This seminar enhances the skills of the professional underhood technician in the area of Diesel Engine operation and Emissions controls. We will take a comprehensive look at the computer control systems used on a modern diesel equipped vehicle and draw correlations, as well as differences, to a gasoline engine’s operating strategy. We will discuss primary differences between the high pressure common rail diesel fuel system and a high pressure fuel system used on a gasoline direct injection turbocharged engine. Within this seminar we will review how modern diesel engines compare to their gasoline counterparts by differentiating the function and purpose of throttle control, fuel control, Mass Air Flow sensors, Exhaust Gas Recirculation (EGR) systems and reduction and oxidation catalysts. We will provide thorough understanding of the aftertreatment systems used in diesel applications which includes the DOC (Diesel Oxidation Catalyst), the NAC (NOx Adsorber Catalyst), the SCR (Selective Catalyst Reduction) and the DPF (Diesel Particulate Filter). Emphasis will be placed on maintenance and service needs compared to typical gasoline engine service as they pertain to fuel systems, coolant systems, transmission and engine oil, as well as all filtration systems. After completing this seminar, the student will have the knowledge to:

• Define and service light duty diesel truck emission’ systems

• Discuss Regeneration strategies and the role DEF plays within

• Evaluate NEW scan tool data PIDs used on many diesel applications as compared to gasoline vehicles.