In this design, when the system shuts down, the DEF just goes back to the tank by gravity and depressurizes over time, but every DEF pump I have seen recently indeed has a brushless DC motor. The other design I have seen (which seems to be common in many aftertreatment systems) is one having a pump without check valves. Depending on the model, some will have a pressure sensor built internally to monitor pressure and will have valves in the pump to redirect flow during a purge cycle. These electronic-controlled pumps need digital signals to work. These DEF pumps are not your average DC electric motors anymore (ones containing brushes/commutator that are energized through a switch). This method is much faster than doing all the resistance checks the manufacturer wants you to do on the harness, according to service information. In this article, I am going to show you how to diagnose a faulty DEF pump with a scope. We understand the theory of how the pump is supposed to work, but how do we diagnose a DEF pump problem? Within the chamber, a chemical reaction takes place, and the result is a reduction in oxides of nitrogen (NOx). They are used to supply pressurized fluid to the doser injector, so it can deliver the fluid in an atomized spray into the selective catalyst reduction (SCR) chamber. As everyone knows Diesel Exhaust Fluid (DEF) Pumps are now in use on every aftertreatment system out there today on the modern heavy-duty vehicle. The F650 and F750 use the 6 or 9 pin round connector interface.I think this month’s case study will have HD techs very interested. The F250s all the way to the F550s use the same OBII port computer system. Examples of trucks in this class include the International MXT, GMC 5500.

Examples of vehicles in this class include select Ford F-450 trucks and the GMC 4500.Ĭlass 5 truck gross vehicle weight rating (GVWR) ranges from 16,001 to 19,500 pounds (7,258 to 8,845 kg). The Hummer H1 is another example of a single rear wheel Class 3 truck, with a GVWR of 10,300 lbs.Ĭlass 4 truck gross vehicle weight rating (GVWR) ranges from 14,001 to 16,000 pounds (6,351 to 7,257 kg). Examples of vehicles in this class include the Dodge Ram 3500, Ford F-350 and the GMC Sierra 3500, both dual rear wheel and single rear wheel. The Class 3 truck gross vehicle weight rating (GVWR) ranges from 10,001 to 14,000 pounds (4,536 to 6,350 kg). Over 14.000 GVRW is considered to be medium duty trucks. Most F450s have a 13.500 gvrw which puts it into the light duty area but select few are over 14.000 as well as the F550. It covers all Superdutys including the F450 and the F550 with the 7.3, 6.0, 6.4L powerstroke. This is a top notch product and I use it on my 6.0L but I do need to make a correction with the last part of your statement.

Cummins insite 3 pin connector ram