrolet 3500 6.6L Duramax Diesel
EXHAUST FLUID QUALITY POOR
I determined that the downstream NOx sensor was bad. When you're driving and take your foot off the accelerator after moderate acceleration, both NOx sensors should drop to 1 or 0 while the fuel is cut off. The downstream sensor was stuck at 14 or 15 ppm. After replacing the NOx sensor, I had to do a reductant fluid quality test. The instructions on my scanner were wrong for the exhaust fluid quality test (RFQT). The ECM won't start an RFQT unless the NOx sensors have been warmed up and are sending good data. If the computer won't run the test and the exhaust is completely warmed up, then try a two minute key off before re-trying.
The fix was running a manual DPF regen, followed by the RFQT (reductant fluid quality test). If the reductant quality has been running for an hour, then it probably won't finish.
Related documents:
GM Service Information document ID 2522607.
GM Service Bulletin PIP5007E https://static.nhtsa.gov/odi/tsbs/201...
GM Service Bulletin PI1214A.
EXHAUST FLUID QUALITY POOR
I determined that the downstream NOx sensor was bad. When you're driving and take your foot off the accelerator after moderate acceleration, both NOx sensors should drop to 1 or 0 while the fuel is cut off. The downstream sensor was stuck at 14 or 15 ppm. After replacing the NOx sensor, I had to do a reductant fluid quality test. The instructions on my scanner were wrong for the exhaust fluid quality test (RFQT). The ECM won't start an RFQT unless the NOx sensors have been warmed up and are sending good data. If the computer won't run the test and the exhaust is completely warmed up, then try a two minute key off before re-trying.
The fix was running a manual DPF regen, followed by the RFQT (reductant fluid quality test). If the reductant quality has been running for an hour, then it probably won't finish.
Related documents:
GM Service Information document ID 2522607.
GM Service Bulletin PIP5007E https://static.nhtsa.gov/odi/tsbs/201...
GM Service Bulletin PI1214A.
2 سال پیش
در تاریخ 1401/07/03 منتشر شده
است.
37,884
بـار بازدید شده