5036500 JOHNSON *SCREW, STOP

Clean Gas Induction (CGI)
The CGI sends hot exhaust gas from the DPF to the CGI cooler. The hot exhaust gas is cooled in the CGI cooler. The now cooled exhaust gas passes through an electronic controlled flapper valve. The electronically controlled flapper valve is hydraulically actuated. The engine is using air from the truck's air filter system when the flapper valve is in the full OFF position. As the flapper valve starts to open the flow of cooled exhaust gas from the CGI cooler mixes with the air flow from the air filter. As the demand for more cooled exhaust gas increases the flapper valve opens wider. This increases the flow of cooled exhaust gas from the CGI cooler. As the demand for more cooled exhaust gas increases, the demand for air flow from the engine's air filter decreases.Diesel Particulate Filter (DPF)
The DPF and the Aftertreatment Regeneration Device (ARD) work together in order to reduce particulate emissions. The DPF collects the soot in the exhaust. The process of converting soot into gas is called regeneration. The ARD helps to accomplish this process when regeneration is required. Ash from the engine oil is also collected in the DPF.The DPF filters soot from the exhaust gas. If the temperature that is in the DPF is hot enough, the DPF converts the soot into gas. If the temperature that is in the DPF is not hot enough, the DPF retains the soot. When the soot must be removed from the DPF, the electronic control module will activate the ARD so that the soot can be oxidized into gas. Regeneration will be required more frequently when the engine is operated at extended idle and when the engine is operated in cold conditions. The DPF will need periodic cleaning of the accumulation of ash that occurs from the engine oil.Valve for Combustion Air
The valve for the combustion air controls the amount of boosted air that is used by the ARD for optimal operation.Aftertreatment Regeneration Device (ARD)
The temperature of the DPF must be above a particular value in order for regeneration to occur. The exhaust gas provides heat for the regeneration process. There are two types of regeneration:Passive Regeneration - The engine provides sufficient exhaust gas temperature for regeneration.Active Regeneration - The engine's duty cycle does not provide sufficient exhaust temperature for passive regeneration. The ARD operates in order to raise the temperature of the exhaust gas. When the regeneration process is complete, the ARD turns off.Fuel System
Illustration 1 g01378375
The fuel system schematic with ARD turned off. ARD fuel enable valve (13) is de-energized when the ARD is off. Manifold (2) and pressure sensor (3A) apply to C15 engines. Pressure sensor (3B) applies to C13 engines. (1) Fuel filter base (2) Manifold for the fuel pressure sensor on C15 engines (3A) Fuel pressure sensor on C15 engines (3B) Fuel pressure sensor on C13 engines (4) Cylinder head (5) 1034 kPa (150 psi) regulator (6) Fuel temperature sensor (7) Fluid sampling valve (8) Bypass for hand priming pump (9) (9) Optional hand priming pump (10) Secondary fuel filter (11) Air purge screw (12) 517 kPa (75 psi) regulator (13) ARD fuel enable valve (14) 689 kPa (100 psi) regulator (15) Return check valve (16) Fuel transfer pump (17) 2068 kPa (300 psi) regulator (18) ARD fuel manifold (19) Pilot fuel control solenoid (20) Pilot fuel pressure sensor (21) Manifold for the lines to the ARD (22) Wire mesh filter (23) ARD head (24) Main fuel control solenoid (25) Main fuel pressure sensor (26) Wire mesh filter (27) ARD purge air pump (28) 40 micron filter (29) Check valve (30) Cleaning port (31) Line for the purge air to the ARD head (32) Wire mesh filter (33) Primary fuel filter (34) Fuel tankThe fuel system provides the engine and the Aftertreatment Regeneration Device (ARD) with pressurized fuel. The cylinder head requires a fuel pressure of approximately 552 kPa (80 psi). The ARD requires a maximum fuel pressure of approximately 1586 kPa (230 psi). This procedure verifies that the fuel system can provide adequate fuel pressure for the cylinder head and for the ARD.The fuel system has two possible configurations. The following information describes each configuration.Fuel Supply
Refer to Illustration 1. The vehicle's fuel tank (34) provides fuel for cylinder head (4) and ARD head (23). Primary fuel filter (33) is a ten micron filter. All of the fuel for the cylinder head and for the ARD passes through the primary fuel filter.