I work for a very large truck leasing company.The scr (def and dpf combined) system is an industry nightmare.There are well over 1000 engine/emission fault codes that can arise on any modern truck, not counting the cab,abs, or trans ecms.The systems are very complex; even how the truck is driven has a bearing on the scr system(light load vs. heavy; stop&go vs.long haul). Diagnostics is very time consuming; you have nox codes:you have to test the purity of the def,there is inlet and outlet readings to compare,there is pressure and quanity tests to perform. There are problems with the pumps, the sensors and the ecms. Ecms have to be upgraded constantly to have the latest software installed as engineers replot operating parameters and strategies.Qualified techs are becoming scarce and tech support is overrun with problems. Jon f mn., I am very surprised you get away with distilled water; if you own that truck, carry a tote of def in your side box, you do not want to pay to have it fixed$$$. Also, what Bendon-Ks says is accurate, how the scr,(supplemental catalyst reduction)works. At our shop,at least 1 of 5 techs, sometimes 2 or 3, is almost always working on a truck with fault codes and many are scr,dpf related. The driver is part of the emissions system and has to 'obey' the warning lights=regen needed,def low,etc., or the truck will derate,in some cases 5 mph top speed, and have to be towed. 1 model, customers are bad about putting diesel in the def tank: then the tank has to be removed and cleaned ,lines flushed out,if run long enough, the nox sensors need replaced. Very expensive bill for customer$$$. I believe this emissions stuff is needed,oems would try to prove to epa if it was not.It's worldwide. It costs lots of $$$ to engineer,it costs lots to repair. The customer/consumer has to pay higher prices. Is it the best solution- I don't know-is something better coming - time will tell.Mark
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Today's Featured Article - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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